MAX2745 데이터 시트보기 (PDF) - Maxim Integrated
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MAX2745 Datasheet PDF : 9 Pages
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Single-Chip Global Positioning System
Receiver Front-End
Pin Description (continued)
PIN
NAME
FUNCTION
28
VOUT- Quantizer Analog Negative Limited-Swing Output
29
VOUT+ Quantizer Analog Positive Limited-Swing Output
31
SCLK Serial Port Clock Input (Bidirectional PAD)
33
COE
Clock Output Enable. Drive logic high to enable the clock output. Drive logic low to disable the clock
output.
34
CFS
Clock Frequency Select. Drive logic high to select 16MHz. Drive logic low to select 32MHz.
35
ODS
Output Data Select. Drive logic high to select full-swing output. Drive logic low to select limited-
swing output.
36
BPF_CTRL Bandpass Filter (BPF) Control. Drive logic high to activate the tuning block control BPF. Drive logic
low to let BPF be controlled by fuses.
37
SDATA Serial Port Data (Bidirectional PAD)
38
TEMPOUT Temperature Sense DC Voltage Output
40
VTUNE VCO Tuning Input
42
CP_OUT PLL Charge-Pump Output. Analog high-impedance output. Current source. Connect directly to the
PLL loop filter input.
45
SHDN
Active-High Shutdown Input. Drive logic low to disable all device functions. Drive logic high for
normal operation.
47
XTALOUT Crystal Output. Connect directly to the external crystal.
48
XTALIN Crystal Input. Connect directly to the external crystal or TCXO.
Functional Diagram
1.57542GHz
BPF
LNA
SHUTDOWN
VDD1V6
POWER
SWITCH
VOLTAGE
BOOSTER
DIGITAL
CONTROL
VSPORT
IMAGE
REJECTION
VGA
BPF
AGC
QUANTIZER
/96
/48
PFD
TEMP
SENSOR
CP
MAX2745
MUX
4.092MHz IF OUTPUT:
FULL SWING
DIFFERENTIAL
LIMITED SWING
OUTPUT
CONTROL
16.368MHz
32.768MHz
CLOCK OUTPUT:
16.368MHz
32.768MHz
TEMP
SENSOR DC
OUTPUT
PLL LOOP
FILTER
CLOCK
FREQ
CONTROL
CLOCK
OUTPUT
CONTROL
_______________________________________________________________________________________ 5
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