UPC1685B View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPC1685B

GENERAL PURPOSE 5 V FREQUENCY DOWN-CONVERTER IC

NEC => Renesas Technology 

µPC1685G

PIN EXPLANATION

Pin

Symbol

No.

Function and Explanation

1

OSC base Internal oscillator consists in balance amplifier.

(bypass)

2 pin and 3 pin should be externally equiped

with tank resonater circuit in order to oscillate

with feedback loop.

2

OSC base 1 pin should be grounded through coupling

(feedback) capacitor to 5 pF.

3 pin is defined as open collector. This pin

should be coupled through resistor or chock coil

3

OSC

in order to adjust Q and be supplied voltage. In

collector

case of abnormal oscillation, adjust its Q lower

(coupling)

to stabilize the operation.

4

VCC

Supply voltage pin for the IC.

5

IF output

IF output pin.

This pin is assigned for the open collector

output with high impedance dependent on

external inductance.

Equivalent Circuit

VCC

VREF

312

to OSC

buffer

amp.

VCC

5

VREF

6

GND

GND pin for the IC.

7

RF input 1 7 pin and 8 pin are inputs for mixer designed as

(bypass)

double balanced type.

Either pin can be assigned for input and another

for ground.

8

RF input 2

VCC

from

OSC

buffer

RF

input

to IF

amp.

Data Sheet P14483EJ2V0DS00

3

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