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AD9675 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD9675
Beschreibung Octal Ultrasound AFE
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 30 Seiten
AD9675 Datasheet, Funktion
Data Sheet
Octal Ultrasound AFE with JESD204B
AD9675
FEATURES
8 channels of LNA, VGA, AAF, ADC, and digital RF decimator
Low power
150 mW per channel, TGC mode, 40 MSPS
62.5 mW per channel, CW mode
10 mm × 10 mm, 144-ball CSP_BGA
TGC channel input referred noise: 0.82 nV/√Hz,
maximum gain
Flexible power-down modes
Fast recovery from low power standby mode: 2 μs
Low noise preamplifier (LNA)
Input referred noise: 0.78 nV/√Hz, gain = 21.6 dB
Programmable gain: 15.6 dB, 17.9 dB, or 21.6 dB
0.1 dB compression: 1000 mV p-p, 750 mV p-p, or 450 mV p-p
Flexible active input impedance matching
Variable gain amplifier (VGA)
Attenuator range: 45 dB, linear in dB gain control
Postamp gain (PGA): 21 dB, 24 dB, 27 dB, or 30 dB
Antialiasing filter (AAF)
Programmable second-order low-pass filter (LPF) from
8 MHz to 18 MHz or 13.5 MHz to 30 MHz and high-pass
filter (HPF)
Analog-to-digital converter (ADC)
SNR: 75 dB, 14 bits up to 125 MSPS
JESD204B Subclass 0 coded serial digital outputs
CW Doppler mode harmonic rejection I/Q demodulator
Individual programmable phase rotation
Dynamic range per channel: 160 dBFS/√Hz
Close-in SNR: 156 dBc/√Hz, 1 kHz offset, −3 dBFS input
RF digital decimation by 2 and high-pass filter
APPLICATIONS
Medical imaging/ultrasound
Nondestructive testing (NDT)
GENERAL DESCRIPTION
The AD9675 is designed for low cost, low power, small size, and
ease of use for medical ultrasound. It contains eight channels of
a variable gain amplifier (VGA) with a low noise preamplifier
(LNA), a continuous wave (CW) harmonic rejection I/Q
demodulator with programmable phase rotation, an antialiasing
filter (AAF), an analog-to-digital converter (ADC), and a digital
high-pass filter and RF decimation by 2 for data processing and
bandwidth reduction.
Each channel features a maximum gain of up to 52 dB, a fully
differential signal path, and an active input preamplifier termina-
tion. The channel is optimized for high dynamic performance
and low power in applications where a small package size is critical.
The LNA has a single-ended to differential gain that is selectable
through the serial port interface (SPI). Assuming a 15 MHz
noise bandwidth (NBW) and a 21.6 dB LNA gain, the LNA
input SNR is 94 dB. In CW Doppler mode, each LNA output
drives an I/Q demodulator that has independently
programmable phase rotation with 16 phase settings.
Power-down of individual channels is supported to increase
battery life for portable applications. Standby mode allows quick
power-up for power cycling. In CW Doppler operation, the
VGA, AAF, and ADC are powered down. The ADC contains
features to maximize flexibility and minimize system cost, such
as a programmable clock, data alignment, and programmable
digital test pattern generation. The digital test patterns include
