Analog Devices Inc. AD667JNZ

Introduction to AD667JNZ Series from Analog Devices

The AD667JNZ belongs to Analog Devices’ renowned AD667 series, a line of integrated, high-precision digital-to-analog converters (DACs) offering 12-bit resolution and voltage output. Designed for demanding applications in industrial, instrumentation, and data acquisition systems, the AD667JNZ combines a high-stability voltage reference, double-buffered input latches, and a fast bipolar current steering DAC—all within a single-chip solution. The device’s microprocessor-compatible interface streamlines integration into both legacy and contemporary control systems, ensuring robust performance across a wide temperature range.

Main Characteristics of the AD667JNZ Series

Engineers evaluating the AD667JNZ will note its comprehensive feature set:

Complete 12-bit DAC function with integrated voltage reference and buffered output.

Double-buffered input latches enable direct interfacing to 4-, 8-, 12-, or 16-bit parallel buses, minimizing latency and spurious output transitions.

Guaranteed monotonicity and linearity over temperature, with maximum linearity error specified to ±1/2 LSB for the J grade and ±1/4 LSB for the K grade.

Fast settling time, reaching ±0.01% of full-scale within 3 to 4 microseconds under typical load conditions.

Low power consumption (approximately 300 mW including reference), vital for embedded and remote systems.

TTL and 5V CMOS compatible logic inputs streamline connection to standard digital logic.

MIL-STD-883 compliant versions available for defense and aerospace applications.

Functional Design of the AD667JNZ Series

At its heart, the AD667JNZ employs a high-speed bipolar current steering architecture. The digital input is handled through double-buffered latches—three four-bit registers in the first rank, feeding a 12-bit register in the second rank. This arrangement is specifically designed to avoid glitches and spurious outputs during data transitions, critical for systems demanding analog precision.

The internal voltage reference uses a buried Zener diode, delivering low noise, excellent stability, and minimal temperature drift—characteristics vital in calibration-sensitive applications. Laser-trimmed thin-film resistors matched to gain and offset settings further enhance accuracy and temperature stability.

Electrical Properties and Performance Metrics of the AD667JNZ Series

The AD667JNZ is optimized for both accuracy and speed.

Resolution: 12 bits

Input logic thresholds: Compatible with standard TTL and CMOS, logic "1" ≥2.0V, logic "0" ≤0.8V

Linearity error: ±1/2 LSB (J grade) at +25°C, guaranteed monotonicity

Differential linearity error: Maintained at <1 LSB for all grades

Output voltage range: Configurable for bipolar (±2.5V, ±5V, ±10V) and unipolar (0–5V, 0–10V) operation

Settling time: 3–4μs to ±0.01% of full scale, with small-signal transitions settling within 1μs

Drift: Gain TC as low as 5 ppm/°C; offset drift typically 1–3 ppm/°C

Supply voltage: ±12V or ±15V, with tolerance from ±11.4V to ±16.5V

Supply current: 8–12mA (analog), 20–25mA (digital)

Operating temperature: 0°C to +70°C (J grade); extended for A, B, S grades.

Output Settings and Range Adjustment for the AD667JNZ Series

The AD667JNZ provides exceptional flexibility in output range. Engineers can configure it for both bipolar and unipolar voltage outputs through simple pin connections and external resistors.

Bipolar ranges: ±10V, ±5V, ±2.5V

Unipolar ranges: 0–10V, 0–5V

Analog Devices’ laser-trimmed scaling resistors ensure that gain and offset drift are minimized and matched to internal components. For scenarios requiring fine adjustment, trimmers enable calibration to account for system-level variations or to match external reference voltages.

Reference Selections and Setup Procedures for the AD667JNZ Series

A distinctive advantage of the AD667JNZ is its internal buried Zener reference, trimmed to 10.00V with ≤±1% error. This buffer serves not only the DAC but can provide up to 0.1–1.0mA for external circuitry, lending long-term stability. Engineers can choose to utilize the internal reference or substitute their own, with recommended external reference voltages between +8V and +11V (for alternative full-scale ranges). When using external references, additional trim margin may be necessary due to internal reference tolerance.

The device is optimized for fixed-reference operation, but for designs requiring dynamic reference scaling, a multiplying DAC would be preferable. Fine modifications of scale are possible via small-value feedback resistors, though this will require awareness of temperature coefficient mismatches.

Connector and Logic Interface Integration in the AD667JNZ Series

Integration with digital systems is facilitated by the AD667JNZ’s microprocessor-compatible interface, supporting direct connection to data buses from 4–16 bits. Control logic employs up to four address inputs (A0–A3) and an active-low chip select (CS), providing multiple addressing and loading options.

Double-buffered organization ensures output stability during data changes.

Data formats (left-justified, right-justified) are supported, enabling seamless compatibility with 8-bit, 12-bit, or 16-bit microprocessors.

Input coding is positive-true binary; offset binary and two’s complement coding are possible with external logic modifications.

Fanout: Supports up to 100 TTL loads, making it suitable for systems with multiple parallel DACs.

The device’s inputs are robust against noise, with recommended grounding practices to minimize interference.

Packaging, Installation, and Environmental Factors of the AD667JNZ Series

The AD667JNZ is available in industry-standard through-hole 28-PDIP packages, facilitating robust mechanical attachment and excellent thermal performance. Other grades in the AD667 series broaden offering to plastic leaded chip carrier (PLCC), ceramic DIP, and LCC options for extended environmental conditions, including military-grade operation.

Moisture Sensitivity Level (MSL): 1 (Unlimited); RoHS3 compliant

REACH unaffected; suitable for international procurement

Storage and operating temperature ranges accommodate both commercial and harsh environments

Pinout accommodates optimal analog and digital grounding, critical for low-noise, high-speed circuits.

Possible Substitutes or Comparable Models for the AD667JNZ Series

Engineers seeking alternatives to the AD667JNZ within the AD667 series can identify several related grades, each tailored for specific accuracy and environmental needs:

AD667K: Enhanced linearity (±1/4 LSB), available in plastic and PLCC

AD667A/AD667B: Extended operation from –25°C to +85°C, ceramic DIP

AD667S: Military-grade performance from –55°C to +125°C, ceramic DIP or LCC

Other models in the AD667 family may be selected based on package requirements, accuracy specifications, and temperature range demands. When considering substitutes outside the series, engineers should assess devices offering a 12-bit resolution, fast settling times, integrated voltage reference, and compatible logic interface.

Conclusion

Analog Devices’ AD667JNZ stands out as a precision 12-bit DAC, meeting the needs of modern and legacy systems with performance, flexibility, and reliability. From its double-buffered latch design and integrated reference to its robust electrical specifications and versatile output configurations, the AD667JNZ facilitates streamlined DAC integration in high-performance electronic systems. With multiple package and grade options, as well as alternative models for varying environmental requirements, the AD667 series offers a comprehensive platform for engineers and procurement professionals in the market for precision DAC solutions.