AD9675KBCZ

ANALOG DEVICES  AD9675KBCZ  芯片, 超声, 模拟前端/数字解调器, CSPBGA-144 新

Product Details

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 termination. 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.

Applications

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Medical imaging/ultrasound

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Nondestructive testing NDT

### Features and Benefits

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

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Low power:

\- 150 mW per channel, TGC mode, 40 MSPS

\- 62.5 mW per channel, CW mode

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10 mm × 10 mm, 144-ball CSP_BGA

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TGC channel input referred noise: 0.82 nV/√Hz, maximum gain

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Flexible power-down modes

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Fast recovery from low power standby mode: 2 μs

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Low noise preamplifier LNA

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Input referred noise:

0.78 nV/√Hz, gain = 21.6 dB

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Programmable gain: 15.6 dB, 17.9 dB, or 21.6 dB

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0.1 dB compression: 1000 mV p-p, 750 mV p-p, or 450 mV p-p

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Flexible active input impedance matching

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Variable gain amplifier VGA

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Attenuator range: 45 dB, linear in dB gain control

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Postamp gain PGA: 21 dB, 24 dB, 27 dB, or 30 dB

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Antialiasing filter AAF

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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

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Analog-to-digital converter ADC

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SNR: 75 dB, 14 bits up to 125 MSPS

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JESD204B Subclass 0 coded serial digital outputs

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See data sheet for additional features