General Description

The MAX19712 is an ultra-low-power, highly integrated mixed-signal analog front-end (AFE) ideal for wideband communication applications operating in full-duplex (FD) mode. Optimized for high dynamic performance and ultra-low power, the device integrates a dual 10-bit, 22Msps receive (Rx) ADC; dual 10-bit, 22Msps transmit (Tx) DAC; 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 FD mode is 50.4mW at a 22MHz clock frequency.

The Rx ADCs feature 54.7dB SINAD and 75.6dBc SFDR at 5.5MHz input frequency with a 22MHz clock frequency. The analog I/Q input amplifiers are fully differential and accept 1.024VP-P full-scale signals. Typical I/Q channel matching is ±0.01° phase and ±0.01dB gain.

Features

♦ Dual 10-Bit, 22Msps Rx ADC and Dual 10-Bit,

   22Msps Tx DAC

♦ Ultra-Low Power

   50.4mW at fCLK = 22MHz, FD Mode

   39.9mW at fCLK = 22MHz, Slow Rx Mode

   33.9mW at fCLK = 22MHz, Slow Tx Mode

   Low-Current Standby and Shutdown Modes

♦ Programmable Tx DAC Common-Mode DC Level

   and I/Q Offset Trim

♦ Excellent Dynamic Performance

   SNR = 54.8dB at fIN = 5.5MHz (Rx ADC)

   SFDR = 72.9dBc at fOUT = 2.2MHz (Tx DAC)

♦ Three 12-Bit, 1μs Aux-DACs

♦ 10-Bit, 333ksps Aux-ADC with 4:1 Input Mux and

   Data Averaging

♦ Excellent Gain/Phase Match

   ±0.01° Phase, ±0.01dB Gain (Rx ADC) at

   fIN = 5.5MHz

♦ Multiplexed Parallel Digital I/O

♦ Serial-Interface Control

♦ Versatile Power-Control Circuits

   Shutdown, Standby, Idle, Tx/Rx Disable

♦ Miniature 56-Pin Thin QFN Package

   (7mm x 7mm x 0.8mm)

Applications

   WCDMA Handsets

   801.11a/b/g WLAN

   RFID Readers

   VoIP Terminals

   Portable Communication Equipment