Analog Devices Inc. AD7810YN

Overview

AD7810YN from Analog Devices is a 10-bit successive approximation ADC with 2.3 µs conversion time, pseudo-differential analog input (VIN+, VIN–), and microcontroller-compatible 3-wire serial interface (CONVST, SCLK, DOUT). It operates from a single 2.7 V to 5.5 V supply, features inherent track-and-hold functionality, and is specified over –40°C to +105°C for battery-powered portable instrumentation.

For engineers reviewing the AD7810YN datasheet, AD7810YN pinout, AD7810YN application, or AD7810YN equivalent, key selection considerations include its automatic power-down mode (1 µA standby current), ±1 LSB relative accuracy, 58 dB SNR at 30 kHz input, 0 V to VREF analog input range, and compatibility with SPI/QSPI/PIC microcontrollers via edge-triggered serial control.

Technical Context

The AD7810YN implements a charge redistribution DAC architecture with internal oscillator and comparator-based successive approximation logic. 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 operating modes: Mode 1 (high-speed, no inter-conversion power-down, 2.3 µs fixed conversion time) and Mode 2 (automatic power-down after each conversion, effective conversion time = 1.5 µs power-up + 2.3 µs SAR, enabling 270 µW at 10 kSPS). Serial data output is enabled by rising edge of CONVST and clocked out on SCLK rising edges, with 10-bit straight-binary format.

Key Specifications

Pinout & Package

AD7810YN is housed in an 8-lead plastic dual-in-line package (DIP), 0.3" wide, with through-hole mounting and N-8 branding. Pin spacing is 0.1" (2.54 mm), compatible with standard PCB footprints and socketing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7811YN, AD7810YN saves one pin and reduces layout complexity where BUSY feedback is unnecessary; compared with ADS7822U, AD7810YN delivers superior power efficiency and built-in offset handling at the cost of 2-bit resolution-making it optimal for battery-constrained, offset-prone sensor interfaces.

Availability

AD7810YN is available at Aetrix Electronics and suitable for battery-powered test equipment, portable medical sensors, and industrial process transmitters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7810YN 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 company headquartered in Norwood, MA, specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The AD7810YN belongs to Analog Devices' legacy high-speed, low-power SAR ADC product line, designed specifically for space- and energy-constrained portable instrumentation where integration, accuracy, and temperature robustness are critical.

FAQ

What is the guaranteed operating temperature range for the AD7810YN?

The AD7810YN is fully specified and tested over –40°C to +105°C. This range is confirmed in the Ordering Guide and applies to all electrical parameters including conversion time, relative accuracy (±1 LSB), and power consumption. The plastic DIP package (N-8) maintains thermal performance across this span, making AD7810YN suitable for under-hood automotive or industrial enclosure environments.

Does the AD7810YN require an external reference voltage?

No, the AD7810YN does not require an external reference. Its VREF pin accepts 1.2 V to VDD, and connecting VREF directly to VDD establishes a 0 V to VDD analog input range-enabling self-referenced operation. This configuration eliminates external reference components and simplifies layout, as confirmed in the General Description and Typical Connection Diagram (Figure 6).

How does the automatic power-down mode function in the AD7810YN?

In automatic power-down mode (Mode 2), the AD7810YN powers down immediately after conversion completion when CONVST remains low. It wakes up on the next rising edge of CONVST, with a guaranteed 1.5 µs power-up time before conversion begins. This reduces average power to 270 µW at 10 kSPS, as measured and specified in the Power Dissipation table-ideal for intermittent-sampling battery applications.

Can the AD7810YN interface directly with an SPI host microcontroller?

Yes, the AD7810YN interfaces directly with SPI hosts using its 3-wire serial protocol (CONVST as chip-select enable, SCLK as clock, DOUT as data-out). No level-shifting or timing glue logic is needed. The rising edge of CONVST resets the internal bit counter, and data is clocked out MSB-first on SCLK rising edges-fully compatible with standard SPI frame formats as documented in the Serial Interface section.

What is the maximum recommended source impedance for the analog inputs of the AD7810YN?

The AD7810YN analog input sampling capacitor (3.5 pF) and internal multiplexer resistance (125 Ω) limit recommended source impedance to ≤2 kΩ for full accuracy. At higher impedances, acquisition time increases beyond the 100 ns specification, degrading THD and causing gain/offset errors. For sources >2 kΩ, an external op-amp buffer is required-per the DC Acquisition Time analysis in the datasheet.