Analog Devices Inc. AD7819YNZ

Overview

AD7819YNZ 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, 48 dB SNR at 30 kHz input, and automatic power-down mode consuming just 57.75 µW at 1 kSPS - ideal for battery-powered data acquisition in portable instrumentation.

For engineers reviewing the AD7819YNZ datasheet, AD7819YNZ pinout, AD7819YNZ application, or AD7819YNZ equivalent, key selection considerations include its dual-mode operation (high-speed Mode 1 vs. auto power-down Mode 2), TTL-compatible 3-state digital outputs (DB0–DB7), VREF range of 1.2 V to VDD, and verified compatibility with 8051, PIC16C6x/7x, and ADSP-21xx microcontrollers/DSPs.

Technical Context

The AD7819YNZ employs a charge redistribution DAC architecture with internal clock oscillator and three-state output drivers. Its control logic manages CONVST-triggered conversion initiation, BUSY signaling, and automatic power-up/power-down sequencing based on external CONVST state at end-of-conversion.

It supports two distinct operational modes: Mode 1 maintains full power between conversions for sustained 200 kSPS throughput; Mode 2 powers down after each conversion and powers up before the next, reducing average power by >99% at low throughput rates - enabled solely by timing the external CONVST signal relative to BUSY.

Key Specifications

Pinout & Package

AD7819YNZ is packaged in a 16-lead, 0.3" wide plastic DIP (N-16 package). Pin 1 is VREF; pin 3 is shared AGND; pins 8–15 are DB0–DB7 (TTL-compatible 3-state outputs); pin 16 is VDD. All digital I/Os meet standard TTL voltage thresholds (VINH ≥2.0 V, VINL ≤0.4 V).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7819YNZ, AD7820JRZ trades power efficiency and integration for raw speed and lacks auto power-down, while MAX1112CPE+ sacrifices parallel interface simplicity and conversion latency for lower quiescent power and smaller footprint - neither offers identical Mode 1/Mode 2 flexibility or TTL-compatible 8-bit bus timing.

Availability

AD7819YNZ is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor nodes, medical wearables, and motor control feedback systems requiring stable component supply across extended production lifecycles.

Supply support for AD7819YNZ 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 AD7819YNZ belongs to Analog Devices' legacy precision ADC product line, designed specifically for microprocessor-centric data acquisition systems demanding low power, parallel interface simplicity, and guaranteed monotonicity in harsh industrial environments.

FAQ

What is the maximum sampling rate achievable with AD7819YNZ?

The AD7819YNZ achieves a maximum throughput rate of 200 kSPS in Mode 1 (high-speed mode), where it remains powered up continuously between conversions. This requires strict adherence to timing constraints: the minimum interval between successive CONVST falling edges must be ≥4.5 µs (conversion time) plus read access time. In Mode 2 (auto power-down), maximum rate drops to ~50 kSPS due to 1.5 µs power-up overhead per conversion. The AD7819YNZ datasheet specifies 200 kSPS only under Mode 1 conditions with VDD = 3 V or 5 V and proper bus timing.

Does AD7819YNZ require an external reference voltage?

The AD7819YNZ does not require an external reference - it accepts VREF from 1.2 V to VDD, enabling direct connection to a well-decoupled VDD rail for 0 V to VDD input range. However, for improved accuracy and noise immunity, an external precision reference (e.g., ADR391) can be used. The AD7819YNZ input leakage is ±1 µA and input capacitance is 20 pF, so the reference source must drive this load without significant droop or phase shift. Using VDD as VREF simplifies design but ties full-scale range to supply tolerance.

How does the automatic power-down mode work on AD7819YNZ?

AD7819YNZ automatic power-down (Mode 2) is hardware-controlled: when the external CONVST pin is driven low before the BUSY signal falls at end-of-conversion, the device powers down immediately after conversion completes. It powers up again on the next rising edge of CONVST, with a fixed 1.5 µs power-up time. This eliminates software intervention - no registers or commands are involved. At 1 kSPS, this reduces average power to 57.75 µW (VDD = 3 V), making AD7819YNZ uniquely suited for intermittent-sampling applications like duty-cycled sensors.

Can AD7819YNZ interface directly with a 3.3 V microcontroller?

Yes, AD7819YNZ interfaces directly with 3.3 V microcontrollers. Its digital inputs (CONVST, CS, RD) accept VINH ≥2.0 V and VINL ≤0.4 V - fully compatible with 3.3 V TTL logic levels. Its 3-state outputs (DB0–DB7, BUSY) drive VOH ≥2.4 V at 200 µA and VOL ≤0.4 V, meeting 3.3 V system requirements. When VDD = 3.3 V, the AD7819YNZ consumes 10.5 mW in normal operation and maintains all AC/DC specifications, including 48 dB SNR and ±0.5 LSB linearity, as verified in the datasheet.

What package type is used for AD7819YNZ?

AD7819YNZ uses a 16-lead, 0.3" wide plastic dual-in-line package (DIP), designated N-16 in Analog Devices' ordering guide. This through-hole package features 0.1" lead pitch, 0.3" body width, and JEDEC-standard pinout. It is RoHS-compliant and rated for operation from –40°C to +125°C. The N-16 package provides robust mechanical stability and ease of prototyping, distinguishing AD7819YNZ from SOIC (R-16A) and TSSOP (RU-16) variants of the same silicon.