Analog Devices Inc. AD7813YRUZ

Overview

AD7813YRUZ from Analog Devices is a 10-bit successive approximation ADC with 400 kSPS maximum throughput, on-chip track-and-hold and internal clock oscillator, operating from a single 2.7 V to 5.5 V supply. It delivers ±1 LSB relative accuracy, 58 dB SNR at 30 kHz input, and 2.3 µs conversion time - used in portable data acquisition systems requiring low-power, microprocessor-compatible analog digitization.

For engineers reviewing the AD7813YRUZ datasheet, AD7813YRUZ pinout, AD7813YRUZ application, or AD7813YRUZ equivalent, key selection considerations include its dual-read 8-bit+2-bit parallel interface, automatic power-down mode (34.6 µW @ 1 kSPS), 0 V to VREF analog input range, and TSSOP-16 package compatibility with space-constrained embedded designs.

Technical Context

The AD7813YRUZ implements a charge redistribution DAC architecture with internal 1.5 µs power-up timing and 100 ns track/hold acquisition time. Its conversion logic is triggered by CONVST edge control, with BUSY output signaling active conversion and dual-phase read access for 10-bit results.

It supports two operational modes: Mode 1 (continuous high-speed sampling ≥100 kSPS) and Mode 2 (automatic power-down between conversions), with dynamic performance specified at f_IN = 30 kHz and f_SAMPLE = 350 kHz - including –66 dB THD and –67 dB intermodulation distortion for DSP-grade signal fidelity.

Key Specifications

Pinout & Package

AD7813YRUZ is housed in a 16-lead Thin Shrink Small Outline Package (TSSOP), 4.4 mm × 5.0 mm body, 0.65 mm pitch, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7813YRUZ, AD7812YRUZ offers identical form-factor and interface but sacrifices 2 bits of resolution, while ADS7822U trades parallel simplicity for serial flexibility and lower speed - neither is pin- or code-compatible, requiring PCB and firmware revision.

Availability

AD7813YRUZ is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC analog input modules, and automotive cabin environment monitors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7813YRUZ 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 specializing in high-performance analog, mixed-signal, and digital signal processing ICs for precision instrumentation and industrial applications.

The AD7813YRUZ belongs to Analog Devices' legacy high-speed SAR ADC product line, designed specifically for microprocessor-based data acquisition systems needing low-power, single-supply, parallel-interface digitization with guaranteed 10-bit no-missing-code performance.

FAQ

What is the maximum sampling rate supported by the AD7813YRUZ?

The AD7813YRUZ supports a maximum throughput rate of 400 kSPS, achievable only in Mode 1 (high-speed continuous sampling). This requires the CONVST signal to remain high between conversions so the device does not enter automatic power-down. At 400 kSPS, the minimum inter-conversion interval is 2.5 µs, constrained by the 2.3 µs conversion time plus bus read overhead. The AD7813YRUZ datasheet confirms this rating under VDD = 3 V or 5 V with f_IN = 30 kHz test conditions.

How does the AD7813YRUZ handle 10-bit data output on an 8-bit bus?

The AD7813YRUZ uses a two-phase parallel read sequence: the first RD pulse (with CS low) places the 8 most significant bits (MSBs) on DB7–DB0, and the second RD pulse places the 2 least significant bits (LSBs) on DB7–DB6 while DB5–DB0 are forced low. This design allows full 10-bit resolution without widening the data bus. The AD7813YRUZ timing diagram (Figure 13) specifies a minimum 10 ns delay (t8) between MSB and LSB reads to ensure correct latching.

Can the AD7813YRUZ operate with VREF tied directly to VDD?

Yes, the AD7813YRUZ allows VREF to be connected directly to VDD, establishing a 0 V to VDD analog input range - provided VDD is stable and well-decoupled. The datasheet specifies VREF input range as 1.2 V to VDD, making this configuration valid for both 3.3 V and 5 V supplies. However, if higher precision is required, an external low-noise reference (e.g., ADR391) should be used instead of relying on VDD regulation. This applies equally to all operating conditions of the AD7813YRUZ.

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

The BUSY signal on the AD7813YRUZ is an active-high logic output that asserts during conversion and deasserts at completion, providing hardware synchronization for microprocessor read operations. It eliminates polling delays and enables interrupt-driven data capture - for example, triggering an ISR on falling edge to initiate the first 8-bit read. The AD7813YRUZ BUSY timing is tightly specified: it rises within 30 ns of CONVST falling edge and falls within 2.3 µs, aligning precisely with conversion duration.

Does the AD7813YRUZ require external components for basic operation?

Yes, the AD7813YRUZ requires at minimum: (1) a 0.1 µF ceramic + 10 µF bulk capacitor across VDD–GND for supply decoupling; (2) a clean analog ground connection; and (3) proper termination of unused digital inputs (e.g., CONVST pulled low at power-up per datasheet caution). While it includes an internal oscillator and track/hold, external VREF filtering (e.g., RC network) is recommended for high-accuracy applications. These requirements are explicitly documented in the AD7813YRUZ typical connection diagram (Figure 4) and Power-Up Times section.