Integrated L1-Band GPS Receiver
Typical Interface Diagram
V CC 1
N.C.
RFIN
1
2
3
28
27
26
25
24
23
22
21
20
19
SDO
N.C.
V CC 5
BASEBAND IC
SDO
SD1
CS
V CC 2
V CC 3
V CC 4
GND
4
5
6
7
MAX2741
18
17
16
15
GPSIF0
GPSIF1
GPSIF2
GPSCLK
SCLK
GPSIF0
GPSIF1
GPSIF2
GPSCLK
REFCLK
8
9
10
11
12
13
14
Interface Summary
All I/O connections are DC-coupled. Supply voltages as specified in the electrical specifications.
RF
I/O CONNECTION
RFIN
I/O CONNECTION
IFOUT+
IFOUT-
IFIN+
IFIN-
I/O CONNECTION
SCLK
CS
SDI
SDO
SHDN
GPSCLK
GPSIF0
GPSIF1
GPSIF2
I/O CONNECTION
FILT
XTAL
REFCLK
RECEIVER
LNA Input
IF
RECEIVER
1st IF Output from Mixer (+)
1st IF Output from Mixer (-)
1st IF Input (+)
1st IF Input (-)
BASEBAND
RECEIVER
CMOS Input
CMOS Input
CMOS Input
CMOS Output
CMOS Input
CMOS Output
CMOS Output
CMOS Output
CMOS Output
SYNTHESIZER
RECEIVER
PLL Phase-Detector Charge-Pump
Crystal Oscillator Feedback
External TCXO or Crystal
RF BPF
RF BPF Output
IF FILTER
IF BPF Input, 2.5k ? Differential
IF BPF Input, 2.5k ? Differential
IF BPF Input, 2.5k ? Differential
IF BPF Input, 2.5k ? Differential
BB IC/MAC
CMOS Output
CMOS Output
CMOS Output
CMOS Input
CMOS Output
CMOS Input
CMOS Input
CMOS Input
CMOS Input
EXTERNAL COMPONENTS
PLL Loop Filter
Feedback Capacitors
Analog (also connected to REFCLK input to MAC)
10
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