AD7724AST

ADCs/DACs - Special Purpose Overview

The AD7724AST is a dual-channel seventh-order sigma-delta modulator from Analog Devices, housed in a 48-lead LQFP package. It operates on a single 5 V analog/digital supply and a separate 3 V digital I/O supply. The device features two independent modulators with differential inputs supporting ±1.25 V bipolar or 0 V to +2.5 V unipolar ranges. Key electrical specifications include a maximum master clock frequency of 13 MHz, an integral nonlinearity of ±0.003% FSR, and a typical dynamic range of 90 dB.

ADCs/DACs - Special Purpose Feature Summary

• Dual seventh-order sigma-delta modulators with continuous sampling capability
• Integrated 2.5 V bandgap voltage reference with buffer outputs
• Supports both internal and external reference configurations
• Logic outputs compatible with 3 V or 5 V systems via DVDD1

ADCs/DACs - Special Purpose Applications

• High-resolution data acquisition systems requiring digital filtering
• Industrial process control instrumentation
• Precision measurement equipment utilizing external decimation filters

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and temperature range. Confirm that the required logic voltage levels for DVDD1 align with the target system interface standards before procurement.

ADCs/DACs - Special Purpose Selection Notes

Select this component when a high-order modulator architecture is required for noise shaping. Ensure the design includes appropriate external digital FIR filters to reconstruct the signal, as the device outputs a raw bit stream rather than a parallel digital word.

ADCs/DACs - Special Purpose Part Context

This part belongs to the AD7724 series of CMOS modulators. It is distinct from complete ADCs as it provides only the modulation stage. The 'AST' designation indicates the commercial/industrial temperature range variant packaged in the ST-48 plastic thin quad flatpack.

ADCs/DACs - Special Purpose Replacement Considerations

Direct pin-compatible replacements are not explicitly documented in the provided source material. Verify functional equivalence regarding clock requirements and input impedance if substituting with other sigma-delta modulators.