Analog Devices Inc. AD7823YRMZ

Overview

AD7823YRMZ from Analog Devices is an 8-bit successive approximation ADC with inherent track-and-hold, 4 µs typical conversion time, 2.7 V to 5.5 V single-supply operation, and microcontroller-compatible 3-wire serial interface. It delivers ±0.5 LSB relative accuracy and operates across –40°C to +125°C for battery-powered portable instrumentation.

For engineers reviewing the AD7823YRMZ datasheet, AD7823YRMZ pinout, AD7823YRMZ application, or AD7823YRMZ equivalent, key selection criteria include pseudo-differential analog input support, automatic power-down mode enabling 570 µW at 10 kSPS, VREF range of 1.2 V to VDD, 8-lead microSOIC package, and guaranteed no missing codes over full 8-bit resolution.

Technical Context

The AD7823YRMZ employs a charge redistribution DAC architecture with internal oscillator and comparator-based successive approximation logic. Its pseudo-differential input (VIN+, VIN–) supports offset cancellation in unipolar systems, and acquisition time is specified at ≤100 ns after conversion end.

Two operating modes are supported: Mode 1 enables continuous high-speed sampling (up to 133 kSPS) without inter-conversion power-down; Mode 2 uses CONVST edge timing to trigger automatic power-up before conversion and power-down after result latching-reducing average power by >99% at low throughput rates.

Key Specifications

Pinout & Package

AD7823YRMZ is housed in an 8-lead microSOIC package (RM-8), 3 mm × 3 mm body, 0.65 mm lead pitch, JEDEC MS-012AC compliant. Pin 1 marked with dot; pins numbered counterclockwise from top-left corner in top view.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7823YRMZ, AD7810YRMZ offers two additional bits at identical speed and package-ideal for resolution upgrades-while ADS7822U trades integrated power management and reference flexibility for vendor-specific ecosystem alignment and slightly relaxed DC specs.

Availability

AD7823YRMZ is available at Aetrix Electronics and suitable for battery-powered test equipment, automotive cabin monitoring, and industrial motor current sensing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7823YRMZ 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 Wilmington, MA.

The AD7823YRMZ belongs to Analog Devices' legacy high-speed, low-power SAR ADC product line designed specifically for space-constrained, battery-operated instrumentation where integration, temperature robustness, and deterministic power behavior are critical.

FAQ

What is the maximum sampling rate achievable with AD7823YRMZ?

The AD7823YRMZ achieves up to 133 kSPS in Mode 1 (continuous high-speed operation), limited by serial interface speed and microcontroller capability-not by internal conversion time. At 4 µs conversion time, theoretical maximum is 250 kSPS, but timing margins for CONVST setup/hold and serial read completion reduce practical throughput. For sustained operation, 100 kSPS is recommended with standard 8-bit microcontrollers.

Does AD7823YRMZ require an external reference voltage?

No, AD7823YRMZ does not require an external reference. VREF may be tied directly to VDD, enabling self-referenced 0 V to VDD analog input range. This eliminates external components and reduces BOM cost. When higher accuracy is needed, an external precision reference (1.2 V to VDD) can be applied to VREF for improved stability and reduced supply sensitivity.

How does the automatic power-down mode function in AD7823YRMZ?

In AD7823YRMZ automatic power-down mode (Mode 2), the device powers down immediately after conversion completion when CONVST remains low. A rising edge on CONVST triggers power-up (1.5 µs), followed by falling edge to start conversion. This eliminates idle current between samples-reducing average power to 570 µW at 10 kSPS and 5 µW in standby-without firmware overhead.

Can AD7823YRMZ interface directly with SPI-compatible microcontrollers?

Yes, AD7823YRMZ interfaces directly with SPI-compatible microcontrollers using its 3-wire serial protocol (CONVST as chip select, SCLK as clock, DOUT as data out). No level shifters or glue logic are needed. The rising edge of CONVST resets the internal bit counter, and data is clocked out on SCLK rising edges. Compatibility confirmed with PIC16C, QSPI, and standard SPI masters; 8051 requires SCLK inversion per datasheet guidance.

What is the meaning of "pseudo-differential" input in AD7823YRMZ?

"Pseudo-differential" in AD7823YRMZ means VIN+ and VIN– form a differential pair where VIN– serves as a programmable common-mode reference-not a true fully differential input. During conversion, the sampling capacitor connects to VIN–, allowing system-level offset cancellation (e.g., applying 0.5 V to VIN– shifts full-scale range). VIN– must remain stable within ±0.5 LSB during conversion; for single-ended use, tie VIN– to AGND.