Analog Devices Inc. AD7714ANZ-5

Overview

AD7714ANZ-5 from Analog Devices is a 24-bit sigma-delta analog-to-digital converter (ADC) with integrated programmable-gain amplifier (PGA), five-channel pseudo-differential or three-channel fully differential input architecture, and 0.0015% integral nonlinearity. It operates from a +4.75 V to +5.25 V analog supply and supports 3-wire SPI™/QSPI™/MICROWIRE™ serial interface. Designed for precision low-frequency transducer signal conditioning, it delivers <150 nV rms input-referred noise and enables direct connection to strain gauges and pressure sensors in industrial weighing and loop-powered systems.

For engineers reviewing the AD7714ANZ-5 datasheet, AD7714ANZ-5 pinout, AD7714ANZ-5 application, or AD7714ANZ-5 equivalent, key selection considerations include its 24-bit no-missing-codes performance at ≤60 Hz filter notch, ±0.0015% INL, 5 V operation, 24-pin PDIP package, and support for self/system/background calibration - critical for portable instrumentation and high-stability sensor interfaces.

Technical Context

The AD7714ANZ-5 implements a charge-balancing sigma-delta architecture with on-chip digital filtering, where the first notch frequency is software-programmable to adjust cutoff and settling time. Its front end features a PGA with selectable gains of 1–128, configurable as either three fully differential inputs or five pseudo-differential inputs, plus a dedicated differential reference input.

It uses a single 5 V analog supply (AVDD = +4.75 V to +5.25 V) and supports digital supplies from +3 V to +5.25 V (DVDD). The device includes Schmitt-triggered logic inputs only in Y-grade variants; the AD7714ANZ-5 (A-grade) uses standard CMOS input thresholds and operates over –40°C to +85°C.

Key Specifications

Pinout & Package

The AD7714ANZ-5 is housed in a 24-pin plastic dual-in-line package (PDIP), 0.3 inch wide, with through-hole mounting. Pin functions are defined per the AD7714 datasheet Rev. C functional block diagram and pin configuration table.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision sigma-delta ADC applications.

Compared with AD7714ANZ-5, AD7718BRUZ offers greater channel density but omits burnout detection essential for field sensor diagnostics, while ADS1258IPWR trades ultra-low DC noise for higher speed and external reference dependency - making AD7714ANZ-5 uniquely balanced for low-power, high-accuracy, self-diagnosing industrial sensor interfaces.

Availability

AD7714ANZ-5 is available at Aetrix Electronics and suitable for portable industrial instruments, portable weigh scales, and loop-powered systems requiring stable component supply, long-term calibration integrity, and proven field reliability in harsh environments.

Supply support for AD7714ANZ-5 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, founded in 1965 and headquartered in Wilmington, MA.

The AD7714 product line was engineered for high-accuracy, low-frequency measurement applications - specifically targeting transducer-based systems where resolution, noise, drift, and integrated signal conditioning are critical design constraints.

FAQ

What is the maximum recommended master clock frequency for AD7714ANZ-5?

The AD7714ANZ-5 supports a master clock (MCLK IN) frequency up to 2.5 MHz for specified performance. Operation at 2.4576 MHz is typical in precision applications to align with standard crystal frequencies and optimize filter notch placement for 50/60 Hz rejection. Exceeding 2.5 MHz may degrade INL and noise performance per the datasheet timing specifications.

Does AD7714ANZ-5 support both unipolar and bipolar input ranges?

Yes, AD7714ANZ-5 supports both unipolar and bipolar input ranges via the B/U bit in the Filter High register. In unipolar mode (B/U = 1), the input range is 0 to +VREF/GAIN; in bipolar mode (B/U = 0), it is ±VREF/GAIN. This flexibility allows seamless adaptation to different sensor output types - such as 0–10 mV (unipolar) or ±10 mV (bipolar) strain gauge bridges - without external level-shifting circuitry.

How does the AD7714ANZ-5 handle reference voltage variations?

The AD7714ANZ-5 uses a ratiometric architecture where the analog input full-scale range is defined as VREF/GAIN. With a nominal 2.5 V reference (REF IN(+) – REF IN(–)), it maintains accuracy even with moderate reference drift because both input scaling and conversion reference track the same source. The device functions down to 2.475 V and up to 2.525 V reference for specified performance, ensuring robustness against reference tolerance and temperature drift.

Can AD7714ANZ-5 perform self-calibration without external components?

Yes, AD7714ANZ-5 supports full on-chip self-calibration that corrects for zero-scale and full-scale errors without any external components or user intervention. The process uses internal switches to short inputs and apply reference voltages, then writes corrected coefficients to calibration registers. This eliminates manual trimming and compensates for temperature-induced drift - a key advantage for sealed or inaccessible field-deployed instruments.

What is the purpose of the BUFFER bit in the AD7714ANZ-5 setup register?

The BUFFER bit controls whether the analog input buffer is enabled (BUFFER = 1) or bypassed (BUFFER = 0). When enabled, the buffer supports common-mode input voltages from AGND + 50 mV to AVDD – 1.5 V, improving CMR and allowing direct connection to high-impedance sources like thermocouples. When disabled, input voltage range narrows to AGND to AVDD but reduces power consumption by ~0.2 mA - useful in low-power, low-impedance sensor configurations.