Datasheet > AD9675

AD9675

更新时间： 2024-11-04 12:51:55

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
2页	80K
描述
Octal Ultrasound AFE with JESD204B

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AD9675 数据手册

Octal Ultrasound AFE

with JESD204B

AD9675

Preliminary Technical Data

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 CW harmonic rejection I/Q demodulator

with programmable phase rotation, an anti-aliasing filter

(AAF), an analog-to-digital converter (ADC), a digital high-

pass filter and an RF decimation by 2.

FEATURES

8 channels of LNA, VGA, AAF, ADC, and digital RF decimator

Low power: 150 mW per channel, TGC mode, 40 MSPS;

65mW per channel, CW mode; <30mW at power-up

10 mm × 10 mm, 144-ball CSP-BGA

TGC channel input-referred noise: 0.8 nV/√Hz, max gain

Flexible power-down modes

Fast recovery from low power standby mode: <2 μs

Overload recovery: <10 ns

Each channel features a maximum gain of up to 52 dB, a fully

differential signal path, and an active input preamplifier

termination. The channel is optimized for high dynamic

performance and low power in applications where a small

package size is critical.

Low noise preamplifier (LNA)

Input-referred noise: 0.78 nV/√Hz, gain = 21.6 dB

Programmable gain: 15.6 dB/17.9 dB/21.6 dB

0.1 dB compression: 1000 mV p-p/750 mV p-p/450 mV p-p

Flexible active input impedance matching

Variable gain amplifier (VGA)

The LNA has a single-ended-to-differential gain that is selectable

through the 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.

Attenuator range: 45dB, Linear-in-dB gain control

Postamp gain (PGA): 21 dB/24 dB/27 dB/30 dB

Antialiasing filter (AAF)

Programmable second-order LPF from 8 MHz to 18 MHz or

13.5MHz to 30MHz and HPF

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

several features designed 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 pseudo random

patterns, and custom user-defined test patterns entered via the

serial port interface.

Analog-to-digital converter (ADC)

SNR: 75dB, 14 bits up to 125 MSPS

JESD204B Subclass 0 coded serial digital outputs

CW mode harmonic rejection I/Q demodulator

Individual programmable phase rotation

Output dynamic range per channel: >160 dBc/√Hz

Output-referred SNR: 156 dBc/√Hz, 1 kHz offset, −3dBFS

RF digital high-pass filter and decimation by 2

GENERAL DESCRIPTION

Figure 1.

Rev. PrB

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother

rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

www.analog.com

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