Analog Devices Inc. AD1674BR

Overview

AD1674BR from Analog Devices is a complete monolithic 12-bit, 100 kSPS analog-to-digital converter with integrated sample-and-hold amplifier (SHA), on-chip 10 V reference, and microprocessor-compatible three-state output buffers. It supports unipolar (0 V–10 V, 0 V–20 V) and bipolar (±5 V, ±10 V) input ranges, operates on ±12 V/±15 V analog and +5 V digital supplies, and delivers ±1/2 LSB integral nonlinearity at –40°C to +85°C.

For engineers reviewing the AD1674BR datasheet, AD1674BR pinout, AD1674BR application, or AD1674BR equivalent, this device serves as a drop-in upgrade to AD574A/AD674A in data acquisition systems requiring guaranteed AC performance (70 dB S/(N+D), –90 dB THD), full Nyquist-bandwidth SHA support, and flexible 8-/12-bit parallel interface timing in industrial control and test instrumentation.

Technical Context

The AD1674BR implements a successive approximation register (SAR) architecture with an integrated, user-transparent SHA that acquires to 12-bit accuracy within 1 µs and supports full Nyquist bandwidth operation up to 500 kHz linear bandwidth. Its BiMOS II process integrates high-precision bipolar analog circuitry-including laser-trimmed scaling and bipolar offset resistors-with CMOS digital logic for stable DC and dynamic AC performance.

It features dual-mode digital interface: full-control mode (using CE, CS, R/C, 12/8, A0) for multiplexed bus systems, and stand-alone mode (R/C edge-triggered, CE/12/8 tied HIGH) for dedicated channel applications-reducing aperture jitter to 250 ps and enabling precise timing-critical sampling.

Key Specifications

Pinout & Package

AD1674BR is supplied in a 28-lead plastic SOIC package (R-28), pin-compatible with AD574A/AD674A and suitable for surface-mount assembly with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with AD1674AR and AD7892BR, the AD1674BR uniquely combines ±1/2 LSB linearity, integrated SHA, bipolar input support, and industry-standard pinout-making it the optimal choice for drop-in upgrades and precision industrial DAQ where legacy compatibility and guaranteed AC specs are mandatory.

Availability

AD1674BR is available at Aetrix Electronics and suitable for industrial data acquisition, automated test equipment, medical instrumentation, and avionics signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD1674BR 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 AD1674BR belongs to Analog Devices' legacy precision SAR ADC product line, engineered for high-accuracy, wide-temperature industrial and military data acquisition where guaranteed AC/DC specifications, onboard reference, and pin compatibility with AD574A are essential.

FAQ

What is the maximum sampling rate of the AD1674BR?

The AD1674BR achieves a guaranteed 100 kSPS (10 µs conversion time) across its full operating temperature range of –40°C to +85°C. This rate is maintained in both 12-bit and 8-bit conversion modes, with 12-bit cycles completing in 9–10 µs and 8-bit cycles in 7–8 µs-enabling real-time capture of signals up to 50 kHz under Nyquist criteria. The AD1674BR's timing is fully specified and tested per the switching specifications table in Rev. C datasheet.

Does the AD1674BR require external calibration components?

No, the AD1674BR does not require external calibration components for basic operation. It includes factory-laser-trimmed scaling and bipolar offset resistors supporting four calibrated input ranges (±5 V, ±10 V, 0–10 V, 0–20 V). While unipolar and bipolar offset can be fine-tuned using the BIP OFF and REF IN nodes per Figure 11–12 of the datasheet, the AD1674BR meets all DC and AC specifications-including ±1/2 LSB INL and 70 dB S/(N+D)-without any external trims.

Can the AD1674BR operate with only +5 V and ground supplies?

No, the AD1674BR cannot operate with only +5 V and ground. It requires three independent supplies: +5 V (VLOGIC, Pin 1), +12 V or +15 V (VCC, Pin 7), and –12 V or –15 V (VEE, Pin 11). These dual analog rails are necessary to support its ±10 V bipolar input range, internal 10 V reference, and SHA front-end. Attempting single-supply operation will result in failure to acquire or convert correctly, and may damage the device per Absolute Maximum Ratings.

How does the AD1674BR handle 8-bit versus 12-bit data output formats?

The AD1674BR supports both 8-bit and 12-bit output via pin-controlled configuration: A0 selects conversion length (LOW = 12-bit, HIGH = 8-bit), while 12/8 determines data organization (HIGH = single 12-bit word on DB0–DB11; LOW = two 8-bit nibbles). In nibble mode, A0 enables either DB4–DB11 (MSB) or DB0–DB3 (LSB, padded with zeros). This allows direct interfacing to 8-bit microprocessors without external latches or buffers-fully documented in Table I and Figures 1–4 of the AD1674BR datasheet.

Is the AD1674BR pin-compatible with the AD574A?

Yes, the AD1674BR is fully pin-compatible with the AD574A and AD674A in the same 28-lead SOIC (R-28) or DIP package. All signal, power, and ground pins occupy identical positions-including VLOGIC, CE, CS, R/C, A0, 12/8, STS, DB0–DB11, REF OUT, REF IN, BIP OFF, 10 VIN, 20 VIN, AGND, DGND, VCC, and VEE. This enables direct mechanical and electrical replacement in legacy systems, with added benefit of integrated SHA and faster conversion-confirmed in the Product Description and Pin Configuration sections of the AD1674BR datasheet.