The AFE5816 is an integrated analog front-end (AFE) optimized for medical ultrasound application. The

AFE5816 is a multichip module (MCM) device with two dies: VCA and ADC_CONV. Each die has total of

16 channels.

Each channel in the VCA die can be configured in two modes: time gain compensation (TGC) mode and

continuous wave (CW) mode. In TGC mode, each channel includes an input attenuator (ATTEN), a low-noise

amplifier (LNA) with variable-gain, and a third-order, low-pass filter (LPF). The attenuator supports an attenuation

range of 8dB to 0dB, and the LNA supports gain ranges from 14dB to 45dB. The LPF cutoff frequency can be

configured at 10MHz, 15MHz, 20MHz, or 25MHz to support ultrasound applications with different frequencies.

In CW mode, each channel includes an LNA with a fixed gain of 18dB, and a low-power passive mixer with

16 selectable phase delays. Different phase delays can be applied to each analog input signal to perform an

on-chip beamforming operation. A harmonic filter in the CW mixer suppresses the third and fifth harmonic to

enhance the sensitivity of the CW Doppler measurement. CW mode supports three clock modes: 16X, 8X, and

4X.

Each channel of the ADC_CONV die has a high-performance analog-to-digital converter (ADC) with a

programmable resolution of 14 bits or 12 bits. The ADC achieves 75dBFS signal-to-noise ratio (SNR) in 14-bit

mode, and 72dBFS SNR in 12-bit mode. This ADC provides excellent SNR at low-channel gain. The devices

operate at maximum speeds of 65 MSPS and 80 MSPS, providing 14-bit and 12-bit output, respectively. The

ADC is designed to scale power with sampling rate. The output interface of the ADC is a low-voltage differential

signaling (LVDS) interface that can easily interface with low-cost field-programmable gate arrays (FPGAs).

The AFE5816 also allows various power and noise combinations to be selected for optimizing system

performance. Therefore, these devices are suitable ultrasound AFE solutions for systems with strict battery-life

requirements. The AFE5816 is available in a 15mm × 15mm NFBGA-289 package (ZAV package, S-PBGA-

N289) and is specified for operation from –40°C to +85°C. The device is also pin-to-pin compatible with the

AFE5818 family.

12-, 14-Bit

ADC

SPI Logic

16-Phase

Generator

CW Mixer

DTGC Engine

SPI OUT

TGC Control

Signals

3

rd-Order LPF with

10 MHz, 15 MHz,

20 MHz, and 25

MHz

LVDS

Reference

1 of 16 Channels

SPI IN

CW Current Outputs

LNA

14 dB to

45 dB

ATTEN

Digital

Processing

(Optional)

16 x 16 Cross-

Point Switch

CW Clocks

INP

INM

Simplified Block Diagram

AFE5816

SBASB11 – MARCH 2024

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