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MAX2440EAIMAXIMN/a1avai900MHz Image-Reject Receivers
MAX2441EAIMAXIMN/a774avai900MHz Image-Reject Receivers


MAX2441EAI ,900MHz Image-Reject ReceiversELECTRICAL CHARACTERISTICS(V = +2.7V to +4.8V, no RF signals applied, LNAGAIN = unconnected, V = 2. ..
MAX244CQH ,+5V-Powered, Multichannel RS-232 Drivers/ReceiversELECTRICAL CHARACTERISTICS—MAX220/222/232A/233A/242/243(V = +5V ±10%, C1–C4 = 0.1µF‚ MAX220, C1 = 0 ..
MAX244CQH+ ,+5V-Powered, Multichannel RS-232 Drivers/ReceiversELECTRICAL CHARACTERISTICS—MAX220/222/232A/233A/242/243(V = +5V ±10%, C1–C4 = 0.1µF‚ MAX220, C1 = 0 ..
MAX244CQH-D ,+5V-Powered, Multichannel RS-232 Drivers/ReceiversElectrical Characteristics—MAX220/222/232A/233A/242/243(V = +5V ±10%, C1–C4 = 0.1µF‚ MAX220, C1 = 0 ..
MAX244EQH ,+5V-Powered, Multichannel RS-232 Drivers/ReceiversFeaturesThe MAX220–MAX249 family of line drivers/receivers isSuperior to Bipolarintended for all EI ..
MAX2451 ,3V, Ultra-Low-Power Quadrature DemodulatorApplicationsDigital Cordless PhonesPART TEMP. RANGE PIN-PACKAGEMAX2451CSE 0°C to +70°C 16 Narrow SO ..
MAX5886EGK+D ,3.3V, 12-Bit, 500Msps High Dynamic Performance DAC with Differential LVDS InputsApplicationsEPN.C. 1 51 B7NBase Stations: Single/Multicarrier UMTS, N.C. 2 50 B7PN.C. 3 49 B8NCDMA, ..
MAX5887EGK ,3.3V, 14-Bit, 500Msps High Dynamic Performance DAC with Differential LVDS InputsApplicationsEPBase Stations: Single/Multicarrier UMTS, B1P 1 51 B9NB1N 2 50 B9PCDMA, GSM B0P 3 49 B ..
MAX5887EGK+D ,3.3V, 14-Bit, 500Msps High Dynamic Performance DAC with Differential LVDS InputsApplicationsEPBase Stations: Single/Multicarrier UMTS, B1P 1 51 B9NB1N 2 50 B9PCDMA, GSM B0P 3 49 B ..
MAX5888AEGK ,3.3V, 16-Bit, 500Msps High Dynamic Performance DAC with Differential LVDS InputsApplicationsEPB3P 1 51 B11NBase Stations: Single-/Multicarrier UMTS, B3N 2 50 B11PB2P 3 49 B12NCDMA ..
MAX5888AEGK+ ,3.3V, 16-Bit, 500Msps High Dynamic Performance DAC with Differential LVDS Inputsfeatures an integrated 1.2V bandgap ref-♦ 68-Lead QFN-EP Packageerence and control amplifier to ens ..
MAX5888AEGK+D ,3.3V, 16-Bit, 500Msps High Dynamic Performance DAC with Differential LVDS InputsApplicationsEPB3P 1 51 B11NBase Stations: Single-/Multicarrier UMTS, B3N 2 50 B11PB2P 3 49 B12NCDMA ..


MAX2440EAI-MAX2441EAI
900MHz Image-Reject Receivers
General Description
The MAX2440/MAX2441/MAX2442 highly integrated
front-end receiver ICs provide the lowest cost solution for
cordless phones and ISM-band radios operating in the
900MHz band. All devices incorporate receive image-
reject mixers to reduce filter cost. They operate with a
+2.7V to +4.8V power supply, allowing direct connection
to a 3-cell battery stack.
The signal path incorporates an adjustable-gain LNA
and an image-reject downconverter with 35dB image
suppression. These features yield excellent combined
downconverter noise figure (4dB) and high linearity with
an input third-order intercept point (IP3) of up to +2dBm.
All devices include an on-chip local oscillator (LO),
requiring only an external varactor-tuned LC tank for
operation. The integrated divide-by-64/65 dual-modulus
prescaler can also be set to a direct mode, in which it
acts as an LO buffer amplifier. Three separate power-
down inputs can be used for system power manage-
ment, including a 0.5µA shutdown mode. These parts
are compatible with commonly used modulation
schemes such as FSK, BPSK, and QPSK, as well as fre-
quency hopping and direct sequence spread-spectrum
systems. All devices come in a 28-pin SSOP package.
Evaluation kits are available for the MAX2420/
MAX2421/MAX2422. The MAX2420/MAX2421/MAX2422
are transceivers whose receive sections and pinout are
identical to the MAX2440/MAX2441/MAX2442.
For complete transceiver devices, refer to the MAX2420/
MAX2421/MAX2422/MAX2460/MAX2463 and MAX2424/
MAX2426 data sheets.
________________________Applications

