Analog Devices Inc. AD7812YRZ

Overview

AD7812YRZ from Analog Devices is a 10-bit, 8-channel successive approximation ADC with on-chip track-and-hold, 2.5 V ±2.5% reference, and DSP/microcontroller-compatible serial interface. It operates from a single 2.7 V to 5.5 V supply, achieves 350 kSPS throughput, and supports pseudo-differential or single-ended input configurations - used in industrial sensor signal conditioning and embedded data acquisition systems.

For engineers reviewing the AD7812YRZ datasheet, AD7812YRZ pinout, AD7812YRZ application, or AD7812YRZ equivalent, key selection considerations include its 8-channel analog input flexibility, internal reference accuracy (±2.5%), 2.3 µs conversion time, and SOIC-20 package compatibility with multipackage serial bus sharing via A0 address pin.

Technical Context

The AD7812YRZ implements a charge redistribution DAC architecture with an integrated oscillator and comparator-based successive approximation logic. Its serial interface uses separate RFS/TFS framing signals for DSP synchronization and supports simultaneous control register write and data read operations.

Input channel configuration is fully software-controlled via a 10-bit write-only control register, enabling dynamic reconfiguration between eight single-ended inputs or four independent pseudo-differential pairs (VIN1/VIN2, VIN3/VIN4, VIN5/VIN6, VIN7/VIN8), with hardware-selectable device addressing via the A0 pin for multi-device bus sharing.

Key Specifications

Pinout & Package

AD7812YRZ is housed in a 20-lead Small Outline IC (SOIC) package with standard 0.3-inch width and 1.27 mm pitch. Pin 1 is marked by a beveled corner or dot; devices are RoHS-compliant and rated for –40°C to +105°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit SAR ADC applications.

Compared with AD7812YRU, AD7812YRZ provides easier PCB layout and thermal management in standard SOIC sockets; compared with AD7910BRMZ, it delivers lower system BOM cost and greater input topology flexibility at the expense of maximum sample rate.

Availability

AD7812YRZ is available at Aetrix Electronics and suitable for industrial sensor interfaces, embedded data loggers, and automotive body control modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned performance.

Supply support for AD7812YRZ 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, founded in 1965 and headquartered in Wilmington, MA.

The AD7811/AD7812 product line was designed for cost-sensitive, space-constrained embedded systems requiring multi-channel analog input capability with minimal external components and flexible serial interfacing - especially in industrial automation and automotive subsystems.

FAQ

What is the maximum sampling rate supported by the AD7812YRZ?

The AD7812YRZ supports a maximum throughput rate of 350 kSPS, corresponding to a guaranteed maximum conversion time of 2.3 µs. This rate is achievable across all eight input channels when configured in single-ended mode and operated within specified supply (2.7 V–5.5 V) and temperature (–40°C to +105°C) ranges. The AD7812YRZ maintains this performance without external timing components due to its integrated oscillator.

Does the AD7812YRZ require an external reference voltage?

No, the AD7812YRZ does not require an external reference voltage. It includes an on-chip 2.5 V ±2.5% reference that is enabled by default. An external reference (1.2 V to VDD) may be used by setting the EXTREF bit in the control register and connecting the source to the VREF pin - doing so powers down the internal reference circuitry and reduces current consumption by ~1 mA.

How many analog input channels does the AD7812YRZ support, and how are they configured?

The AD7812YRZ supports eight analog input channels (VIN1–VIN8). Configuration is controlled entirely via its 10-bit write-only control register: channels can be set as eight single-ended inputs referenced to AGND, seven pseudo-differential inputs referenced to VIN8, or four independent pseudo-differential pairs (VIN1/VIN2, VIN3/VIN4, VIN5/VIN6, VIN7/VIN8). No hardware changes are needed - all modes are software-selectable.

Can multiple AD7812YRZ devices share the same serial bus?

Yes, two AD7812YRZ devices (or one AD7812YRZ and one AD7811) can share the same 3-wire serial bus using the A0 package address pin and the A0 bit in the control register. When the A0 pin is hardwired high on one device and low on the other, only the device whose A0 pin matches the A0 bit in the transmitted control byte will respond to subsequent serial reads - enabling coordinated 12-channel acquisition without additional interface lines.

What power-saving modes does the AD7812YRZ offer, and how are they activated?

The AD7812YRZ offers two power-saving modes: Partial Power-Down (350 µA) and Full Power-Down (1 µA), both activated automatically at the end of conversion by setting PD1/PD0 bits in the control register. Full Power-Down disables the internal reference and most circuitry; Partial Power-Down retains the reference but powers down the converter core. Both modes reduce average power significantly - e.g., to 315 µW at 10 kSPS - and resume operation within 1.5 µs of CONVST activation.