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MAX2420 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX2420 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 14 page General Description The MAX2420/MAX2421/MAX2422/MAX2460/MAX2463 are highly integrated front-end ICs that provide the lowest cost solution for cordless phones and ISM-band radios operating in the 900MHz band. All devices incorporate transmit and receive image-reject mixers to reduce filter cost. They operate with a +2.7V to +4.8V power supply, allowing direct connection to a three-cell battery stack. The receive 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. The transmitter consists of a variable-gain IF amplifier with more than 35dB control range, an image-reject upconverter with 35dB image rejection, and a power- amplifier (PA) predriver that produces up to +2dBm (in some applications serving as the final power stage). 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. Four 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. For applications using direct VCO or BPSK transmit mod- ulation, as well as receive image rejection, consult the MAX2424/MAX2426 data sheet. For receive-only devices, refer to the MAX2440/MAX2441/MAX2442 data sheet. ________________________Applications Cordless Phones Spread-Spectrum Communications Wireless Telemetry Two-Way Paging Wireless Networks Features o Receive/Transmit Mixers with 35dB Image Rejection o Adjustable-Gain LNA o Up to +2dBm Combined Receiver Input IP3 o 4dB Combined Receiver Noise Figure o >35dB of Transmit Power Control Range o PA Predriver Provides up to +2dBm o Low Current Consumption: 23mA Receive 26mA Transmit 9.5mA Oscillator o 0.5µA Shutdown Mode o Operates from Single +2.7V to +4.8V Supply 900MHz Image-Reject Transceivers ________________________________________________________________ Maxim Integrated Products 1 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 GND GND GND TANK TXON PREOUT PREGND MOD DIV1 VCOON RXON CAP2 N.C. TXIN LNAGAIN TXOUT GND GND RXIN TXGAIN RXOUT CAP1 SSOP TOP VIEW MAX2420 MAX2421 MAX2422 MAX2460 MAX2463 TANK VCC VCC VCC VCC VCC ___________________Pin Configuration 19-1234; Rev 5; 8/03 PART MAX2420EAI MAX2421EAI MAX2422EAI -40°C to +85°C -40°C to +85°C -40°C to +85°C TEMP RANGE PIN-PACKAGE 28 SSOP 28 SSOP 28 SSOP _______________Ordering Information MAX2460EAI -40°C to +85°C 28 SSOP Functional Diagram appears on last page. MAX2463EAI -40°C to +85°C 28 SSOP High side INJECTION TYPE fRF + 10.7 LO FREQ (MHz) High side High side fRF + 70 fRF + 46 MAX2422 MAX2421 70 46 Low side fRF - 110 MAX2463 110 MAX2420 PART 10.7 IF FREQ (MHz) ______________________Selector Guide Low side fRF - 10.7 MAX2460 10.7 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. EVALUATION KIT AVAILABLE |
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