AFE5818 Series

16-Channel Ultrasound Analog Front End With Passive CW Mixer, 0.75 nV/rtHz, 124mW/Channel

Catalog

16-Channel Ultrasound Analog Front End With Passive CW Mixer, 0.75 nV/rtHz, 124mW/Channel

Part	Supplied Contents	Type	For Use With/Related Products	Number of Channels	Voltage - Supply, Analog	Voltage - Supply, Analog [Min]	Voltage - Supply, Analog [Max]	Supplier Device Package	Package / Case	Number of Bits	Voltage - Supply, Digital [Min]	Voltage - Supply, Digital [Max]	Power (Watts)	Mounting Type
Texas Instruments AFE5818EVM	Board(s) Cable(s)	Front End	AFE5818
Texas Instruments AFE5818ZBV				16	5 V	1.7 V 3.15 V	1.9 V 3.6 V	289-NFBGA (15x15)	289-FBGA	14	1.15 V 1.7 V	1.25 V 1.9 V	140 mW	Surface Mount

Catalog

16-Channel Ultrasound Analog Front End With Passive CW Mixer, 0.75 nV/rtHz, 124mW/Channel

Key Features

• 16-channel, complete analog front-end:LNA, VCAT, PGA, LPF, ADC, and CW mixerLNA with programmable gain:Gain: 24dB, 18dB, and 12dBLinear input range: 0.25VPP, 0.5VPP, and 1VPPInput-referred noise: 0.63nV/√Hz, 0.7nV/√Hz, and 0.9nV/√HzProgrammable active terminationVoltage-controlled attenuator (VCAT): 40dBProgrammable gain amplifier (PGA): 24dB and 30dBTotal signal chain gain: 54dB (maximum)3rd-order, linear-phase LPF:10MHz, 15MHz, 20MHz, 30MHz, 35MHz, and 50MHzAnalog-to-digital converter (ADC):14-bit ADC: 75dBFS SNR at 65 MSPS12-bit ADC: 72dBFS SNR at 80 MSPSLVDS interface maximum speed of 1GbpsNoise and power optimizations (full-channel):140mW/Ch at 0.75nV/√Hz, 65 MSPS91.5mW/Ch at 1.1nV/√Hz, 40 MSPS80mW/Ch at CW modeExcellent device-to-device gain matching:±0.5dB (typical) and ±1.1dB (maximum)Low harmonic distortionFast and consistent overload recoveryPassive mixer for CWD:Low close-in phase noise: –156dBc/Hz at 1kHz off 2.5MHz carrierPhase resolution: λ / 16Supports 16X, 8X, 4X, and 1X CW clocks12dB suppression on 3rd and 5th harmonicsCWD high-pass filter rejects undesired low-frequency signals < 1kHzSmall package: 15mm × 15mm NFBGA-28916-channel, complete analog front-end:LNA, VCAT, PGA, LPF, ADC, and CW mixerLNA with programmable gain:Gain: 24dB, 18dB, and 12dBLinear input range: 0.25VPP, 0.5VPP, and 1VPPInput-referred noise: 0.63nV/√Hz, 0.7nV/√Hz, and 0.9nV/√HzProgrammable active terminationVoltage-controlled attenuator (VCAT): 40dBProgrammable gain amplifier (PGA): 24dB and 30dBTotal signal chain gain: 54dB (maximum)3rd-order, linear-phase LPF:10MHz, 15MHz, 20MHz, 30MHz, 35MHz, and 50MHzAnalog-to-digital converter (ADC):14-bit ADC: 75dBFS SNR at 65 MSPS12-bit ADC: 72dBFS SNR at 80 MSPSLVDS interface maximum speed of 1GbpsNoise and power optimizations (full-channel):140mW/Ch at 0.75nV/√Hz, 65 MSPS91.5mW/Ch at 1.1nV/√Hz, 40 MSPS80mW/Ch at CW modeExcellent device-to-device gain matching:±0.5dB (typical) and ±1.1dB (maximum)Low harmonic distortionFast and consistent overload recoveryPassive mixer for CWD:Low close-in phase noise: –156dBc/Hz at 1kHz off 2.5MHz carrierPhase resolution: λ / 16Supports 16X, 8X, 4X, and 1X CW clocks12dB suppression on 3rd and 5th harmonicsCWD high-pass filter rejects undesired low-frequency signals < 1kHzSmall package: 15mm × 15mm NFBGA-289

