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AFE5804ZCF
8-Channel Analog Front-End for Ultrasound
LNA8 Channels
SPI
IN8... CH1
LVDS
OUT
CH8.
VCA/PGA
Clamp
and
Logic/Controls
CW Switch Matrix (810)´OUT
12-Bit
AFE5804
www.ti.com SBOS442C –JUNE 2008–REVISED OCTOBER 2011
FULLY-INTEGRATED, 8-CHANNEL ANALOG FRONT-END FOR ULTRASOUND
0.89nV/√Hz, 12-Bit, 40MSPS, 101mW/Channel
Checkfor Samples: AFE5804
1FEATURES DESCRIPTIONThe AFE5804isa complete analog front-end device
23• 8-Channel Complete Analog Front-End: specifically designed for ultrasound systems that–
LNA, VCA, PGA, LPF, and ADC require low power and small size.
Mode Control for Power/Noise Optimization: The AFE5804 consistsof eight channels, includinga–
Low Noise (Full-Channel): low-noise amplifier (LNA), voltage-controlled
0.89nV/√Hz (TGC ModeI) attenuator (VCA), programmable gain amplifier
1.23nV/√Hz (TGC ModeII) (PGA), low-pass filter (LPF), and a 12-bit
1.03nV/√Hz (PW Mode) analog-to-digital converter (ADC) with low voltage
differential signaling (LVDS) data outputs.–
Ultra-Low Power:
101mW/Channel (TGC ModeII) The LNA gainis set for 20dB gain and has excellent
65mW/Channel (CW Mode) noise and signal handling capabilities, including fast
overload recovery. VCA gain can vary overa 46dB•
Low-Noise Pre-Amp (LNA): range witha 0Vto 1.2V control voltage commontoall–
0.75nV/√Hz channelsof the AFE5804.–
20dB Fixed Gain The PGA can be programmed for gainsof 20dB,–
280mVPP Linear Input Range 25dB, 27dB, and 30dB. The internal low-pass filter
Variable-Gain Amplifier: can alsobe programmedto 12.5MHzor 17MHz.
Gain Control Range: 46dB The LVDS outputsof the ADC reduce the numberof
PGA Gain Settings: 20dB, 25dB, 27dB, 30dB interface linestoan ASICor FPGA, thereby enabling
the high system integration densities desired for•
Low-Pass Filter: portable systems. The ADC can either be operated–
Selectable BW: 12.5MHz, 17MHz with internal or external references. The ADC also
2nd-Order, Bessel featuresa signal-to-noise ratio (SNR) enhancement
mode that canbe usefulat high gains.•
Gain Error: ±0.5dB
Channel Matching: ±0.25dB The AFE5804 is available ina 15mm× 9mm,
135-ball BGA package that is Pb-free•
Clamping (RoHS-compliant) and green.It is specified for•
Fast Overload Recovery: Two Clock Cycles operation from 0°Cto +85°C.
Converter: Green
