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參數(shù)資料
| 型號(hào)： | UPC1687G-E1 |
| 廠商： | NEC Corp. |
| 英文描述： | GENERAL PURPOSE 5 V FREQUENCY DOWN-CONVERTER IC |
| 中文描述： | 一般用途5 V頻率下變頻器芯片 |
| 文件頁(yè)數(shù)： | 3/16頁(yè) |
| 文件大?。?/td> | 81K |
| 代理商： | UPC1687G-E1 |
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Data Sheet P11101EJ4V0DS00
3
μ
PC1687G/GV
5
from IF
pre amp.
IF
output
V
CC
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 coupling
capacitor to 5 pF.
3
OSC
collector
(coupling)
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.
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
from
OSC
buffer
RF
input
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.
3
1
2
V
CC
V
REF
to OSC
buffer
amp.
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