Analog Devices Inc. 5962-9559201MEA

Overview

AD677JN from Analog Devices is a 16-bit, 100 kSPS autocalibrating successive-approximation ADC with on-chip sample-hold, serial output, ±5 V to ±10 V input range, and 1 MHz full-power bandwidth-used in precision instrumentation and data acquisition systems requiring high dc accuracy and dynamic performance.

For engineers reviewing the AD677JN datasheet, AD677JN pinout, AD677JN application, or AD677JN equivalent, key selection criteria include integral nonlinearity (±1 LSB typ), THD (–99 dB), S/(N+D) (92 dB), aperture jitter (100 ps), and dual-supply operation (+12 V/–12 V analog, +5 V digital).

Technical Context

The AD677JN implements a switched-capacitor charge-redistribution SAR architecture with on-chip microcoded controller and dual-die construction (BiMOS II analog + DSP CMOS digital chip). It performs 17-clock-cycle conversions with twos-complement serial output synchronized to SCLK.

Autocalibration corrects capacitor-matching errors via internal DAC and RAM-stored correction coefficients, enabling ±1 LSB INL without external trims. Input sampling is controlled by SAMPLE pin with 2 µs settling time, 6 ns aperture delay, and remote AGND SENSE for ground-referenced signal sources.

Key Specifications

Pinout & Package

AD677JN is housed in a 16-pin 0.3" narrow-body plastic DIP (N-16 package) with dual ground separation (AGND and DGND), dedicated analog reference (VREF), and isolated analog/digital supplies (VCC/VEE/VDD).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7606-6 and ADS8860, the AD677JN delivers best-in-class dc accuracy (±1 LSB INL) and lowest aperture jitter (100 ps), making it optimal for metrology-grade single-channel applications where long-term stability and minimal user calibration are mandatory.

Availability

AD677JN is available at Aetrix Electronics and suitable for high-accuracy data loggers, industrial process monitoring, test & measurement equipment, and medical signal acquisition requiring stable component supply and long-lifecycle support.

Supply support for AD677JN 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 Norwood, MA.

The AD677JN belongs to Analog Devices' precision SAR ADC product line, engineered for applications demanding uncompromised dc accuracy, low noise, and robust dynamic performance in instrumentation and industrial control systems.

FAQ

What is the maximum recommended clock frequency for reliable operation of the AD677JN?

The AD677JN requires a minimum CLK period of 480 ns (2.08 MHz max), but 580 ns (1.72 MHz) is recommended for optimal accuracy over temperature. Exceeding this limit risks violating tCLK timing margins, degrading INL and THD. The device uses 17 CLK pulses per conversion, so 100 kSPS operation requires ≥1.7 MHz clock-verified in datasheet Figure 2 and Timing Specifications table.

Does the AD677JN require external calibration components or user trimming?

No, the AD677JN does not require external calibration components or user trimming. Its on-chip autocalibration circuit measures and stores capacitor-matching error corrections in internal RAM during each CAL cycle. Post-calibration, AD677JN achieves ±1 LSB INL without any external adjustments-confirmed in Product Highlights and Functional Description sections.

Can the AD677JN operate with a 5 V reference voltage, and how does that affect its specifications?

Yes, the AD677JN supports VREF from 5 V to 10 V. At 5 V reference, full-scale input range is ±5 V, power consumption drops to 360 mW (vs. 450 mW at 10 V), and dynamic performance remains specified (e.g., 92 dB S/(N+D) maintained). DC specs like INL and offset error are unchanged-per DC Specifications table footnote 4 and Applications section recommendations.

What is the purpose of the AGND SENSE pin on the AD677JN, and how should it be connected?

The AGND SENSE pin on the AD677JN provides remote sensing of the analog ground potential at the signal source to compensate for voltage drops in ground traces. It must be connected directly to the local ground reference point of the input signal source-not to the ADC's AGND pad-to eliminate ground-loop-induced offset errors, as detailed in the Analog Input section and Figure 4 grounding diagram.

How does the AD677JN handle out-of-range input voltages, and what output coding is used?

The AD677JN limits output coding for out-of-range inputs using twos-complement format: inputs exceeding +FS output 011...11; inputs below –FS output 100...00. This clamping behavior prevents erroneous code transitions and ensures deterministic saturation-explicitly defined in Table I and General Conversion Guidelines section of the datasheet.