SL6679
Direct Conversion FSK Data Receiver
Preliminary Information
The SL6679 is an advanced Direct Conversion FSK Data
Receiver for operation up to 450 MHz. The device integrates all
functions to convert a binary FSK modulated RF signal into a
demodulated data stream.
Adjacent channel rejection is provided using tuneable gyrator
filters. RF and audio AGC functions assist operation when large
interfering signals are present and an automatic frequency control
(AFC) function is provided to extend centre frequency acceptance.
Supersedes September 1996 version, DS4410 - 1.5
DS4410 - 2.1 April 1998
Fig. 2 Block diagram of SL6679
-
+
-
+
10V
108V
4
f
DETECTOR
MIXER
LIMITER
AFC
LIMITER
MIX
DEC
BEC VCC1 VCC2 GND VREF
3
5
12
9 10 13
7
6 8
29
4
20
11
22
2
18
26
27
21
31
30
19
14
15 16 28
23 17
1
32
24 25
FEATURES
s
Very Low Power Operation from Single Cell
s
Superior Sensitivity
s
Operation at 512, 1200 and 2400 Baud
s
On Chip 1 Volt Regulator
s
1mm Height Miniature Package
s
Automatic Frequency Control Function
s
Programmable Post Detection Filter
s
AGC Detection Circuitry
s
Power Down Function
s
Battery Strength Indicator
APPLICATIONS
s
Pagers, including Credit Card, PCMCIA and
Watch Pagers
s
Low Data Rate Receivers, e.g. Security Systems
ORDERING INFORMATION
SL6679/KG/TP1N
1mm TQFP device, baked and dry
packed, supplied in trays
SL6679/KG/TP1Q
1mm TQFP device, baked and dry
packed, supplied in tape and reel
ABSOLUTE MAXIMUM RATINGS
Storage temperature
Operating temperature
Maximum voltage on any pin w.r.t. any
other pin, subject to the following conditions:
Current, pin 3 (MIXIP), pin 5 (MIXPB),
pin 12 (LOIPI) and pin 14 (LOIPB)
Most negative voltage on any pin
2
55
C to
1
150
C
2
10
C to
1
55
C
1
4V
<5ma
2
05V w.r.t. gnd
Fig. 1 Pin identification diagram (top view). See Table 1 for
pin descriptions
1
2
3
4
5
6
7
8
IRF
GND
MIXIP A
MIX DEC
MIXIP B
REG CNT
VREG
TPI
9 10 11 12 13 14 15 16
32 31 30 29 28 27 26 25
24
23
22
21
20
19
18
17
AFC1
BATT FLAG
VCC2
DATA OP
BEC
AFC OP
VREF
TPQ
I1
I2
V
CC
1
LOIP
I
GYR I
LOIP
Q
Q1
Q2
GTH ADJ
TC ADJ
IAGC OP
TP
LIM I
V
BA
TT
BRF1
BRF CNT
AFC2
TP32
SL6679
2
SL6679
Pin number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Pin name
IRF
GND
MIXIP A
MIX DEC
MIXIP B
REG CNT
VREG
TPI
I1
I2
VCC1
LOIP I
GYRI
LOIP Q
Q1
Q2
TPQ
VREF
AFC OP
BEC
DATA OP
VCC2
BATT FLAG
AFC1
AFC2
BRF CNT
BRF1
VBATT
TP LIM I
IAGC OP
TC ADJ
GTH ADJ
LNA current source
Ground
Mixer input A
Mixer biasing decouple
Mixer input B
1V regulator control external PNP drive
1V regulator output voltage
I channel pre-gyrator filter test point.
Mixer output, I channel
Mixer output, I channel
Positive supply 1
LO input channel I
Gyrator current adjust pin
LO input channel Q
Mixer output, Q channel
Mixer output, Q channel
Q channel pre-gyrator filter test point
Reference voltage
AFC output
Battery economy control
Data output pin
Positive supply 2
Battery flag output
AFC characteristic defining pin
AFC characteristic defining pin
Bit rate filter control
Bit rate filter 1, output from detector
Battery flag input voltage
I channel limiter (post gyrator filter) test point, output only
Audio AGC output current
Audio AGC time constant adjust
Audio AGC gain and threshold adjust. RSSI signal indicator
Pin description
Table 1 SL6679 pin descriptions
3
SL6679
ELECTRICAL CHARACTERISTICS (1)
Electrical Characteristics (1) are guaranteed over the following range of operating conditions unless otherwise stated
T
AMB
=
1
25
C, V
CC
1 = 13V, V
CC
2 = 27V
095
19
120
260
095
025
375
115
25
7:9
V
CC
2
2
03V
0
2
10
2
10
104
10
25
2
10
2
10
Characteristic
Value
Typ.
