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BIPOLAR ANALOG INTEGRATED CIRCUIT
PC1686G/GV
GENERAL PURPOSE 5 V FREQUENCY DOWN-CONVERTER IC
Document No. P11100EJ4V0DS00 (4th edition)
Date Published October 1999 N CP(K)
Printed in Japan
DATA SHEET
The mark
shows major revised points.
1996, 1999
DESCRIPTION
The
PC1686 is Silicon monolithic IC designed for VHF band receiver applications. This IC consists of double
balanced mixer, local oscillator, IF amplifier, and voltage regulator.
The package is 8-pin SOP or SSOP suitable for high-density surface mount.
FEATURES
VHF/CATV band operation
Single-end push-pull IF amplifier suppresses fluctuation in output impedance.
Good capability of VHF-varactor diode due to balanced amplifier oscillator
Supply voltage: 5 V
Packaged in 8-pin SOP or SSOP suitable for high-density mounting
APPLICATIONS
Tuners for TV and VCR
Receivers for VHF band
ORDERING INFORMATION
Part Number
Package
Supplying Form
PC1686G-E1
8-pin plastic SOP (225 mil)
Embossed tape 12 mm wide.
Pin 1 indicates pull-out direction of tape.
Qty 2.5 kp/reel.
PC1686GV-E1
8-pin plastic SSOP (175 mil)
Embossed tape 8 mm wide.
Pin 1 indicates pull-out direction of tape.
Qty 1 kp/reel.
Remark To order evaluation samples, please contact your local NEC office. (Part number for sample order:
PC1686G,
PC1686GV)
Data Sheet P11100EJ4V0DS00
2
PC1686G/GV
INTERNAL BLOCK DIAGRAM
PIN CONFIGURATION (Top View)
8
7
6
5
1
2
3
4
IF Pre
Amp.
MIX
OSC
OSC
Buffer
REG.
1
2
3
4
8
7
6
5
1.
2.
3.
4.
5.
6.
7.
8.
OSC base (bypass)
OSC base (feedback)
OSC collector (coupling)
V
CC
IF output (open collector)
GND
RF input1 (bypass)
RF input2
Data Sheet P11100EJ4V0DS00
3
PC1686G/GV
PIN EXPLANATION
Pin
No.
Symbol
Function and Explanation
Equivalent Circuit
1
OSC base
(bypass)
Internal oscillator consists in balance amplifier.
2 pin and 3 pin should be externally equiped
with tank resonater circuit in order to oscillate
with feedback loop.
2
OSC base
(feedback)
1 pin should be grounded through approximate
10 pF coupling capacitor.
3
OSC
collector
(coupling)
V
CC
V
REF
amp.
3
1
2
to OSC buffer
4
V
CC
Supply voltage pin for the IC.
5
IF output
IF output pin. IF amplifier is designed as single-
end push-pull amplifier.
This pin is assigned for the emitter follower
output with 50
constant resistive impedance
in wide band.
V
CC
5
IF
output
from
IF pre
amp.
6
GND
GND pin for the IC.
7
RF input 1
(bypass)
7 pin and 8 pin are inputs for mixer designed as
double balanced type.
Either pin can be assigned for input and another
for ground.
8
RF input 2
V
CC
RF
input
from
OSC
buffer
to IF
amp.
3 pin is defined as open collector. This pin
should be coupled through resistor or
chock coil in order to adjust Q and be
supplied voltage. In case of abnormal
oscillation, adjust its Q lower to stabilize
the operation.
Data Sheet P11100EJ4V0DS00
4
PC1686G/GV
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Conditions
Rating
Unit
Supply Voltage
V
CC
T
A
= +25 C
6.0
V
Power Dissipation
P
D
T
A
= +85 C
Note
250
mW
Operating Ambient Temperature
T
A
-
40 to
+
85
C
Storage Temperature
T
stg
-
65 to
+
150
C
Note Mounted on 50
50
1.6-mm epoxy glass PWB, with copper patterning on both sides.
