Analog Devices Inc. AD7812YR-REEL7

Overview

AD7812YR-REEL7 from Analog Devices is a 10-bit, 8-channel single-supply sampling ADC with 350 kSPS throughput, on-chip 2.5 V ±2.5% reference, and DSP/microcontroller-compatible serial interface. It operates from 2.7 V to 5.5 V, features pseudo-differential input configuration, and supports automotive-grade temperature range (–40°C to +105°C). Used in industrial sensor data acquisition systems requiring compact, low-power analog front ends.

For engineers reviewing the AD7812YR-REEL7 datasheet, AD7812YR-REEL7 pinout, AD7812YR-REEL7 application, or AD7812YR-REEL7 equivalent, key selection considerations include its 8 single-ended / 4 pseudo-differential input channels, 2.3 µs conversion time, automatic power-down modes (315 µW @ 10 kSPS), 20-lead SOIC package, and compatibility with shared serial bus architectures via A0 address pin.

Technical Context

The AD7812YR-REEL7 implements a charge redistribution successive approximation ADC architecture with integrated track-and-hold amplifier and programmable input multiplexer. Its control register enables dynamic reconfiguration of all eight analog inputs as either single-ended (vs. AGND) or pseudo-differential pairs (e.g., VIN1–VIN2, VIN3–VIN4).

Serial communication uses three-wire frame-sync protocol (TFS/RFS/SCLK) with 10-bit control word write and 10-bit conversion result readback. Hardware convert start is edge-triggered via CONVST, while software start is enabled by setting the CONVST bit in the control register - both initiate conversion 400 ns after register write completion.

Key Specifications

Pinout & Package

AD7812YR-REEL7 is housed in a 20-lead Small Outline IC (SOIC) package (R-20A), 7.5 mm × 12.8 mm body, 1.27 mm pitch, RoHS-compliant, tape-and-reel format (REEL7 = 1000-piece reel).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7812YR-REEL7, AD7812YRUZ-REEL7 offers identical functionality in a smaller package but with reduced thermal margin, while ADS7822U trades channel count and integrated reference for higher resolution and simpler interface - neither is pin-compatible, but both serve overlapping industrial sensing roles.

Availability

AD7812YR-REEL7 is available at Aetrix Electronics and suitable for industrial motor control, automotive climate systems, PLC analog input modules, and portable medical monitoring requiring stable component supply and long-term production continuity.

Supply support for AD7812YR-REEL7 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, founded in 1965 and headquartered in Wilmington, MA.

The AD7811/AD7812 product line was designed for cost-sensitive, space-constrained embedded systems needing multichannel data acquisition with minimal external components - targeting automotive, industrial, and instrumentation markets.

FAQ

What is the maximum sampling rate supported by the AD7812YR-REEL7?

The AD7812YR-REEL7 supports a maximum sampling rate of 350 kSPS, corresponding to a 2.3 µs conversion time. This rate is achievable across all eight input channels when using the internal reference and operating within the specified supply (2.7 V–5.5 V) and temperature (–40°C to +105°C) ranges. At lower throughput rates, automatic power-down reduces average current consumption significantly - e.g., 315 µW at 10 kSPS with VDD = 3 V.

Does the AD7812YR-REEL7 require an external reference voltage?

No, the AD7812YR-REEL7 includes an on-chip 2.5 V ±2.5% reference that is fully functional out-of-the-box. 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 disables the internal reference and reduces supply current by ~1 mA. The CREF pin must be decoupled with a 10 nF capacitor regardless of reference source.

How many analog input channels does the AD7812YR-REEL7 support, and how are they configured?

The AD7812YR-REEL7 supports eight analog input channels (VIN1–VIN8), configurable via its 10-bit control register as either eight single-ended inputs referenced to AGND or four pseudo-differential pairs (VIN1–VIN2, VIN3–VIN4, VIN5–VIN6, VIN7–VIN8). The VIN8/AGND and DIF/SGL bits determine mode selection, and CH2–CH0 bits select the active channel - all settings take effect immediately upon control register write.

Can multiple AD7812YR-REEL7 devices share the same serial interface bus?

Yes, two AD7812YR-REEL7 devices (or one AD7812YR-REEL7 and one AD7811) can share the same TFS/RFS/SCLK/DIN/DOUT bus using the A0 package address pin and the A0 bit in the control register. When A0 is hardwired high on one device and low on the other, only the device whose A0 pin matches the A0 bit in the transmitted control word will respond - enabling coordinated 12-channel acquisition without additional GPIOs or bus switches.

What is the power consumption of the AD7812YR-REEL7 in full power-down mode?

In full power-down mode (PD1=PD0=0), the AD7812YR-REEL7 draws a maximum of 1 µA from VDD, as specified in the Y-version electrical characteristics table. This state disables the internal reference, oscillator, and digital logic - resulting in total shutdown except for basic leakage paths. Wake-up time from full power-down is 1.5 µs (tPOWER-UP), measured from the rising edge of CONVST.