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Single-Chip Global Positioning System
Receiver Front-End
Pin Description (continued)
PIN
28
29
31
33
34
35
36
37
38
40
42
45
47
48
NAME
VOUT-
VOUT+
SCLK
COE
CFS
ODS
BPF_CTRL
SDATA
TEMPOUT
VTUNE
CP_OUT
SHDN
XTALOUT
XTALIN
1.57542GHz
FUNCTION
Quantizer Analog Negative Limited-Swing Output
Quantizer Analog Positive Limited-Swing Output
Serial Port Clock Input (Bidirectional PAD)
Clock Output Enable. Drive logic high to enable the clock output. Drive logic low to disable the clock
output.
Clock Frequency Select. Drive logic high to select 16MHz. Drive logic low to select 32MHz.
Output Data Select. Drive logic high to select full-swing output. Drive logic low to select limited-
swing output.
Bandpass Filter (BPF) Control. Drive logic high to activate the tuning block control BPF. Drive logic
low to let BPF be controlled by fuses.
Serial Port Data (Bidirectional PAD)
Temperature Sense DC Voltage Output
VCO Tuning Input
PLL Charge-Pump Output. Analog high-impedance output. Current source. Connect directly to the
PLL loop filter input.
Active-High Shutdown Input. Drive logic low to disable all device functions. Drive logic high for
normal operation.
Crystal Output. Connect directly to the external crystal.
Crystal Input. Connect directly to the external crystal or TCXO.
Functional Diagram
4.092MHz IF OUTPUT:
BPF
LNA
IMAGE
REJECTION
VGA
QUANTIZER
FULL SWING
DIFFERENTIAL
BPF
AGC
LIMITED SWING
OUTPUT
SHUTDOWN
POWER
SWITCH
CONTROL
VDD1V6
VOLTAGE
BOOSTER
/96
/48
PFD
16.368MHz
32.768MHz
MAX2745
DIGITAL
CONTROL
TEMP
SENSOR
CP
MUX
CLOCK OUTPUT:
16.368MHz
32.768MHz
VSPORT
TEMP
SENSOR DC
OUTPUT
PLL LOOP
FILTER
CLOCK
FREQ
CONTROL
CLOCK
OUTPUT
CONTROL
_______________________________________________________________________________________
5
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