Rainbow Electronics MAX2769B - Manual (Page 19)

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MAX2769B
Universal GPS Receiver
Detailed Register Definitions
Table 6. Default Register Settings
Table 7. Configuration 1 (Address: 0000)
REGISTER
NAME
ADDRESS
(A3:A0)
POWER-ON
RESET,
PGM = 0
(hex)
PRECONFIGURED DEVICE STATE, PGM = 1 (hex)
0 1 2 3 4 5 6 7
CONF1 0000 A2919A3 A2919A3 A2919A3 A2919A7 A2919A3 A2919A3 A293573 A293573 A29B26B
CONF2 0001 055028C 055121C 055028C 055121C 055028C 055028C 855030C 855030C 855030C
CONF3 0010 EAFE1DC EAFE1DC EAFE1DC EAFE1DC EAFE1DC EAFE1DC EAFE1DC EAFE1DC EAFE1DC
PLLCONF 0011 9EC0008 9EC0008 9EC0008 9EC0008 9EC0008 9EC0008 9EC0008 9EC0008 9EC0008
DIV 0100 0C00080 0C00080 0C00080 0C00080 0C00100 3D62300 0BA00D0 0C00080 0BC80D0
FDIV 0101 8000070 8000070 8000070 8000070 8000070 8000070 8000070 8000070 8000070
STRM 0110 8000000 8000000 8000000 8000000 8000000 8000000 8000000 8000000 8000000
CLK 0111 10061B2 10061B2 10061B2 10061B2 10061B2 10061B2 10061B2 10061B2 10061B2
TEST1 1000 1E0F401 1E0F401 1E0F401 1E0F401 1E0F401 1E0F401 1E0F401 1E0F401 1E0F401
TEST2 1001 28C0402 28C0402 28C0402 28C0402 28C0402 28C0402 28C0402 28C0402 7CC0403
DATA BIT LOCATION
DEFAULT
VALUE
(PGM = 0)
DESCRIPTION
CHIPEN 27 1
Chip enable. Set 1 to enable the device and 0 to disable the entire device except the
serial bus.
IDLE 26 0 Idle enable. Set 1 to put the chip in the idle mode and 0 for operating mode.
RESERVED 25:22 1000 —
RESERVED 21:20 10 —
RESERVED 19:18 10 —
RESERVED 17:16 01 —
MIXPOLE 15 0
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.
LNAMODE 14:13 00
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.
MIXEN 12 1 Mixer enable. Set 1 to enable the mixer and 0 to shut down the mixer.
ANTEN 11 1 Antenna bias enable. Set 1 to enable the antenna bias and 0 to shut down the antenna bias.
FCEN 10:5 001101
IF center frequency programming. Default for f
CENTER
= 3.092MHz, BW = 2.5MHz. The
MSB of FCEN is located in Register Test Mode 2 (Table 16).
001101 = 3.092MHz, 001011 = 4.092MHz, 010011 = 10.0MHz
FBW 4:3 00
IF filter center bandwidth selection. D4:D3 = 00: 2.5MHz; 10: 4.2MHz; 01: 9.66MHz;
11: Reserved.
F3OR5 2 0
Filter order selection. Set 0 to select the 5th-order Butterworth filter. Set 1 to select the 3rd-
order Butterworth filter.
FCENX 1 1
Polyphase filter selection. Set 1 to select complex bandpass filter mode. Set 0 to select
lowpass filter mode.
FGAIN 0 1 IF filter gain setting. Set 0 to reduce the filter gain by 6dB.