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Description

The MAX19708 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 device integrates a dual 10-bit, 11Msps receive (Rx) ADC; dual 10-bit, 11Msps transmit (Tx) DAC with TD-SCDMA baseband filters; three fast-settling 12-bit aux-DAC channels for ancillary RF front-end control; and a 10-bit, 333ksps housekeeping aux-ADC. The typical operating power in Tx-Rx FAST mode is 36.9mW at a 5.12MHz clock frequency.
The Rx ADCs feature 55dB SNR and 77.4dBc SFDR at a 1.87MHz input frequency with an 11MHz clock frequency. The analog I/Q input amplifiers are fully differential and accept 1.024VP-Pfull-scale signals. Typical I/Q channel matching is ±0.08°phase and ±0.02dB gain.

Features

1. Dual 10-Bit, 11Msps Rx ADC and Dual 10-Bit, 11Msps Tx DAC
2. Ultra-Low Power
3. Integrated TD-SCDMA Filters with > 55dB Stopband Rejection
4. Programmable Tx DAC Common-Mode DC Level and I/Q Offset Trim
5. Three 12-Bit, 1µs Aux-DACs
6. 10-Bit, 333ksps Aux-ADC with 4:1 Input Mux and Data Averaging
7. Multiplexed Parallel Digital I/O
8. Serial-Interface Control
9. Versatile Power-Control Circuits
10. Shutdown, Standby, Idle, Tx/Rx Disable
11. Miniature 48-Pin Thin QFN Package (7mm x 7mm x 0.8mm)