GENERAL DESCRIPTION
The AD9674 is designed for low cost, low power, small size, and ease of use for medical ultrasound. It contains eight channels of a VGA with an LNA, a CW harmonic rejection I/Q demodulator with programmable phase rotation, an AAF, an ADC, a digital HPF, and 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;
         65 mW per channel, CW mode; <30 mW at power-up
      Time gain compensation (TGC) channel input-referred noise:
         0.8 nV/√Hz, maximum gain
      Flexible power-down modes
      Fast recovery from low power standby mode: <2 μs
   Low noise preamplifier (LNA)
      Input-referred noise voltage: 0.78 nV/√Hz, gain = 21.6 dB
      Programmable gain: 15.6 dB/17.9 dB/21.6 dB
      0.1 dB compression: 1.00 V p-p/0.75 V p-p/0.45 V p-p
      Flexible active input impedance matching
   Variable gain amplifier (VGA)
      Attenuator range: 45 dB, linear-in-dB gain control
      Postamp gain: 21 dB/24 dB/27 dB/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)
      Signal-to-noise ratio (SNR): 75 dB, 14 bits up to 125 MSPS
   Configurable serial low voltage differential signaling (LVDS)
   Continuous wave (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 HPF and decimation by 2
   10 mm × 10 mm, 144-ball CSP_BGA