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Single-Chip Global Positioning System
Receiver Front-End
Typical Operating Characteristics (continued)
(MAX2745 EV kit, V DD = +3.0V, SHDN = GND, f RF = 1575.42MHz, and T A = +25 ° C, unless otherwise noted.)
TEMPERATURE-SENSOR OUTPUT VOLTAGE
VOLTAGE-BOOSTER
TOTAL GAIN vs. TEMPERATURE
vs. TEMPERATURE
OUTPUT vs. VDD_VB
110
1.6
3.2
BST_CTRL = HIGH
108
V CC = 3V
V CC = 2.7V
1.4
1.2
3.0
V OUT = V DD
T A = -40 ° C
106
1.0
0.8
V DD = 3.6V
2.8
2.6
T A = +25 ° C
104
V CC = 2.4V
0.6
2.4
102
100
0.4
0.2
0
V DD = 2.4V
2.2
2.0
T A = +85 ° C
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
TEMPERATURE ( ° C)
TEMPERATURE ( ° C)
VDD_VB (V)
Pin Description
PIN
1
2
3, 4, 9, 11, 13,
25, 27, 32, 39,
43, 46
5, 6, 8, 14, 26,
30, 41, 44
7
10
12
15
16
17
18
19
20
21
22
23
24
NAME
RBIAS
CBIAS
V DD
GND
RFIN
IEXT_LNA
AGC_FIL
XTAL_SSEL
XTAL_CSEL
BST_CTRL
TEST_EN
VDD_VB
CKOUT
DOUT
VB_CS+
VB_CS-
V OUT
FUNCTION
External BIAS Resistor. For normal bias, connect a 100k ? (1%) resistor to ground.
BIAS Bypass Capacitor. Connect a 0.1μF capacitor to ground.
Power-Supply Voltage. Bypass with a 0.1μF capacitor to ground as close to the pins as possible.
Ground
RF Input Signal. Requires external matching network.
External LNA Voltage Supply
AGC External Filter. Requires external RC lowpass filter.
Crystal Swing Select. Drive logic high for full swing. Drive logic low for limited swing.
Crystal Clock Select. Drive logic high for fundamental mode of 16.368MHz. Drive logic low for third
overtone mode of 32.736MHz.
Active-High Boost Control Input. Drive logic high to activate the voltage booster (crystal oscillator is
biased from BIAS). Drive logic low to deactivate the voltage booster (crystal oscillator is self-biased).
Connect to Ground for Normal Operation
Power Supply for Voltage Booster. Connect to V DD if voltage booster is not used.
Full-Swing Clock Output
Single-Ended Full-Swing Digital Output
Positive Voltage Booster External Floating CAP. Connect a 6nF capacitor to GND.
Negative Voltage Booster External Floating CAP. Connect a 6nF capacitor to GND.
Voltage Booster Output. Bypass to GND with a 1μF capacitor as close to the pin as possible.
4
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