Analog Devices Inc. AD1674KNZ

Overview

AD1674KNZ 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 three-state parallel digital interface. 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 logic supplies, and delivers ±1/2 LSB integral nonlinearity at 0°C to +70°C - used in precision data acquisition systems for industrial process control and automated test equipment.

For engineers reviewing the AD1674KNZ datasheet, AD1674KNZ pinout, AD1674KNZ application, or AD1674KNZ equivalent, this page provides verified technical context, exact pin functions, real-world use scenarios, and two validated alternative parts with documented functional and application-level differences - all grounded in Analog Devices' official AD1674 Rev. C datasheet and ordering guide.

Technical Context

The AD1674KNZ implements a successive approximation register (SAR) architecture with an integrated SHA that supports full Nyquist bandwidth operation up to 1 MHz, enabling accurate digitization of dynamic signals without external hold circuitry. Its internal 12-bit DAC, laser-trimmed scaling resistors, and comparator-based conversion core deliver guaranteed no-missing-codes performance across all 4096 codes.

Digital interface flexibility is achieved via dual-mode output buffering: 12/8 and A0 pins configure either single 12-bit word or two 8-bit nibbles, while CE, CS, and R/C enable full-control or stand-alone timing modes. AC specifications - including 70 dB S/(N+D), –90 dB THD, and 500 kHz full-linear bandwidth - are fully tested and guaranteed over temperature.

Key Specifications

Pinout & Package

AD1674KNZ is housed in a 28-lead plastic DIP (N-28 package), with 0.6-inch body width and standard through-hole mounting. Pin spacing follows industry-standard 0.1-inch grid; pin 1 marked by notch or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD1674KNZ, AD7892BRZ-1 reduces supply count and interface lines but sacrifices input flexibility and adds external reference dependency; ADS7800U matches analog supply and reference specs but introduces timing uncertainty and higher system-level validation effort due to missing integrated SHA.

Availability

AD1674KNZ is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, medical instrumentation data acquisition, and energy metering front-end applications requiring stable component supply, long-term obsolescence management, and traceable sourcing from authorized channels.

Supply support for AD1674KNZ 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, with design centers and manufacturing facilities worldwide.

The AD1674 product line was designed as a pin-compatible, performance-enhanced successor to the AD574A/AD674A, integrating sample-and-hold functionality and guaranteed AC/DC specifications for precision data acquisition in industrial and instrumentation systems.

FAQ

What is the maximum guaranteed integral nonlinearity (INL) for AD1674KNZ over its full operating temperature range?

The AD1674KNZ has a maximum guaranteed integral nonlinearity of ±1/2 LSB over its specified 0°C to +70°C operating temperature range, as confirmed in the AD1674 Rev. C datasheet DC specifications table for the K-grade device. This value is tested and guaranteed - not typical - and applies to both unipolar and bipolar input configurations when operated within rated supply voltages and input ranges. The AD1674KNZ achieves this performance using laser-trimmed on-chip resistors and BiMOS II process technology.

Does AD1674KNZ include an internal sample-and-hold amplifier, and how does it affect system design?

Yes, the AD1674KNZ integrates a transparent sample-and-hold amplifier (SHA) that supports full Nyquist bandwidth operation up to 1 MHz. This eliminates the need for external SHA circuitry, reduces component count, and removes acquisition timing uncertainty - allowing direct connection of anti-aliasing filters to the analog input pins. The SHA's 1 µs acquisition time and <250 ps aperture jitter are fully characterized and guaranteed, making AD1674KNZ suitable for dynamic signal capture without additional design validation.

Can AD1674KNZ operate with only a +5 V supply, or are dual analog supplies mandatory?

AD1674KNZ requires three separate supplies: +5 V (VLOGIC), and dual analog rails - typically ±12 V or ±15 V (VCC and VEE). It cannot operate with only +5 V. The ±12 V/±15 V supplies power the internal SHA, DAC, and comparator circuitry necessary for bipolar input operation and 12-bit linearity. Attempting operation with insufficient analog supply voltage will cause conversion failure, increased INL, or latch-up. The AD1674KNZ datasheet specifies absolute maximum ratings and operating ranges explicitly for all three supplies.

How does the 12/8 pin function in AD1674KNZ, and what impact does it have on microprocessor interfacing?

The 12/8 pin on AD1674KNZ selects the digital output organization: when HIGH, it enables 12-bit parallel output on DB0–DB11; when LOW, it configures the device for two 8-bit nibble reads. In the latter mode, A0 selects whether DB0–DB7 (A0 = LOW) or DB4–DB11 (A0 = HIGH) are driven - enabling seamless interface to 8-bit data buses without external latches or multiplexers. This dual-mode flexibility is intrinsic to AD1674KNZ's architecture and is fully supported in both full-control and stand-alone timing modes.

Is AD1674KNZ pin-compatible with AD574A, and what are the key functional improvements?

Yes, AD1674KNZ is pin-compatible with AD574A and AD674A, sharing identical 28-pin DIP pinout and control signal definitions (CE, CS, R/C, A0, 12/8). Key functional improvements include integrated sample-and-hold (eliminating external SHA), faster 10 µs 12-bit conversion time (vs. 25 µs for AD574A), guaranteed AC specifications (70 dB S/(N+D), –90 dB THD), and improved INL (±1/2 LSB vs. ±1 LSB for AD574A). These enhancements make AD1674KNZ a drop-in upgrade for legacy AD574A-based systems requiring higher throughput and dynamic performance.