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MAX2769
Universal GPS Receiver
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2769 EV kit, V CC = 2.7V to 3.3V, T A = -40 ° C to +85 ° C, PGM = GND. Registers are set to the default power-up states. LNA input
is driven from a 50 Ω 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 10k Ω || 7.5pF on each pin. Typical values
are at V CC = 2.85V and T A = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
FREQUENCY SYNTHESIZER
LO Frequency Range
LO Tuning Gain
0.4V < V TUNE < 2.4V
1550
57
1610
MHz
MHz/V
Reference Input Frequency
Main Divider Ratio
Reference Divider Ratio
Charge-Pump Current
ICP = 0
ICP = 1
8
36
1
0.5
1
44
32,767
1023
MHz
—
—
mA
TCXO INPUT BUFFER/OUTPUT CLOCK BUFFER
Reference Input Level
Sine wave
0.4
V P-P
Clock Output Multiply/Divide
Range
÷4
x2
—
ADC
ADC Differential Nonlinearity
ADC Integral Nonlinearity
AGC enabled, 3-bit output
AGC enabled, 3-bit output
± 0.1
± 0.1
LSB
LSB
Note 1: MAX2769 is production tested at T A = +25 ° C. All min/max specifications are guaranteed by design and characterization
from -40°C to +85°C, unless otherwise noted. Default register settings are not production tested or guaranteed. 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
disabled and LNA2 becomes active. PLL is in an integer-N mode with f COMP = f TCXO / 16 = 1.023MHz and I CP = 0.5mA. The
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.
4
Maxim Integrated
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