TI AFE58JD32ZBV

The AFE58JD32 is a highly integrated analog front-end solution designed for ultrasound systems requiring high performance, low power consumption, and a compact form factor. The AFE58JD32 is an integrated AFE optimized for medical ultrasound applications. The device is implemented as a multi-chip module (MCM) containing three dies: two VCA dies and one ADC die. Each VCA die provides 16 channels, and the ADC die converts all 32 channels. Each channel in the VCA die is configurable in one of two modes: time gain compensation (TGC) mode or continuous wave (CW) mode. In TGC mode, each channel includes an input attenuator (ATTEN), an LNA with variable gain, and a third-order low-pass filter (LPF). The attenuator supports an attenuation range of 0dB to 8dB, and the LNA supports a gain range of 20dB to 51dB. The LPF cutoff frequency is configurable to 5MHz, 7.5MHz, 10MHz, or 12.5MHz to support ultrasound applications across different frequency ranges. 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. On-chip beamforming is performed by applying different phase delays to each analog input signal. A harmonic filter in the CW mixer suppresses third- and fifth-order harmonics, enhancing the sensitivity of CW Doppler measurements. The ADC die contains 16 physical ADCs. Each ADC converts two sets of outputs, one from each corresponding VCA die. The ADC die is configurable to operate at either 12-bit or 10-bit resolution. ADC resolution can be traded off against conversion rate, with maximum speeds of 80MSPS at 12-bit resolution and 100MSPS at 10-bit resolution. ADC power consumption scales with the sampling rate. The ADC output interface uses LVDS signaling for easy interfacing with low-cost FPGAs. The AFE58JD32 includes an optional digital demodulator and a JESD204B data packing block. A digital in-phase and quadrature (I/Q) demodulator with a programmable decimation filter accelerates the execution of computationally intensive algorithms at low power. The device also supports an optional JESD204B interface at rates up to 5Gbps, further simplifying board routing in high-channel-count systems. The AFE58JD32 also supports various power and noise configuration options to optimize system performance, making it a highly suitable ultrasound AFE solution for systems with stringent battery life requirements.

• 32-channel AFE for standard ultrasound applications
• Input attenuator, LNA, LPF, ADC, digital I/Q demodulator, and CW mixer
• Digital time gain compensation (DTGC) total gain range: 12dB to 51dB
• Linear input range: 800mV_PP
• Input attenuator with DTGC: 8dB to 0dB attenuation, 0.125dB step size
• Supported matching impedance: 50Ω to 800Ω source impedance
• LNA with DTGC: –151dBc/Hz low near-end phase noise at 1kHz offset from 2.5MHz carrier
• Phase resolution: λ/16
• 16X CW clock support
• 12dB suppression of 3rd and 5th order harmonics
• Digital I/Q demodulator post-ADC: decimation filter M=1 to 63
• Reduced data throughput after decimation
• On-chip RAM with 32 preset configuration profiles
• LVDS interface up to 1Gbps
• 3rd-order linear phase LPF: 5MHz, 7.5MHz, 10MHz, and 12.5MHz
• 5Gbps JESD interface: JESD204B subclass 0, 1, and 2
• 2, 4, or 8 channels per JESD lane
• Compact package: 15mm×15mm NFBGA-289

• Medical ultrasound imaging
• Non-destructive testing equipment
• Sonar imaging systems
• Multi-channel high-speed data acquisition