Cordless PhonesSpread-Spectrum Communications
Wireless TelemetryTwo-Way Paging
Wireless Networks
Features
Receive Mixer with 35dB Image RejectionAdjustable-Gain LNAUp to +2dBm Combined Receiver Input IP34dB Combined Receiver Noise FigureLow Current Consumption:23mA Receive
9.5mA Oscillator
0.5µA Shutdown ModeOperates from Single +2.7V to +4.8V Supply
MAX2440/MAX2441/MAX2442
900MHz Image-Reject Receivers
___________________Pin Configuration

19-1352; Rev 0; 4/98
_______________Ordering Information
Functional Diagram appears at end of data sheet.
______________________Selector Guide
MAX2440/MAX2441/MAX2442
900MHz Image-Reject Receivers
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +4.8V, no RF signals applied, LNAGAIN = unconnected, VVCOON= 2.4V, VRXON= VMOD= VDIV1= 0.45V, PREGND
= GND, TA= TMINto TMAX. Typical values are at TA= +25°C, VCC= +3.3V, unless otherwise noted.)
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.
Note 1:
Calculated by measuring the combined oscillator and prescaler supply current and subtracting the oscillator supply current.
Note 2:
Calculated by measuring the combined oscillator and LO buffer supply current and subtracting the oscillator supply current.
Note 3:
Calculated by measuring the combined receive and oscillator supply current and subtracting the oscillator supply current.
With LNAGAIN = GND, the supply current drops by 4.5mA.
VCCto GND...........................................................-0.3V to +5.5V
Voltage on LNAGAIN, RXON, VCOON,
DIV1, MOD...............................................-0.3V to (VCC+ 0.3V)
RXIN Input Power..............................................................10dBm
TANK, TANKInput Power...................................................2dBm
Continuous Power Dissipation (TA= +70°C)
SSOP (derate 9.50mW/°C above +70°C)......................762mW
Operating Temperature Range
MAX244_EAI.....................................................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +165°C
Lead Temperature (soldering, 10sec).............................+300°C
AC ELECTRICAL CHARACTERISTICS
(MAX242X/MAX246X EV kit, VCC= +3.3V; fLO= 925.7MHz (MAX2440), fLO= 961MHz (MAX2441), fLO= 985MHz (MAX2442),
fRXIN= 915MHz; PRXIN= -35dBm; VLNAGAIN= 2V; VVCOON= VRXON = 2.4V; RXON = MOD = DIV1 = PREGND = GND; TA= +25°C;
unless otherwise noted.)
MAX2440/MAX2441/MAX2442
900MHz Image-Reject Receivers
MAX2440/MAX2441/MAX2442
900MHz Image-Reject Receivers
AC ELECTRICAL CHARACTERISTICS (continued)

(MAX242X/MAX246X EV kit, VCC= +3.3V; fLO= 925.7MHz (MAX2440), fLO= 961MHz (MAX2441), fLO= 985MHz (MAX2442),
fRXIN= 915MHz; PRXIN= -35dBm; VLNAGAIN= 2V; VVCOON= VRXON= 2.4V; RXON = MOD = DIV1 = PREGND = GND; TA= +25°C;
unless otherwise noted.)
Note 4:
Guaranteed by design and characterization.
Note 5:
Image rejection typically falls to 30dBc at the frequency extremes.
Note 6:
Refer to the Typical Operating Characteristicsfor plots showing receiver gain versus LNAGAIN voltage, input IP3 versus
LNAGAIN voltage, and noise figure versus LNAGAIN voltage.
Note 7:
Two tones at PRXIN= -45dBm each, f1 = 915.0MHz and f2 = 915.2MHz.
Note 8:
Time delay from RXON = 0.45V to RXON = 2.4V transition to the time the output envelope reaches 90% of its final value.
Note 9:
Refers to useable operating range. Tuning range of any given tank circuit design is typically much narrower (refer to Figure 1).
Note 10:
Using tank components shown in Figure 1.
Note 11:
This approximates a typical application in which a transmitter is followed by an external PA and a T/R switch with finite
isolation.
Note 12:
Relative to the rising edge of PREOUT.
MAX2440/MAX2441/MAX2442
900MHz Image-Reject Receivers
Typical Operating Characteristics

(MAX242X/MAX246X EV kit, VCC= +3.3V; fLO= 925.7MHz (MAX2440), fLO= 961MHz (MAX2441), fLO= 985MHz (MAX2442),
fRXIN= 915MHz; PRXIN= -35dBm; VLNAGAIN= 2V; VVCOON= 2.4V; RXON = VCC;MOD = DIV1 = PREGND = GND; TA= +25°C;
unless otherwise noted.)
MAX2440/MAX2441/MAX2442
900MHz Image-Reject Receivers
Typical Operating Characteristics (continued)

(MAX242X/MAX246X EV kit, VCC= +3.3V; fLO= 925.7MHz (MAX2440), fLO= 961MHz (MAX2441), fLO= 985MHz (MAX2442),
fRXIN= 915MHz; PRXIN= -35dBm; VLNAGAIN= 2V; VVCOON= 2.4V; RXON = VCC;MOD = DIV1 = PREGND = GND; TA= +25°C;
unless otherwise noted.)
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