Date: 28/09/2010

Analog front end chips from TI enable blood flow velocity display in ultrasound images

Texas Instruments (TI) has released two new fully integrated analog front ends (AFEs) with a continuous wave (CW) Doppler mixer for mid- to high-end, Spectral Doppler ultrasound equipment. The AFE5807 and AFE5808 address have a noise performance at 0.75 nV/rtHz. The integrated CW mode measures and displays blood flow velocity in ultrasound images. The new devices are 25 percent smaller than competing solutions according to TI.

The key features of AFE5807 and the AFE5808 include:

--Integrated CW Doppler mixer and summing amplifier with a close-in phase noise better than -155 dBc/Hz at 1 KHz off a 2.5 MHz carrier.
--AFE5807 is a low-power solution with 88 mW/Ch at 1.1 nV/rtHz, 40 MSPS, 12-bit sampling.
--AFE5808 is a high-performance solution with low-noise optimization of 0.75 nV/rtHz, 149 mW/ch, 65 MSPS and a 14-bit analog-to-digital converter (ADC) with 77 dBFS SNR (signal-to-noise ratio).
--Both integrate eight channels of the following components:
Low-noise amplifier (LNA) with 24/18/12 dB gain settings to enable 0.25/0.5/1 Vpp linear input range. 50, 100, 200 or 400 ohm active termination supports a range of input amplitudes for different class of transducers.
Voltage controlled attenuator (VCA) and programmable gain amplifier (PGA) with a total max gain of 54 dB for superior dynamic range.
3rd order linear phase low-pass filter (LPF) with selectable bandwidth of 10, 15, 20, and 30 MHz.
12- and 14-bit ADC with LVDS output up to 65 MSPS.
Programmable modes for various imaging modes.

AFE5807 and AFE5808 extend TI's AFE58xx family of fully integrated ultrasound analog front ends, including the AFE5805 and AFE5804 for portable to mid-range ultrasound and the AFE5801 and AFE5851 for handheld, ultra-portable ultrasound. All AFE58xx devices are complemented on the transmit side by TI's TX810 T/R switch and join TI's full portfolio of embedded processing, analog and power management solutions for ultrasound applications.

Package: 9-mm x 15-mm, 135-pin BGA.

Price:
AFE5807: US$62 for 1K pieces.
AFE5808: US$68 for 1K pieces.

Availability: Sampling now