Analog Devices Inc. AD7823YNZ

Overview

AD7823YNZ from Analog Devices is an 8-bit successive approximation ADC with inherent track-and-hold, 4 µs typical conversion time, ±0.5 LSB relative accuracy, and operation from 2.7 V to 5.5 V supply-designed for low-power, battery-powered test equipment requiring pseudo-differential analog input and microcontroller-compatible serial interface.

For engineers reviewing the AD7823YNZ datasheet, AD7823YNZ pinout, AD7823YNZ application, or AD7823YNZ equivalent, key selection considerations include its automatic power-down mode (54 µW at 1 kSPS), 0 V to VREF analog input range, –40°C to +125°C temperature rating, and compatibility with SPI/QSPI/PIC16C microcontrollers via 3-wire serial interface.

Technical Context

The AD7823YNZ implements a charge redistribution DAC architecture with pseudo-differential input (VIN+, VIN–), where VIN– serves as offset reference and must remain stable within ±0.5 LSB during conversion. Its internal oscillator drives a 4 µs SAR conversion cycle, and CONVST edge timing determines operating mode: high-speed continuous sampling (Mode 1) or automatic power-down (Mode 2).

Serial data output on DOUT is synchronized to SCLK rising edges, with CONVST rising edge resetting the bit counter and enabling the serial port-supporting multipackage bus sharing. The device powers up in low-current state and requires a 1.5 µs power-up delay after CONVST rising edge before conversion initiation.

Key Specifications

Pinout & Package

AD7823YNZ is packaged in an 8-lead plastic DIP (0.3" wide, N-8 option), with through-hole mounting and industry-standard pin spacing. Pin functions are electrically identical across SOIC and microSOIC variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7823YNZ, AD7810YRMZ offers higher resolution but consumes ~4× more power at 50 kSPS and requires firmware adaptation, while MAX1113EPA+ eliminates power-down flexibility and changes pin-level control architecture-making AD7823YNZ optimal for battery-constrained, thermally demanding, and microcontroller-integrated designs.

Availability

AD7823YNZ is available at Aetrix Electronics and suitable for battery-powered test equipment, industrial sensor interfaces, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7823YNZ 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design and manufacturing facilities worldwide.

The AD7823YNZ belongs to Analog Devices' precision data acquisition product line, engineered specifically for low-power, high-reliability embedded systems where small footprint, wide temperature operation, and microcontroller interoperability are critical.

FAQ

What is the absolute maximum input voltage on VIN+ and VIN– for the AD7823YNZ?

The absolute maximum analog input voltage on VIN+ and VIN– is –0.3 V to VDD + 0.3 V. Exceeding this range risks forward-biasing internal ESD diodes, potentially causing substrate current injection or irreversible damage. For safe operation, keep inputs within 0 V to VREF and ensure VIN– remains stable to within ±0.5 LSB during conversion. The AD7823YNZ datasheet specifies these limits in the Absolute Maximum Ratings table on page 4.

Does the AD7823YNZ require an external reference, or can it operate with VDD as reference?

The AD7823YNZ supports both configurations: VREF may be connected directly to VDD (enabling 0 V to VDD input range) or driven by an external precision reference (1.2 V to VDD). This flexibility eliminates the need for external reference components in many applications. When VREF = VDD, the AD7823YNZ maintains full 8-bit performance and ±0.5 LSB relative accuracy across its specified temperature range.

How does the automatic power-down mode work in the AD7823YNZ, and what is its impact on conversion timing?

In automatic power-down mode (Mode 2), the AD7823YNZ powers down immediately after conversion completion when CONVST remains low. A rising edge on CONVST triggers 1.5 µs power-up, followed by falling-edge-initiated conversion (5 µs max), resulting in an effective 6.5 µs conversion cycle. This reduces average power to 54 µW at 1 kSPS. The AD7823YNZ timing diagrams (Figures 13 and 15) confirm this behavior is fully characterized and guaranteed across –40°C to +125°C.

Is the AD7823YNZ pin-compatible with other members of the AD78xx family, such as the AD7810?

Yes-the AD7823YNZ shares identical pinout and package (8-lead DIP/SOIC/microSOIC) with the AD7810YRMZ and AD7811YRMZ. However, functional differences exist: AD7810 is 10-bit with 5 µs conversion and higher power, while AD7823YNZ is 8-bit with 4 µs conversion and automatic power-down. Firmware and layout are reusable, but resolution and timing assumptions must be updated for replacement.

What microcontrollers are explicitly supported by the AD7823YNZ serial interface?

The AD7823YNZ serial interface is documented for direct connection to PIC16C6x/7x (SPI Master mode), QSPI, and standard SPI controllers. For 8051 interfacing, SCLK inversion is required per the "Microprocessor Interfacing" section. The AD7823YNZ does not require external level shifters or timing adapters-its 2.0 V VIH and 0.4 V VIL thresholds ensure compatibility with 3.3 V and 5 V logic families without additional circuitry.