UPC1686G NEC [NEC], UPC1686G Datasheet - Page 3

• Manufacturer Part Number: UPC1686G
• Description: GENERAL PURPOSE 5 V FREQUENCY DOWN-CONVERTER IC
• Manufacturer: NEC [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 approximate
10 pF coupling capacitor.
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.
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.
Function and Explanation
constant resistive impedance
Data Sheet P11100EJ4V0DS00
V
V
from
IF pre
amp.
RF
input
from
OSC
buffer
CC
REF
V
CC
Equivalent Circuit
3
PC1686G/GV
1
2
to OSC buffer
amp.
V
5
CC
IF
output
to IF
amp.
3