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MAX2769
Universal GPS Receiver
Detailed Register Definitions
Table 6. Configuration 1 (Address: 0000)
DATA BIT
CHIPEN
IDLE
ILNA1
ILNA2
ILO
IMIX
MIXPOLE
LNAMODE
MIXEN
ANTEN
FCEN
FBW
F3OR5
FCENX
FGAIN
Maxim Integrated
LOCATION
27
26
25:22
21:20
19:18
17:16
15
14:13
12
11
10:5
4:3
2
1
0
DEFAULT
VALUE
1
0
1000
10
10
01
0
00
1
1
001101
00
0
1
1
DESCRIPTION
Chip enable. Set 1 to enable the device and 0 to disable the entire device except the
serial bus.
Idle enable. Set 1 to put the chip in the idle mode and 0 for operating mode.
LNA1 current programming.
LNA2 current programming.
LO buffer current programming.
Mixer current programming.
Mixer pole selection. Set 1 to program the passive filter pole at mixer output at 36MHz, or
set 0 to program the pole at 13MHz.
LNA mode selection, D14:D13 = 00: LNA selection gated by the antenna bias circuit, 01:
LNA2 is active; 10: LNA1 is active; 11: both LNA1 and LNA2 are off.
Mixer enable. Set 1 to enable the mixer and 0 to shut down the mixer.
Antenna bias enable. Set 1 to enable the antenna bias and 0 to shut down the antenna bias.
IF center frequency programming. Default for f CENTER = 4MHz, BW = 2.5MHz.
IF filter center bandwidth selection. D4:D3 = 00: 2.5MHz; 10: 4.2MHz; 01: 8MHz;
11: 18MHz (only used as a lowpass filter).
Filter order selection. Set 0 to select the 5th-order Butterworth filter. Set 1 to select the
3rd-order Butterworth filter.
Polyphase filter selection. Set 1 to select complex bandpass filter mode. Set 0 to select
lowpass filter mode.
IF filter gain setting. Set 0 to reduce the filter gain by 6dB.
17
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