MAX2451

19-0493; Rev 0; 12/95 K ATION EVALU BLE AVAILA IT 3V, Ultra-Low-Power Quadrature Demodulator ____________________________Features o Integrated Quadrature Phase Shifters o On-Chip Oscillator (Requires External Tuning Circuit) o 51dB Voltage Conversion Gain o On-Chip Divide-by-8 Prescaler o Baseband Output Bandwidth Up to 9MHz o CMOS-Compatible Enable o 5.5mA Operating Supply Current 2µA Shutdown Supply Current _______________General Description The monolithic MAX2451 is a quadrature demodulator with a supporting oscillator and divide-by-8 prescaler. It operates from a single +3V supply and draws only 5.5mA. The demodulator accepts an amplified and filtered IF signal in the 35MHz to 80MHz range, and demodulates it into I and Q baseband signals with 51dB of voltage conversion gain. The IF input is terminated with a 400Ω thin-film resistor for matching to an external IF filter. The baseband outputs are fully differential and have 1.2Vp-p signal swings. Pulling the CMOS-compatible ENABLE pin low shuts down the MAX2451 and reduces the supply current to less than 2µA, typical. To minimize spurious feedback, the MAX2451’s internal oscillator is set at twice the IF frequency via external tuning components. The MAX2451 comes in a 16-pin narrow SO package. MAX2451 ________________________Applications Digital Cordless Phones GSM and North American Cellular Phones Wireless LANs Digital Communications Pagers ______________Ordering Information PART MAX2451CSE TEMP. RANGE 0°C to +70°C...