Analog Devices Inc. AD7822BR-REEL

Overview

AD7822BR-REEL from Analog Devices is a single-channel, 8-bit, 2 MSPS analog-to-digital converter (ADC) featuring a 420 ns conversion time, on-chip 2.5 V reference, and track-and-hold amplifier. It operates from 3 V ±10% or 5 V ±10% supplies and delivers 48 dB SNR at 30 kHz input frequency - optimized for high-speed data acquisition in DSP front ends and mobile communication subsampling systems.

For engineers reviewing the AD7822BR-REEL datasheet, AD7822BR-REEL pinout, AD7822BR-REEL application, or AD7822BR-REEL equivalent, key selection considerations include its single-ended 1-channel architecture, automatic power-down via CONVST, flexible parallel interface with EOC pulse, and VMID-adjustable input span centered at 1.0 V (3 V supply) or 1.25 V (5 V supply).

Technical Context

The AD7822BR-REEL implements a half-flash ADC architecture: a 4-bit flash stage provides MSBs, followed by a second flash stage for LSBs, completing conversion in ≤420 ns. Its track-and-hold acquires input in ≤200 ns and supports full-scale signals up to 10 MHz, enabling subsampling applications without external anti-aliasing filters.

It integrates a 2.5 V ±2% on-chip reference, supports standalone operation via EOC-triggered interrupt or RD/CS-controlled data read, and combines convert start and power-down control on the CONVST pin - sampling logic level post-conversion to enter low-power mode when low.

Key Specifications

Pinout & Package

AD7822BR-REEL is housed in a 20-lead, 0.3" wide plastic dual in-line package (PDIP), also available in SOIC and TSSOP variants per ordering guide. Pin functions are validated per Analog Devices Rev. C datasheet Figure 3 and Table 4.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit, high-speed ADC applications.

Compared with AD7825BRZ and MAX1186EEE+, the AD7822BR-REEL delivers lowest system-level design effort for single-input, microprocessor-connected applications - eliminating multiplexer control, external reference sourcing, and serial protocol implementation while maintaining identical speed and accuracy.

Availability

AD7822BR-REEL is available at Aetrix Electronics and suitable for disk drive servo systems, mobile baseband receivers, DSP motor control units, portable data loggers, and industrial sensor interfaces requiring stable component supply across extended production lifecycles.

Supply support for AD7822BR-REEL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, serving industrial, automotive, communications, and healthcare markets.

The AD7822BR-REEL belongs to the AD7822/AD7825/AD7829 family - designed specifically for cost-sensitive, high-throughput data acquisition where low latency, integrated reference, and flexible power management outweigh multi-channel density.

FAQ

What is the maximum input frequency the AD7822BR-REEL can accurately digitize?

The AD7822BR-REEL supports full-power bandwidth up to 10 MHz, meaning it maintains specified SNR and distortion performance for sine-wave inputs up to that frequency. This capability is verified per datasheet Table 1 and enables subsampling applications - for example, digitizing 100 MHz IF signals using 2 MSPS sampling. The AD7822BR-REEL's track-and-hold acquisition time of ≤200 ns ensures fidelity even at these high input frequencies.

Does the AD7822BR-REEL require an external reference voltage?

No, the AD7822BR-REEL includes a factory-trimmed 2.5 V ±2% on-chip reference accessible at the VREF IN/OUT pin. It operates fully self-contained with this reference enabled. However, the pin can also accept an external precision reference (e.g., AD780) for improved accuracy - in which case the internal reference is disabled. The AD7822BR-REEL's specification tables assume use of the internal 2.5 V reference unless otherwise noted.

How does automatic power-down work on the AD7822BR-REEL?

The AD7822BR-REEL monitors the CONVST pin logic level at the instant the EOC signal rises, marking end-of-conversion. If CONVST is low at that moment, the device enters power-down mode, reducing supply current to ≤5 µA. This feature eliminates need for separate power-control circuitry. To re-enable, a rising edge on CONVST wakes the AD7822BR-REEL - confirmed in Rev. C datasheet Operating Modes section.

Can the AD7822BR-REEL interface directly with a 3.3 V microcontroller?

Yes - the AD7822BR-REEL supports 3 V ±10% operation (2.7 V to 3.3 V), and its logic inputs accept VIH ≥2.0 V and VIL ≤0.4 V under that supply, matching standard 3.3 V CMOS levels. Its outputs drive VOH ≥2.4 V and VOL ≤0.2 V at 200 µA load, ensuring reliable interfacing with 3.3 V microcontrollers like ARM Cortex-M4 or Renesas RX65N without level shifters. All timing parameters in Table 2 are validated for 3 V operation.

What is the purpose of the VMID pin on the AD7822BR-REEL?

The VMID pin sets the center voltage of the AD7822BR-REEL's analog input range. With no connection, it defaults to 1.0 V (3 V supply) or 1.25 V (5 V supply), establishing a 0 V–2.0 V or 0 V–2.5 V input span. Connecting an external voltage (e.g., 1.65 V) shifts the span accordingly - enabling single-supply op amps to drive the full 8-bit range without negative rails. This flexibility is documented in the Analog Input section of the AD7822BR-REEL datasheet Rev. C.