Date
05/18/2016
PDF
AD7768 8-Channel, 24-Bit, Simultaneous Sampling ADC
Mouser Electronics, is now stocking the AD7768 24-bit analog-to-digital converter (ADC) from Analog Devices. The 8-channel, simultaneous sampling ADC features a sigma-delta modulator and digital filter per channel, enabling the device to perform synchronized sampling of both AC and DC signals and allowing it to become a reusable platform for low-power DC and high-performance AC measurement modules.
The AD7768 is equipped with three power modes and up to 256 kSPS ADC output data rate per ADC channel, achieving -120 dB total harmonic distortion (THD), 108 dB of dynamic range at a maximum input bandwidth of 110.8 kHz, and has a combined typical performance of ±2 ppm integral nonlinearity (INL), ±50 μV offset error, and ±30 ppm gain error.
The device allows designer engineers to trade off input bandwidth, output data rate, and power dissipation. Using one of the three power modes — fast mode (256 kSPS maximum), median mode (128 kSPS maximum) and eco mode (32 kSPS maximum) — designers can optimize their designs for noise targets and power consumption. In addition, the AD7768 offers extensive digital filtering capabilities, such as a wideband, low ±0.005 dB pass-band ripple, antialiasing low-pass filter with sharp roll-off, and 105 dB stop band attenuation at the Nyquist frequency.
For low-bandwidth and low-noise measurements, the device also offers a sinc response through a sinc5 filter. Both the wideband and sinc5 filters can be selected and run on a per-channel basis, and between the filter options, designers can improve the dynamic range by selecting from decimation rates of ×32, ×64, ×128, ×256, ×512, and ×1024, providing optimal noise performance to the required input bandwidth.
The 12 × 12mm AD7768 ADC operates over the -40 to +105 degrees Celsius industrial temperature range, and is targeted toward a variety of low-power applications, including data acquisition systems, instrumentation and industrial control loops, vibration and asset condition monitoring, 3-phase power quality analysis, and high-precision medical equipment. Additionally, the AD7768 is supported by an evaluation board, which is also available to order through the Mouser Electronics website.
