Rainbow Electronics MAX2740 - Manual (Page 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.
8 GC
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 0.01 µF.
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
0.01
µF.
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.