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Highly integrated AFEs boast high performance, space savings

Posted: 07 Dec 2012     Print Version  Bookmark and Share

Keywords:AFE  optical network  DAC 

Texas Instruments Inc. (TI) introduced two analogue 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 per cent compared to discrete implementations. It integrates a dual DAC, tunable base band filters, IQ modulator and digital quadrature modulation correction circuit. The AFE7070 adds a direct digital synthesiser (DDS) with 32bit numerically controlled oscillator (NCO) and LVDS output buffer.

The devices are tunable from 100MHz to 2700MHz with output power up to 0.3dBm to accommodate a wide range of frequencies and maximise system flexibility. The adjacent channel power ratio is 66dB with 5MHz WCDMA and 61dB with 20MHz LTE at 2.1GHz while using only 325mW, said to be more than 50 per cent lower than discrete designs. Low output noise floor of 156dBm/Hz enables high signal quality.

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 Rs.26,402.12 ($499).

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

Additionally, 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 300MHz to 4800MHz, and can be purchased for Rs.36,984.13 ($699).

The AFE7070 and AFE7071 are both available today in a 7mm x 7mm QFN package. Suggested retail pricing in 1,000-unit quantities is Rs.629.63 ($11.90) for the AFE7071 and Rs.1,256.61 ($23.75) for the AFE7070.

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