QuickView - MAX19708 10-bit, 11Msps, Ultra-Low-Power Analog Front-End

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Description

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The MAX19708 is an ultra-low-power, mixed-signal analog front-end (AFE) designed for TD-SCDMA handsets and data cards. Optimized for high dynamic performance at ultra-low power, the device integrates a dual 10-bit, 11Msps receive (Rx) ADC; dual 10-bit, 11Msps transmit (Tx) DAC with TD-SCDMA baseband filters; 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 36.9mW at a 5.12MHz clock frequency.

The Rx ADCs feature 55dB SNR and 77.4dBc SFDR at a 1.87MHz input frequency with an 11MHz 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 ±0.08° phase and ±0.02dB gain.

The Tx DACs with TD-SCDMA lowpass filters feature -3dB cutoff frequency of 1.32MHz and > 55dB stopband rejection at f_IMAGE = 4.32MHz. The analog I-Q full-scale output voltage range is selectable at ±410mV or ±500mV differential. The output DC common-mode voltage is selectable from 0.9V to 1.4V. The I/Q channel offset is adjustable to optimize radio lineup sideband/carrier suppression. Typical I-Q channel matching is ±0.02dB gain and ±0.04° 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 MAX19708 operates on a single +2.7V to +3.3V analog supply and +1.8V to +3.3V digital I/O supply. The MAX19708 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, 11Msps Rx ADC and Dual 10-Bit, 11Msps Tx DAC
Ultra-Low Power
- 36.9mW at f_CLK = 5.12MHz, Fast Mode
- 19.8mW at f_CLK = 5.12MHz, Slow Mode
- Low-Current Standby and Shutdown Modes
Integrated TD-SCDMA Filters with > 55dB Stopband Rejection
Programmable Tx DAC Common-Mode DC Level and I/Q Offset Trim
Excellent Dynamic Performance
- SNR = 55dB at f_IN = 1.87MHz (Rx ADC)
- SFDR = 73dBc 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
- ±0.08° Phase, ±0.02dB Gain (Rx ADC) at
- f_IN = 1.87MHz
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)

	Portable Communication Equipment
	TD-SCDMA Data Cards
	TD-SCDMA Handsets

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^**

MAX19708

55 @ 1.875MHz

73 @ 620kHz

-71 @ 620kHz

-120.6 @ 620kHz

1.8
2.7 to 3.3

$8.35 @ 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.