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RF2861

DS120220

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or customerservice@rfmd.com.

Pin Names and Descriptions

Pin

Function

Type Description

Interface Schematic

1G2

DI

Gain control logic input. See logic control table.

2LNA IN

AI

Cellular LNA input.

3LNA EMITTER

AO

Cellular LNA emitter. A small inductor connects this pin to ground.

Cellular LNA gain can be adjusted by the inductance.

See pin 2.

4LNA OUT

AO

Cellular LNA output. Simple external L-C components required for

matching and VCC supply.

See pin 2.

5ISET2

AO

An external resistor connected to this pin sets the current of the

mixer. Increasing resistance decreases current.

6ISET1

AO

An external resistor connected to this pin sets the current of the

LNA. Increasing resistance decreases current.

7G1

DI

Gain control logic input. See logic control table.

8

MIX IN

AI

Cellular mixer RF single-end input.

9IF OUT+

AO

CDMA IF output. Open collector.

10

IF OUT-

AO

CDMA IF output. Open collector.

See pin 9.

11

GND

P

Ground.

12

LO IN

AI

LO single-end input. Matched to 50

.

13

VCC

P

LO amplifier VCC external bypass capacitor may be required.

14

LO OUT

AO

LO output. Internal DC block. Drives 50

.

15

TX BUFF

ENABLE

DI

Logic input. High enables TX LO output buffer amplifiers.

G2

LNA IN

LNA OUT

LNA EMITTER

G1

MIX IN

IF OUT+

IF OUT-

LO IN

70



TX BUFF ENABLE