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
Applications/Uses
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)
Portable Communications Equipment
TD-SCDMA Data Cards
TD-SCDMA Handsets
Key Specifications:
Fast CODECs / Analog Front-End (AFE)
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.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices:
1-4
of
4
MAX19700
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TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
Temp
RoHS/Lead-Free? Materials Analysis
MAX19700ETM
THIN QFN;48 pin;
Dwg: 21-0144 (PDF)
Use pkgcode/variation: T4877-4*
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