Analog Devices Inc. AD7812YRUZ

Overview

AD7812YRUZ from Analog Devices is a 10-bit, 8-channel sampling ADC with successive approximation architecture, onboard track-and-hold and 2.5 V ±2.5% internal reference, operating from a single 2.7 V to 5.5 V supply at up to 350 kSPS. It supports pseudo-differential or single-ended input configurations and targets embedded data acquisition in industrial sensor interfaces and motor control feedback loops.

For engineers reviewing the AD7812YRUZ datasheet, AD7812YRUZ pinout, AD7812YRUZ application, or AD7812YRUZ equivalent, key selection considerations include its 8-channel analog input flexibility, 2.3 µs conversion time, software/hardware convert start capability, and shared serial bus support via A0 address pin for multi-device systems.

Technical Context

The AD7812YRUZ implements a charge redistribution DAC-based successive approximation converter with integrated track-and-hold amplifier and programmable input multiplexer. Its serial interface uses three-wire DSP/microcontroller-compatible framing (RFS/TFS) and clock (SCLK), supporting simultaneous read/write operations.

Input channel configuration is controlled via a 10-bit write-only register that defines single-ended vs. pseudo-differential mode, channel selection (CH2–CH0), power-down state (PD1/PD0), and external reference enable (EXTREF). The device enters full power-down (1 µA) or partial power-down (350 µA) based on register settings and CONVST edge timing.

Key Specifications

Pinout & Package

AD7812YRUZ is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP), 4.4 mm × 6.5 mm body, 0.65 mm pitch, RoHS-compliant, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7812YRZ, AD7812YRUZ offers smaller PCB footprint and improved manufacturability in fine-pitch assembly, while ADS7822U trades channel count and configurability for higher resolution-neither is pin-compatible, requiring layout revision and firmware adaptation.

Availability

AD7812YRUZ is available at Aetrix Electronics and suitable for industrial sensor interfaces, motor control feedback systems, and portable data loggers requiring stable component supply and long-term production continuity.

Supply support for AD7812YRUZ 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 specifically for cost-sensitive, space-constrained embedded systems requiring multichannel data acquisition with minimal external components and flexible power management.

FAQ

What is the maximum sampling rate supported by the AD7812YRUZ?

The AD7812YRUZ supports a maximum sampling rate of 350 kSPS, corresponding to a fixed 2.3 µs conversion time per sample. This rate is achievable across all eight input channels when using the internal reference and operating within the specified supply (2.7 V–5.5 V) and temperature (−40°C to +105°C) ranges. Throughput may decrease slightly under partial power-down or external reference conditions due to settling requirements.

Does the AD7812YRUZ require an external reference voltage?

No, the AD7812YRUZ does not require an external reference voltage because it integrates a 2.5 V ±2.5% internal reference. However, an external reference (1.2 V to VDD) can be applied to the VREF pin when higher accuracy or different full-scale range is needed; doing so requires setting the EXTREF bit in the control register and disables the internal reference circuitry.

How many analog input channels does the AD7812YRUZ support, and how are they configured?

The AD7812YRUZ supports eight analog input channels (VIN1–VIN8), configurable via its 10-bit control register as either 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). Configuration is determined by the DIF/SGL and VIN8/AGND bits in the register.

Can multiple AD7812YRUZ devices share the same serial interface bus?

Yes, two AD7812YRUZ devices-or one AD7812YRUZ and one AD7811-can share the same serial bus (SCLK, TFS, RFS, DIN, DOUT) using the A0 package address pin and corresponding address bit in the control register. Each device must have A0 hardwired to a unique logic level (high/low), and the control byte must match that address to enable communication without contention.

What power-saving modes are available on the AD7812YRUZ, and how are they activated?

The AD7812YRUZ offers full power-down (1 µA) and partial power-down (350 µA) modes, activated via PD1/PD0 bits in the control register or automatically after conversion when CONVST remains low. Full power-down disables all circuitry except wake-up logic; partial power-down retains the internal reference active. Both modes reduce power consumption significantly at lower throughput rates, such as 315 µW at 10 kSPS.