Analog Devices Inc. AD7811YNZ

Overview

AD7811YNZ from Analog Devices is a 10-bit, 4-channel, successive-approximation ADC with 2.3 µs conversion time, onboard 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, supports pseudo-differential or single-ended input configurations, and is used in automotive sensor signal conditioning and industrial data acquisition systems.

For engineers reviewing the AD7811YNZ datasheet, AD7811YNZ pinout, AD7811YNZ application, or AD7811YNZ equivalent, key selection considerations include its 350 kSPS throughput, ±1 LSB relative accuracy, 58 dB SNR at 30 kHz input, channel-to-channel isolation of –80 dB, and support for automatic power-down modes down to 1 µA.

Technical Context

The AD7811YNZ implements a charge redistribution DAC architecture with integrated track-and-hold, enabling precise sampling of analog inputs across four configurable channels. Its control register allows dynamic reconfiguration of input topology (single-ended vs. pseudo-differential) and software-initiated conversions.

It features dual power-down modes-full (1 µA) and partial (350 µA)-triggered via PD1/PD0 bits, and uses a hardware- or software-controlled CONVST signal to initiate conversion on the falling edge. The serial interface employs RFS/TFS framing synchronized to SCLK for compatibility with TI C5x/C6x and ADSP-21xx DSP families.

Key Specifications

Pinout & Package

AD7811YNZ is housed in a 16-lead plastic DIP (N-16 package), 0.3" wide, through-hole mountable with 0.1" pin pitch. Pin 1 is VREF; pin 16 is VDD; AGND (pin 4) and DGND (pin 9) are separate but internally connected at the die level for noise separation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7811YR and AD7812YN, the AD7811YNZ provides the lowest-cost, socket-compatible solution for 4-channel 10-bit sampling in through-hole designs, with identical electrical performance but distinct mechanical and layout implications.

Availability

AD7811YNZ is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC analog input modules, and portable medical instrumentation requiring stable component supply and long-term lifecycle support.

Supply support for AD7811YNZ 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.

The AD7811YNZ belongs to Analog Devices' precision SAR ADC product line, designed specifically for cost-sensitive, medium-speed data acquisition in automotive, industrial, and instrumentation applications where 10-bit resolution and low power are critical.

FAQ

What is the maximum sample rate supported by the AD7811YNZ?

The AD7811YNZ supports a maximum throughput rate of 350 kSPS, achieved with a 2.3 µs conversion time. This rate assumes optimal timing margins and proper setup of the serial interface (TFS, SCLK, RFS). At lower rates, automatic power-down modes reduce average current consumption-for example, 315 µW at 10 kSPS with VDD = 3 V. The AD7811YNZ does not require external clocking beyond SCLK for conversion timing.

Does the AD7811YNZ require an external reference voltage?

No, the AD7811YNZ includes an onboard 2.5 V ±2.5% reference that is fully functional without external components. A 10 nF capacitor on the CREF pin is required for stability. An external reference (1.2 V to VDD) may be used by connecting it to VREF and setting the EXTREF bit in the control register; doing so powers down the internal reference circuitry and reduces current draw by ~1 mA.

How is channel selection configured on the AD7811YNZ?

Channel selection on the AD7811YNZ is controlled via the 10-bit control register written through the serial interface. Bits CH1 and CH0, combined with VIN4/AGND and DIF/SGL settings, determine which of the four analog inputs (VIN1–VIN4) is sampled and how it is interpreted-either as single-ended w.r.t. AGND, pseudo-differential w.r.t. VIN4, or one of two independent pseudo-differential pairs. Configuration persists until a new control byte is written.

Can multiple AD7811YNZ devices share the same serial bus?

Yes, two AD7811YNZ devices (or one AD7811YNZ and one AD7812) can share the same serial bus using the A0 package address pin and the A0 bit in the control register. When A0 is hardwired low on one device and high on another, only the device whose A0 pin matches the A0 bit in the transmitted control byte will respond to subsequent reads or writes-enabling coordinated 8-channel acquisition without additional GPIOs.

What are the power-down modes available on the AD7811YNZ?

The AD7811YNZ supports two power-down modes controlled by PD1/PD0 bits: full power-down (1 µA quiescent current) and partial power-down (350 µA), where the internal reference remains active. Full power-down disables all circuitry except wake-up logic; partial retains reference and bias circuits for faster wake-up. Both modes can be triggered automatically after conversion or forced via control register write, enabling dynamic power management in battery-operated systems.