RECOMMENDED OPERATING RANGE
Parameter
Symbol
MIN.
TYP.
MAX.
UNIT
Supply Voltage
V
CC
4.5
5.0
5.5
V
Operating Ambient Temperature
T
A
-
40
+
25
+
85
C
ELECTRICAL CHARACTERISTICS (V
CC
= 5 V, T
A
= +25
C)
Parameter
Symbol
Conditions
MIN.
TYP.
MAX.
Unit
Circuit Current 1
I
CC
1
no input signal
Note
25
38
48
mA
Conversion Gain 1
CG1
f
RF
= 55 MHz, f
IF
= 44 MHz,
P
RF
=
-
40 dBm, P
OSC
=
-
5 dBm
Note
15
19
22
dB
Conversion Gain 2
CG2
f
RF
= 200 MHz, f
IF
= 50 MHz,
P
RF
=
-
40 dBm, P
OSC
=
-
5 dBm
Note
15.5
19.5
22.5
dB
Conversion Gain 3
CG3
f
RF
= 440 MHz, f
IF
= 50 MHz,
P
RF
=
-
40 dBm, P
OSC
=
-
5 dBm
Note
16
20
23
dB
Noise Figure 1
NF1
f
RF
= 55 MHz, f
IF
= 44 MHz,
P
OSC
=
-
5 dBm
Note
-
11
14
dB
Noise Figure 2
NF2
f
RF
= 200 MHz, f
IF
= 50 MHz
P
OSC
=
-
5 dBm
Note
-
11
14
dB
Noise Figure 3
NF3
f
RF
= 440 MHz, f
IF
= 50 MHz,
P
OSC
=
-
5 dBm
Note
-
12
15
dB
Maximum Output Power 1
P
O(sat)
1
f
RF
= 55 MHz, f
IF
= 44 MHz,
P
RF
= 0 dBm, P
OSC
=
-
5 dBm
Note
-
+
10
-
dBm
Maximum Output Power 2
P
O(sat)
2
f
RF
= 200 MHz, f
IF
= 50 MHz,
P
RF
= 0 dBm, P
OSC
=
-
5 dBm
Note
-
+
10
-
dBm
Maximum Output Power 3
P
O(sat)
3
f
RF
= 440 MHz, f
IF
= 50 MHz,
P
RF
= 0 dBm, P
OSC
=
-
5 dBm
Note
-
+
10
-
dBm
Note By test circuit 1
Data Sheet P11100EJ4V0DS00
5
PC1686G/GV
STANDARD CHARACTERISTICS (FOR REFERENCE) (V
CC
= 5 V, T
A
= +25
C unless otherwise specified)
Parameter
Symbol
Conditions
Reference Values
Unit
Oscillation Frequency Stability
f
stb
V
CC
= 10 %, f
OSC
= 100 to 490 MHz Note 1
100
kHz
Oscillation Frequency Drift
f
drift
f
OSC
= 100 to 490 MHz, 30 min
Note 1
100
kHz
Oscillation Start Voltage
V
OSC
f
OSC
= 100 to 490 MHz
Note 1
3.0
V
1 % Cross-modulation Distortion 1
CM1
f
RF
= 55 MHz, f
IF
= 44 MHz
Note 2, 3
94
dB
1 % Cross-modulation Distortion 2
CM2
f
RF
= 200 MHz, f
IF
= 50 MHz
Note 2, 3
94
dB
1 % Cross-modulation Distortion 3
CM3
f
RF
= 440 MHz, f
IF
= 50 MHz
Note 2, 3
94
dB
Notes 1. By test circuit 2
2. By test circuit 1
3. f
undes
= f
RF
12 MHz, P
RF
=
-
31 dBm, P
OSC
=
-
5 dBm
AM: 100 kHz, 30 % Mod., S/I Ratio = 46 dBc, output 75
open
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