Rainbow-electronics MAX2740 Bedienungsanleitung PDF herunterladen (Seite 5)

MAX2740

Integrated GPS Receiver and Synthesizer

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Pin Description (continued)

Figure 1. Typical Application Circuit

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PFD

20MHz

TO DSP

AGC

GAIN SET

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

1.2kΩ 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.

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Rainbow-electronics MAX2740 Bedienungsanleitung Seite 5