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MAX2741ETI

Integrated L1-Band GPS Receiver

Maxim Integrated 

MAX2741

Integrated L1-Band GPS Receiver

Typical Interface Diagram

VCC1 1

N.C.

2

RFIN

3

VCC2 4

VCC3 5

VCC4 6

GND

7

28 27 26 25 24 23 22

MAX2741

SDO

21

N.C.

20

19 VCC5

GPSIF0

18

GPSIF1

17

GPSIF2

16

GPSCLK

15

8 9 10 11 12 13 14

BASEBAND IC

SDO

SD1

CS

SCLK

GPSIF0

GPSIF1

GPSIF2

GPSCLK

REFCLK

Interface Summary

All I/O connections are DC-coupled. Supply voltages as specified in the electrical specifications.

RF

I/O CONNECTION

RFIN

LNA Input

RECEIVER

RF BPF Output

RF BPF

IF

I/O CONNECTION

IFOUT+

IFOUT-

IFIN+

IFIN-

RECEIVER

1st IF Output from Mixer (+)

1st IF Output from Mixer (-)

1st IF Input (+)

1st IF Input (-)

IF FILTER

IF BPF Input, 2.5kΩ Differential

IF BPF Input, 2.5kΩ Differential

IF BPF Input, 2.5kΩ Differential

IF BPF Input, 2.5kΩ Differential

BASEBAND

I/O CONNECTION

SCLK

CS

SDI

SDO

SHDN

GPSCLK

GPSIF0

GPSIF1

GPSIF2

RECEIVER

CMOS Input

CMOS Input

CMOS Input

CMOS Output

CMOS Input

CMOS Output

CMOS Output

CMOS Output

CMOS Output

CMOS Output

CMOS Output

CMOS Output

CMOS Input

CMOS Output

CMOS Input

CMOS Input

CMOS Input

CMOS Input

BB IC/MAC

SYNTHESIZER

I/O CONNECTION

RECEIVER

EXTERNAL COMPONENTS

FILT

PLL Phase-Detector Charge-Pump

Output

PLL Loop Filter

XTAL

REFCLK

Crystal Oscillator Feedback

External TCXO or Crystal

Feedback Capacitors

Analog (also connected to REFCLK input to MAC)

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