UPC1687G NEC, UPC1687G Datasheet - Page 3

• Manufacturer Part Number: UPC1687G
• Description: GENERAL PURPOSE 5 V FREQUENCY DOWN-CONVERTER IC
• Manufacturer: NEC

PIN EXPLANATION
Pin
No.
1
2
3
4
5
6
7
8
OSC base
(bypass)
OSC base
(feedback)
OSC
collector
(coupling)
V
IF output
GND
RF input 1
(bypass)
RF input 2
CC
Symbol
IF output pin. IF amplifier is designed as single-
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.
1 pin should be grounded through coupling
capacitor to 5 pF.
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.
Supply voltage pin for the IC.
end push-pull amplifier.
This pin is assigned for the emitter follower
output with 50
in wide band.
GND pin for the IC.
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.
Function and Explanation
constant resistive impedance
Data Sheet P11101EJ4V0DS00
from IF
pre amp.
V
V
buffer
OSC
REF
from
input
CC
RF
V
CC
Equivalent Circuit
3
PC1687G/GV
1
2
V
5
CC
to OSC
buffer
amp.
IF
output
to IF
amp.
3