General Description
The MAX19705 is an ultra-low-power, mixed-signal analog front-end (AFE) designed for power-sensitive communication equipment. Optimized for high dynamic performance at ultra-low power, the device integrates a dual 10-bit, 7.5Msps receive (Rx) ADC; dual 10-bit, 7.5Msps 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 Tx-Rx FAST mode is 28.2mW at a 7.5MHz clock frequency.
The Rx ADCs feature 55.1dB SNR and 73.4dBc SFDR at a 1.875MHz input frequency with a 7.5MHz 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 ±0.02dB gain.

FEATUREs
♦ Dual 10-Bit, 7.5Msps Rx ADC and Dual 10-Bit,
   7.5Msps Tx DAC
♦ Ultra-Low Power
   28.2mW at fCLK = 7.5MHz, Fast Mode
   21mW at fCLK = 7.5MHz, Slow Mode
   Low-Current Standby and Shutdown Modes
♦ Programmable Tx DAC Common-Mode DC Level
   and I/Q Offset Trim
♦ Excellent Dynamic Performance
   SNR = 55.1dB at fIN = 1.875MHz (Rx ADC)
   SFDR = 77.2dBc at fOUT = 620kHz (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, ±0.02dB Gain (Rx ADC) at
   fIN = 1.875MHz
♦ 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
   Broadband Access Radio
   Private Mobile Radio (PMR)
   Portable Communication Equipment