Analog Devices Inc. AD7819YRUZ-REEL

Overview

AD7819YRUZ-REEL from Analog Devices is an 8-bit, 200 kSPS successive approximation ADC with on-chip track-and-hold, 4.5 µs conversion time, and 8-bit parallel interface, operating from a single 2.7 V to 5.5 V supply. It delivers ±0.5 LSB relative accuracy and 48 dB SNR at 30 kHz input, targeting microprocessor- or DSP-based data acquisition in portable instrumentation and industrial monitoring.

For engineers reviewing the AD7819YRUZ-REEL datasheet, AD7819YRUZ-REEL pinout, AD7819YRUZ-REEL application, or AD7819YRUZ-REEL equivalent, key selection considerations include its automatic power-down mode (57.75 µW @ 1 kSPS), TTL-compatible 3-state outputs, VREF range of 1.2 V to VDD, and TSSOP-16 package compatibility with space-constrained embedded systems.

Technical Context

The AD7819YRUZ-REEL implements a charge redistribution DAC architecture with internal clock oscillator and dedicated CONVST-controlled timing logic. Its conversion cycle is initiated by falling edge of internally gated CONVST, synchronized to BUSY signal assertion.

It supports two operational modes: Mode 1 for continuous high-speed sampling (>100 kSPS) without inter-conversion power-down, and Mode 2 enabling automatic power-down between conversions-reducing average power to 57.75 µW at 1 kSPS while maintaining full parallel interface functionality during sleep.

Key Specifications

Pinout & Package

The AD7819YRUZ-REEL is housed in a 16-lead narrow-body thin shrink small outline package (TSSOP), 4.4 mm × 3.0 mm × 1.05 mm body height, with 0.65 mm lead pitch and exposed pad for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit SAR ADC applications.

Compared with ADS7822U and MAX1113EUA+, the AD7819YRUZ-REEL uniquely combines parallel bus compatibility, on-chip track-and-hold, and 2.7–5.5 V operation-making it optimal for legacy 8-bit microcontroller upgrades and mixed-voltage industrial controllers requiring minimal firmware changes.

Availability

AD7819YRUZ-REEL is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC analog inputs, and automotive cabin environment monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7819YRUZ-REEL 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, headquartered in Wilmington, MA.

The AD7819YRUZ-REEL belongs to Analog Devices' precision data acquisition IC family, designed specifically for cost-sensitive, space-constrained embedded systems requiring fast, low-power, microprocessor-compatible analog-to-digital conversion without external support components.

FAQ

What is the maximum sampling rate supported by the AD7819YRUZ-REEL?

The AD7819YRUZ-REEL supports a maximum throughput rate of 200 kSPS, achievable only in Mode 1 (high-speed continuous sampling). This requires the external CONVST signal to remain high between conversions so the device does not enter automatic power-down. At 200 kSPS, the minimum inter-conversion interval is defined by the 4.5 µs conversion time plus read timing overhead, as specified in the Mode 1 timing diagram of the AD7819YRUZ-REEL datasheet.

Does the AD7819YRUZ-REEL require an external clock source?

No, the AD7819YRUZ-REEL does not require an external clock source. It integrates a fully self-contained clock oscillator that drives the successive approximation register and internal timing logic. The only required control signal is CONVST, which initiates conversion cycles and determines power mode-eliminating clock routing, jitter concerns, and external component count in the AD7819YRUZ-REEL design.

Can the AD7819YRUZ-REEL operate with a 2.5 V reference voltage?

Yes, the AD7819YRUZ-REEL supports VREF from 1.2 V to VDD, so a 2.5 V reference is fully compliant when VDD ≥ 2.5 V. With VREF = 2.5 V, the analog input range becomes 0 V to 2.5 V, and the LSB size is 9.77 mV (2.5 V / 256). This configuration is commonly used with precision 2.5 V references like the REF02 or ADR3425 to achieve stable, low-drift measurements in industrial sensor interfaces using the AD7819YRUZ-REEL.

How does the automatic power-down mode function in the AD7819YRUZ-REEL?

In Mode 2, the AD7819YRUZ-REEL automatically powers down at the end of each conversion and powers up again just before the next conversion starts-triggered by the rising edge of CONVST. This reduces average power dissipation to 57.75 µW at 1 kSPS and scales linearly with throughput. The parallel interface remains functional during power-down, allowing uninterrupted CS/RD handshaking, making the AD7819YRUZ-REEL ideal for intermittent-sampling battery applications.

Is the AD7819YRUZ-REEL pin-compatible with other packages in the AD7819 family?

Yes, the AD7819YRUZ-REEL (TSSOP-16) shares identical pinout and electrical behavior with the AD7819YN (DIP-16) and AD7819YR (SOIC-16) variants. All three packages use the same 16-pin assignment: VREF, VIN, GND, CONVST, CS, RD, BUSY, DB0–DB7, and VDD in identical order. This enables drop-in replacement across form factors-allowing prototype validation in DIP, volume production in TSSOP, and legacy system repair using SOIC-without PCB redesign for the AD7819YRUZ-REEL.