AFE5818_15 Datasheet, PDF (1/156 Pages) Texas Instruments – AFE5818 16-Channel, Ultrasound, Analog Front-End with 140-mW/Channel Power, 0.75-nV/√Hz Noise, 14-Bit, 65-MSPS or 12-Bit, 80-MSPS ADC, and Passive CW Mixer

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
AFE5818
SBAS687B – FEBRUARY 2015 – REVISED AUGUST 2015
AFE5818 16-Channel, Ultrasound, Analog Front-End with 140-mW/Channel Power,
0.75-nV/√Hz Noise, 14-Bit, 65-MSPS or 12-Bit, 80-MSPS ADC, and Passive CW Mixer
1 Features
• 16-Channel, Complete Analog Front-End:
– LNA, VCAT, PGA, LPF, ADC, and CW Mixer
• LNA with Programmable Gain:
– Gain: 24 dB, 18 dB, and 12 dB
– Linear Input Range:
0.25 V_PP, 0.5 V_PP, and 1 V_PP
– Input-Referred Noise:
0.63 nV/√Hz, 0.7 nV/√Hz, and 0.9 nV/√Hz
– Programmable Active Termination
• Voltage-Controlled Attenuator (VCAT): 40 dB
• Programmable Gain Amplifier (PGA):
24 dB and 30 dB
• Total Signal Chain Gain: 54 dB (max)
• 3rd-Order, Linear-Phase LPF:
– 10 MHz, 15 MHz, 20 MHz, 30 MHz, 35 MHz,
and 50 MHz
• Analog-to-Digital Converter (ADC):
– 14-Bit ADC: 75-dBFS SNR at 65 MSPS
– 12-Bit ADC: 72-dBFS SNR at 80 MSPS
• LVDS Interface Maximum Speed of 1 Gbps
• Noise and Power Optimizations (Full-Channel):
– 140 mW/Ch at 0.75 nV/√Hz, 65 MSPS
– 91.5 mW/Ch at 1.1 nV/√Hz, 40 MSPS
– 80 mW/Ch at CW Mode
• Excellent Device-to-Device Gain Matching:
– ±0.5 dB (typical) and ±1.1 dB (max)
• Low Harmonic Distortion
• Fast and Consistent Overload Recovery
1
• Passive Mixer for CWD:
– Low Close-In Phase Noise:
–156 dBc/Hz at 1 kHz Off 2.5-MHz Carrier
– Phase Resolution: λ / 16
– Supports 16X, 8X, 4X, and 1X CW Clocks
– 12-dB Suppression on 3rd and 5th Harmonics
– CWD High-Pass Filter Rejects Undesired Low-
Frequency Signals < 1 kHz
• Small Package: 15-mm × 15-mm NFBGA-289
2 Applications
• Medical Ultrasound Imaging
• Nondestructive Evaluation Equipment
• Sonar Imaging Equipment
• Multichannel, High-Speed Data Acquisition
3 Description
The AFE5818 is a highly-integrated, analog front-end
(AFE) solution specifically designed for ultrasound
systems where high performance and small size are
required. The device integrates a complete time-gain-
control (TGC) imaging path and a continuous wave
Doppler (CWD) path. The device also allows various
power and noise combinations to be selected to
optimize system performance. Therefore, the
AFE5818 is a suitable ultrasound AFE solution for
high-end and portable systems
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
AFE5818
NFBGA (289) 15.00 mm × 15.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Block Diagram
SPI IN
SPI Logic
Device (1 of 16 Channels)
SPI OUT
LNA
LNA IN
VCAT
0 dB to -40 dB
PGA
24, 30 dB
3rd-Order LPF
with 10, 15, 20,
30, 35, and
50 MHz
12-, 14-Bit _LVDS
ADC
16X CLK
1X CLK
16 Phases
Generator
CW Mixer
16 x 8
Crosspoint SW
1X CLK
Summing
Amplifier
CW I/Q
VOUT
Reference
Reference
Differential
TGC VCNTL
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.