Analog Devices Inc. AD7823YR-REEL

Overview

AD7823YR-REEL from Analog Devices is an 8-bit successive approximation ADC with 4 µs typical conversion time, inherent track-and-hold functionality, and microcontroller-compatible 3-wire serial interface (CONVST, SCLK, DOUT). It operates from a single 2.7 V to 5.5 V supply, delivers ±1 LSB gain error and ±0.5 LSB relative accuracy over –40°C to +125°C, and targets low-power portable instrumentation requiring precise analog-to-digital conversion.

For engineers reviewing the AD7823YR-REEL datasheet, AD7823YR-REEL pinout, AD7823YR-REEL application, or AD7823YR-REEL equivalent, key selection considerations include its pseudo-differential input architecture, automatic power-down mode enabling 54 µW at 1 kSPS, 8-lead SOIC package compatibility, and guaranteed no missing codes across full 8-bit resolution.

Technical Context

The AD7823YR-REEL implements a charge redistribution DAC-based SAR architecture with internal oscillator and comparator. Its pseudo-differential input (VIN+, VIN–) supports offset cancellation by applying system offset to VIN–, provided VREF ≤ VDD – VOFFSET and VIN– variation stays within ±0.5 LSB during conversion.

It supports two operating modes: Mode 1 (high-speed, no inter-conversion power-down, 4 µs conversion, up to 133 kSPS) and Mode 2 (automatic power-down after each conversion, 6.5 µs effective cycle time, 54 µW at 1 kSPS). Serial data output is edge-aligned to SCLK rising edges, with CONVST rising edge enabling the serial port and falling edge initiating conversion.

Key Specifications

Pinout & Package

AD7823YR-REEL is supplied in an 8-lead small outline IC (SOIC) package per ordering guide (SO-8 option), with standard 1.27 mm lead pitch and 5.0 mm × 6.2 mm body dimensions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7823YR-REEL, AD7810YRZ-REEL7 offers higher resolution and speed in identical packaging but consumes more power at equivalent throughput; MAX1113EUA+ supports tighter supply constraints and standard SPI but requires additional chip-select routing and lacks automatic power-down control via CONVST.

Availability

AD7823YR-REEL is available at Aetrix Electronics and suitable for battery-powered test equipment, industrial process monitoring, and automotive cabin sensors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7823YR-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 is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The AD7823YR-REEL belongs to Analog Devices' legacy high-speed, low-power SAR ADC product line, designed specifically for space-constrained, battery-operated instrumentation where 8-bit accuracy, microsecond conversion, and ultra-low standby power are mandatory.

FAQ

What is the maximum sampling rate achievable with AD7823YR-REEL in high-speed mode?

The AD7823YR-REEL achieves a maximum throughput rate of 133 kSPS in Mode 1 (high-speed mode), constrained by its 4 µs typical conversion time and serial interface timing. At VDD = 5 V, the minimum SCLK period is 50 ns, allowing up to eight bits to be read within ~400 ns-well within the conversion window. Real-world throughput depends on microcontroller serial clock speed and software overhead, but hardware-limited peak is 133 kSPS.

Does AD7823YR-REEL require an external reference voltage?

No, AD7823YR-REEL does not require an external reference. Its VREF pin accepts 1.2 V to VDD, and tying VREF directly to VDD establishes a 0 V to VDD analog input range-eliminating external reference components. This configuration is explicitly supported in the datasheet and maintains full 8-bit performance with ±1 LSB gain error at VDD = 5 V or 3 V.

How does the pseudo-differential input of AD7823YR-REEL improve measurement accuracy?

The AD7823YR-REEL's pseudo-differential input (VIN+, VIN–) improves accuracy by enabling system-level offset cancellation: applying a known offset (e.g., 0.5 V) to VIN– shifts the effective input range, removing fixed sensor or amplifier offsets before digitization. This preserves full 8-bit resolution across the desired signal band, provided VIN– remains stable within ±0.5 LSB during conversion and VREF ≤ VDD – VOFFSET.

Can AD7823YR-REEL operate reliably at 125°C junction temperature?

Yes, AD7823YR-REEL is fully specified and tested over –40°C to +125°C ambient temperature. Its SOIC package has θJA = 160°C/W, and with proper PCB copper area and thermal vias, it sustains continuous operation at 125°C ambient. All key parameters-including relative accuracy (±0.5 LSB), conversion time (4 µs), and power dissipation-are guaranteed across this range per Rev. C datasheet.

What is the power consumption of AD7823YR-REEL at 10 kSPS in automatic power-down mode?

In automatic power-down mode (Mode 2), AD7823YR-REEL consumes 540 µW at 10 kSPS with VDD = 3 V. This value derives from 1.5 µs power-up time + 5 µs conversion time = 6.5 µs active duration per 100 µs cycle, resulting in (6.5/100) × 10.5 mW = 683 µW worst-case; the datasheet specifies 540 µW typical at this rate, reflecting measured efficiency under nominal conditions.