General 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-P full-scale signals. Typical I/Q channel matching is ±0.22° phase and ±0.02dB gain.

FEATUREs
♦ Dual 10-Bit Rx ADC and Dual 10-Bit Tx DAC
♦ Ultra-Low Power
   36.3mW at fCLK = 5.12Msps, Fast Mode
   19.8mW at fCLK = 5.12Msps, Slow Mode
   Low Standby and Shutdown Current
♦ Integrated TD-SCDMA Filters with >55dB
   Stopband Rejection
♦ Excellent Dynamic Performance
   SINAD = 54.9dB at fIN = 1.87MHz (Rx ADC)
   SFDR = 76.5dBc at fOUT = 620kHz (Tx DAC)
♦ Excellent Gain/Phase Match
   ±0.22° Phase, ±0.02dB Gain (Rx ADC) at
   fIN = 1.87MHz at -0.5dBFS
♦ Three 12-Bit, 1µs Aux-DACs
♦ Single-Supply Operation
♦ Multiplexed Parallel Digital I/O
♦ Serial-Interface Control
♦ Versatile Power-Control Circuits
   Shutdown, Standby, Idle, Tx-Rx Disable
♦ Miniature 48-Pin Thin QFN Package
   (7mm x 7mm x 0.8mm)

APPLICATIONs
   TD-SCDMA Handsets
   TD-SCDMA Data Cards
   Portable Communication Equipment