10-Bit, 22Msps, Ultra-Low-Power Analog Front-End

 

Part Number	Replacement	Explanation

Description

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The MAX19706 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, 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 Tx-Rx FAST mode is 49.5mW at a 22MHz clock frequency.

The Rx ADCs feature 54.6dB SNR and 75.6dBc SFDR at a 5.5MHz input frequency with a 22MHz clock frequency. The analog I/Q input amplifiers are fully differential and accept 1.024V_P-P full-scale signals. Typical I/Q channel matching is ±0.12° phase and ±0.01dB gain.

The Tx DACs feature 72.6dBc SFDR at f_OUT = 2.2MHz and f_CLK = 22MHz. The analog I/Q full-scale output voltage is ±400mV differential. The Tx DAC common-mode DC level is programmable from 0.9V to 1.35V. The I/Q channel offset is adjustable. The typical I/Q channel matching is ±0.02dB gain and ±0.1° phase.

The Rx ADC and Tx DAC share a single, 10-bit parallel, high-speed digital bus allowing half-duplex operation for time-division duplex (TDD) applications. A 3-wire serial interface controls power-management modes, the aux-DAC channels, and the aux-ADC channels.

The MAX19706 operates on a single +2.7V to +3.3V analog supply and +1.8V to +3.3V digital I/O supply. The MAX19706 is specified for the extended (-40°C to +85°C) temperature range and is available in a 48-pin, thin QFN package. See a parametric table of the complete family of pin-compatible AFEs.

MAX19706: Functional Diagram Enlarge+

Key Features

• Dual, 10-Bit, 22Msps Rx ADC and Dual, 10-Bit, 22Msps Tx DAC
• Ultra-Low Power
  • 49.5mW at f_CLK = 22MHz, Fast Mode
  • 39.3mW at f_CLK = 22MHz, Slow Mode
  • Low-Current Standby and Shutdown Modes
• Programmable Tx DAC Common-Mode DC Level and I/Q Offset Trim
• Excellent Dynamic Performance
  • SNR = 54.6dB at f_IN = 5.5MHz (Rx ADC)
  • SFDR = 72.6dBc at f_OUT = 2.2MHz (Tx DAC)
• Three 12-Bit, 1µs Aux-DACs
• 10-Bit, 333ksps Aux-ADC with 4:1 Input Mux and Data Averaging Mode
• Excellent Gain/Phase Match
  • ±0.12° Phase, ±0.01dB Gain (Rx ADC) at f_IN = 5.5MHz
• 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/Uses

• 802.11a/b/g WLAN
• Portable Communication Equipment
• VoIP Terminals
• WiMAX™ and WiBro™ CPEs