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Description

The MAX19700 is an ultra-low-power, mixed-signal analog front-end (AFE) designed for TD-SCDMA handsets and data cards. Optimized for high dynamic performance at ultra-low power, the MAX19700 integrates a dual 10-bit, 7.5Msps receive (Rx) ADC, dual 10-bit, 7.5Msps transmit (Tx) DAC with TD-SCDMA baseband filters, and three fast-settling 12-bit aux-DAC channels for ancillary RF front-end control. The typical operating power in Tx-Rx FAST mode is 36.3mW at a 5.12Msps clock frequency.

The Rx ADCs feature 54.9dB SINAD and 78dBc SFDR at a 1.87MHz input frequency with a 7.5Msps sample frequency. The analog I/Q input amplifiers are fully differential and accept 1.024VP-Pfull-scale signals.Typical I/Q channel matching is ±0.22° phase and±0.02dB gain.

Features

1. Dual 10-Bit Rx ADC and Dual 10-Bit Tx DAC
2. Ultra-Low Power
 (1) 36.3mW at fCLK= 5.12Msps, Fast Mode
 (2) 19.8mW at fCLK= 5.12Msps, Slow Mode
 (3) Low Standby and Shutdown Current
3. Integrated TD-SCDMA Filters with >55dB Stopband Rejection
4. Excellent Dynamic Performance
 (1) SINAD = 54.9dB at fIN = 1.87MHz (Rx ADC)
 (2) SFDR = 76.5dBc at fOUT= 620kHz (Tx DAC)
5. Three 12-Bit, 1µs Aux-DACs
6. Single-Supply Operation
7. Multiplexed Parallel Digital I/O
8. Serial-Interface Control