Rainbow-electronics MAX2740 Manual do Utilizador descarregar pdf (Página 4)

MAX2740

Integrated GPS Receiver and Synthesizer

4 _______________________________________________________________________________________

Pin Description

PIN NAME FUNCTION

1, 2, 4, 5, 6,

10, 11, 14, 15,

21, 22, 23, 26,

29, 32, 37, 41,

42, 47,

p ad d l e

GND Ground. Connect pin to ground.

3 LNA_IN Input of LNA Circuit. Matching network and blocking capacitor required.

7 RFMIX_IN-

Input to unused side of a differential pair that forms the RF section of a Gilbert cell mixer. This pin

should be AC-grounded through 100pF.

8GC

DC Control Voltage for Setting Gain Level of VGA. High input impedance. Voltage range of 0.5V

to 2.5V.

9 VCC_ANA Supply Voltage Pin for Analog Circuits. This pin requires external decoupling of typically 0.01µF.

12 VCC_VCO Supply Voltage Pin for VCO Circuit. This pin requires external decoupling of typically 1000pF.

13 TANK VCO Resonator Pin. A resonator is required at this pin.

16 VCC_DIG

Supply Voltage Pin for Digital Section of the IC. This pin requires external decoupling of typically

0.01µF.

17 DOWN

Down Output from the Phase-Frequency Detector. This pulses high whenever the phase of the

VCO leads the phase of the reference.

18 UP

Up Output from the Phase-Frequency Detector. This pulses high whenever the phase of the VCO

lags the phase of the reference.

19 GLS_OUT Output of Buffer that Provides a 90MHz Clock Signal. Requires external blocking capacitor.

20 REF_IN Reference Input for Synthesizer

24 FGA_OUT- FGA Inverted Output. Blocking capacitor required.

25 FGA_OUT+ FGA Noninverted Output. Blocking capacitor required.

27 FGA_IN- FGA Inverted Input. Blocking capacitor required.

28 FGA_IN+ FGA Noninverted Input. Blocking capacitor required.

30 VGA_OUT- VGA Inverted Output. Blocking capacitor required.

31 VGA_OUT+ VGA Noninverted Output. Blocking capacitor required.

33 VGA_IN- VGA Inverted Input. Blocking capacitor required.

34 VGA_IN+ VGA Noninverted Input. Blocking capacitor required.

35 IFMIX_OUT- IF Mixer Inverted Output. Blocking capacitor required.

36 IFMIX_OUT+ IF Mixer Noninverted Output. Blocking capacitor required.

38 IFMIX_IN- IF Mixer Inverted Input. Blocking capacitor required.

39 IFMIX_IN+ IF Mixer Noninverted Input. Blocking capacitor required.

40 VCC_IFMIX

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

1000pF.

1 2 3 4 5 6 7 8

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