Analog Devices Inc. AD779JNZ

Overview

AD779JNZ from Analog Devices is a complete 14-bit monolithic sampling ADC with integrated sample-hold amplifier, 5 V reference, clock generator, and 16-bit bus interface. It delivers 128 kSPS throughput, 1 MHz full-power bandwidth, 80 dB S/N+D (typ), 10 MΩ input impedance, and ±5 V / 0–10 V input range - enabling high-fidelity data acquisition in precision test equipment and industrial control systems.

For engineers reviewing the AD779JNZ datasheet, AD779JNZ pinout, AD779JNZ application, or AD779JNZ equivalent, this page provides verified technical context, real-world timing behavior, package-specific layout guidance, functional alternatives with documented differences, and supply-chain support for volume deployment in embedded measurement systems.

Technical Context

The AD779JNZ employs a recursive subranging architecture with flash converter circuitry and error correction to achieve 14-bit resolution at 128 kSPS. Its sample-hold amplifier supports 1.5 µs input settling time and 150 ps aperture jitter, enabling accurate digitization of fast-slewing signals up to 500 kHz full-linear bandwidth.

It operates from +5 V (VDD), +12 V (VCC), and –12 V (VEE) supplies, dissipating 560 mW (typ). The device uses Analog Devices' BiMOS process with laser-trimmed thin-film resistors for dc accuracy, and features factory-trimmed offset/gain/linearity - eliminating need for external calibration in most applications.

Key Specifications

Pinout & Package

AD779JNZ is supplied in a 28-pin plastic DIP (N-28) package with 0.6-inch width and through-hole mounting. Pin spacing follows JEDEC MS-001 standard; thermal resistance θ_JA = 65°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed sampling ADC applications.

Compared with AD779JNZ, AD7792BRUZ trades speed for ultra-high resolution and integrated signal conditioning, while ADS8505IPW offers higher sampling rate at the cost of increased BOM complexity and reduced out-of-box accuracy.

Availability

AD779JNZ is available at Aetrix Electronics and suitable for automated test equipment, industrial process monitoring, and medical instrumentation requiring stable component supply across long-lifecycle production programs.

Supply support for AD779JNZ 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 AD779 series was designed as a complete, self-contained sampling ADC family targeting precision measurement systems where integration, dc accuracy, and ac performance must coexist - notably in test & measurement, industrial automation, and medical diagnostics.

FAQ

What is the operating temperature range for the AD779JNZ?

The AD779JNZ is rated for 0°C to +70°C (J grade). This range is validated for all ac and dc specifications per the datasheet's AD779J/A/S column. Unlike K/B/T grades, dc parameters (e.g., INL, gain error) are specified as typical values rather than min/max limits - meaning performance meets or exceeds 0.12% gain error and ±2 LSB INL under typical conditions across this range.

Does the AD779JNZ require external calibration?

No, the AD779JNZ does not require external calibration for standard operation. It is factory-trimmed for offset, gain, and linearity, delivering ≤0.12% gain error and ≤±2 LSB INL without user adjustment. External trims (via R1/R2 in Figures 5–6) are optional and only needed when application-level accuracy demands exceed J-grade specifications - for example, in metrology-grade instruments requiring <0.05% gain drift over temperature.

Can the AD779JNZ operate from ±15 V supplies?

No, the AD779JNZ is not designed to operate from ±15 V supplies. Absolute maximum ratings specify VCC ≤ +18 V and VEE ≥ –18 V, but the device is characterized and guaranteed only for +12 V (VCC), –12 V (VEE), and +5 V (VDD). Operation outside these nominal supplies may cause parametric shift, increased power dissipation, or permanent damage - per Note 2 in the Absolute Maximum Ratings table.

What is the purpose of the BIPOFF pin on the AD779JNZ?

The BIPOFF pin (Pin 10) configures the AD779JNZ's input range and output coding format. When tied to AGND, it selects unipolar mode (0–10 V input, straight binary output); when tied to REFOUT, it selects bipolar mode (±5 V input, twos-complement output). This pin directly controls internal reference routing and digital encoding logic - no software register setting is involved, making mode selection hardware-determined and deterministic at power-up.

How does the AD779JNZ handle power-up initialization?

The AD779JNZ requires approximately 10 µs after power supplies stabilize to reset internal logic and enter a known operational state. During this period, SC, OE, and CS should remain inactive (high), and EOC remains high. After 10 µs, the device is ready for conversion - confirmed by EOC staying high until SC is pulsed low. This specification is explicitly stated in the "POWER-UP" section on page 8 of the datasheet.