Integrated GPS Receiver and Synthesizer

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5

Pin Description (continued)

Figure 1. Typical Application Circuit

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PFD

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20MHz

TO DSP

AGC

GAIN SET

MAX4122

MAX4122

MAX2740

PIN

NAME

FUNCTION

43

RFMIX_OUT-

RF Mixer Inverted Input (same as RFMIX_OUT+)

44

RFMIX_OUT+

Open Emitter Output of the RF Downconverter. This pin requires an external pull-down resistor of

1.2k

Ω to establish the correct on-chip bias conditions. Requires a blocking capacitor.

45

VCC_RFMIX

Supply Voltage Pin for RF Downconverter. This pin requires external decoupling of typically

100pF.

46

RFMIX_IN

Input to RF Mixer. Requires a blocking capacitor that may be used as part of the match network.

48

LNA_OUT

LNA Output. Requires a pull-up inductor and a blocking capacitor. These may be configured as

the matching network.