Analog Devices Inc. AD676TD/883B

Overview

AD676TD/883B from Analog Devices is a 16-bit successive-approximation analog-to-digital converter (SAR ADC) with on-chip sample-hold, autocalibration, and parallel digital output. It delivers 100 kSPS conversion rate (10 µs total time), ±1 LSB INL (B-grade), –97 dB THD, 90 dB S/(N+D), and 1 MHz full-power bandwidth. It operates from +5 V (VDD), ±12 V (VCC/VEE) supplies and targets precision instrumentation and signal processing systems requiring dc accuracy and dynamic performance.

For engineers reviewing the AD676TD/883B datasheet, AD676TD/883B pinout, AD676TD/883B application, or AD676TD/883B equivalent, key selection considerations include its MIL-STD-883B-screened 28-pin ceramic DIP package, bipolar input range (±VREF), twos-complement output coding, calibration timing (85,530 CLK cycles), and strict power supply rejection (±1 LSB) across all rails.

Technical Context

The AD676TD/883B implements a switched-capacitor charge-redistribution SAR architecture segmented across two monolithic chips-an analog BiMOS II ADC die and a digital DSP CMOS controller die-housed in one hermetic ceramic package. Its autocalibration uses an on-chip microcontroller and calibration DAC to measure and correct capacitor mismatch errors for the MSB through bit 9, storing correction values in RAM for real-time compensation.

Conversion is initiated by the falling edge of SAMPLE, followed by exactly 17 CLK cycles; BUSY goes HIGH at tSB after SAMPLE low and remains asserted until data is valid on the 17th rising CLK edge. Aperture jitter is specified at 100 ps, aperture delay at 6 ns, and input settling time at 2 µs-enabling accurate sampling of fast-slewing signals up to 1 MHz full-power bandwidth.

Key Specifications

Pinout & Package

AD676TD/883B is housed in a 28-pin side-brazed ceramic DIP (package option D-28), screened per MIL-STD-883B, with hermetic sealing and lead finish suitable for military/aerospace applications. Pin assignments are validated per Analog Devices AD676 datasheet Rev. A.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with AD676TD/883B, AD676JD trades military reliability for cost and volume availability, while ADS8860 replaces parallel bus and dual-supply complexity with speed and integration-but lacks autocalibration, on-chip SHA, and MIL-qualified robustness.

Availability

AD676TD/883B is available at Aetrix Electronics and suitable for aerospace telemetry, high-reliability instrumentation, and defense electronics requiring stable component supply, long-lifecycle support, and traceable MIL-qualified sourcing.

Supply support for AD676TD/883B 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.

The AD676 family was designed specifically for precision measurement and signal processing applications demanding both dc accuracy (±2 LSB INL) and ac performance (90 dB S/(N+D)), targeting military, aerospace, and industrial systems where calibration stability and rugged packaging are essential.

FAQ

What is the operating temperature range for AD676TD/883B?

The AD676TD/883B is qualified per MIL-STD-883B for operation from –40°C to +85°C (B-grade). This range is verified through temperature cycling, parametric testing, and burn-in per Method 5005. All dc and ac specifications-including ±2 LSB INL, –92 dB THD, and 86 dB S/(N+D)-are guaranteed across this full military temperature range, making AD676TD/883B suitable for harsh-environment deployment where commercial-grade ADCs would fail.

Does AD676TD/883B require an external reference voltage?

Yes, AD676TD/883B requires an external precision voltage reference applied to the VREF pin. It accepts 5 V to 10 V inputs, with full-scale range set to ±VREF (e.g., ±10 V). The device does not include an internal reference; reference stability directly impacts gain error and drift performance. For optimal results, Analog Devices recommends low-noise, low-drift references such as the REF02 or ADR44x series, decoupled with 0.1 µF ceramic capacitors close to the VREF pin.

How is autocalibration performed on AD676TD/883B?

Autocalibration on AD676TD/883B is initiated by taking CAL HIGH (asynchronous reset), then LOW. The process executes in 85,530 clock cycles, during which internal capacitor mismatches for bits 1–9 are measured and correction values stored in on-chip RAM. Calibration completes when BUSY goes LOW. AD676TD/883B achieves full 16-bit accuracy only after calibration; uncalibrated operation degrades resolution to ~10 bits. Power-up calibration is recommended, after supplies and VREF stabilize.

What are the power supply requirements for AD676TD/883B?

AD676TD/883B requires three independent supplies: VCC = +12 V ±5%, VEE = –12 V ±5%, and VDD = +5 V ±10%. Total power consumption is 360–480 mW. Critical design practices include separate analog (AGND) and digital (DGND) ground planes joined at a single point near the AD676TD/883B, plus 0.1 µF ceramic decoupling capacitors placed within 2 mm of each supply pin. VEE connects internally to the ceramic package lid, which must be thermally and electrically grounded.

Is AD676TD/883B pin-compatible with other AD676 variants?

Yes, AD676TD/883B shares identical pinout and electrical behavior with all AD676 family members in the 28-pin ceramic DIP package (e.g., AD676AD, AD676BD, AD676KD). Differences lie solely in screening level (MIL-STD-883B), temperature grade (B-grade = –40°C to +85°C), and tested performance limits (e.g., INL, S/(N+D)). No PCB layout changes are required when substituting AD676TD/883B for another AD676 D-28 variant-only qualification documentation and lot traceability differ.