Max.
Min.
V
CC
1
<
V
CC
2
2
08V
Including IRF
I
LOAD
= 3mA, external PNP(
b>
100, V
CE
= 01V)
External PNP (h
FE
>
100, V
CE
= 01V)
PTAT, voltage on pin 1 = 03V and 13V
Typical temperature coefficient =
1
01mV/
C
Output logic low, pin 21 voltage = 03V
Output logic high, pin 21 voltage = V
CC
2
Preamble at 1200 baud,
D
f = 4kHz,
pin 26 = 0V, BRF capacitor = 560pF,
DATA OP pullup resistor = 200k
Pin 20 = logic low
Pin 20 = logic low
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Current sunk by pin 23 = 1
A
Pin 28 voltage = 104V
Pin 28 voltage = 112V
Pin 28 voltage = 114V
V
BATT
= 114V
V
BATT
= 104V
V
V
mA
A
V
mA
A
V
A
A
A
A
A
A
V
V
A
A
V
A
A
A
V
A
A
27
35
22
490
105
3
700
131
20
10
10
9:7
10
10
V
CC
2
03
10
10
112
10
20
10
10
13
27
160
390
10
500
125
05
20
108
Conditions
Units
Supply voltage, V
CC
1
Supply voltage, V
CC
2
Supply current, I
CC
1
Supply current, I
CC
2
1 volt regulator, V
REG
1 volt regulator load current
LNA current source, IRF
Reference voltage, V
REF
V
REF
source current
V
REF
sink current
Data Amplifier
DATA OP sink current
DATA OP leakage current
Output mark:space ratio
Battery Economy
Power down I
CC
1
Power down I
CC
2
BEC input logic high
BEC input logic low
BEC input current
BEC input current
Battery Flag
V
BATT
trigger point
BATT FLAG sink current
BATT FLAG sink current
BATT FLAG sink current
V
BATT
input voltage
V
BATT
input current
V
BATT
input current
Pin
11
22
11
22
7
7
1
18
18
18
21
21
21
11
22
20
20
20
20
28
23
23
23
28
28
28
Continued...
4
SL6679
ELECTRICAL CHARACTERISTICS (1) (Cont.)
Electrical Characteristics (1) are guaranteed over the following range of operating conditions unless otherwise stated
T
AMB
=
1
25
C, V
CC
1 = 13V, V
CC
2 = 27V
Characteristic
Value
Typ.
Min.
LO inputs (12, 14) driven in quadrature:
45mVrms at 450MHz, CW.
Mixer inputs (3, 5) driven differentially:
045mVrms at 450004MHz, CW.
As gain to TPI
As gain toTPI
TPI, TPQ signals limiting
No signal applied
f
C
= f
LO
1
45kHz, CW
f
C
= f
LO
1
25kHz, CW
f
C
= f
LO
1
65kHz, CW
2400 baud
1200 baud
512 baud
Pin 26 logic high
Pin 26 logic low
Pin 26 logic tristate (open circuit)
V
CC
1
42
42
0
45
00
I
AFC4k5
1
07
I
AFC4k5
2
09
35
17
074
Conditions
Mixers
LO DC bias voltage
Gain to TPI
Gain to TPQ
Match of gain to TPI
and TPQ
Audio AGC
IAGC OP max. sink current
IAGC OP leakage current
AFC
AFC DC current, I
AFC4k5
AFC DC current
AFC DC current
Bit Rate Filter Control
BRF CNT input logic high
BRF CNT input logic low
Tristate I/P current window
BRF 1 output current
BRF 1 output current
BRF 1 output current
BRF CNT input high current
BRF CNT input low current
Pin
12,14
3,5,8,12
3,5,14,
17
3,5,8,
12,14,17
30
30
19
19
19
26
26
26
27
27
27
26
26
38
38
2
1
I
AFC4k5
1
02
V
CC
2
2
03
0
2
04
2
75
2
75
Max.
46
46
1
1
1
I
AFC4k5
2
02
V
CC
2
01
1
04
1
15
1
75
V
dB
dB
dB
A
A
A
A
A
V
V
A
A
A
A
A
A
Units
5
SL6679
ELECTRICAL CHARACTERISTICS (2)
Electrical Characteristics (2) are guaranteed over the following range of operating conditions unless otherwise stated.
Characteristics are tested at room temperature only and are guaranteed by characterisation test or design.
T
AMB
=
2
10
C to
1
55
C, V
CC
1 = 14V to 20V, V
CC
2 = 23V to 32V. V
CC
1
,
V
CC
2
2
08V
095
19
093
025
375
113
22
7:9
V
CC
2
2
03V
0
2
15
2
15
104
2
20
2
15
2
15
Characteristic
Value
Typ.
Max.
