AD7829BNZ

Overview

The AD7829BNZ is an 8-bit, 8-channel analog-to-digital converter with a maximum throughput of 2 MSPS. It utilizes a half-flash architecture and operates on a single supply voltage ranging from 2.7 V to 3.3 V or 4.5 V to 5.5 V. The device features an internal 2.5 V reference, a track-and-hold amplifier with a full power bandwidth up to 10 MHz, and a parallel interface. Key performance metrics include a conversion time of 420 ns, integral nonlinearity (INL) of ±0.75 LSB, differential nonlinearity (DNL) of ±0.75 LSB, and gain error of ±2 LSB. Power consumption is typically 24 mW in normal operation.

Feature Summary

• Half-flash ADC architecture providing fast 420 ns conversion times for real-time DSP processing.
• On-chip track-and-hold amplifier capable of handling full-scale input signals up to 10 MHz.
• Integrated 2.5 V reference voltage with external offset adjustment via the VMID pin.
• Automatic power-down mode at the end of conversion to minimize power consumption.

Applications

• Data acquisition systems
• DSP front ends
• Disk drives
• Mobile communication systems
• Subsampling applications

Procurement Notes

Verify the specific package type and temperature grade when ordering. Confirm that the required channel count matches the eight-channel configuration of this model. Ensure supply voltage requirements align with the specified operating ranges. Check for any specific revision history updates that may affect pin compatibility or electrical characteristics.

Selection Notes

Select this component for applications requiring high-speed sampling with multiple single-ended inputs. Consider the half-flash architecture for speed versus resolution trade-offs. Evaluate the need for the internal reference against external precision requirements. Assess system power constraints regarding the automatic power-down feature.

Part Context

This part belongs to the AD7822/AD7825/AD7829 family of high-speed, microprocessor-compatible ADCs. While sharing core specifications like resolution and throughput, it differs from siblings by offering eight analog input channels compared to one or four in other variants. All models utilize the same half-flash conversion technique and parallel interface structure.

Replacement Considerations

Direct substitutes within the same family include the AD7822 and AD7825, though they offer fewer input channels. Verify pinout compatibility and channel count requirements before substitution. Other Analog Devices ADCs may require significant circuit redesign due to differing architectures or interfaces.