16-channel ultrasound AFEs enable efficient system designs

November 08, 2015 // By Graham Prophet
Texas Instruments' AFE5818 and AFE5816 families are presented as the first 16-channel ultrasound analogue front ends (AFEs), that also integrate a range of features to maximise image quality and performance while minimising power consumption and system cost, enabling maximum system efficiency

These families offer multiple versions with and without a demodulation block and JESD204B interface option, which simplifies board layout and provides cost savings. The new families also offer low power consumption for the noise performance achieved, enabling portable solutions that offer better imaging performance without increasing power.

AFE5818 and AFE5816 offer power consumption as low as 94 mW and 52 mW per channel, respectively, presented as a 33% improvement. They include a 5-Gbps JESD204B serial interface, reducing ultrasound system data I/O routing by as much as 80% compared to other data interface standards and enabling a data rate of up to 6.4 Gbps. This standard interface creates a seamless connection to high-performance processors such as TI’s 66AK2L06 multicore processor.

AFE58JD16 and AFE5816 include a DTGC (Digital time gain compensation) engine with 0.125-dB resolution, which reduces noise and power consumption. DTGC also reduces the need for external components, compared to traditional analogue time gain compensation. The also have an on-chip digital demodulator, which conditions 16 channels of data from RF to a baseband frequency. This reduces the load on the system processing engine to enable lower latency and higher image quality.

Complementing the AFE5818 and AFE5816 families is TI’s ADS52J90, a 16-channel high-speed analogue-to-digital converter (ADC) that can be configured for up to 32 inputs, for ultrasound receiver designs that require greater front end design flexibility. The ADC also offers the on-chip digital demodulator for reducing processor or FPGA costs, as well as a low-voltage differential signaling (LVDS) or JESD204B serial interface for faster data rates.

TI has evaluation modules (EVMs) for the AFE5818, AFE5816 and ADS52J90 families; AFE5818EVM, AFE58JD18EVM and AFE58JD16EVM are priced at $599, and the ADS52J90EVM is priced at $1,249.

The AFE5818/AFE58JD18 and AFE5816/AFE58JD16 devices offer IBIS models, while the ADS52J90 is supported by an anti-aliasing calculation tool for ADCs as well as an operational amplifier to ADC circuit topology calculator, which are available on www.ti.com