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RF2483PCBA

LOW NOISE DUAL-BAND QUADRATURE MODULATOR WITH AGC

RF Micro Devices 

RF2483

Pin

7

8

9

10

11

Function

LOLB

GND LO

LOHB

GND1

BAND SEL

Description

Interface Schematic

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

sideband 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.

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 flowing 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.

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

sideband 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.

Ground for LO buffers.

LOLB

GNDLO

See pins 7 and 9.

LOHB

GND LO

See pin 6.

Band select input to define active mode.

VCC2

CMOS input.

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

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

12

QSIG N Quadrature channel negative baseband input port. See QSIGP.

VCC2

50 Ω

12 pF

Rev A8 060203

5-39

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