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MAX2140ETH
Complete SDARS Receiver
General DescriptionThe MAX2140 complete receiver is designed for satellite
digital audio radio services (SDARS). The device
includes a fully monolithic VCO and only needs a SAW at
the IF and a crystal to generate the reference frequency.
To form a complete SDARS radio, the MAX2140
requires only a low-noise amplifier (LNA), which can be
controlled by a baseband controller. The small number
of external components needed makes the MAX2140-
based platform the lowest cost and the smallest solu-
tion for SDARS.
The receiver includes a self-contained RF AGC loop
and baseband-controlled IF AGC loop, effectively pro-
viding a total dynamic range of over 92dB.
Channel selectivity is ensured by the SAW filter and by
on-chip monolithic lowpass filters.
The fractional-N PLL allows a very small frequency
step, making possible the implementation of an AFC
loop. Additionally, the reference is provided by an
external XTAL and on-chip oscillator. A reference buffer
output is also provided.
A 2-wire interface (I2C™ bus compatible) programs the
circuit for a wide variety of conditions, providing fea-
tures such as:
•Programmable gains
•Lowpass filters tuning
•Individual functional block shutdown
The MAX2140 minimizes the requirement on the base-
band controller. No compensation or calibration proce-
dures are required. The device is available in a 7mm ✕
7mm 44-pin thin QFN package.
ApplicationsSatellite Digital Audio Radio Services (SDARS)
2.4GHz ISM Radios
FeaturesIntegrated Receiver, Requires Only One SAW
FilterSelf-Contained RF AGC LoopDifferential I/Q InterfaceComplete Integrated Frequency GenerationBias Supply for External LNAsOvercurrent ProtectionLow-Power Standby ModeVery Small 44-Pin Thin QFN Package
MAX2140
Complete SDARS Receiver
Ordering Information19-3123; Rev 1a; 9/04
Block Diagram/Pin Configuration*EP = Exposed paddle.
I2C is a trademark of Philips Corp.
Purchase of I2C components from Maxim Integrated Products,
Inc., or one of its sublicensed Associated Companies, conveys
a license under the Philips I2C Patent Rights to use these com-
ponents in an I2C system, provided that the system conforms to
the I2C Standard Specification as defined by Philips.
MAX2140
Complete SDARS Receiver
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS(VCC= 3.1V to 3.6V; VINANT ≥VCC, VOUTANT in open circuit, TA= -40°C to +85°C. Typical values are at VCC= 3.3V, VINANT =
3.3V, and TA= +25°C, unless otherwise noted.) (Note 1)
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.
VCC_XXto GND.....................................................-0.3V to +4.3V
VINANT to GND....................................................-0.3V to +5.6V
AGCPWM to GND................................................-0.3V to +3.0V
Digital Input Current........................................................±10mA
Maximum VSWR Without Damage ........................................4:1
Maximum VSWR Without Oscillations ...................................4:1
Continuous Power Dissipation (TA= +70°C)
44-Pin QFN (derate 26.31mW/°C above +70°C) .....2105mW
Operating Temperature Range ..........................-40°C to +85°C
Junction Temperature .....................................................+150°C
Theta JC..........................................................................12°C/W
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
MAX2140
Complete SDARS Receiver
AC ELECTRICAL CHARACTERISTICS(MAX2140 EV kit, current drawn at VOUTANT, IVOUTANT= 150mA max, VCC= 3.1V to 3.6V, VINANT = 3.1V to 5.3V, fRF= 2320MHz
to 2345MHz, fLO= 2076MHz, TA= -40°C to +85°C. Typical values are at VCC= VINANT = 3.3V, fRF= 2338MHz, TA= +25°C, unless
otherwise noted.) (Note 2)
Interstage (IF) 259MHz SAW filter specification: insertion loss = 19dB max, 9.3MHz to 12MHz from center attenuation = 24dB min,
MAX2140
Complete SDARS Receiver
AC ELECTRICAL CHARACTERISTICS (continued)(MAX2140 EV kit, current drawn at VOUTANT, IVOUTANT= 150mA max, VCC= 3.1V to 3.6V, VINANT = 3.1V to 5.3V, fRF= 2320MHz
to 2345MHz, fLO= 2076MHz, TA= -40°C to +85°C. Typical values are at VCC= VINANT = 3.3V, fRF= 2338MHz, TA= +25°C, unless
otherwise noted.) (Note 2)
Interstage (IF) 259MHz SAW filter specification: insertion loss = 19dB max, 9.3MHz to 12MHz from center attenuation = 24dB min,
beyond 12MHz from center attenuation = 40dB min.
MAX2140
Complete SDARS Receiver
AC ELECTRICAL CHARACTERISTICS (continued)(MAX2140 EV kit, current drawn at VOUTANT, IVOUTANT= 150mA max, VCC= 3.1V to 3.6V, VINANT = 3.1V to 5.3V, fRF= 2320MHz
to 2345MHz, fLO= 2076MHz, TA= -40°C to +85°C. Typical values are at VCC= VINANT = 3.3V, fRF= 2338MHz, TA= +25°C, unless
otherwise noted.) (Note 2)
Interstage (IF) 259MHz SAW filter specification: insertion loss = 19dB max, 9.3MHz to 12MHz from center attenuation = 24dB min,
Note 3:At TA= +25°C, minimum and maximum values are guaranteed by design and characterization.
Note 4:At TA= +25°C and TA= +85°C, parameters are production tested.
Note 5:IF AGC reference level is defined as being the required voltage applied on pin AGCPWM, and the corresponding receiver
IF gain, to measure 20mVP-Pat each I/Q differential output when the RF input power is -91dBm. If even for zero volts
applied on pin AGCPWM the I/Q differential outputs are below 20mVP-Pwhen the RF input power is -91dBm, then the refer-
ence level is defined as zero volts.
Note 6:In-band IP2 and IP3 are measured with two CW tones at RF input: f1= 2339.55MHz, f2= 2339.75MHz.
Note 7:Out-of-band IP2 and IP3 are measured with two CW tones at RF input: f1= 2326.25MHz, f2= 2330.25MHz.
Note 8:Error computed using a crystal with no error.
Note 9:No spur in the offset frequency range.
TIMING CHARACTERISTICS
MAX2140
Complete SDARS Receiver
Typical Operating Characteristics(TA = +25°C, unless otherwise noted.)
