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MAX19712
10-Bit, 22Msps, Full-Duplex, Analog Front-End
Ultra-Low Power AFE with Integrated Tx DACs, Rx ADCs, and Auxiliary Control Data Converters
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Status
All versions are No Longer Available. See Ordering Information for recommended replacements.
Description
The MAX19712 is an ultra-low-power, highly integrated mixed-signal analog front-end (AFE) ideal for wideband communication applications operating in full-duplex (FD) mode. Optimized for high dynamic performance and 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 FD mode is 50.4mW at a 22MHz clock frequency.
The Rx ADCs feature 54.7dB SINAD and 75.6dBc SFDR at 5.5MHz input frequency with a 22MHz clock frequency. The analog I/Q input amplifiers are fully differential and accept 1.024VP-P full-scale signals. Typical I/Q channel matching is ±0.01° phase and ±0.01dB gain.
The Tx DACs feature 72.9dBc SFDR at fOUT = 2.2MHz and fCLK = 22MHz. The analog I-Q full-scale output voltage range is ±400mV differential. The output DC common-mode voltage is from 0.89V to 1.36V. The I/Q channel offset is adjustable to optimize radio lineup sideband/
carrier suppression. Typical I-Q channel matching is ±0.01dB gain and ±0.1° phase.
Two independent 10-bit parallel, high-speed digital buses used by the Rx ADC and Tx DAC allow full-duplex operation for frequency-division duplex applications. The Rx ADC and Tx DAC can be disabled independently to optimize power management. A 3-wire serial interface controls power-management modes, the aux-DAC channels, and the aux-ADC channels.
The MAX19712 operates on a single 2.7V to 3.3V analog supply and 1.8V to 3.3V digital I/O supply. The MAX19712 is specified for the extended (-40°C to +85°C) temperature range and is available in a 56-pin, thin QFN package. The Selector Guide at the end of the data sheet lists other pin-compatible versions in this AFE family. For time-division duplex (TDD) applications, refer to the MAX19705–MAX19708 AFE family of products.
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Data Sheet
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An evaluation kit is available: MAX19710EVCMODU, MAX19710EVKIT, MAX19711EVCMODU, MAX19711EVKIT, MAX19712EVCMODU, MAX19712EVKIT, MAX19713EVCMODU, MAX19713EVKIT
Key Features
- Dual 10-Bit, 22Msps Rx ADC and Dual 10-Bit, 22Msps Tx DAC
- UItra-Low Power
- 50.4mW at fCLK = 22MHz, FD Mode
- 39.9mW at fCLK = 22MHz, Slow Rx Mode
- 33.9mW at fCLK = 22MHz, Slow Tx Mode
- Low-Current Standby and Shutdown Modes
- Programmable Tx DAC Common-Mode DC Level and I/Q Offset Trim
- Excellent Dynamic Performance
- SNR = 54.8dB at fIN = 5.5MHz (Rx ADC)
- SFDR = 72.9dBc at fOUT = 2.2MHz (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, ±0.01dB Gain (Rx ADC) at fIN = 5.5MHz
- Multiplexed Parallel Digital I/O
- Serial-Interface Control
- Versatile Power-Control Circuits
- Shutdown, Standby, Idle, Tx/Rx Disable
- Miniature 56-Pin Thin QFN Package (7mm x 7mm x 0.8mm)
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Applications/Uses
- 802.11a/b/g WLAN
- Portable Communication Equipment
- RFID Readers
- VoIP Terminals
- WCDMA Handsets
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Diagram
Functional Diagram
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Information Index
Document Ref.: 19-0528
Rev 0;
2006-05-24
This page last modified: 2009-12-10
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