Analog Devices Inc. AD7810YRM

Overview

AD7810YRM from Analog Devices is a 10-bit successive approximation ADC with 2.3 µs conversion time, pseudo-differential analog input (VIN+, VIN–), microcontroller-compatible 3-wire serial interface (CONVST/SCLK/DOUT), and automatic power-down mode - designed for low-power battery-operated measurement systems operating from 2.7 V to 5.5 V supply.

For engineers reviewing the AD7810YRM datasheet, AD7810YRM pinout, AD7810YRM application, or AD7810YRM equivalent, key selection considerations include guaranteed 10-bit no-missing-codes performance over –40°C to +105°C, ±1 LSB relative accuracy, 58 dB SNR at 30 kHz input, 270 µW power at 10 kSPS, and microSOIC-8 (RM-8) package compatibility with space-constrained portable designs.

Technical Context

The AD7810YRM implements a charge redistribution DAC-based SAR architecture with inherent track-and-hold functionality, enabling single-cycle acquisition without external components. Its pseudo-differential input structure allows offset cancellation by applying system offset to VIN– while measuring signal on VIN+ - provided VIN– variation stays within ±0.5 LSB during conversion.

It supports two distinct operating modes: Mode 1 (high-speed, no power-down between conversions, 2.3 µs conversion, up to ~350 kSPS depending on SCLK speed) and Mode 2 (automatic power-down after each conversion, 1.5 µs wake-up + 2.3 µs conversion, optimized for 1–100 kSPS with sub-mW average power).

Key Specifications

Pinout & Package

AD7810YRM is housed in an 8-lead microSOIC package (RM-8 footprint, 3 mm × 3 mm, 0.65 mm pitch), specified for industrial temperature range (–40°C to +105°C).

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 AD7810YRM uniquely balances 10-bit accuracy, ultra-low standby power (1 µA), pseudo-differential input for offset cancellation, and wide 2.7–5.5 V operation - making it optimal for battery-powered, space-constrained, and thermally sensitive applications requiring robustness across industrial temperatures.

Availability

AD7810YRM is available at Aetrix Electronics and suitable for battery-powered test equipment, portable medical sensors, industrial sensor transmitters, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7810YRM 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 since 1965.

The AD7810YRM belongs to Analog Devices' precision data acquisition portfolio, engineered specifically for low-power, high-accuracy, single-supply ADC applications in portable and embedded instrumentation where size, thermal profile, and long-term stability are critical.

FAQ

What is the guaranteed operating temperature range for the AD7810YRM?

The AD7810YRM is fully specified from –40°C to +105°C, with all key parameters - including ±1 LSB relative accuracy, 58 dB SNR, and 2.3 µs conversion time - guaranteed across this industrial temperature range. This makes the AD7810YRM suitable for under-hood automotive, factory-floor, and outdoor-deployed instrumentation where ambient conditions exceed commercial-grade limits. The Y-grade suffix explicitly denotes this extended temperature qualification.

Does the AD7810YRM require an external reference voltage?

No, the AD7810YRM does not require an external reference. Its VREF pin accepts voltages from 1.2 V up to VDD, allowing direct connection to the supply rail - eliminating external reference components and reducing BOM cost and board area. When VREF = VDD, the analog input range becomes 0 V to VDD, enabling true ratiometric operation ideal for bridge sensor interfaces and battery-monitoring applications where supply variation must not affect measurement accuracy.

How does the automatic power-down mode work in the AD7810YRM?

The AD7810YRM enters automatic power-down mode when the CONVST pin is held low at the end of a conversion. It wakes up on the next rising edge of CONVST (taking 1.5 µs), then begins conversion on the subsequent falling edge. This sequence reduces average power to 270 µW at 10 kSPS and 2.7 mW at 100 kSPS. Unlike forced shutdown, this mode preserves serial interface functionality during power-down - allowing data readout without re-enabling logic, which simplifies firmware design for intermittent sampling applications.

Can the AD7810YRM interface directly with common microcontrollers like the PIC16 or STM32?

Yes, the AD7810YRM features a 3-wire serial interface (CONVST/SCLK/DOUT) compatible with SPI, QSPI, and PIC synchronous serial protocols without external level shifters or glue logic. Its CONVST pin serves as both conversion trigger and serial port enable - functioning as a hardware chip select. Timing is validated for SCLK pulse widths ≥25 ns, supporting MCU clock speeds up to ~40 MHz. For 8051 interfaces, SCLK inversion is required per the datasheet, but most modern ARM Cortex-M and PIC devices connect directly using standard SPI master mode.

What is the meaning of "pseudo-differential input" in the AD7810YRM?

The AD7810YRM's pseudo-differential input uses VIN+ as the active signal path and VIN– as a reference node - not a true differential pair. During conversion, the internal sampling capacitor connects to VIN–, enabling offset cancellation when a known system offset (e.g., 0.5 V) is applied there. However, VIN– must remain stable within ±0.5 LSB during the 2.3 µs conversion window; otherwise, code errors occur. This architecture provides offset rejection benefits of differential inputs while retaining simplicity and cost advantages of single-ended front-ends - confirmed in the AD7810YRM's functional block diagram and Figure 8 of its datasheet.