MAX19706 10-Bit, 22Msps, Ultra-Low-Power Analog Front-End

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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.

Key Features

Applications/Uses

	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)

	802.11a/b/g WLAN
	Portable Communication Equipment
	VoIP Terminals
	WiMAX and Wi-Bro CPEs

Key Specifications: Fast CODECs / Analog Front-End (AFE)

Part Number

ADC Input Channels

ADC Conv. Speed (Msps)

SNR@f_in (dB)

DAC Resolution (Bits)

DAC Output Channels

DAC Speed (Msps)

SFDR @ f_OUT (dBc)

THD@f_OUT (dBc)

Noise Spectral Density @ f_out (dBFS/Hz)

Data Bus Interface

Reference Voltage (V)

EV-Kit

Supply Voltage (V)

RoHS Available

Package

Operating Temp. Range (°C)

Price^**

MAX19706

54.6 @ 5.5MHz

72.6 @ 2.2MHz

-70.2 @ 2.2MHz

-130.1 @ 2.2MHz

Multiplexed
Parallel

Int/Ext

Yes

1.8
2.7 to 3.3

Yes

THIN QFN/48

-40 to +85

$8.45 @ 1k

See All Fast CODECs / Analog Front-End (AFE) (15)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.