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CXA1851N

Up/Down Converter for 900 MHz-Band Mobile Communications

Sony Semiconductor 

CXA1851N

Pin Description

Pin No. Symbol

Typical pin

voltage (V)

1 GND

0.0

2 RF BYPASS 1.1

3 RF INPUT

0.9

Equivalent circuit

REG

4 PEAKING

0.12

3

4

OUT

5 P/S

(for DOWN

CONV.)

0 to 4.5

6 P/S

(for UP

CONV.)

0 to 4.5

7 VCC

(for Up

CONV.)

2.7 to 4.5

8 RF OUTPUT 2.7

(Vcc=2.7V)

9 GND

0.0

5

6

REG

8

Description

GND pin for the down converter.

MIX input by-pass pin for the down

converter.

RF input pin for the down

converter. Because of high

impedance, a 4.7 nH external chip

inductor should be used for

2 impedance matching.

Emitter pin for the low-noise

REG amplifier. Connect an approximate-

ly 3 pF chip capacitor and an

approximately 22Ω chip resistor in

series to the GND.

Power saving control pin for the

down converter.

OFF when Vp/s≤1.0 V; ON when

Vp/s≥1.8 V

Power saving control pin for the up

converter.

OFF when Vp/s≤1.0 V; ON when

Vp/s≥1.8 V

Power supply for the up converter.

RF output pin for the up converter.

Connect this pin to the Pin 7 power

supply via the 15 nH chip inductor.

GND pin for the up converter RF

amplifier.

—2—

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