Analog Devices Inc. AD7811YR

Overview

AD7811YR from Analog Devices is a 10-bit, 4-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 for industrial sensor signal conditioning.

For engineers reviewing the AD7811YR datasheet, AD7811YR pinout, AD7811YR application, or AD7811YR equivalent, key selection considerations include its 2.3 µs conversion time, ±1 LSB relative accuracy, 16-pin SOIC package, and hardware/software-controlled power-down modes for low-power embedded data acquisition.

Technical Context

The AD7811YR implements a charge redistribution DAC architecture with internal clock oscillator and comparator-based successive approximation logic. Its analog front end includes a track-and-hold amplifier with 200 ns acquisition time and configurable input multiplexing across four analog inputs (VIN1–VIN4).

Serial communication uses a 3-wire interface (SCLK, RFS/TFS, DIN/DOUT) with frame-sync control and 10-bit control register addressing. The device supports dual power-down modes-full (1 µA) and partial (350 µA)-triggered by CONVST edge or software control via PD1/PD0 bits.

Key Specifications

Pinout & Package

AD7811YR is housed in a 16-lead Small Outline IC (SOIC) package (R-16A), 7.5 mm × 10.3 mm, with standard 1.27 mm pitch and gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7811YN and AD7812YR, the AD7811YR delivers the best balance of compact 16-pin SOIC packaging, proven 4-channel performance, and lowest system-level BOM cost-making it the preferred choice for production-grade industrial data acquisition where channel count and board space are tightly constrained.

Availability

AD7811YR is available at Aetrix Electronics and suitable for industrial sensor interface, portable data logging, motor control feedback, and DSP-based audio preprocessing requiring stable component supply and long-term manufacturability.

Supply support for AD7811YR 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, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD7811YR belongs to Analog Devices' precision SAR ADC product line, engineered for low-power, high-speed data acquisition in resource-constrained embedded systems where accuracy, small size, and serial interface simplicity are critical.

FAQ

What is the maximum sampling rate supported by the AD7811YR?

The AD7811YR supports a maximum throughput rate of 350 kSPS, corresponding to a guaranteed maximum conversion time of 2.3 µs. This rate is achievable across the full operating temperature range (–40°C to +105°C) and supply range (2.7 V to 5.5 V), with timing validated per the AD7811/AD7812 Rev. C datasheet Table "TIMING CHARACTERISTICS".

Does the AD7811YR require an external reference voltage?

No, the AD7811YR includes an integrated 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 it to the VREF pin-this action powers down the internal reference to reduce current draw by ~1 mA.

Can multiple AD7811YR devices share the same serial bus?

Yes, two AD7811YR devices can share one 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, each responds only to control words matching its address-enabling coordinated 8-channel acquisition without additional GPIO or bus switches.

What power-down modes does the AD7811YR support?

The AD7811YR supports three power-down states: full power-down (1 µA quiescent current), partial power-down with internal reference active (350 µA), and normal operation (3.5 mA). These are selected via PD1/PD0 bits in the control register or automatically triggered by the CONVST signal's post-conversion state.

Is the AD7811YR pin-compatible with the AD7812YR?

No, the AD7811YR (16-pin SOIC) and AD7812YR (20-pin SOIC) have different pin counts and layouts. While both share identical signal naming and functional behavior on overlapping pins (e.g., VREF, SCLK, CONVST), the AD7812YR adds VIN5–VIN8, CH2, and additional ground/power connections-requiring separate PCB footprints and layout.