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AFE offers fastest, highest performance

Suited for femtocell base stations and portable SDR applications, the low-power 12-bit AFE7225 analog-front-end (AFE) integrates a dual 125-Msample/s A/D and dual 250-Msample/s D/A converter. It is claimed to operate 25% faster than the competition, while increasing the SNR by 2 dB and providing up to five times the DAC output current.

AFE offers fastest, highest performance

The dual ADC achieves 70-dB SNR, while the dual DAC achieves an adjacent channel leakage ratio of 75 dB with a 3G W-CDMA cellular signal. The part consumes only 12 mW of power in deep-sleep mode with a wakeup of only 13 µs, or as little as 120 mW in light-sleep mode with 5-µs wakeup time.

In addition to the AFE7225, the 12-bit AFE7222 is available for lower bandwidth, power-sensitive applications. It integrates a dual 65-Msample/s ADC and dual 130-Msample/s DAC and uses only 398 mW in full-duplex or 212 mW in half-duplex receive mode at full speed.

Both feature independent transmit and receive digital block up- and down-conversion with 2x to 4x interpolation, 2x decimation, coarse and 32-bit NCO frequency mixers; digital correction of gain, phase and offset for quadrature modulation receive and/or transmit; and a peak/rms power meter. (Ea/1,000: AFE7225, $29.50; AFE7222, $19.50 — available now.)

By Christina Nickolas

Texas Instruments , Dallas , TX
Information 800-477-8924
www.ti.com

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