AD7827BR-REEL7

Overview

The AD7827BR-REEL7 is an 8-bit, single-channel analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates from a single 3 V or 5 V supply and achieves a maximum throughput of 1 MSPS with a conversion time of 420 ns. The device integrates a track-and-hold amplifier, a half-flash ADC core, and a serial interface compatible with DSPs. It features an on-chip 2.5 V reference with 2% tolerance. DC accuracy specifications include ±0.5 LSB integral nonlinearity (INL), ±0.5 LSB differential nonlinearity (DNL), ±1.5 LSB offset error, and ±2 LSB gain error. Dynamic performance at 30 kHz input frequency yields a signal-to-noise-plus-distortion ratio of 48 dB minimum. Power consumption is typically 24 mW in normal operation and drops to 1 μA in power-down mode.

Feature Summary

• Integrates a high-speed half-flash ADC architecture with an on-chip track-and-hold amplifier for precise sampling control.
• Features a three-wire serial interface optimized for direct connection to popular digital signal processors without external logic.
• Includes an automatic power-down mechanism triggered by the CONVST pin state to minimize average power consumption.
• Contains an internal 2.5 V voltage reference with specified tolerance, eliminating the need for external reference components.

Applications

• Direct interfacing with TMS320C5x and ADSP-21xx family digital signal processors.
• High-speed data acquisition systems requiring single-ended analog input digitization.
• Battery-powered instrumentation utilizing automatic power-down modes for energy efficiency.

Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm package type and tape/reel configuration. Ensure that the BR suffix corresponds to the Small Outline IC (SOIC) package variant required for the design. Confirm RoHS compliance status and lead-free soldering compatibility prior to procurement. Cross-reference the revision level of the datasheet to ensure all electrical specifications match the intended application requirements.

Selection Notes

Select this component when an 8-bit resolution and 1 MSPS sampling rate are sufficient for the application. It is suitable for designs operating exclusively on 3 V or 5 V single supplies. Consider the half-flash architecture if low latency is critical. Evaluate the serial interface requirements to ensure compatibility with the host microcontroller or DSP clocking scheme. Verify that the single-ended input range aligns with the system's analog signal levels.

Part Context

The AD7827 belongs to Analog Devices' series of low-power, high-speed serial interface ADCs. It is designed to bridge analog signals to digital processing units efficiently. The BR variant specifically denotes the SOIC-8 package option within the AD7827 product line. This part serves as a cost-effective solution for applications where moderate resolution and high speed are balanced with low power constraints.

Replacement Considerations

Consult official Analog Devices documentation for qualified replacement parts. Verify pinout compatibility and electrical parameter equivalence before substitution.