Min.
V
CC
1
<
V
CC
2
2
08V at
>
25
C only
Including IRF
I
LOAD
= 3mA, external PNP(
b>
100, V
CE
= 01V)
External PNP(h
FE
>
100, V
CE
= 01V)
PTAT, voltage on pin 1 = 03V and 13V
Typical temperature coefficient =
1
01mV/
C
Stable data O/P when 3dB above sensitivity.
C
VREF
= 22
F
Fall to 10% of steady state I
CC
1. C
VREF
= 22
F
Output logic low, pin 21 voltage = 03V
Output logic high, pin 21 voltage = V
CC
2
Preamble at 1200 baud,
D
f = 4kHz,
pin 26 = 0V, BRF capacitor = 560pF,
DATA OP pullup resistor = 200k
Pin 20 = logic low
Pin 20 = logic low
Powered up
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Current sunk by pin 23 = 1
A
Pin 28 voltage = 104V
Pin 28 voltage = 112V
Pin 28 voltage = 114V
V
BATT
= 114V
V
BATT
= 104V
V
V
mA
A
V
mA
A
V
A
A
ms
ms
A
A
A
A
V
V
A
A
V
A
A
A
V
A
A
27
35
24
510
105
3
800
133
18
08
15
9:7
12
12
V
CC
2
03
15
15
112
2
20
15
15
13
27
160
350
10
500
125
9
2
05
20
108
Conditions
Units
Supply voltage, V
CC
1
Supply voltage, V
CC
2
Supply current, I
CC
1
Supply current, I
CC
2
1 volt regulator, V
REG
1 volt regulator load current
LNA current source, IRF
Reference voltage, V
REF
V
REF
source current
V
REF
sink current
Turn-on time
Turn-off time
Data Amplifier
DATA OP sink current
DATA OP leakage current
Output mark:space ratio
Battery Economy
Power down I
CC
1
Power down I
CC
2
BEC input logic high
BEC input logic low
BEC input current
BEC input current
Battery Flag
V
BATT
trigger point
BATT FLAG sink current
BATT FLAG sink current
BATT FLAG sink current
V
BATT
input voltage
V
BATT
input current
V
BATT
input current
Pin
11
22
11
22
7
7
1
18
18
18
21
21
21
11
22
20
20
20
20
28
23
23
23
28
28
28
Continued...
6
SL6679
ELECTRICAL CHARACTERISTICS (2) (Cont.)
Electrical Characteristics (2) are guaranteed over the following range of operating conditions unless otherwise stated.
Characteristics are tested at room temperature only and are guaranteed by characterisation test or design.
T
AMB
=
2
10
C to
1
55
C, V
CC
1 = 14V to 20V, V
CC
2 = 23V to 32V. V
CC
1
,
V
CC
2
2
08V
Characteristic
Value
Typ.
Min.
LO inputs (12, 14) driven in quadrature:
45mVrms at 450MHz, CW.
Mixer inputs (3, 5) driven differentially:
045mVrms at 450004MHz, CW.
As gain to TPI
As gain toTPI
TPI, TPQ signals limiting
No signal applied
f
C
= f
LO
1
45kHz, CW
f
C
= f
LO
1
25kHz, CW
f
C
= f
LO
1
65kHz, CW
2400 baud
1200 baud
512 baud
Pin 26 logic high
Pin 26 logic low
Pin 26 logic tristate (open circuit)
V
CC
1
42
42
0
45
00
I
AFC4k5
1
07
I
AFC4k5
2
09
35
17
074
Conditions
Mixers
LO DC bias voltage
Gain to TPI
Gain to TPQ
Match of gain to TPI
and TPQ
Audio AGC
IAGC OP max. sink current
IAGC OP leakage current
AFC
AFC DC current, I
AFC4k5
AFC DC current
AFC DC current
Bit Rate Filter Control
BRF CNT input logic high
BRF CNT input logic low
Tristate I/P current window
BRF 1 output current
BRF 1 output current
BRF 1 output current
BRF CNT input high current
BRF CNT input low current
Pin
12,14
3,5,8,12
3,5,14,
17
3,5,8,
12,14,17
30
30
19
19
19
26
26
26
27
27
27
26
26
35
35
2
15
30
I
AFC4k5
1
01
V
CC
2
2
03
0
2
04
2
10
2
10
Max.
46
46
1
15
70
1
I
AFC4k5
2
01
V
CC
2
01
1
04
1
10
1
10
V
dB
dB
dB
A
A
A
A
A
V
V
A
A
A
A
A
A
Units
7
SL6679
RECEIVER CHARACTERISTICS (450MHz)
Receiver Characteristics (450MHz) are guaranteed over the following range of operating conditions unless otherwise stated.
