1 Features

• 16-channel, complete analog front-end:

– LNA, VCAT, PGA, LPF, ADC, and CW mixer

• LNA with programmable gain:

– Gain: 24dB, 18dB, and 12dB

– Linear input range:

0.25VPP, 0.5VPP, and 1VPP

– Input-referred noise:

0.63nV/√Hz, 0.7nV/√Hz, and 0.9nV/√Hz

– Programmable active termination

• Voltage-controlled attenuator (VCAT): 40dB

• Programmable gain amplifier (PGA):

24dB and 30dB

• Total signal chain gain: 54dB (maximum)

• 3rd-order, linear-phase LPF:

– 10MHz, 15MHz, 20MHz, 30MHz, 35MHz, and

50MHz

• Analog-to-digital converter (ADC):

– 14-bit ADC: 75dBFS SNR at 65 MSPS

– 12-bit ADC: 72dBFS SNR at 80 MSPS

• LVDS interface maximum speed of 1Gbps

• Noise and power optimizations (full-channel):

– 140mW/Ch at 0.75nV/√Hz, 65 MSPS

– 91.5mW/Ch at 1.1nV/√Hz, 40 MSPS

– 80mW/Ch at CW mode

• Excellent device-to-device gain matching:

– ±0.5dB (typical) and ±1.1dB (maximum)

• Low harmonic distortion

• Fast and consistent overload recovery

• Passive mixer for CWD:

– Low close-in phase noise:

–156dBc/Hz at 1kHz off 2.5MHz carrier

– Phase resolution: λ / 16

– Supports 16X, 8X, 4X, and 1X CW clocks

– 12dB suppression on 3rd and 5th harmonics

– CWD high-pass filter rejects undesired lowfrequency

signals < 1kHz

• Small package: 15mm × 15mm NFBGA-289

2 Applications

• Medical Ultrasound Imaging

• Nondestructive Evaluation Equipment

• Sonar Imaging Equipment

• Multichannel, High-Speed Data Acquisition

3 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 timegain-

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