AFEs help to shrink systems for test and measurement, wireless communications and optical networking

December 06, 2012 // By Paul Buckley
Texas Instruments Incorporated has introduced two analog front ends (AFEs) that provide low power, high performance and space savings for test and measurement, wireless communications and optical networking equipment.

The AFE7071 is a complete radio transmitter that reduces board space by up to 80 percent compared to discrete implementations. It integrates a dual digital-to-analog converter (DAC), tunable baseband filters, IQ modulator and digital quadrature modulation correction circuit. The AFE7070 adds a direct digital synthesizer (DDS) with 32-bit numerically controlled oscillator (NCO) and LVDS output buffer.

The AFE7070 and AFE7071 provide a dual 14-bit, 65-MSPS DAC, programmable low-pass filter and RF IQ modulator with an RF output range of 100 MHz to 2700 MHz in a single device simplifies design and reduces board space.

The 7-mm x 7-mm package with multiplexed CMOS input is 80-perent smaller than typical discrete solutions to enable compact or mobile designs, such as small-cell base stations and portable test and measurement equipment.

The devices are tunable from 100 MHz to 2700 MHz with output power up to 0.3 dBm to accommodate a wide range of frequencies and maximize system flexibility.

The adjacent channel power ratio is 66 dB with 5-MHz WCDMA and 61 dB with 20-MHz LTE at 2.1 GHz while using 325 mW, more than 50 percent lower than discrete designs.

An evaluation module is available for both devices. The AFE7070EVM and AFE7071EVM include the CDCM7005 clock jitter cleaner, as well as TI power management devices, such as DC/DC converters and low-noise LDOs, to provide a complete bits-to-RF prototyping and reference design. They can be purchased for $499.

IBIS models for the AFE7070 and AFE7071 are also available to verify board signal integrity requirements.

Designers can use the TSW3065EVM as a flexible local oscillator to drive the AFE7070 and AFE7071. It includes the TRF3765, a PLL/VCO with a tunable range of 300 MHz to 4800 MHz, and can be purchased for $699.

Availability and Pricing

The AFE7070 and AFE7071 are both available in a 7-mm by 7-mm QFN package. Suggested retail pricing in 1,000-unit quantities is $11.90 for the AFE7071 and $23.75 for the