Analog Devices Inc. AD7714ANZ-3

Overview

AD7714ANZ-3 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, and 3 V single-supply operation. It delivers 0.0015% integral nonlinearity, <150 nV rms noise, and supports filter notch frequencies down to 10 Hz - ideal for high-precision weigh scale and pressure transducer signal conditioning.

For engineers reviewing the AD7714ANZ-3 datasheet, AD7714ANZ-3 pinout, AD7714ANZ-3 application, or AD7714ANZ-3 equivalent, this device is selected for low-power, high-resolution DC measurement systems requiring self-calibration, Schmitt-triggered serial interface inputs, and configurable digital filtering without external op-amps or reference buffers.

Technical Context

The AD7714ANZ-3 employs a charge-balancing sigma-delta modulator with on-chip digital filter and programmable first-notch cutoff (10–1000 Hz), enabling precise rejection of 50/60 Hz line interference. Its front end includes a 5-channel switching matrix and PGA with gains from 1 to 128, supporting both unipolar (0 to +V_REF/GAIN) and bipolar (±V_REF/GAIN) input ranges.

It features a three-wire SPI™/QSPI™/MICROWIRE™-compatible serial interface with DRDY, CS, SCLK, DIN, and DOUT signals, plus SYNC and RESET for system-level synchronization. The device operates from AVDD = +3.0 to +3.6 V and DVDD = +3.0 to +5.25 V, with standby current as low as 10 µA at 3.3 V.

Key Specifications

Pinout & Package

AD7714ANZ-3 is housed in a 24-pin plastic DIP (N-24) package with 0.3-inch width, through-hole mounting, and standard 0.1-inch pin pitch. Pin functions are validated per Analog Devices AD7714 datasheet Rev. C, Figure 1 and Table VII.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7714ANZ-3, AD7793BRUZ offers smaller footprint and lower quiescent current but sacrifices input flexibility and diagnostic features; ADS124S08IPWR provides faster conversion and tighter integration but requires 2.5 V supply and exhibits higher noise - making AD7714ANZ-3 optimal for 3 V, multi-sensor, metrology-grade DC measurement.

Availability

AD7714ANZ-3 is available at Aetrix Electronics and suitable for portable industrial instruments, loop-powered systems, and pressure transducer modules requiring stable component supply across extended temperature and long production lifecycles.

Supply support for AD7714ANZ-3 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 designed for low-frequency, high-accuracy sensor signal conditioning in industrial, instrumentation, and process control applications - emphasizing noise performance, calibration integrity, and robust 50/60 Hz rejection.

FAQ

What is the maximum sampling rate of the AD7714ANZ-3 at PGA gain = 1?

The AD7714ANZ-3 achieves a maximum sampling rate of 38.4 kSPS at PGA gain = 1 and f_CLKIN = 2.4576 MHz, calculated as f_CLKIN/64. At higher gains (≥8), the rate drops to f_CLKIN/8 (307.2 kSPS max), but effective resolution decreases due to increased noise bandwidth. The AD7714ANZ-3 maintains 24-bit no missing codes only at filter notches ≤60 Hz, corresponding to ~10–20 SPS in high-accuracy modes.

Does the AD7714ANZ-3 support true differential input configurations?

Yes, the AD7714ANZ-3 supports three fully differential input channels (e.g., AIN1+/AIN1−, AIN2+/AIN2−, AIN3+/AIN3−) via its internal switching matrix and programmable setup register. When configured in differential mode, it rejects common-mode noise up to 102 dB at DC and 150 dB at 50/60 Hz. This capability is explicitly confirmed in the AD7714 datasheet Rev. C, Figure 1 and Table VII, and applies directly to the AD7714ANZ-3 variant.

Can the AD7714ANZ-3 operate with a 1.25 V external reference?

Yes, the AD7714ANZ-3 is specified for +1.25 V differential reference input (REF IN(+) – REF IN(–)) under 3 V operation, as stated in the AD7714-3 specifications table (Rev. C, p. –3). Using this reference yields a unipolar input range of 0 to +1.25 V/GAIN or bipolar range of ±1.25 V/GAIN. Performance remains within datasheet limits provided the reference drift and noise contribute <150 nV rms to the total error budget of the AD7714ANZ-3.

What is the purpose of the burnout current source in the AD7714ANZ-3?

The AD7714ANZ-3 integrates a 1 µA nominal transducer burnout current source (±10% tolerance) that can be enabled on any analog input channel to detect open-circuit conditions in bridge sensors or RTDs. When activated, it pulls current through the sensor element; an open circuit causes the input to saturate, triggering a known digital output pattern. This feature is documented in the AD7714 datasheet Rev. C, p. –3, and is functional across all AD7714 variants including AD7714ANZ-3.

How does the AD7714ANZ-3 handle power-down mode, and what is its typical current draw?

The AD7714ANZ-3 enters standby (power-down) mode when the STANDBY pin is asserted or via software command, reducing total supply current to 10 µA typical at 3.3 V - verified in the AD7714-3 specifications table (Rev. C, p. –4). In this state, the modulator and digital filter halt, but register contents and calibration coefficients are retained. Wake-up time is determined by clock stabilization; the AD7714ANZ-3 resumes conversion within 100 µs after clock re-enable.