AFE5808_14 Datasheet, PDF (1/76 Pages) Texas Instruments – Fully Integrated, 8-Channel Ultrasound Analog Front End With Passive CW Mixer, 0.75 nV/rtHz, 14/12-Bit, 65 MSPS, 153 mW/CH

AFE5808
www.ti.com
SLOS688D – SEPTEMBER 2010 – REVISED JANUARY 2014
Fully Integrated, 8-Channel Ultrasound Analog Front End With Passive CW Mixer, 0.75
nV/rtHz, 14/12-Bit, 65 MSPS, 153 mW/CH
Check for Samples: AFE5808
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)
– 153 mW/CH at 0.75 nV/rtHz, 65 MSPS
– 98 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
– 12-dB Suppression on 3^rd and 5^th
Harmonics
– Flexible Input Clocks
• Small Package: 15 mm × 9 mm, 135-BGA
APPLICATIONS
• Medical Ultrasound Imaging
• Nondestructive Evaluation Equipments
DESCRIPTION
The AFE5808 is a highly integrated analog front-end
(AFE) solution specifically designed for ultrasound
systems in which high performance and small size
are required. The AFE5808 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 AFE5808 is a suitable ultrasound
analog front end solution not only for high-end
systems, but also for portable ones.
The AFE5808 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, 15, 20, or 30
MHz to support ultrasound applications with different
frequencies. The high-performance 14 bit/65 MSPS
ADC in the AFE5808 achieves 77 dBFS 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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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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