DAS1156

Analog To Digital Converters (ADC) Overview

The Analog Devices DAS1156 is a 15-bit low-level data acquisition system housed in a 2" x 4" x 0.44" metal case. It integrates a gain-programmable instrumentation amplifier, precision sample/hold amplifier, and analog-to-digital converter. The device offers a minimum throughput rate of 20kHz at maximum gain (1000 V/V) and 20kHz at unity gain. Key specifications include differential nonlinearity of ±0.002% FSR max and integral nonlinearity of ±0.003% FSR. It supports resistor-programmable gains from 1 V/V to 1000 V/V with input ranges of ±10mV to ±10V unipolar or ±5mV to ±5V bipolar. The unit features byte-selectable tri-state buffer outputs and internal gain and offset potentiometers for calibration.

Analog To Digital Converters (ADC) Feature Summary

• Functionally complete architecture integrating instrumentation amplifier, sample/hold amplifier, and ADC within a single metal enclosure.
• High common mode rejection exceeding -80dB up to 500Hz, ensuring accurate measurements in noisy environments.
• User-adjustable gain via external resistor and internal trim potentiometers for precise offset and gain calibration.
• Flexible digital interface with byte-selectable tri-state buffers supporting both one-byte and two-byte bus formats.

Analog To Digital Converters (ADC) Applications

• Low level high accuracy data acquisition systems
• Process control instrumentation
• Nuclear instrumentation
• Automated test equipment
• Medical instrumentation

Analog To Digital Converters (ADC) Procurement Notes

Verify component status as the datasheet indicates this model is obsolete. Confirm availability through authorized distributors or surplus channels. Ensure compatibility with existing +15V and +5V power supply rails. Check for required accessories such as specific gain-setting resistors or calibration tools if not included. Validate that the metal package dimensions fit the mechanical constraints of the target application.

Analog To Digital Converters (ADC) Selection Notes

Select the DAS1156 over the DAS1155 when higher resolution is required, as it provides 15-bit performance compared to 14-bit. Consider the guaranteed nonlinearity of ±0.003% FSR for applications demanding strict accuracy. Evaluate the 20kHz throughput rate against system speed requirements. Ensure the design accommodates the specific timing constraints for trigger pulses and sample/hold acquisition times defined in the datasheet.

Analog To Digital Converters (ADC) Part Context

The DAS1156 belongs to the DAS1155/DAS1156 series of 14-bit and 15-bit low-level data acquisition systems manufactured by Analog Devices. These units are designed to reduce design and debug time by providing all necessary circuitry for microprocessor bus interfaces in a compact metal case. They utilize thin-film components and integrated circuits to achieve high stability and accuracy.

Analog To Digital Converters (ADC) Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. As the datasheet marks the device as obsolete, alternative solutions may require redesigning the signal chain using discrete instrumentation amplifiers, sample-and-hold circuits, and high-resolution ADCs to replicate the functionality.

Analog To Digital Converters (ADC) FAQ

What is the maximum differential nonlinearity for the DAS1156?

The maximum differential nonlinearity for the DAS1156 is ±0.002% FSR.

How is the gain of the instrumentation amplifier configured?

The gain is resistor programmable, ranging from 1 V/V to 1000 V/V, determined by an external resistor connected to the gain terminals.

What are the supported digital output coding formats?

The DAS1156 supports true binary format for unipolar operation, and offset binary or two's complement codes for bipolar operation.