Characteristics are not tested but are guaranteed by characterisation test or design. All measurements made using the
characterisation circuit Fig. 5. See Application Note AN137 for details of test method.
T
AMB
=
2
10
C to
1
55
C, V
CC
1 = 104V to 20V, V
CC
2 = 23V to 32V, V
CC
1
,
V
CC
2
2
08V, carrier frequency = 450MHz,
BER = 1 in 30, AFC open loop. LNA gain set such that an RF signal of
2
73dBm at the LNA input, offset from the LO
by 4kHz, gives a typical IF signal level of 300mV p-p at TPI and TPQ. LNA noise figure
,
2dB
Characteristic
512bps,
D
f = 45kHz
1200bps,
D
f = 40kHz
2400bps,
D
f = 45kHz. LO =
2
15dBm
512bps,
D
f = 45kHz
1200bps,
D
f = 40kHz
2400bps,
D
f = 45kHz. LO =
2
15dBm. Channel
spacing 25kHz
512bps,
D
f = 45kHz
1200bps,
D
f = 40kHz
2400bps,
D
f = 45kHz. LO =
2
15dBm. Channel
spacing 25kHz
512bps,
D
f = 45kHz, no AFC
512bps,
D
f = 45kHz, no AFC
1200bps,
D
f = 40kHz, no AFC
1200bps,
D
f = 40kHz, no AFC
2400bps,
D
f = 45kHz, no AFC
2400bps,
D
f = 45kHz, no AFC
512bps,
D
f = 45kHz, no AFC
1200bps,
D
f = 40kHz, no AFC
2400bps,
D
f = 45kHz, no AFC
512bps,
D
f = 45kHz. All at sensitivity
1
3dB or above
1200bps,
D
f = 40kHz. All at sensitivity
1
3dB or above
2400bps,
D
f = 45kHz. All at sensitivity
1
3dB or above
Conditions
Sensitivity
Intermodulation, IP3
Adjacent Channel
Deviation Acceptance
Up
Down
Up
Down
Up
Down
Centre Frequency Acceptance
AFC Capture Range (AFC
Closed Loop)
Value
Typ.
Min.
2
128
2
126
2
123
57
55
53
70
69
66
1
19
2
25
1
30
2
23
1
25
2
23
6
28
6
25
6
25
6
4
6
35
6
4
50
48
625
60
1
18
2
27
1
17
2
3
6
20
6
20
Max.
dBm
dBm
dBm
dB
dB
dB
dB
dB
dB
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
Units
2
122
2
119
1
46
2
17
1
46
2
17
6
29
6
32
8
SL6679
RECEIVER CHARACTERISTICS (280MHz)
Receiver Characteristics (280MHz) are guaranteed over the following range of operating conditions unless otherwise stated.
Characteristics are not tested but are guaranteed by characterisation test or design. All measurements made using the
characterisation circuit Fig. 5. See Application Note AN137 for details of test method.
T
AMB
=
2
10
C to
1
55
C, V
CC
1 = 104V to 20V, V
CC
2 = 23V to 32V, V
CC
1
,
V
CC
2
2
08V, carrier frequency = 280MHz,
BER = 1 in 30, AFC open loop. LNA gain set such that an RF signal of
2
73dBm at the LNA input, offset from the LO
by 4kHz, gives a typical IF signal level of 300mV p-p at TPI and TPQ. LNA noise figure
,
2dB
Characteristic
512bps,
D
f = 45kHz
1200bps,
D
f = 40kHz
2400bps,
D
f = 45kHz. LO =
2
15dBm
512bps,
D
f = 45kHz
1200bps,
D
f = 40kHz
2400bps,
D
f = 45kHz. LO =
2
15dBm. Channel
spacing 25kHz
512bps,
D
f = 45kHz
1200bps,
D
f = 40kHz
2400bps,
D
f = 45kHz. LO =
2
15dBm. Channel
spacing 25kHz
512bps,
D
f = 45kHz, no AFC
512bps,
D
f = 45kHz, no AFC
1200bps,
D
f = 40kHz, no AFC
1200bps,
D
f = 40kHz, no AFC
2400bps,
D
f = 45kHz, no AFC
2400bps,
D
f = 45kHz, no AFC
512bps,
D
f = 45kHz, no AFC
1200bps,
D
f = 40kHz, no AFC
2400bps,
D
f = 45kHz, no AFC
512bps,
D
f = 45kHz. All at sensitivity
1
3dB or above
1200bps,
D
f = 40kHz. All at sensitivity
1
3dB or above
2400bps,
D
f = 45kHz. All at sensitivity
1
3dB or above
512bps,
D
f = 45kHz
1200bps,
D
f = 40kHz
2400bps,
D
f = 45kHz. LO =
2
15dBm
2400bps, R14 = 120k
(Fig. 5), room temperature
only. See Note.
