Analog Devices Inc. AD7811YN

Overview

AD7811YN 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 with 2.3 µs conversion time, and supports pseudo-differential or single-ended input configurations - used in industrial sensor signal conditioning and embedded data acquisition systems.

For engineers reviewing the AD7811YN datasheet, AD7811YN pinout, AD7811YN application, or AD7811YN equivalent, key selection considerations include its 4-channel analog input flexibility, internal reference accuracy (±2.5%), 10-bit relative accuracy (±1 LSB), power-down modes (full/partial), and compatibility with multipackage serial bus sharing via A0 address pin.

Technical Context

The AD7811YN implements a charge redistribution DAC architecture with an integrated oscillator and comparator-based successive approximation logic. Its analog front-end includes configurable input multiplexing (four single-ended or three pseudo-differential channels referenced to VIN4 or AGND) and a dedicated CREF pin for 10 nF decoupling of the internal 2.5 V reference.

Digital control is executed via a 10-bit write-only register accessed through a 3-wire serial interface (SCLK, TFS, DIN), supporting simultaneous write/read operations and hardware/software convert start (CONVST edge-triggered). Power management includes automatic full or partial power-down between conversions, reducing IDD to 1 µA (full) or 350 µA (partial) at idle.

Key Specifications

Pinout & Package

AD7811YN is housed in a 16-lead plastic dual-in-line package (mini-DIP, N-16), 0.3" wide, with through-hole mounting and industry-standard pin spacing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7811YR, AD7811YN offers through-hole assembly and higher thermal resistance, while AD7920BRMZ trades configurability and bus-sharing for increased resolution and speed - making AD7811YN optimal for cost-sensitive, multi-sensor industrial designs requiring flexible input topology and legacy-compatible packaging.

Availability

AD7811YN is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, embedded data acquisition, and automotive body control applications requiring stable component supply and long-term lifecycle support.

Supply support for AD7811YN 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 AD7811YN belongs to Analog Devices' precision SAR ADC product line, designed specifically for low-power, multi-channel data acquisition in space- and energy-constrained embedded systems where flexibility, integration, and reliability are critical.

FAQ

What is the maximum sampling rate supported by the AD7811YN?

The AD7811YN supports a maximum sampling rate of 350 kSPS, enabled by its 2.3 µs conversion time and integrated track-and-hold amplifier. This throughput 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 AD7811YN datasheet's t1 specification. The actual system rate may be reduced by serial interface overhead and power-down recovery delays.

Does the AD7811YN require an external reference, or does it include an internal one?

The AD7811YN includes an internal 2.5 V ±2.5% reference with 50 ppm/°C temperature coefficient, eliminating the need for an external reference in most applications. When higher accuracy is required, an external reference (1.2 V to VDD) can be applied to the VREF pin, and the EXTREF bit in the control register must be set to logic one to disable the internal reference and reduce power consumption by ~1 mA.

How many analog input channels does the AD7811YN support, and how are they configured?

The AD7811YN supports four analog input channels (VIN1–VIN4), configurable either as four single-ended inputs referenced to AGND or as three pseudo-differential pairs (e.g., VIN1–VIN4, VIN2–VIN4, VIN3–VIN4) via the VIN4/AGND and DIF/SGL bits in the 10-bit control register. This configuration is software-selectable and requires no external components, providing design flexibility for noise-sensitive measurements.

Can multiple AD7811YN devices share the same serial bus, and if so, how is addressing handled?

Yes, two AD7811YN devices (or one AD7811YN and one AD7812) can share the same serial bus using the A0 package address pin and the A0 bit in the control register. Each device's A0 pin is hardwired high or low, and only the device whose A0 pin matches the A0 bit in the transmitted control byte will respond to subsequent serial reads - enabling coordinated multi-channel acquisition without additional chip select lines.

What power-saving features does the AD7811YN offer, and how are they activated?

The AD7811YN offers full and partial power-down modes controlled by PD1/PD0 bits in the control register. Full power-down reduces IDD to 1 µA; partial power-down retains reference and logic bias at 350 µA. These modes activate automatically at the end of conversion when enabled, or can be forced via software. Power-up time is 1.5 µs, allowing rapid resumption of sampling in burst-mode applications.