built-in fixed patterns, built-in pseudorandom patterns, and
custom user-defined test patterns entered via the SPI.
Rev. A
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2013–2016 Analog Devices, Inc. All rights reserved.
Technical Support
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AD9675 Datasheet, Funktion
Data Sheet
Parameter1
Correlated Noise Ratio
Output Offset
Signal-to-Noise Ratio (SNR)
Close-In SNR
Second Harmonic
Third Harmonic
Two-Tone Intermodulation
Distortion (IMD3)
Channel-to-Channel Crosstalk
GAIN ACCURACY
Gain Law Conformance Error
Channel-to-Channel Matching
PGA Gain
GAIN CONTROL INTERFACE
Control Range
Control Common Mode
Input Impedance
Gain Range
Gain Sensitivity
Response Time
CW DOPPLER MODE
LO Frequency
Phase Resolution
Output DC Bias (Single-Ended)
Output AC Current Range
Transconductance (Differential)
Input Referred Noise Voltage
Noise Figure
Input Referred Dynamic Range
Test Conditions/Comments
No signal, correlated/uncorrelated
fIN = 5 MHz at −12 dBFS, VGAIN = −1.6 V
fIN = 5 MHz at −1 dBFS, VGAIN = 1.6 V
fIN = 3.5 MHz at −0.5 dBFS, VGAIN = 0 V,
1 kHz offset
fIN = 5 MHz at −12 dBFS, VGAIN = −1.6 V
fIN = 5 MHz at −1 dBFS, VGAIN = 1.6 V
fIN = 5 MHz at −12 dBFS, VGAIN = −1.6 V
fIN = 5 MHz at −1 dBFS, VGAIN = 1.6 V
fRF1 = 5.015 MHz, fRF2 = 5.020 MHz, ARF1 =
−1 dBFS, ARF2 = −21 dBFS, VGAIN = 1.6 V, IMD3
relative to ARF2
fIN1 = 5.0 MHz at −1 dBFS
Overrange condition2
TA = 25°C
−1.6 < VGAIN < −1.28 V
−1.28 V < VGAIN < +1.28 V
1.28 V < VGAIN < 1.6 V
VGAIN = 0 V, normalized for ideal AAF loss
−1.28 V < VGAIN < +1.28 V, 1 σ
Differential
GAIN+, GAIN−
GAIN+, GAIN−
Analog
Digital step size
Analog 45 dB change
fLO = fMLO/M
Per channel, 4LO mode
Per channel, 8LO mode, 16LO mode
CWI+, CWI−, CWQ+, CWQ−
Per CWI+, CWI−, CWQ+, CWQ−, each channel
enabled (2 fLO and baseband signal)
Demodulated IOUT/VIN, per CWI+, CWI−,
CWQ+, CWQ−
LNA gain = 15.6 dB
LNA gain = 17.9 dB
LNA gain = 21.6 dB
RS = 0 Ω, RFB = ∞
LNA gain = 15.6 dB
LNA gain = 17.9 dB
LNA gain = 21.6 dB
RS = 50 Ω, RFB = ∞
LNA gain = 15.6 dB
LNA gain = 17.9 dB
LNA gain = 21.6 dB
RS = 0 Ω, RFB = ∞
LNA gain = 15.6 dB
LNA gain = 17.9 dB
LNA gain = 21.6 dB
Rev. A | Page 5 of 60
Min
−125
Typ
−30
69
59
−130
−70
−62
−61
−55
−54
Max
+125
−60
−55
0.4
−1.3 +1.3
−0.5
−0.9 +0.9
0.1
21/24/27/30
−1.6
0.7 0.8
10
45
14
3.5
750
+1.6
0.9
1 10
45
22.5
AVDD2 ÷ 2
±2.2 ±2.5
3.3
4.3
6.6
1.6
1.3
1.0
5.7
4.5
3.4
164
162
160
AD9675
Unit
dB
LSB
dBFS
dBFS
dBc/√Hz
dBc
dBc
dBc
dBc
dBc
dB
dB
dB
dB
dB
dB
dB
dB
V
V
dB
dB/V
dB
ns
MHz
Degrees
Degrees
V
mA
mA/V
mA/V
mA/V
nV/√Hz
nV/√Hz
nV/√Hz
dB
dB
dB
dBFS/√Hz
dBFS/√Hz
dBFS/√Hz

6 Page









AD9675 pdf, datenblatt
Data Sheet
MLO–
MLO+
RESET–
RESET+
tMLO
tSETUP
tHOLD
Figure 5. CW Doppler Mode Input MLO±, Pulse Synchronous RESET± Timing, 4LO/8LO/16LO Mode
MLO–
MLO+
RESET–
RESET+
tMLO
tHOLD
tSETUP
Figure 6. CW Doppler Mode Input MLO±, Pulse Asynchronous RESET± Timing, 4LO/8LO/16LO Mode
AD9675
Rev. A | Page 11 of 60

12 Page





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