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Электронный компонент: U2797B

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TELEFUNKEN Semiconductors
U2797B
Rev. A1: 06.09.1995
1 (13)
1000-MHz Quadrature Modulator
Description
The IC U2797B is a 1000-MHz quadrature modulator that
uses TELEFUNKEN's advanced UHF process. It features
a frequency range from 100 MHz up to 1000 MHz, low
current consumption, and single-ended RF and LO ports.
The I/Q input impedance is about 150 k
W. Adjustment
free application makes the direct converter suitable for all
digital radio systems up to 1000 MHz, e.g., GSM,
DAMPS, PDC.
Features
D Supply voltage: 5 V (typical)
D Low power consumption: 30 mA / 5 V (typical at
1 dBm output level)
D 150 kW I/Q input impedance
D Excellent sideband suppression by means of duty
cycle regeneration of the LO input signal
D Phase control loop for precise 90
phase shifting
D Power down mode
D Low LO input level: 10 dBm (typical)
D 50-W single-ended LO and RF port
D LO- frequency range of 100 MHz to 1 GHz
D SSO 20 package
Benefits
D Extended talk time due to increased battery life
D Few external components result in cost and board
space saving
D Adjustment-free hence saves time
Block Diagram
Frequency
Duty cycle
regenerator
doubler
0
90
90 control
loop
M
Power
down
1
8
5,6
13
V
S
V
Ref
4
2, 3, 15, 16, 17, 18
GND
10
14
19
20
11
12
9
94 8185 e
BB
Ai
BB
Ai
LO
i
BB
BB
Bi
Bi
S
PD
RF
o
PD
Phase adj.
7
Ordeing Information
Extended Type Number
Package
Remarks
U2797B-AFS
SSO20
Rail, MOQ 830 pcs.
U2797B-AFSG3
SSO20
Tape & reel, MOQ 4000 pcs.
TELEFUNKEN Semiconductors
U2797B
Rev. A1: 06.09.1995
2 (13)
Pin Description
SSO 20
GND
1
2
3
4
5
6
7
8
10
9
19
18
17
16
14
15
13
12
11
20
PD
GND
GND
GND
GND
Ph
adj
RF
O
V
S
V
S
BB
Ai
BB
Ai
BB
Bi
BB
Bi
LO
i
Ph
adj
V
S
S
PD
V
REF
GND
94 8186 e
U2790BFS (SSO 20)
Pin
Symbol
Function
1
PD
Power down port
2
GND
Ground
3
GND
Ground
4
RF
o
RF output
5
V
S
Supply voltage
6
V
S
Supply voltage
7
V
S
Supply voltage
8
S
PD
Settling time power down
9
BB
Ai
Baseband input A
10
BB
Ai
Baseband input A inverse
11
BB
Bi
Baseband input B
12
BB
Bi
Baseband input B inverse
13
V
REF
Reference voltage (2.5 V)
14
LO
i
LO input
15
GND
Ground
16
GND
Ground
17
GND
Ground
18
GND
Ground
19/20
Ph
adj
Phase adjustment (not necessary for
regular applications)
Absolute Maximum Ratings
Parameters
Symbol
Value
Unit
Supply voltage
Pins 5, 6 and 7
V
S
6
V
Input voltage
Pins 9, 10, 11, 12, 14 and 15
V
i
0 to V
S
V
Junction temperature
T
j
125
C
Storage temperature range
T
stg
40 to + 125
C
Operating Range
Parameters
Symbol
Value
Unit
Supply voltage range
Pins 5, 6 and 7
V
S
4.5 to 5.5
V
Ambient temperature range
T
amb
40 to + 85
C
Thermal Resistance
Parameters
Symbol
Value
Unit
Junction ambient
SSO 20
R
thja
140
K/W
TELEFUNKEN Semiconductors
U2797B
Rev. A1: 06.09.1995
3 (13)
Electrical characteristics
Test conditions (unless otherwise specified): V
S
= 5 V, T
amb
= 25
C, referred to test circuit. System impedance
Z
O
= 50
W, f
LO
= 900 MHz, P
LO
= 10 dBm, V
BBi
= 1 V
pp
diff
Parameters
Test conditions / Pin
Symbol
Min.
