Analog Devices Inc. AD7810YR

Overview

AD7810YR from Analog Devices is a 10-bit successive approximation ADC with 2.3 µs conversion time, inherent track-and-hold functionality, and microcontroller-compatible serial interface. It operates from a single 2.7 V to 5.5 V supply, delivers ±1 LSB relative accuracy over –40°C to +105°C, and targets low-power portable instrumentation requiring precise analog-to-digital conversion.

For engineers reviewing the AD7810YR datasheet, AD7810YR pinout, AD7810YR application, or AD7810YR equivalent, key selection considerations include its SOIC-8 package compatibility, automatic power-down mode for battery life optimization, pseudo-differential input architecture, and guaranteed no-missing-codes performance at full 10-bit resolution.

Technical Context

The AD7810YR implements a charge redistribution DAC-based SAR architecture with internal oscillator and acquisition-phase sampling capacitor (3.5 pF). Its pseudo-differential input pair (VIN+, VIN–) supports offset cancellation in sensor front-ends while maintaining unipolar 0 V to VREF input range.

Conversion is initiated by a falling edge on CONVST, with result latched after 2.3 µs; serial data output (DOUT) is enabled by the rising edge of CONVST and synchronized to external SCLK. Two operating modes are supported: Mode 1 (continuous high-speed operation) and Mode 2 (automatic power-down between conversions), with power-up time of 1.5 µs.

Key Specifications

Pinout & Package

AD7810YR is housed in an 8-lead Small Outline IC (SOIC) package (SO-8), 3.9 mm × 4.9 mm body, 1.27 mm pitch, with standard gull-wing leads compatible with IPC-7351B footprint SOICN_8.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MAX11100ASA+, the AD7810YR uniquely balances 10-bit precision, ultra-low standby power, and integrated pseudo-differential topology in a legacy-compatible SOIC package - making it optimal for cost-sensitive, battery-constrained measurement systems where 10-bit fidelity is mandatory.

Availability

AD7810YR is available at Aetrix Electronics and suitable for battery-powered test equipment, portable environmental sensors, and industrial process monitoring requiring stable component supply and long-term manufacturability.

Supply support for AD7810YR 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, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The AD7810YR belongs to Analog Devices' legacy high-speed SAR ADC product line, engineered specifically for portable instrumentation and low-power industrial sensing where accuracy, speed, and energy efficiency must coexist in constrained form factors.

FAQ

What is the maximum sampling rate achievable with the AD7810YR?

The AD7810YR has a fixed 2.3 µs conversion time, enabling a theoretical maximum throughput of ~435 kSPS. However, actual sustained rate depends on microcontroller serial interface speed and timing margins - typical implementations achieve 100 kSPS in Mode 1 (continuous operation) and 10 kSPS in Mode 2 (power-down mode) while maintaining full specification compliance. The AD7810YR datasheet specifies timing parameters t3–t8 to guide interface design for reliable data capture.

Does the AD7810YR require an external reference voltage?

No, the AD7810YR does not require an external reference. Its VREF pin accepts 1.2 V to VDD, allowing direct connection to VDD for self-referenced operation - eliminating external reference components and reducing system cost and board area. When VREF = VDD, the analog input range becomes 0 V to VDD, simplifying front-end design for single-supply sensor interfaces. The AD7810YR maintains ±1 LSB relative accuracy across this configuration.

How does the pseudo-differential input of the AD7810YR improve measurement accuracy?

The AD7810YR's pseudo-differential input (VIN+, VIN–) enables system-level offset cancellation by applying a known DC bias to VIN– while routing the signal to VIN+. This removes fixed offsets - such as those from transducer excitation or amplifier input stages - without requiring additional op-amps. For example, applying 0.5 V to VIN– shifts the effective input span by that amount, provided VREF ≤ VDD − 0.5 V. The AD7810YR guarantees correct conversion only if VIN– remains stable to within ±0.5 mV during the 2.3 µs conversion window.

Can the AD7810YR be used in automotive applications?

The AD7810YR is specified for operation from –40°C to +105°C and meets industrial temperature grade requirements, but it is not AEC-Q200 qualified or automotive-grade screened. While its temperature range covers many under-hood environments, Analog Devices does not guarantee automotive reliability, qualification testing, or PPAP documentation for the AD7810YR. For automotive applications, designers should consider AEC-Q100 qualified alternatives such as the AD7476A-ARMZ or MAX11100ASA+ with explicit automotive qualification.

What is the purpose of the CONVST pin's dual functionality in the AD7810YR?

The CONVST pin in the AD7810YR serves two critical functions: (1) its falling edge initiates conversion and places the internal track-and-hold in hold mode, and (2) its rising edge enables the serial port - acting as a hardware chip-select signal. This dual role allows multiple AD7810YR devices to share a common SCLK/DOUT bus, with individual selection via dedicated CONVST lines. In Mode 2 operation, the state of CONVST at conversion completion determines whether the AD7810YR enters automatic power-down, directly linking timing control to power management.