QuickView - MAX19705 10-bit, 7.5Msps, Ultra-Low-Power Analog Front-End

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Description

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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 1.024V_P-P full-scale signals. Typical I/Q channel matching is ±0.01° phase and ±0.02dB gain.

The Tx DACs feature 77.2dBc SFDR at f_OUT = 620kHz and f_CLK = 7.5MHz. The analog I/Q full-scale output voltage is ±400mV differential. The Tx DAC commonmode DC level is programmable from 0.9V to 1.35V. The I/Q channel offset is adjustable. The typical I/Q channel matching is ±0.03dB gain and ±0.08° 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 MAX19705 operates on a single +2.7V to +3.3V analog supply and +1.8V to +3.3V digital I/O supply. The MAX19705 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, 7.5Msps Rx ADC and Dual 10-Bit, 7.5Msps Tx DAC
	Ultra-Low Power 28.2mW at f_CLK = 7.5MHz, Fast Mode 21mW at f_CLK = 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 f_IN = 1.875MHz (Rx ADC) SFDR = 77.2dBc at f_OUT = 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 f_IN = 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)

	Broadband Access Radio
	Portable Communication Equipment
	Private Mobile Radio (PMR)

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)

Supply Voltage (V)

Price^**

MAX19705

7.5

55.1 @ 1.875MHz

7.5

77.2 @ 620kHz

-76.1 @ 620kHz

-127 @ 620kHz

1.8
2.7 to 3.3

$7.95 @ 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.