Conditions
Sensitivity
Intermodulation, IP3
Adjacent Channel
Deviation Acceptance
Up
Down
Up
Down
Up
Down
Centre Frequency Acceptance
AFC Capture Range (AFC
Closed Loop)
1MHz Blocking
Mark:space amplitude
modulation acceptance
Value
Typ.
Min.
2
129
2
127
2
124
57
56
535
72
69
60
1
19
2
25
1
30
2
29
1
25
2
23
6
31
6
29
6
25
6
4
6
35
6
4
75
75
73
23
2
128
2
127
52
49
625
60
1
18
2
38
1
17
2
30
6
20
6
20
67
65
20
Max.
dBm
dBm
dBm
dB
dB
dB
dB
dB
dB
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
dB
dB
dB
dB
Units
2
124
2
121
60
57
80
77
1
46
2
17
1
46
2
17
6
31
6
32
78
76
NOTE
The mark:space amplitude acceptance is the maximum amplitude ratio which can occur (for example due to Simulcast conditions) with 2400bps,
using a POCSAG decoder with R14 = 120k
to achieve an 80% call rate and the lower amplitude set at a sensitivity of
1
20dB. the maxima and
minima of the amplitude modulation correspond to the positive and negative (or vice versa) frequency shifts of the FSK modulation.
9
SL6679
OPERATION OF SL6679
Low Noise Amplifier
To achieve optimum performance it is necessary to incor-
porate a Low Noise RF Amplifier at the front end of the
receiver. This is easily biased using the on-chip voltages and
current source provided. All voltages and current sources
used for bias of the RF amplifier, receiver and mixers should
be RF decoupled using 1nF capacitors. The receiver also
requires a stable Local Oscillator at the required channel
frequency.
Local Oscillator
The Local Oscillator signal is applied to the device in
phase quadrature. This can be achieved with the use of two
RC networks operating at their
2
3dB/45
transfer character-
istic. The RC characteristics for I and Q channels are com-
bined to give a full 90
phase differential between the LO ports
of the device. Each LO port also requires an equal level of
drive from the oscillator. This is achieved by forming the two
RC networks into a power divider.
Gyrator Filters
The on-chip filters include an adjustable gyrator filter. This
may be adjusted by changing the value of the resistor con-
nected between pin 13 and GND. This allows adjustment of
the filters' cutoff frequency and allows for compensation for
possible process variations.
Audio AGC (Fig. 3)
The Audio AGC consists of a current sink which is control-
led by the audio (baseband) signal. It has three parameters
that may be controlled by the user. These are the attack (turn
on ) time, decay (duration) time and threshold level. The
attack time is simply determined by the value of the external
capacitor connected to TCADJ. The external capacitor is in
series with an internal 100k
resistor and the time constant
of this circuit dictates the attack time of the AGC.
i.e. t
ATTACK
= 100k
3
C18
The decay time is determined by the external resistor
connected in parallel with the capacitor CTC. The decay time
is simply
t
DECAY
= R17
3
C18
When a large audio (baseband) signal is incident on the
input to the AGC circuit, the variable current source is turned
on. This causes a voltage drop across R13. The voltage
potential between V
REF
and the voltage on pin 31 causes a
current to flow in pin 30. This charges up C18 through the
100k
internal resistor. As the voltage across the capacitor
increases, a current source is turned on and this sinks current
from pin 32. The current sink on pin 32 can be used to drive
the external AGC circuit by causing a PIN diode to conduct,
reducing the signal to the RF amplifier.
RF AGC
The RF AGC is an automatic gain control loop that
protects the mixer's RF inputs, Pins 3 and 5, from large out of
band RF signals. The loop consists of an RF received signal
strength indicator which detect the signal at the inputs of the
mixers. This RSSI signal is then used to control the LNA
current source (pin 1).
Regulator
The on-chip regulator should be used in conjunction with
a suitable PNP transistor to achieve regulation. As the transis-
tor forms part of the regulator feedback loop the transistor
should exhibit the following characteristics:
H
FE
.
100 for V
CE
.
= 01V
If no external transistor is used, the maximum current
sourcing capability of the regulator is limited to 30
A.
Automatic Frequency Control (Fig. 4)
The Automatic Frequency Control consists of a detection
circuit which gives a current output at AFC OP whose magni-
tude and sign is a function of the difference between the local
oscillator (f
LO
) and carrier frequencies (f
C
). This output current
is then filtered by an off-chip integrating capacitor. The
integrator's output voltage is used to control a voltage control
crystal oscillator. This closes the AFC feedback loop giving
the automatic frequency control function. For an FSK modu-
lated incoming RF carrier, the AFC OP current's polarity is
positive, i.e.current is sourced for f
LO
,
f
C
,
f
LO
1
4kHz and
negative, i.e. current is sunk, for f
LO
.
f
C
.
f
LO
2
4kHz. The
magnitude of the AFC OP current is a function of frequency
offset and the transmitted data's bit stream. If the carrier
frequency, (f
C
), equals the local oscillator frequency, (f
LO
)
then the magnitude of the current is zero.
