Analog Devices Inc. AD7811YRZ-REEL

Overview

AD7811YRZ-REEL from Analog Devices is a 10-bit, 4-channel sampling ADC with successive approximation architecture, operating from a single 2.7 V to 5.5 V supply and delivering 350 kSPS throughput. It integrates an on-chip 2.5 V ±2.5% reference, track-and-hold amplifier, and DSP/microcontroller-compatible serial interface. It supports single-ended or pseudo-differential input configurations and is used in industrial sensor signal conditioning and embedded data acquisition systems.

For engineers reviewing the AD7811YRZ-REEL datasheet, AD7811YRZ-REEL pinout, AD7811YRZ-REEL application, or AD7811YRZ-REEL equivalent, key selection considerations include its 4-channel flexibility, 2.3 µs conversion time, ±1 LSB relative accuracy, 58 dB SNR at 30 kHz, and TSSOP-16 package compatibility with space-constrained PCB layouts.

Technical Context

The AD7811YRZ-REEL implements a charge redistribution DAC-based successive approximation converter with internal clock oscillator and configurable input multiplexing. Its control register enables software-selectable channel configuration (single-ended or pseudo-differential), programmable power-down modes (full or partial), and external reference enable via EXTREF bit.

It features hardware- and software-initiated conversion start (CONVST edge-triggered or CONVST bit in control register), dual ground separation (AGND/DGND), and serial bus sharing capability via A0 address pin and RFS/TFS frame sync logic - enabling multi-device daisy-chain or parallel configurations without external arbitration.

Key Specifications

Pinout & Package

AD7811YRZ-REEL is housed in a 16-lead Thin Shrink Small Outline Package (TSSOP) with 0.65 mm lead pitch, optimized for automated assembly and thermal performance (θ_JA = 115°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7811BRZ-REEL, the AD7811YRZ-REEL trades 0.5 LSB linearity for automotive-grade temperature range and lower cost; versus ADS7822U, it offers faster sampling and integrated reference at the expense of resolution - making AD7811YRZ-REEL optimal for cost-sensitive, space-constrained industrial sensing where 10-bit fidelity suffices.

Availability

AD7811YRZ-REEL is available at Aetrix Electronics and suitable for industrial sensor interface, embedded data logging, and motor control feedback requiring stable component supply and long-term production continuity.

Supply support for AD7811YRZ-REEL 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 AD7811YRZ-REEL belongs to Analog Devices' precision SAR ADC product line, designed specifically for low-power, multi-channel data acquisition in industrial automation, test equipment, and automotive subsystems.

FAQ

What is the maximum sampling rate supported by the AD7811YRZ-REEL?

The AD7811YRZ-REEL supports a maximum sampling rate of 350 kSPS, corresponding to a guaranteed 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), enabling real-time acquisition of signals with bandwidths up to approximately 175 kHz while maintaining specified SNR and THD performance.

Does the AD7811YRZ-REEL require an external reference voltage?

No, the AD7811YRZ-REEL does not require an external reference voltage. It includes an internal 2.5 V ±2.5% reference that can be used directly for analog input scaling from 0 V to VREF. An external reference (1.2 V to VDD) may be applied to the VREF pin only when higher precision or different input range is needed - in which case the EXTREF bit in the control register must be set to logic 1 to disable the internal reference.

How many analog input channels does the AD7811YRZ-REEL support, and how are they configured?

The AD7811YRZ-REEL supports four analog input channels (VIN1–VIN4). These can be configured in multiple topologies via its 10-bit control register: as four single-ended inputs referenced to AGND, as three pseudo-differential pairs referenced to VIN4, or as two independent pseudo-differential channels (VIN1/VIN2 and VIN3/VIN4). Configuration is fully software-controlled and non-volatile until rewritten.

Can multiple AD7811YRZ-REEL devices share the same serial interface bus?

Yes, two AD7811YRZ-REEL devices can share the same serial interface bus using the A0 package address pin and the A0 address bit in the control register. When A0 is hardwired high on one device and low on the other, and their respective control bytes contain matching A0 bits, only the addressed device responds to serial commands - allowing independent read/write operations without bus contention or additional logic.

What power-saving modes are available on the AD7811YRZ-REEL?

The AD7811YRZ-REEL offers two automatic power-down modes controlled by PD1/PD0 bits in the control register: full power-down (IDD ≤ 1 µA) and partial power-down (IDD ≤ 350 µA, internal reference active). Power state is determined at conversion end based on these bits. At 10 kSPS with VDD = 3 V, average power drops to 315 µW in full power-down mode - ideal for battery-operated or energy-conscious designs.