Analog Devices Inc. AD7811YRUZ

Overview

AD7811YRUZ from Analog Devices is a 10-bit, 4-channel sampling ADC with successive approximation architecture, onboard track-and-hold and 2.5 V ±2.5% internal reference. 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. It is used in industrial sensor signal conditioning where low power, compact TSSOP-16 packaging and DSP/microcontroller-compatible serial interface are required.

For engineers reviewing the AD7811YRUZ datasheet, AD7811YRUZ pinout, AD7811YRUZ application, or AD7811YRUZ equivalent, key selection considerations include its 4-channel flexibility, 58 dB SNR at 30 kHz input, ±1 LSB relative accuracy, automatic power-down modes (315 µW @ 10 kSPS), and hardware/software-controlled CONVST and power management.

Technical Context

The AD7811YRUZ implements a charge redistribution DAC-based successive approximation converter with integrated track-and-hold amplifier and on-chip 2.5 V reference. Its serial interface uses three-wire RFS/TFS/SCLK signaling compatible with DSPs and microcontrollers, supporting simultaneous write-to-control-register and read-from-data-register operations.

Input channel configuration is fully software-defined via a 10-bit control register, enabling four single-ended inputs, three pseudo-differential channels referenced to VIN4, or two independent pseudo-differential pairs (VIN1/VIN2 and VIN3/VIN4). Power-down mode is selected by PD1/PD0 bits and triggered automatically post-conversion or manually via control register.

Key Specifications

Pinout & Package

AD7811YRUZ is housed in a 16-lead Thin Shrink Small Outline Package (TSSOP) with 0.65 mm lead pitch and exposed pad for thermal enhancement. Pin numbering follows standard JEDEC TSSOP-16 layout (1–16, top view, counterclockwise from notch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7811BRUZ, AD7811YRUZ provides guaranteed operation to +105°C and automotive qualification; compared with ADS7822U, it delivers faster throughput, integrated reference, and flexible input topology at the cost of 2-bit resolution-making it optimal for compact, low-power, multi-channel industrial sensing.

Availability

AD7811YRUZ is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, portable medical instrumentation, and energy meter front-ends requiring stable component supply and long-term production continuity.

Supply support for AD7811YRUZ 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.

The AD7811YRUZ belongs to Analog Devices' precision SAR ADC product line, designed specifically for space-constrained, low-power applications requiring flexible channel configuration, integrated references, and robust serial interfacing in harsh environments.

FAQ

What is the maximum sampling rate supported by the AD7811YRUZ?

The AD7811YRUZ supports a maximum sampling rate of 350 kSPS, corresponding to a fixed 2.3 µs conversion time. 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 parameters verified under worst-case conditions including t1 ≤ 2.3 µs and tPOWER-UP ≤ 1.5 µs.

Does the AD7811YRUZ require an external reference, or does it have an internal one?

The AD7811YRUZ includes an internal 2.5 V ±2.5% reference that is active by default. An external reference (1.2 V to VDD) may be used by connecting it to the VREF pin and setting the EXTREF bit in the control register; doing so powers down the internal reference circuitry and reduces current consumption by ~1 mA.

How many analog input channels does the AD7811YRUZ support, and how are they configured?

The AD7811YRUZ supports four analog input channels (VIN1–VIN4), configurable via its 10-bit control register as four single-ended inputs referenced to AGND, three pseudo-differential inputs referenced to VIN4, or two independent pseudo-differential pairs (VIN1/VIN2 and VIN3/VIN4). Configuration is software-selectable without hardware changes.

What power-saving features does the AD7811YRUZ offer, and how much power does it consume at low throughput?

The AD7811YRUZ offers automatic full and partial power-down modes triggered at the end of conversion. At 10 kSPS with VDD = 3 V, it consumes just 315 µW in auto full power-down mode-reducing average power by >97% versus normal operation (10.5 mW)-while retaining fast wake-up (<1.5 µs) for burst-mode acquisition.

Is the AD7811YRUZ pin-compatible with other members of the AD7811/AD7812 family, such as the AD7812?

No, the AD7811YRUZ is not pin-compatible with the AD7812 due to differing pin counts (16 vs 20) and signal assignments. However, both share identical serial interface protocols (RFS/TFS/SCLK/DIN/DOUT), control register structure, and functional behavior-enabling software reuse and multi-device bus sharing via the A0 address pin and control register addressing.