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.