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MAX2769B

Universal GPS Receiver

AC ELECTRICAL CHARACTERISTICS* (continued)

input is driven from a 50I source. All RF measurements are done in the analog output mode with ADC bypassed. PGA gain is set

to 51dB gain by serial-interface word GAININ = 111010. Maximum IF output load is not to exceed 10kI||7.5pF on each pin. Typical

acterization from -40NC to +85NC, unless otherwise noted. Default register settings are not production tested or guaran-

teed. User must program the registers upon power-up.

Note 2: Default, low-NF mode of the IC. LNA choice is gated by the ANT_FLAG signal. In the normal mode of operation without an

active antenna, LNA1 is active. If an active antenna is connected and ANT_FLAG switches to 1, LNA1 is automatically dis-

complex IF filter is configured as a 5th-order Butterworth filter with a center frequency of 4MHz and bandwidth of 2.5MHz.

Output data is in a 2-bit sign/magnitude format at CMOS logic levels in the I channel only.

Note 3: The LNA output connects to the mixer input without a SAW filter between them.

Note 4: Two tones are located at 12MHz and 24MHz offset frequencies from the GPS center frequency of 1575.42MHz at -60dBm/

tone. Passive pole at the mixer output is programmed to be 13MHz.

Note 5: Measured from the LNA input to the LNA output. Two tones are located at 12MHz and 24MHz offset frequencies from the

GPS center frequency of 1575.42MHz at -60dBm per tone.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

LNA2 INPUT

Power Gain

13

dB

Noise Figure

1.14

dB

Input IP3

(Note 5)

1

dBm

Output Return Loss

19

dB

Input Return Loss

11

dB

FREQUENCY SYNTHESIZER

LO Frequency Range

1550

1610

MHz

LO Tuning Gain

57

MHz/V

Reference Input Frequency

8

44

MHz

Main Divider Ratio

36

32,767

—

Reference Divider Ratio

1

1023

—

Charge-Pump Current

ICP = 0

0.5

mA

ICP = 1

1

TCXO INPUT BUFFER/OUTPUT CLOCK BUFFER

Frequency Range

8

32

MHz

2

V

0.8

V

Capacitive Slew Current

Load = 10k

11

mA

Output Load

10||40

kI||pF

Reference Input Level

Sine wave

0.5

Clock Output Multiply/Divide

Range

/4, /2, /1

(x2, max input frequency of 16MHz)

÷4

x2

—

ADC

ADC Differential Nonlinearity

AGC enabled, 3-bit output

Q

0.1

LSB

ADC Integral Nonlinearity

AGC enabled, 3-bit output

Q

0.1

LSB

*The parametric values (min, typ, max limits) shown in the Electrical Characteristics table supersede values quoted elsewhere in this data sheet.