1FEATURES
• 8-Channel Complete Analog Front-End
– LNA, VCAT, PGA, LPF, ADC
• Programmable Gain Low-Noise Amplifier
(LNA)
– 24/18/12 dB Gain
– 0.25/0.5/1 VPP Linear Input Range
– 0.63/0.7/0.9 nV/rtHz Input Referred Noise
– Programmable Active Termination
• 40 dB Low Noise Voltage Controlled
Attenuator (VCAT)
• 24/30 dB Programmable Gain Amplifier (PGA)
• 3rd Order Linear Phase Low-Pass Filter (LPF)
– 10, 15, 20, 30 MHz
• 14-bit Analog to Digital Converter (ADC)
– 77 dBFS SNR at 65 MSPS
– LVDS Outputs
• Noise/Power Optimizations (Full Chain)
– 158 mW/CH at 0.75 nV/rtHz, 65 MSPS
– 101 mW/CH at 1.1 nV/rtHz, 40 MSPS
• Excellent Device-to-Device Gain Matching
– ±0.5 dB (Typical) and ±0.9 dB (Max)
• Low Harmonic Distortion
• Fast and Consistent Overload Recovery
• Small Package: 15 mm x 9 mm, 135-BGA

APPLICATIONS
• Medical Ultrasound Imaging
• Nondestructive Evaluation Equipments

DESCRIPTION
The AFE5803 is a highly integrated Analog Front-End
(AFE) solution specifically designed for ultrasound
systems in which high performance and small size
are required. The AFE5803 integrates a complete
time-gain-control (TGC) imaging path. It also enables
users to select one of various power/noise
combinations to optimize system performance.
Therefore, the AFE5803 is a suitable ultrasound
analog front end solution for portable systems.
The AFE5803 contains eight channels of voltage
controlled amplifier (VCA), 14/12-bit Analog-to-Digital
Converter (ADC). The VCA includes Low noise
Amplifier (LNA), Voltage controlled Attenuator
(VCAT), Programmable Gain Amplifier (PGA), and
Low-Pass Filter (LPF). The LNA gain is
programmable to support 250 mVPP to 1 VPP input
signals. Programmable active termination is also
supported by the LNA. The ultra-low noise VCAT
provides an attenuation control range of 40 dB and
improves overall low gain SNR which benefits
harmonic imaging and near field imaging. The PGA
provides gain options of 24 dB and 30 dB. Before the
ADC, a LPF can be configured as 10 MHz, 15 MHz,
20 MHz or 30 MHz to support ultrasound applications
with different frequencies. The high-performance
14bit/65 MSPS ADC in the AFE5803 achieves
77dBFS SNR. It ensures excellent SNR at low chain
gain. The ADC’s LVDS outputs enable flexible system
integration desired for miniaturized systems.
The AFE5803 is available in a 15mm × 9mm, 135-pin
BGA package and it is specified for operation from
0°C to 85°C. It is also pin-to-pin compatible to the
AFE5807, AFE5808 and AFE5808A.