Maxim-integrated MAX2769 GPS Receiver Instrukcja Użytkownika Pobierz pdf (Strona 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

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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