RF2483 datasheet(10/34 Pages) RFMD

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RF2483

DS110505

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

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

Function

Description

Interface Schematic

7LOLB

Local oscillator input low band.

This input is biased internally at around 1.6V when the chip is in low band

mode and 0V when the chip is in high band mode or powered down. The

LO signal typically needs to be AC coupled.

The noise performance, carrier suppression at low output powers and side-

band suppression are all a function of LO power.

The optimum LO power is between 0dBm and 3dBm.

The device will work with LO powers as low as -20dBm however this is at

the expense of higher noise performance at high output powers and poorer

sideband suppression.

8GND LO

Ground return for the local oscillator input signals.

The GND LO pin is effectively the complementary LO input for both the high

band and low band LO signals. It has significant amounts of LO signal flow-

ing through it. This pin is brought out as an independent ground to enable

the PCB board designer to isolate the LO return from the RF outputs

ground and the general chip ground.

It is recommended that this ground is kept isolated from the die flag

ground. Any connections between the GND LO and any other ground

should be made through a ground plane.

See pins 7 and 9.

9LOHB

Local oscillator input high band.

This input is biased internally at around 1.6V when the chip is in high band

mode and 0V when the chip is in low band mode or powered down. The LO

HB signal typically needs to be AC coupled.

The noise performance, carrier suppression at low output powers and side-

band suppression are all a function of LO power.

The optimum LO power is between 0dBm and 3dBm.

The device will work with LO powers as low as -20dBm however this is at

the expense of higher noise performance at high output powers and poorer

sideband suppression.

GND1

Ground for LO buffers.

See pin 6.

BAND SEL

Band select input to define active mode.

CMOS input.

Logic 1 (1.4V to VCC)=High band mode.

Logic 2 (0V to 0.5V)=Low band mode.

QSIG N

Quadrature channel negative baseband input port. See QSIGP.

LO L B

GN DL O

LO H B

GND L O

V CC 2

V CC2

12 pF

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