10-Bit, 45Msps, Full-Duplex, Analog Front-End

Description

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The MAX19713 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, 45Msps receive (Rx) ADC; dual 10-bit, 45Msps 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 91.8mW at a 45MHz clock frequency.

The Rx ADCs feature 54dB SINAD and 72.2dBc SFDR at 5.5MHz input frequency with a 45MHz 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 ±0.03 phase and ±0.02dB gain.

The Tx DACs feature 70.3dBc SFDR at f_OUT = 2.2MHz and f_CLK = 45MHz. The analog I/Q full-scale output voltage range is ±400mV differential. The output DC common-mode voltage is selectable from 0.71V to 1.06V. The I/Q channel offset is adjustable to optimize radio lineup sideband/carrier suppression. Typical I/Q channel matching is ±0.01dB gain and ±0.05° 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 MAX19713 operates on a single 2.7V to 3.3V analog supply and 1.8V to 3.3V digital I/O supply. The MAX19713 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.

Key Features

• Dual 10-Bit, 45Msps Rx ADC and Dual 10-Bit, 45Msps Tx DAC
• Ultra-Low Power
  • 91.8mW at f_CLK = 45MHz, FD Mode
  • 79.2mW at f_CLK = 45MHz, Slow Rx Mode
  • 49.5mW at f_CLK = 45MHz, 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 = 54.1dB at f_IN = 5.5MHz (Rx ADC)
  • SFDR = 70.3dBc at f_OUT = 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
  • ±0.03° Phase, ±0.02dB Gain (Rx ADC) at f_IN = 5.5MHz
• Multiplexed Parallel Digital I/O
• Serial-Interface Control
• Versatile Power-Control Circuits
  • Shutdown, Standby, Idle, Tx/Rx Disable
• Miniature 56-Pin TQFN Package (7mm x 7mm x 0.8mm)

Applications/Uses

• 802.11a/b/g WLAN
• Portable Communication Equipment
• VoIP Terminals
• WiMAX CPEs