BIT RATE FILTER CONTROL
The logic level on pin 26 controls the cutoff frequency of
the 1st order bit rate for a given bit rate filter capacitor at pin
27. This allows the cutoff frequency to be changed between
f
C
, 2f
C
and 043f
C
through the logic level on pin 26. This
function is achieved by changing the value of the current in the
4
f
detector's output stage. A logic zero (0V to 01V) on pin 26
gives a cutoff frequency of f
C
a logic one (V
CC
2
2
03V to V
CC
2)
gives a cut off frequency of 2f
C
and an open circuit at pin 26
gives a cutoff frequency of 043f
C
.
10
SL6679
35
4
45
5
55
512, 1200, 2400
512, 1200, 2400
512, 1200, 2400
512, 1200, 2400
512, 1200, 2400
750pF
560pF
510pF
470pF
430pF
20nF
15nF
13nF
12nF
11nF
15k
15k
15k
15k
15k
C22
C21
R11
Component (Fig. 4)
Peak deviation
(kHz)
Baud rate
(bps)
Table 2 AFC defining components
Fig. 4 AFC schematic
Fig.3 AGC schematic
-
+
-
+
R13
C34
V
REF
R17
R
DECAY
C18
C
TC
V
REF
CURRENT
SOURCE 1
V
CC
V
REF
1
5mV
32
31
30
100k
V
CC
1
RF
INPUT
TO RF AMP
VOLTAGE
REFERENCE
V
CC
2
0
A/5
A
5
A/0
A
AFC
DETECTION
CIRCUIT
C15
C
INT
1
C30
C
INT
2
V
CC
2
C
VREF
R15
320k
TO VCXO
VARACTOR
DIODE
18
19
24
25
V
CC
1
R11
C21
C22
SL6679
SL6679
11
SL6679
Fig. 5 SL6679 characterisation circuit (see Tables 3 and 4 for component values)
SL6679
1
2
3
4
5
6
7
8
IRF
GND
MIXIP
A
MIX DEC
MIXIP
B
REG CNT
V
REG
TPI
9
1
0
1
1
1
21
3
1
41
5
1
6
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
AFC1
BA
TT FLAG
V
CC
2
DA
T
A
OP
BEC
AFC OP
V
REF
TPQ
I1
I2
V
CC
1
LOIP I
GYR I
LOIP Q
Q1
Q2
GTH ADJ
TC ADJ
IAGC OP
TP LIM I
VBATT
BRF1
BRF CNT
AFC2
V
CC
1
R13
R17
C18
V
CC
1
C34
V
REF
V
CC
1
TP
LIM I
BRF CNT
C27
R10
C22
R1
1
C21
C23
C24
C16
C17
V
CC
1
V
CC
2
V
CC
1
V
CC
2
R9
R8
DA
T
A
OP
BEC
AFC OP
V
REF
C15
C30
R15
R16
C19
C20
T
O
TR2
C25
C26
V
CC
1
TR3
C6
C33
V
CC
1
T1
VC1
R3
C5
C8
FROM
IRF
(PIN 1)
R2
C7
V
REF
C4
V
REG
R1
C3
TR1
TR2
C2
C1
L1
RF IN
R12
C28
V
REG
V
REG
C9
C10
R14
C12
EXT
LO
C1
1
R4
R6
C13
C6
C33
C32
C29
V
CC
1
R7
R5
C14
R18
12
SL6679
Resistors
Capacitors
Capacitors (cont.)
Inductors
L1
56nH
T1
30nH 1:1, Coilcraft M1686-A
Transistors
TR1
Toshiba 2SC5065
TR2
Toshiba 2SC5065
TR3
FMMT589 (Zetex ZTX550)
R1
47k
R2
47k
R3
15k
R4
100
R5
100
R6
100
R7
100
R8
430k
R9
220k
R10
S/C
R11
15k
R12
2k
R13
39k
R14
180k
R15
430k
R16
220k
R17
220k
R18
33M
C1
12pF
C2
O/C
C3
220nF
C4
1nF
C5
1nF
C6
1nF
C7
1nF
C8
33pF
C9
47nF
C10
47nF
C11
47pF
C12
56pF
C13
1nF
C14
1nF
C15
1nF
C16
1nF
C17
22
F
C18
100nF
C19
1nF
C20
22
F
C21
15nF
C22
560pF
C23
1nF
C24
22
F
C25
100nF
C26
100nF
C27
560pF
C28
1nF
C29
1nF
C30
1nF
C32
100nF
C33
100nF
C34
100nF
VC1
3-10pF
Table 3 Component list for 280MHz characterisation board
Resistors
Capacitors
Capacitors (cont.)
