VENUSLSLASHKGSLASHQP1S datasheet(3/8 Pages) ZARLINK

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VENUS-L Datasheet

Circuit Description

The RF section of VENUS-L contains all of the circuitry

necessary to downconvert the RF signal from 900 MHz

or 1900 MHz to an IF of 50-250 MHz, and to correctly

interface with a suitable IF SAW filter. Two RF inputs are

provided, one for the 1900MHz band and one for the 900

MHz band. The required input is activated by means of

the ‘BAND 1900’ pin.

The input is a g

m stage which will provide a characteristic

impedance to correctly terminate the RF image-reject

SAW filter.

Two LO ports are provided, one for 1900MHz band and

one for 900 MHz band, both with low noise buffer

amplifiers.

External matching components are required on the RF,

LO and IF ports.

Figure 2 - Pin Connections

QSOP16

CDMA IF

CDMA IFB

VCC

LO 2GHZ

GND

RF 900

GND

CHIP ENABLE

BAND 1900

GND

RF 1900

GND

LO 1GHZ

VCC

AMPS IFB

AMPS IF

Pin Description

Pin No

Pin Name

Description

CDMA IF

CDMA (1900MHz mixer) IF SAW output

CDMA IFB

CDMA (1900MHz mixer) IF SAW output bar

VCC

Positive supply

LO 2GHZ

2 GHz LO input for 1900MHz mixer

GND

Ground

RF 900

900MHz RF input

GND

Ground

CHIP ENABLE

Logic input for chip enable

AMPS IF

AMPS (900MHz mixer) IF SAW output

AMPS IFB

AMPS (900MHz mixer) IF SAW output bar

VCC

Positive supply

LO 1GHZ

1GHz LO input for 900MHz mixer

GND

Ground

RF 1900

1900MHz RF input

GND

Ground

BAND 1900

Logic input to select 1900MHz or 900MHz signal path operation

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