Typ.
Max.
Unit
Supply voltage range
Pins 5, 6 and 7
V
S
4.5
5.5
V
Supply current
Pins 5, 6 and 7
I
S
30
mA
Baseband inputs
Pins 9-10, 1112
Input voltage range
(differential)
V
BBi
1000
1500
mV
pp
Input impedance
(single ended)
Z
BBi
150
k
W
Input frequency range
f
BBi
0
200
MHz
LO input
Pin 14
Frequency range
f
LOi
100
1000
MHz
Input level
1
P
LOi
12
10
5
dBm
Input impedance
Z
iLO
50
W
Voltage standing wave ratio
VSWR
LO
1.4
2
Duty cycle range
DCR
LO
0.4
0.6
RF output
Pin 4
Output level
P
RFo
5
1
dBm
LO suppression
2
f
LO
= 900 MHz
f
LO
= 150 MHz
LO
RFo
30
32
35
35
dB
Sideband suppression
2,3
f
LO
= 900 MHz
f
LO
= 150 MHz
SBS
RFo
35
30
40
35
dB
Phase error
4
P
e
< 1
deg.
Amplitude error
A
e
<
"0.25
dB
Noise floor
V
BBi
= 2 V, V
BBi
= 3 V
V
BBi
= V
BBi
= 2.5 V
N
FL
132
144
dBm/Hz
VSWR
VSWR
RF
1.6
2
3rd order baseband
harmonic suppression
S
BBH
35
45
dB
RF harmonic suppression
S
RFH
35
dB
Power down mode
Supply current
V
PD
x 0.5 V
Pins 4, 5
V
PD
= 1 V
I
PD
10
1
mA
Settling time
C
SPD
= 100 pF
C
LO
= 100 pF
C
RFo
= 1 nF
Pin 6 to 3
t
sPD
10
ms
Switching voltage
Pin 1
Power on
V
PDon
4
V
Power down
V
PDdown
1
V
Reference voltage
Pin 13
Voltage range
V
Ref
2.35
2.5
2.65
V
Output impedance
Z
o Ref
30
W
Note: 1 The required LO level is a function of the LO frequency
Note: 2 In reference to a RF output level
v 1 dBm and I/Q input level of 400 mV
pp
diff.
Note: 3 Sideband suppression is tested without connection at pins 19 and 20. For higher
requirements a potentiometer can be connected at these pins.
Note: 4 For T
amb
= 40 to + 85
C and V
S
= 4.5 to 5.5 V
TELEFUNKEN Semiconductors
U2797B
Rev. A1: 06.09.1995
4 (13)
Typical single sideband output spectrum
f
LO
= 900 MHz, P
LO
= 10 dBm, V
BBi
= 1 V
PP
(differential), T
amb
= 25
C
94 7856 e
Typical GMSK output spectrum
94 7855 e
TELEFUNKEN Semiconductors
U2797B
Rev. A1: 06.09.1995
5 (13)
Typical RF-harmonic output spectrum
94 7854 e
40
20
0
20
80
0
4
8
12
16
IP3 ( dBm )
Temperature (
C )
100
94 8884
V
BBi
= 0.4 V
PP
V
BBi
= 0.2 V
PP
40
60
OIP3 vs. T
amb
, LO = 150 MHz, level 20 dBm
94 8885
40
20
0
20
80
0
2
4
10
12
IP3 ( dBm )
Temperature (
C )
100
V
BBi
= 1.0 V
PP
V
BBi
= 0.4 V
PP
40
60
8
6
OIP3 vs. T
amb
, LO = 900 MHz, level 10 dBm