AFE5808A Datasheet, PDF (1/66 Pages) Texas Instruments – Fully Integrated, 8-Channel Ultrasound Analog Front End with Passive CW Mixer, 0.75 nV/rtHz, 14/12-Bit, 65 MSPS, 158 mW/CH

AFE5808A
www.ti.com
SLOS729B – OCTOBER 2011 – REVISED APRIL 2012
Fully Integrated, 8-Channel Ultrasound Analog Front End with
Passive CW Mixer, 0.75 nV/rtHz, 14/12-Bit, 65 MSPS, 158 mW/CH
Check for Samples: AFE5808A
FEATURES
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• 8-Channel Complete Analog Front-End
– LNA, VCAT, PGA, LPF, ADC, and CW Mixer
• Programmable Gain Low-Noise Amplifier
(LNA)
– 24/18/12 dB Gain
– 0.25/0.5/1 V_PP 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)
• 3^rd 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
– 80 mW/CH at CW Mode
• Excellent Device-to-Device Gain Matching
– ±0.5 dB (Typical) and ±0.9 dB (Max)
• Low Harmonic Distortion
• Fast and Consistent Overload Recovery
• Passive Mixer for Continuous Wave
Doppler(CWD)
– Low Close-in Phase Noise –156 dBc/Hz at 1
KHz off 2.5 MHz Carrier
– Phase Resolution of 1/16λ
– Support 16X, 8X, 4X and 1X CW Clocks
– 12dB Suppression on 3^rd and 5^th Harmonics
– Flexible Input Clocks
• Small Package: 15 mm x 9 mm, 135-BGA
APPLICATIONS
• Medical Ultrasound Imaging
• Nondestructive Evaluation Equipments
DESCRIPTION
The AFE5808A is a highly integrated Analog Front-
End (AFE) solution specifically designed for
ultrasound systems in which high performance and
small size are required. The AFE5808A integrates a
complete time-gain-control (TGC) imaging path and a
continuous wave Doppler (CWD) path. It also enables
users to select one of various power/noise
combinations to optimize system performance.
Therefore, the AFE5808A is a suitable ultrasound
analog front end solution not only for high-end
systems, but also for portable ones.
The AFE5808A contains eight channels of voltage
controlled amplifier (VCA), 14/12-bit Analog-to-Digital
Converter (ADC), and CW mixer. 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 mV_PP to 1 V_PP 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 AFE5808A achieves
77dBFS SNR. It ensures excellent SNR at low chain
gain. The ADC’s LVDS outputs enable flexible system
integration desired for miniaturized systems.
NOTE
AFE5808A is an enhanced version of AFE5808 and it is recommended for new designs.
Compared to AFE5808, it expands the cut-off frequency range of the digital high pass
filter; increases the handling capability of extreme overload signals; lowers the correlated
noise significantly when high impedance source appears.
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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