AD7761 8-Channel, 16-Bit Analog-to-Digital Convert

By Analog Devices Inc 61

AD7761 8-Channel, 16-Bit Analog-to-Digital Convert

ADI's AD7761 is an 8-channel, simultaneous sampling Σ-Δ ADC with a Σ-Δ modulator and digital filter per channel, enabling synchronized sampling of ac and dc signals. The device achieves 97.7 dB dynamic range at a maximum input bandwidth of 110.8 kHz, combined with typical performance of ±1 LSB integral nonlinearity (INL), ±1 LSB offset error, and ±5 LSB gain error. The AD7761 user can trade off input bandwidth, output data rate, and power dissipation. Select one of three power modes to optimize for noise targets and power consumption. The flexibility of the device allows it to become a reusable platform for low power dc and high performance ac measurement modules.

The AD7761 operates with a 5 V AVDD1A and AVDD1B supply, a 2.25 V to 5.0 V AVDD2A and AVDD2B supply, and a 2.5 V to 3.3 V or 1.8 V IOVDD supply (see the 1.8 V IOVDD Operation section for specific requirements for operating at 1.8 V IOVDD). The device requires an external reference; the absolute input reference voltage range is 1 V to AVDD1 − AVSS. The AD7761 comes in a small 10 mm x 10 mm 64-lead LQFP.

Features
  • Number of bits: 16
  • Sampling rate: 256K
  • Number of inputs: 8
  • Input Type: differential
  • Data interface: serial peripheral interface (SPI)
  • Architecture: Sigma-Delta
  • Voltage supply: analog 2 V to 5.5 V
  • Simultaneous sampling
  • Operating temperature: -40°C to +105°C
  • 64-LQFP (10 x 10)
Applications
  • Data acquisition systems: USB/PXI/Ethernet
  • Instrumentation and industrial control loops
  • Audio test and measurement
  • Vibration and asset condition monitoring
  • 3-phase power quality analysis
  • Sonar
  • High precision medical electroencephalogram (EEG) / electromyography (EMG) / electrocardiogram (ECG)

Categories

Top