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The AD4856BBCZ is an 8-channel data acquisition system (DAS) manufactured by Analog Devices.

I. Instructions

The AD4856BBCZ 8-channel Data acquisition System (DAS) provides differential, wide common model range inputs combined with seamless high dynamic range (SHDR) technology. This fully buffered 8-channel synchronous sampling 20-bit 250kSPS DAS is powered by a 5V low voltage supply with a flexible input buffer power supply, enabling precision low drift internal reference and reference buffer. These features help to independently configure the SoftSpan range for each channel to match the local application signal swing, minimizing additional external signal conditioning.

The AD4856 uses seamless High Dynamic range (SHDR) technology to further maximize single-transition dynamic range. When enabled, the input signal path gain of the channel is automatically optimized on a sample-by-sample basis, minimizing converter noise per sample without affecting linearity.

Ii. Characteristics

Complete 20-bit data acquisition system

Synchronous sampling of 8 internal buffer channels

Throughput rate of 250kSPS per channel

Differential, wide common model range input

Typical input leakage current: ±75pA (25°C)

Full scale input step stability time: <300ns

Integrated reference and Reference buffer (4.096V)

Integrated power decoupling capacitor

27mW per channel at 250kSPS, varying with throughput

Minimize external signal conditioning

Seamless high dynamic range

Automatic gain range per sample, per channel

Maintain ppm integral nonlinearity (INL)

SoftSpan input range per channel: bipolar or unipolar

±40V, ±25V, ±20V, ±12.5V, ±10V, ±6.25V, ±5V, ±2.5V

0V to 40V, 25V, 20V, 12.5V, 10V, 6.25V, 5V, 2.5V

The rail-to-rail input exceeds the drive tolerance

High performance

Typical INL value: ±160μV (±40V range)

Typical NR single conversion value: 97.2dB (±40V range)

Typical DR Single conversion value: 111.4dB (±40V range)

Typical THD value: -117dB (±40V range)

Typical CMRR value: 120dB

Digital flexibility

SPI CMOS (0.9V to 5.25V) and LVDS serial inputs and outputs

Optional oversampling with 24-digit averaging function

Optional offset, gain and phase correction

7.00mm square, 64 welded ball grid Array (BGA) full solution

3. Functional block diagram

4. Application

Automatic test equipment

Avionics and Aerospace

Instrumentation and control systems

Semiconductor manufacturing

Test and measurement