Analog Devices Inc. AD7813YRUZ-REEL7

Overview

AD7813YRUZ-REEL7 from Analog Devices is a 10-bit successive approximation ADC with on-chip track-and-hold, 2.3 µs conversion time, and 400 kSPS maximum throughput. It operates from a single 2.7 V to 5.5 V supply, features an 8-bit parallel interface for microprocessor/DSP interfacing, and supports automatic power-down mode (34.6 µW @ 1 kSPS). It is used in portable data acquisition systems requiring low-power, high-speed digitization of analog sensor signals.

For engineers reviewing the AD7813YRUZ-REEL7 datasheet, AD7813YRUZ-REEL7 pinout, AD7813YRUZ-REEL7 application, or AD7813YRUZ-REEL7 equivalent, key selection considerations include its 10-bit resolution with ±1 LSB relative accuracy, dual-read 8+2-bit parallel data access, 0 V to VREF analog input range, reference voltage flexibility (1.2 V to VDD), and TSSOP-16 package compatibility with space-constrained embedded designs.

Technical Context

The AD7813YRUZ-REEL7 implements a charge redistribution DAC architecture with internal clock oscillator and integrated track/hold amplifier. Its conversion process begins on the falling edge of CONVST and completes in ≤2.3 µs, with BUSY asserted high during conversion and deasserted upon result latching.

It supports two operational modes: Mode 1 (high-speed, no inter-conversion power-down) for ≥100 kSPS applications, and Mode 2 (automatic power-down between conversions) optimized for battery-powered systems. The 10-bit result is accessed via two sequential 8-bit reads - first for MSBs (DB7–DB0), second for LSBs (DB7–DB6 = bits 1:0, DB5–DB0 = 0).

Key Specifications

Pinout & Package

The AD7813YRUZ-REEL7 is housed in a 16-lead Thin Shrink Small Outline Package (TSSOP), RU-16 footprint, 4.4 mm × 5.0 mm body, 0.65 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7813YRUZ-REEL7, AD7812YRUZ sacrifices 2 bits of resolution for lower cost and power, while ADS7822U trades parallel simplicity for 12-bit precision and serial interface constraints - neither offers pin compatibility or identical functionality.

Availability

AD7813YRUZ-REEL7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial process monitoring, and automotive body control units requiring stable component supply, extended temperature support (−40°C to +105°C), and RoHS-compliant TSSOP packaging.

Supply support for AD7813YRUZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.

The AD7813 belongs to Analog Devices' legacy high-speed SAR ADC product line, designed specifically for microprocessor-centric data acquisition systems demanding low power, simple parallel interfacing, and guaranteed monotonicity in industrial and portable instrumentation.

FAQ

What is the maximum sampling rate achievable with the AD7813YRUZ-REEL7?

The AD7813YRUZ-REEL7 achieves a maximum throughput rate of 400 kSPS in Mode 1 (high-speed mode), where it remains powered up between conversions. This requires strict timing adherence: minimum delay between CONVST falling edges must exceed conversion time (2.3 µs) plus read time. At lower rates, Mode 2 auto power-down reduces average power but limits sustained throughput.

How is the 10-bit result read from the AD7813YRUZ-REEL7?

The AD7813YRUZ-REEL7 uses an 8-bit parallel interface with dual-read protocol: the first read (CS and RD low) outputs the 8 MSBs on DB7–DB0; the second read outputs the 2 LSBs on DB7 and DB6, with DB5–DB0 forced to zero. BUSY falling edge signals readiness for the first read; no third read is needed - subsequent reads repeat the MSB/LSB sequence.

Does the AD7813YRUZ-REEL7 require an external reference voltage?

The AD7813YRUZ-REEL7 accepts an external reference via VREF (Pin 1), but it can also use VDD as the reference by connecting VREF to VDD. The VREF input range is 1.2 V to VDD, enabling flexible scaling - for example, a 2.5 V reference yields 2.44 mV/LSB resolution. External reference must be low-noise and well-decoupled to maintain ±1 LSB accuracy.

What is the purpose of the BUSY signal on the AD7813YRUZ-REEL7?

The BUSY signal on the AD7813YRUZ-REEL7 is an active-high open-drain output that asserts during conversion and deasserts (goes low) when the 10-bit result is latched and ready for reading. It serves as a hardware interrupt trigger for microcontrollers (e.g., 8051, PIC16C6x), eliminating polling overhead and ensuring deterministic timing for data capture in real-time systems.

Can the AD7813YRUZ-REEL7 operate from a 3.3 V supply?

Yes, the AD7813YRUZ-REEL7 is fully specified for operation from 2.7 V to 5.5 V, including standard 3.3 V rails. At VDD = 3.3 V, it delivers 10.5 mW normal power dissipation and supports automatic power-down down to 34.6 µW at 1 kSPS. All DC and dynamic specifications - including ±1 LSB relative accuracy and 58 dB SNR - are guaranteed across this supply range and over −40°C to +105°C.