Analog Devices Inc. AD7715ARZ-5REEL

Overview

AD7715ARZ-5REEL from Analog Devices is a 16-bit sigma-delta analog-to-digital converter (ADC) with programmable gain front end (gains of 1, 2, 32, 128), differential input capability, and three-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP controllers. It operates at 5 V supply, consumes ≤450 µA total current, and delivers 16-bit no-missing-codes performance for precision low-frequency transducer signal acquisition in industrial sensor interfaces.

For engineers reviewing the AD7715ARZ-5REEL datasheet, AD7715ARZ-5REEL pinout, AD7715ARZ-5REEL application, or AD7715ARZ-5REEL equivalent, key selection criteria include its 5 V operation mode, ±0.0015% integral nonlinearity, 98 dB 50/60 Hz normal-mode rejection, buffered/unbuffered analog input configuration, and software-configurable output update rate via digital filter notch programming.

Technical Context

The AD7715ARZ-5REEL implements a charge-balancing sigma-delta architecture with on-chip digital filtering, where the first notch frequency determines both output update rate and line-frequency rejection. Its analog front end includes a programmable-gain amplifier (PGA) and optional input buffer, enabling direct connection to low-level transducers without external signal conditioning.

It features dual-supply operation (AVDD = 4.75–5.25 V, DVDD = 3–5.25 V), differential reference inputs (REF IN(+) − REF IN(−) = 2.5 V nominal), and supports unipolar (0 mV to 2.5 V) and bipolar (±2.5 V) input ranges at gain 1. Calibration registers support self- and system-calibration to eliminate offset and full-scale errors.

Key Specifications

Pinout & Package

AD7715ARZ-5REEL is housed in a 16-lead SOIC_W (0.3 inch wide) package with exposed pad not electrically connected. Pin functions are defined per Analog Devices Rev. E datasheet Figure 3 and Table 6.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7714BRUZ and ADS1248IPWR, AD7715ARZ-5REEL uniquely combines 5 V-native operation, selectable ×2/×32 gain steps, on-chip 2.5 V reference support, and user-programmable digital filter notch-making it optimal for cost-sensitive, noise-prone 5 V industrial sensor nodes requiring 16-bit integrity without external components.

Availability

AD7715ARZ-5REEL is available at Aetrix Electronics and suitable for pressure measurement, temperature monitoring, smart transmitter design, and industrial data acquisition requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for AD7715ARZ-5REEL 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 Norwood, MA.

The AD7715 belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for low-frequency, high-accuracy industrial measurement applications where transducer-level signals must be digitized with minimal external circuitry.

FAQ

What is the maximum master clock frequency supported by AD7715ARZ-5REEL?

The AD7715ARZ-5REEL supports master clock frequencies from 400 kHz to 2.5 MHz. It is production-tested at 2.4576 MHz and guaranteed by characterization down to 400 kHz. Operation above 2.5 MHz may cause timing violations or increased current draw, and is not recommended per Rev. E datasheet specifications.

Does AD7715ARZ-5REEL require an external reference voltage?

No - AD7715ARZ-5REEL is designed for use with a 2.5 V external reference (REF IN(+) − REF IN(−) = 2.5 V), but it does not integrate a reference. The device accepts this reference differentially and uses it to define full-scale range; no internal reference is present, so an external precision 2.5 V source (e.g., ADR421) is required for specified performance.

Can AD7715ARZ-5REEL operate with AVDD = 5 V and DVDD = 3.3 V simultaneously?

Yes - AD7715ARZ-5REEL supports independent analog and digital supplies: AVDD = 4.75–5.25 V and DVDD = 3–5.25 V. Using AVDD = 5 V and DVDD = 3.3 V is explicitly permitted and commonly implemented to reduce digital switching noise coupling into the analog section while maintaining logic compatibility with 3.3 V microcontrollers.

How does the buffer mode affect input impedance and measurement accuracy in AD7715ARZ-5REEL?

When the BUF bit in the setup register is set, AD7715ARZ-5REEL enables an internal input buffer that raises differential input impedance to >1 GΩ and eliminates bias current errors - critical for high-impedance sensors like thermistors. However, buffer activation increases AVDD current by ~0.3 mA and slightly reduces effective resolution due to added noise; it should be enabled only when source impedance exceeds 10 kΩ.

What calibration modes are available in AD7715ARZ-5REEL and how are they initiated?

AD7715ARZ-5REEL supports self-calibration (zero- and full-scale) and system calibration (zero- and full-scale). These are initiated by writing specific values to the communications register (RS1, RS0 = 0,0) followed by a write to the setup register. Self-calibration corrects internal offsets/gains; system calibration corrects errors introduced by external circuitry such as sensor excitation and signal conditioning stages.