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Integrated L1-Band GPS Receiver
Pin Description
PIN
1
2, 20, 22, 23
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
21
24
25
26
27
28
Exposed
NAME
V CC 1
N.C.
RFIN
V CC 2
V CC 3
V CC 4
GND
FILT
SCLK
CS
SDI
SHDN
XTAL
REFCLK
GPSCLK
GPSIF2
GPSIF1
GPSIF0
V CC 5
SDO
IFIN-
IFIN+
IFOUT-
IFOUT+
V CC 6
GND
FUNCTION
LNA Supply Connection. External RF bypass capacitor to ground required.
Reserved. Make no connections to this pin.
LNA Input. Connect to GPS antenna through a bandpass filter. This input requires an external
matching network to match to 50 ? . AC-couple to this pin.
VCO Supply Connection. External RF bypass capacitor to ground required.
CML Supply Connection. External RF bypass capacitor to ground required.
Digital Logic and PLL Supply Connection. External RF bypass capacitor to digital ground required.
Ground. Connect to PC board digital ground plane.
PLL Loop Filter Connection. This is the output of the phase detector’s charge pump. Use the
recommended filter on EV kit for optimal phase noise and lock time.
SPI Clock Input (CMOS)
SPI Chip-Select Input (CMOS, Active Low)
SPI Data Input (CMOS)
Full IC Power-Down. This shutdown pin disables the on-chip oscillator and the rest of the IC. To keep
the oscillator running, use the software shutdown (SYNTH:D8); (CMOS, active high).
Crystal Oscillator Feedback Capacitor Connection
Reference Clock Input for PLL. Drive with 1.2V P-P when using TCXO module.
GPS Clock Output to Baseband. This is the clock used by the ADC to sample the GPS data (CMOS).
Sampled IF Output, Bit 2 (CMOS). See Table 5.
Sampled IF Output, Bit 1 (CMOS). See Table 5.
Sampled IF Output, Bit 0 (CMOS). See Table 5.
IF Supply Connection. External RF bypass capacitor to ground required.
SPI Data Output (CMOS)
1st IF Input (Inverting). Connect this 2.5k ? differentially terminated input to the 1st IF filter’s (-) output.
1st IF Input (Noninverting). Connect this 2.5k ? differentially terminated input to the 1st IF filter’s (+)
output.
1st IF Output (Inverting). Connect this 2.4k ? differential output to the 1st IF filter’s (-) input.
1st IF Output (Noninverting). Connect this 2.4k ? differential output to the 1st IF filter’s (+) input.
RF Image-Reject Mixer Supply. External RF bypass capacitor to ground required.
RF Ground. Ultra-low inductance connection to ground. Place several vias to PC board ground plane.
4
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