Inductors
L1
47nH
T1
16nH 1:1, Coilcraft Q4123-A
Transistors
TR1
Philips BFT25A
TR2
Philips BFT25A
TR3
FMMT589 (Zetex ZTX550)
R1
47k
R2
47k
R3
15k
R4
100
R5
100
R6
100
R7
100
R8
430k
R9
220k
R10
S/C
R11
15k
R12
2k
R13
39k
R14
180k
R15
430k
R16
220k
R17
220k
R18
3.3M
C1
O/C
C2
O/C
C3
1nF
C4
1nF
C5
1nF
C6
1nF
C7
1nF
C8
33pF
C9
47nF
C10
47nF
C11
39pF
C12
33pF
C13
1nF
C14
1nF
C15
1nF
C16
1nF
C17
22
F
C18
100nF
C19
1nF
C20
22
F
C21
15nF
C22
560pF
C23
1nF
C24
22
F
C25
100nF
C26
100nF
C27
560pF
C28
1nF
C29
1nF
C30
1nF
C32
100nF
C33
100nF
C34
100nF
VC1
3-10pF
Table 4 Component list for 450MHz characterisation board
13
SL6679
Fig. 6b Typical I
CC
2
Fig. 6a Typical I
CC
1
Conditions
Standard Mitel characterisation board (Fig. 5)
I
CC
1 includes IRF LNA current (typ. 500
A) but does not include the regulator load current
The Audio AGC and RF AGC are both inactive
I
CC
2 is measured with BATTFLAG and DATAS OP high, f
C
= 282MHz
V
BATT
connected to V
CC
1
Fig. 6 Typical I
CC
1 and I
CC
2 v. supply and temperature
TYPICAL DC PARAMETERS (FIGS. 6 TO 8)
2
40
2
20
0
20
40
60
80
055
05
045
04
035
03
025
02
015
01
005
TEMPERATURE
C
I
CC
2 (mA)
V
CC
= 30, 40
V
CC
= 13, 27
V
CC
= 10, 19
2
40
2
20
0
20
40
60
80
22
2
18
16
14
12
1
08
06
04
02
TEMPERATURE
C
I
CC
1 (mA)
V
CC
= 30, 40
V
CC
= 13, 27
V
CC
= 10, 19
14
SL6679
Fig. 7a Typical V
REF
Conditions
Standard Mitel characterisation board (Fig. 5)
I
CC
1 includes IRF LNA current (typ. 500
A) but does not include the regulator load current
The Audio AGC and RF AGC are both inactive
I
CC
2 is measured with BATTFLAG and DATAS OP high, f
C
= 282MHz
V
BATT
connected to V
CC
1
Fig. 7 Typical V
REF
and V
REG
v. supply and temperature
2
40
2
20
0
20
40
60
80
130
128
126
124
122
TEMPERATURE
C
V
REF
(V)
V
CC
= 30, 40
V
CC
= 13, 27
V
CC
= 10, 19
2
40
2
20
0
20
40
60
80
105
103
101
099
097
TEMPERATURE
C
V
REG
(V)
V
CC
= 30, 40
V
CC
= 13, 27
V
CC
= 10, 19
Fig. 7b Typical V
REG
(load = 22k
to GND)
15
SL6679
Fig. 8a Typical IRF (V
IRF
= 03V)
Conditions
Standard Mitel characterisation board (Fig. 5)
I
CC
1 includes IRF LNA current (typ. 500
A) but does not include the regulator load current
The Audio AGC and RF AGC are both inactive
I
CC
2 is measured with BATTFLAG and DATAS OP high, f
C
= 282MHz
V
BATT
connected to V
CC
1
Fig. 8 Typical I
RF
v. supply and temperature
2
40
2
20
0
20
40
60
80
700
600
500
400
300
200
100
TEMPERATURE
C
I
RF
(
A)
V
CC
= 30, 40
V
CC
= 13, 27
V
CC
= 10, 19
2
40
2
20
0
20
40
60
80
700
600
500
400
300
200
100
TEMPERATURE
C
I
RF
(
A)
V
CC
= 30, 40
V
CC
= 13, 27
V
CC
= 10, 19
Fig. 8b Typical IRF (V
IRF
= 13V)
16
SL6679
2
40
2
20
0
20
40
60
80
11
108
106
104
TEMPERATURE
C
V
BA
TT
TRIGGER VOL
T
AGE (V)
V
CC
= 27
V
CC
= 23
V
CC
= 19
V
CC
= 35
Conditions
Standard Mitel characterisation board (Fig. 5)
I
CC
1 includes IRF LNA current (typ. 500
A) but does not include the regulator load current
The Audio AGC and RF AGC are both inactive
I
CC
2 is measured with BATTFLAG and DATAS OP high, f
C
= 282MHz
V
BATT
connected to V
CC
1
Fig. 9 Typical battery flag trigger voltage (V
BATTFLAG
= V
CC
/2) v. supply and temperature
