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Description:

The AD9674 supports medical ultrasound applications and is designed for low cost, low power consumption, small size and ease of use. It includes an 8-channel variable gain amplifier (VGA), a low noise preamplifier (LNA), a CW harmonic suppression I/Q demodulator with programmable phase rotation, an anti-aliasing filter (AAF), an analog to digital converter (ADC), a digital high-pass filter, and a 2x RF extractor.

Each channel has a maximum gain of 52 dB, a fully differential signal path, and an active input preamplifier terminal. Optimized for high dynamic range and low power consumption, the channel is suitable for applications requiring small packages.

The LNA has a single-ended differential gain and can be selected by SPI. Assuming a noise bandwidth (NBW) of 15 MHz and an LNA gain of 21.6 dB, the LNA input signal-to-noise ratio (SNR) is 94 dB. In CW Doppler mode, each LNA output drives an I/Q demodulator. Each demodulator has independently programmable phase rotation and 16 phase Settings.

Each channel can be individually entered into power-saving mode to extend battery life for portable applications. Use the standby mode to quickly power on, so as to restart. When operating in CW Doppler mode, VGA, AAF, and ADC all enter power-saving mode. A variety of features, such as programmable clocks, data alignment, and the generation of programmable digital test codes, are built into the ADC to maximize device flexibility and minimize system costs. Digital test codes include built-in fixed codes and pseudo-random codes, as well as user-defined test codes entered via serial port (SPI).

Applications

• Medical imaging/ultrasound

• Non-destructive Testing (NDT)

Features

8-channel LNA, VGA, AAF, ADC and digital RF extraction filter

Low power consumption: TGC mode: 150 mW(40 MSPS) per channel; CW mode: 62.5mW per channel; Power saving mode: <30 mW

Time Gain Compensation (TGC) channel reduced to input noise: 0.82 nV/√Hz (maximum gain)

Flexible power saving mode

Fast recovery from low-power standby mode: < 2μs

Low Noise Preamplifier (LNA)

Converted to input noise voltage: 0.78nV /√Hz, gain = 21.6dB

Programmable gain: 15.6 dB/17.9 dB/21.6 dB

0.1 dB compression: 1.00V p-p/ 0.75V p-p/ 0.45V p-p

Flexible active input impedance matching

Variable Gain Amplifier (VGA)

Attenuator range: 45 dB, linear dB gain control

Post amplifier gain (PGA) : 21 dB/24 dB/27 dB/30 dB

If you want to buy AD9674KBCZ, or need BOM table, please feel free to contact us!

Contact: Mr. Chen

Tel: +8613410018555

Email: sales@hkmjd.com