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AFE5805ZCF
8-Channel Analog Front-End for Ultrasound
LNA8 Channels
SPI
IN1
IN8... CH1
LVDS
OUT
CH8.
Logic/Controls
Reference
CW Switch Matrix (8
12-Bit
ADC
AFE5805
www.ti.com SBOS421D –MARCH 2008–REVISED MARCH 2010
FULLY-INTEGRATED, 8-CHANNEL ANALOG FRONT-END FOR ULTRASOUND
0.85nV/√Hz, 12-Bit, 50MSPS, 122mW/Channel
Checkfor Samples: AFE5805
1FEATURES DESCRIPTION
23• 8-Channel Complete Analog Front-End: The AFE5805isa complete analog front-end device
specifically designed for ultrasound systems that
– LNA, VCA, PGA, LPF, and ADCrequire low power and small size.
• Ultra-Low, Full-Channel Noise:The AFE5805 consistsof eight channels, includinga
– 0.85nV/√Hz (TGC)low-noise amplifier (LNA), voltage-controlled
– 1.1nV/√Hz (CW) attenuator (VCA), programmable gain amplifier
• Low Power: (PGA), low-pass filter (LPF), and a 12-bit
analog-to-digital converter (ADC) with low voltage
– 122mW/Channel (40MSPS)differential signaling (LVDS) data outputs.
– 74mW/Channel (CW Mode)The LNA gainis set for 20dB gain, and has excellent
• Low-Noise Pre-Amp (LNA):noise and signal handling capabilities, including fast
– 0.75nV/√Hz overload recovery. VCA gain can vary overa 46dB
– 20dB Fixed Gain range witha 0Vto 1.2V control voltage commontoall
channelsof the AFE5805.
– 250mVPP Linear Input Range Variable-Gain Amplifier: The PGA can be programmed for gainsof 20dB,
25dB, 27dB, and 30dB. The internal low-pass filter
– Gain Control Range: 46dBcan alsobe programmedto 10MHzor 15MHz.
• PGA Gain Settings: 20dB, 25dB, 27dB, 30dBThe LVDS outputsof the ADC reduce the numberof
• Low-Pass Filter: interface linestoan ASICor FPGA, thereby enabling
– Selectable BW: 10MHz, 15MHz the high system integration densities desired for
– 2nd-Order portable systems. The ADC can either be operated
with internal or external references. The ADC also
• Gain Error: ±0.5dBfeaturesa signal-to-noise ratio (SNR) enhancement
• Channel Matching: ±0.25dB mode that canbe usefulat high gains.
• Distortion, HD2: –65dBFSat 5MHz The AFE5805 is available ina 15mm× 9mm,
• Clamping Control 135-ball BGA package that is Pb-free
• Fast Overload Recovery: Two Clock Cycles (RoHS-compliant) and green.It is specified for
operation from 0°Cto +70°C.
Converter: Green