2
40
2
20
0
20
40
60
80
2
12400
2
12600
2
12800
2
13000
TEMPERATURE
C
SENSITIVITY
(1 IN 30 BER) (dBm)
V
CC
= 30, 40
V
CC
= 13, 27
V
CC
= 10, 19
TYPICAL AC PARAMETERS (FIGS. 10 TO 13)
Conditions
282 Mitel characterisation board (Fig. 5), f
C
= 282MHz
1200bps baud rate, 4kHz peak deviation frequency, BER 1 in 30
The LNA gain is set such that an RF signal of
2
73dBm at the LNA input, offset from the LO by 4kHz, gives a typical signal
level of 300mVp-p at TPI and TPQ
Fig. 10 Typical sensitivity v. supply and temperature
17
SL6679
Fig. 11a Typical IP3
Fig. 11b Typical adjacent channel
2
40
2
20
0
20
40
60
80
60
58
56
54
52
TEMPERATURE
C
IP3(dB)
V
CC
= 30, 40
V
CC
= 13, 27
V
CC
= 10, 19
Conditions
282 Mitel characterisation board (Fig. 5), f
C
= 282MHz
1200bps baud rate, 4kHz peak deviation frequency, BER 1 in 30
The LNA gain is set such that an RF signal of
2
73dBm at the LNA input, offset from the LO by 4kHz, gives a typical signal
level of 300mVp-p at TPI and TPQ
Fig. 11 Typical IP3 and adjacent channel v. supply and temperature
2
40
2
20
0
20
40
60
80
69
685
68
675
67
665
TEMPERATURE
C
CENTRE FREQUENCY
ACCEPT
ANCE (kHz)
V
CC
= 30, 40
V
CC
= 13, 27
V
CC
= 10, 19
18
SL6679
Conditions
282 Mitel characterisation board (Fig. 5), f
C
= 282MHz
1200bps baud rate, 4kHz peak deviation frequency, BER 1 in 30
The LNA gain is set such that an RF signal of
2
73dBm at the LNA input, offset from the LO by 4kHz, gives a typical signal
level of 300mVp-p at TPI and TPQ
Fig. 12 Typical deviation acceptance v. supply and temperature
2
40
2
20
0
20
40
60
80
40
35
30
25
TEMPERATURE
C
DEVIA
TION
ACCEPT
ANCE UP
(kHz)
V
CC
= 30, 40
V
CC
= 13, 27
V
CC
= 10, 19
Fig. 12a Typial deviation acceptance UP
Fig 12b Typical deviation acceptance DOWN
2
40
2
20
0
20
40
60
80
307
302
297
292
287
TEMPERATURE
C
DEVIA
TION
ACCEPT
ANCE DOWN (kHz)
V
CC
= 30, 40
V
CC
= 13, 27
V
CC
= 10, 19
19
SL6679
Conditions
282 Mitel characterisation board (Fig. 5), f
C
= 282MHz
1200bps baud rate, 4kHz peak deviation frequency, BER 1 in 30
The LNA gain is set such that an RF signal of
2
73dBm at the LNA input, offset from the LO by 4kHz, gives a typical signal
level of 300mVp-p at TPI and TPQ
Fig. 13 Typical centre frequency acceptance and 1MHz blocking v. supply and temperature
Fig. 13a Typical centre frequency acceptance
Fig. 13b Typical1MHz blocking
2
40
2
20
0
20
40
60
80
80
79
78
77
76
75
74
73
72
71
TEMPERATURE
C
1MHz BLOCKING ( dB)
V
CC
= 30, 40
V
CC
= 13, 27
V
CC
= 10, 19
2
40
2
20
0
20
40
60
80
315
31
305
3
295
29
285
TEMPERATURE
C
CENTRE FREQUENCY
ACCEPT
ANCE (kHz)
V
CC
= 30, 40
V
CC
= 13, 27
V
CC
= 10, 19
M Mitel (design) and ST-BUS are registered trademarks of MITEL Corporation
Mitel Semiconductor is an ISO 9001 Registered Company
Copyright 1999 MITEL Corporation
All Rights Reserved
Printed in CANADA
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liability for errors that may appear in this publication, or for liability otherwise arising from the application or use of any such information, product or service or for any infringement of
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