AFE58JD18_15 Datasheet, PDF (1/12 Pages) Texas Instruments – AFE58JD18 16-Channel, Ultrasound AFE with 14-Bit, 65-MSPS or 12-Bit, 80-MSPS ADC,Passive CW Mixer, I/Q Demodulator, and LVDS, JESD204B Outputs

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AFE58JD18
SBAS735 – AUGUST 2015
AFE58JD18 16-Channel, Ultrasound AFE with 14-Bit, 65-MSPS or 12-Bit, 80-MSPS ADC,
Passive CW Mixer, I/Q Demodulator, and LVDS, JESD204B Outputs
1 Features
• 16-Channel, Complete Analog Front-End (AFE):
– 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
• Passive Mixer for CWD:
– Low Close-In Phase Noise:
–156 dBc/Hz at 1 kHz Off 2.5-MHz Carrier
1
– Phase Resolution: λ / 16
– Supports 16X, 8X, 4X, and 1X CW Clocks
– CWD High-Pass Filter Rejects Undesired Low-
Frequency Signals < 1 kHz
• Digital Features:
– Digital I/Q Demodulator after ADC:
– Fractional Decimation Filter M = 1 to 63
with 0.25X Increment Step
– Data Throughput Reduction After
Decimation
– On-Chip RAM with 32 Preset Profiles
• 5-Gbps JESD Interface:
– JESD204B Subclass 0, 1, and 2
– 2, 4, or 8 Channels per JESD Lane
• Small Package: 15-mm × 15-mm NFBGA-289
2 Applications
• Medical Ultrasound Imaging
• Nondestructive Evaluation Equipment
• Sonar Imaging Equipment
3 Description
The AFE58JD18 is a highly-integrated, analog front-
end (AFE) solutions specifically designed for
ultrasound systems where high performance and
small size are required.
Device Information⁽¹⁾
PART NUMBER
OUTPUT
INTERFACE
DIGITAL I/Q
DEMODULATOR
AFE58JD18
LVDS and JESD Supported
(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 IN
16X CLK
1X CLK
VCAT
LNA
0 dB to -40 dB
16 Phases
Generator
CW Mixer
16 x 8
Crosspoint SW
1X CLK
PGA
24, 30 dB
3rd-Order LPF
with 10, 15, 20,
30, 35, and
50 MHz
12-, 14-Bit
ADC
Summing
Amplifier
Reference
Reference
CW I/Q
VOUT
Differential
TGC VCNTL
Digital
Processing
(Optional)
JESD
JESD
Outputs
LVDS
LVDS
Outputs
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.