Operating Temperature Range ........................... -40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range ............................ -65°C to +160°C
Lead Temperature (soldering, 10s) ................................. +300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
CAUTION!
ESD SENSITIVE DEVICE
DC Electrical Characteristics
(Operating conditions (unless otherwise specified): V
CC
= 2.7V to 3.0V; REFCLK driven with 10MHz sinusoid, 1.2V
P-P
; registers set
according to mode; no RF input signal; digital baseband outputs left open; T
A
= -40°C to +85°C. Typical values are measured at V
CC
=
2.75V, T
A
= +25°C.)
PARAMETER
Supply Voltage
Supply Current
Input-Logic High Threshold
Input-Logic Low Threshold
Input-Logic High/Low Current
Output-Logic High
Output-Logic Low
I
LOAD
= 100µA
I
LOAD
= 100µA
Normal operation (T
A
= +25°C)
Standby (V
SHDN
= V
IL
, SYNTH:D8 = 0)
CONDITIONS
MIN
2.7
TYP
30
0.7
MAX
3.0
42
UNITS
V
mA
V
V
CC
-
0.1
0.1
-10
V
CC
-
0.3
0.3
+10
V
µA
V
V
AC Electrical Characteristics
(Operating conditions (unless otherwise specified): V
CC
= 2.7V to 3.0V for T
A
= -40°C to +85°C; REFCLK driven at 10MHz sinusoid,
1.2V
P-P
; registers set according to mode; using the
Typical Application Circuit;
CW RF signal at 1575.42MHz. Typical values are mea-
sured at V
CC
= 2.75V, T
A
= +25°C.)
PARAMETER
1st CONVERSION STAGE (RF TO 1st IF)
RF Frequency
RF Conversion Gain
Noise Figure
Input IP3
RF Image Rejection
LO Leakage at RF
L1-band
(Note 1)
Mid-gain (CONFIG1:D4–D0 = 10000)
(Note 2)
(Notes 3, 4)
LO to RFIN pin
20
15
1575.42
21
4.7
-30
35
-90
32
MHz
dB
dB
dBm
dB
dBm
CONDITIONS
MIN
TYP
MAX
UNITS
www.maximintegrated.com
Maxim Integrated
│
2
MAX2741
Integrated L1-Band GPS Receiver
AC Electrical Characteristics (continued)
(Operating conditions (unless otherwise specified): V
CC
= 2.7V to 3.0V for T
A
= -40°C to +85°C; REFCLK driven at 10MHz sinusoid,
1.2V
P-P
; registers set according to mode; using the
Typical Application Circuit;
CW RF signal at 1575.42MHz. Typical values are mea-
sured at V
CC
= 2.75V, T
A
= +25°C.)
PARAMETER
2nd CONVERSION STAGE (1st IF TO ADC INPUT)
1st IF Frequency
Conversion Gain
Input IP3
Noise Figure
IF Output Port Admittance
IF Input Port Admittance
LPF -3dB Corner Frequency
SYNTHESIZER
I
CP_OH
I
CP_OL
Closed-Loop Phase Noise
Comparison Spurs
Reference Oscillator Frequency
REF Input Voltage Level
VCO Coarse Tune Range
DIGITAL
I/O
SPI Clock Frequency
Note
Note
Note
Note
Note
1:
2:
3:
4:
5:
Production tested for +25°C and +85°C, guaranteed by design and characterization for -40°C.
Test tones at 1575.8MHz and 1576.8MHz at -60dBm/tone.
Guaranteed by design and characterization.
Image frequency is 1575.42MHz + 2(f
IF
) = 1650.18MHz
Test tones at 37.38MHz and 36.88MHz at -50dBm/tone.
1
MHz
PLL charge-pump source current
PLL charge-pump sink current
At 1kHz offset
At ±200kHz offset
Sinusoid (Note 1)
Sinusoid (Note 1)
Programmable (CONFIG1:D7 to D5 = 000 to 111)
(Note 1)
2
0.6
240
75
-100
-55
-44
10
26
2.2
µA
µA
dBc/Hz
dBc/Hz
MHz
V
P-P
MHz
At IFOUT
Max gain (CONFIG1:D4–D0 = 11111) (Note 1)
Min gain (CONFIG1:D4–D0 = 00000) (Note 1)
1st conversion (Note 5)
Max gain (CONFIG1:D4–D0 = 11111)
Real
Imaginary
Real
Imaginary
(SYNTH:D13–D10 = 1111)
(SYNTH:D13–D10 = 0000)
48
37.38
61
10
-36
12
0.40
1.5
0.40
0.15
2.9
7.7
74
MHz
dB
dB
dBm
dB
mS
pF
mS
pF
MHz
CONDITIONS
MIN
TYP
MAX
UNITS
www.maximintegrated.com
Maxim Integrated
│
3
MAX2741
Integrated L1-Band GPS Receiver
Pin Description
PIN
1
2, 20, 22, 23
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
21
24
25
26
27
28
Exposed
Paddle
NAME
V
CC
1
N.C.
RFIN
V
CC
2
V
CC
3
V
CC
4
GND
FILT
SCLK
CS
SDI
SHDN
XTAL
REFCLK
GPSCLK
GPSIF2
GPSIF1
GPSIF0
V
CC
5
SDO
IFIN-
IFIN+
IFOUT-
IFOUT+
V
CC
6
GND
Reserved. Make no connections to this pin.
LNA Input. Connect to GPS antenna through a bandpass filter. This input requires an external
matching network to match to 50Ω. AC-couple to this pin.
VCO Supply Connection. External RF bypass capacitor to ground required.
CML Supply Connection. External RF bypass capacitor to ground required.
Digital Logic and PLL Supply Connection. External RF bypass capacitor to digital ground required.
Ground. Connect to PC board digital ground plane.
PLL Loop Filter Connection. This is the output of the phase detector’s charge pump. Use the
recommended filter on EV kit for optimal phase noise and lock time.
SPI Clock Input (CMOS)
SPI Chip-Select Input (CMOS, Active Low)
SPI Data Input (CMOS)
Full IC Power-Down. This shutdown pin disables the on-chip oscillator and the rest of the IC. To keep
the oscillator running, use the software shutdown (SYNTH:D8); (CMOS, active high).
Crystal Oscillator Feedback Capacitor Connection
Reference Clock Input for PLL. Drive with 1.2V
P-P
when using TCXO module.
GPS Clock Output to Baseband. This is the clock used by the ADC to sample the GPS data (CMOS).
Sampled IF Output, Bit 2 (CMOS). See Table 5.
Sampled IF Output, Bit 1 (CMOS). See Table 5.
Sampled IF Output, Bit 0 (CMOS). See Table 5.
IF Supply Connection. External RF bypass capacitor to ground required.
SPI Data Output (CMOS)
1st IF Input (Inverting). Connect this 2.5kΩ differentially terminated input to the 1st IF filter’s (-) output.
1st IF Input (Noninverting). Connect this 2.5kΩ differentially terminated input to the 1st IF filter’s (+)
output.
1st IF Output (Inverting). Connect this 2.4kΩ differential output to the 1st IF filter’s (-) input.
1st IF Output (Noninverting). Connect this 2.4kΩ differential output to the 1st IF filter’s (+) input.
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