Description

The AFE5818 is a highly-integrated, analog front-end (AFE) solution specifically designed for ultrasound systems where high performance and small size are required. The device integrates a complete time-gain-control (TGC) imaging path and a continuous wave Doppler (CWD) path. The device also allows various power and noise combinations to be selected to optimize system performance. Therefore, the AFE5818 is a suitable ultrasound AFE solution for high-end and portable systems The AFE5818 has a total of 16 channels, with each channel consisting of a voltage-controlled amplifier (VCA), a simultaneous sampling 14-bit and 12-bit analog-to-digital converter (ADC), and a continuous wave (CW) mixer. The VCA includes a low-noise amplifier (LNA), a voltage-controlled attenuator (VCAT), a programmable gain amplifier (PGA), and a low-pass filter (LPF). LNA gain is programmable and supports 250mVPP to 1VPP input signals and programmable active termination. The ultra-low noise VCAT provides an attenuation control range of 40dB and improves overall low-gain SNR, which benefits harmonic and near-field imaging. The PGA provides gain options of 24dB and 30dB. In front of the ADC, an LPF can be configured at 10MHz, 15MHz, 20MHz, 30MHz, 35MHz, or 50MHz to support ultrasound applications with different frequencies. The AFE5818 also integrates a low-power passive mixer and a low-noise summing amplifier to create an on-chip CWD beamformer. 16 selectable phase delays can be applied to each analog input signal. Furthermore, a unique third- and fifth-order harmonic suppression filter is implemented to enhance CW sensitivity The high-performance, 14-bit ADC achieves 75dBFS SNR. This ADC ensures excellent SNR at low-chain gain. The device can operate at maximum speeds of 65 MSPS and 80 MSPS, providing a 14-bit and a 12-bit output, respectively. The ADC low-voltage differential signaling (LVDS) outputs enable a flexible system integration that is desirable for miniaturized systems. The AFE5818 also allows various power and noise combinations to be selected to optimize system performance. Therefore, the AFE5818 is a suitable ultrasound AFE solution for both high-end and portable systems. The AFE5818 is available in a 15mm × 15mm NFBGA-289 package (ZBV package, S-PBGA-N289) and are specified for operation from –40°C to 85°C. The devices are also pin-to-pin compatible with theAFE5816device family. The AFE5818 is a highly-integrated, analog front-end (AFE) solution specifically designed for ultrasound systems where high performance and small size are required. The device integrates a complete time-gain-control (TGC) imaging path and a continuous wave Doppler (CWD) path. The device also allows various power and noise combinations to be selected to optimize system performance. Therefore, the AFE5818 is a suitable ultrasound AFE solution for high-end and portable systems The AFE5818 has a total of 16 channels, with each channel consisting of a voltage-controlled amplifier (VCA), a simultaneous sampling 14-bit and 12-bit analog-to-digital converter (ADC), and a continuous wave (CW) mixer. The VCA includes a low-noise amplifier (LNA), a voltage-controlled attenuator (VCAT), a programmable gain amplifier (PGA), and a low-pass filter (LPF). LNA gain is programmable and supports 250mVPP to 1VPP input signals and programmable active termination. The ultra-low noise VCAT provides an attenuation control range of 40dB and improves overall low-gain SNR, which benefits harmonic and near-field imaging. The PGA provides gain options of 24dB and 30dB. In front of the ADC, an LPF can be configured at 10MHz, 15MHz, 20MHz, 30MHz, 35MHz, or 50MHz to support ultrasound applications with different frequencies. The AFE5818 also integrates a low-power passive mixer and a low-noise summing amplifier to create an on-chip CWD beamformer. 16 selectable phase delays can be applied to each analog input signal. Furthermore, a unique third- and fifth-order harmonic suppression filter is implemented to enhance CW sensitivity The high-performance, 14-bit ADC achieves 75dBFS SNR. This ADC ensures excellent SNR at low-chain gain. The device can operate at maximum speeds of 65 MSPS and 80 MSPS, providing a 14-bit and a 12-bit output, respectively. The ADC low-voltage differential signaling (LVDS) outputs enable a flexible system integration that is desirable for miniaturized systems. The AFE5818 also allows various power and noise combinations to be selected to optimize system performance. Therefore, the AFE5818 is a suitable ultrasound AFE solution for both high-end and portable systems. The AFE5818 is available in a 15mm × 15mm NFBGA-289 package (ZBV package, S-PBGA-N289) and are specified for operation from –40°C to 85°C. The devices are also pin-to-pin compatible with theAFE5816device family.