Maxim Integrated MAX2769 GPS Receiver - Manual (Page 3)

LD pin, the part can be programmed to instead provide the output signal, the reference clock, or results from a sigma-delta
test. It can also be programmed to provide a short to the active antenna or to be an independent test point for voltage.
The part is programmed through ten registers across a 3-wire SPI interface. Registers are described in Table 1. For further
details, please refer to the
MAX2769 data sheet .
Table 1. Description of SPI Configuration Registers
Register Address Function Default
CONF1<31:0> 0000 Configures Rx and IF sections, sets antenna bias and LNA autoselect A2919A3
CONF2<31:0> 0001 Configures AGC and output format 055028C
CONF3<31:0> 0010 Configures PGA, and details of AGC, filtering, and data streaming EAFE1DC
PLLCONFIG<31:0> 0011 Sets PLL, VCO, and CLK settings 9EC0008
DIV<31:0> 0100 Sets PLL main and reference division ratios 0C00080
FDIV<31:0> 0101 Sets PLL fractional division ratios 8000070
STRM<31:0> 0110 Configures DSP interface frame streaming 8000000
CLK<31:0> 0111 Sets fractional clock divider values 10061B2
TEST1<31:0> 1000 Sets up test mode 1E0D401
TEST2<31:0> 1001 Sets up test mode 14C0002
For initial characterization in a MAX2769 EV kit, the parameters listed in Table 2 can be measured with the suggested
procedures that follow. The
MAX2769 EV kit data sheet should be consulted for more details. Some settings differ from default
values to facilitate testing; users are free to select different settings.
Table 2. Parameters to be Tested in Suggested Procedure
Parameter
Pins at which
measurements are made
on the MAX2769 Connectors at which
measurements are made on the
MAX2769 EV kit
Target value
LNA1 Gain 27–2 J7–J8 19dB
LNA2 Gain 25–2 J6–J8 13dB
System IP3 with
LNA1
27–18 J7–J2 -26dBm
System IP3 with
LNA2
25–18 J6–J2 -20dBm
LNA1 NF (Default
Mode)
27–2 J7–J8 0.8dB
LNA2 NF 25–2 J6–J8 1.5dB
LNA1 P1dB (Output) 27–2 J7–J8 8dBm
LNA2 P1dB (Output) 25–2 J6–J8 10dB
Cascaded System
NF, LNA1
27–18 J7–J2 1.4dB
Cascaded System
NF, LNA2
25–18 J6–J2 2.7dB
Current
Consumption
(Default Mode,
11, 13, 14, 19, 23 W19, W20, W11, W12
19mA (default mode device only)
(36mA at 3V, 140mA at ±5V for entire
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