UPC1685G NEC, UPC1685G Datasheet - Page 3

• Manufacturer Part Number: UPC1685G
• 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
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.
IF output pin.
This pin is assigned for the open collector
output with high impedance dependent on
external inductance.
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
Data Sheet P14483EJ2V0DS00
V
buffer
V
OSC
from
REF
input
CC
V
RF
CC
V
V
REF
CC
Equivalent Circuit
3
1
PC1685G
2
to OSC
buffer
amp.
5
to IF
amp.
3