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MAX19700：7.5Msps, Ultra-Low-Power Analog Front-End

The MAX19700 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 MAX19700 integrates a dual 10-bit, 7.5Msps receive (Rx) ADC, dual 10-bit, 7.5Msps transmit (Tx) DAC with TD-SCDMA baseband filters, and three fast-settling 12-bit aux-DAC channels for ancillary RF front-end control. The typical operating power in Tx-Rx FAST mode is 36.3mW at a 5.12Msps clock frequency. The Rx ADCs feature 54.9dB SINAD and 78dBc SFDR at a 1.87MHz input frequency with a 7.5Msps sample frequency. The analog I/Q input amplifiers are fully differential and accept 1.024VP-P full-scale signals. Typical I/Q channel matching is ±0.22° phase and ±0.02dB gain. The Tx DACs with TD-SCDMA lowpass filters feature -3dB cutoff frequency of 1.27MHz and >55dB stopband rejection at fIMAGE = 4.32MHz. The analog I/Q full-scale output voltage range is selectable at ±410mV or ±500mV. The output common-mode voltage is selectable from 0.9V to 1.4V and the I/Q channel offset is adjustable. The typical I/Q channel matching is ±0.05dB gain and ±0.16° 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 and the aux-DAC channels. The MAX19700 operates on a single +2.7V to +3.3V analog supply and +1.8V to +3.3V digital I/O supply. The MAX19700 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 Dual 10-Bit Rx ADC and Dual 10-Bit Tx DAC Ultra-Low Power 36.3mW at fCLK = 5.12Msps, Fast Mode 19.8mW at fCLK = 5.12Msps, Slow Mode Low Standby and Shutdown Current Integrated TD-SCDMA Filters with >55dB Stopband Rejection Excellent Dynamic Performance SINAD = 54.9dB at fIN = 1.87MHz (Rx ADC) SFDR = 76.5dBc at fOUT = 620kHz (Tx DAC) Excellent Gain/Phase Match ±0.22° Phase, ±0.02dB Gain (Rx ADC) at fIN = 1.87MHz at -0.5dBFS Three 12-Bit, 1µs Aux-DACs Single-Supply Operation 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)

MAX19700: Functional Diagram Applications/Uses Portable Communications Equipment TD-SCDMA Data Cards TD-SCDMA Handsets

DataSheet

Parametrics

Design kits & evaluation modules

• MAX19700EVCMOD2
• MAX19700EVKIT

Quality and Environmental Data

• MAX19700.pdf

Related Products

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• MAX19705：10-bit, 7.5Msps, Ultra-Low-Power Analog Front-End
• MAX19708：10-bit, 11Msps, Ultra-Low-Power Analog Front-End

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