MAX2740ECM 查看數據表（PDF） - Maxim Integrated

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MAX2740ECM

Integrated GPS Receiver and Synthesizer

Maxim Integrated 

Integrated GPS Receiver and Synthesizer

Pin Description (continued)

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.

AGC

GAIN SET

MAX2740

VCC

1

2

3

4

5

6

7

8

9

MAX4122

10

11

12

/2

/6

/6

/8

PFD

20MHz

36

35

34

33

32

31

30

29

28

27

26

25

TO DSP

MAX4122

Figure 1. Typical Application Circuit

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