Analog Devices Inc. AD7715ARUZ-3

Overview

AD7715ARUZ-3 from Analog Devices is a 16-bit sigma-delta analog-to-digital converter optimized for low-frequency, high-precision measurement of transducer signals. It features a programmable gain amplifier (gains 1/2/32/128), differential analog and reference inputs, 3 V single-supply operation, and 450 µA max supply current at 1 MHz master clock. It delivers 16-bit no-missing-codes performance with ±0.0015% integral nonlinearity and supports unipolar/bipolar input ranges including ±20 mV and ±1.25 V - ideal for strain gauge and RTD-based sensor front ends.

For engineers reviewing the AD7715ARUZ-3 datasheet, AD7715ARUZ-3 pinout, AD7715ARUZ-3 application, or AD7715ARUZ-3 equivalent, key selection considerations include its 3 V operation, integrated PGA eliminating external signal conditioning, three-wire SPI-compatible serial interface, on-chip self/system calibration, and 16-lead TSSOP package compatibility with space-constrained industrial sensing modules.

Technical Context

The AD7715ARUZ-3 employs a charge-balancing sigma-delta modulator followed by an on-chip digital filter with programmable first-notch frequency (20 Hz to 60 Hz), enabling precise rejection of 50/60 Hz line interference. Its analog front end includes a buffered or unbuffered differential input path and a fully differential reference input referenced to AGND.

Control is implemented via a register bank accessed through a three-wire serial interface (SCLK, DIN, DOUT, CS), supporting software-configurable gain, polarity, update rate, and calibration modes. The device operates with either an external CMOS clock or a crystal/resonator across MCLK IN/MCLK OUT, with internal clock generation logic ensuring stable timing for conversion and filtering.

Key Specifications

Pinout & Package

AD7715ARUZ-3 is housed in a 16-lead TSSOP package (RUZ suffix), 4.4 mm × 5.0 mm body, 0.65 mm pitch, lead-free and RoHS-compliant. Thermal impedance θ_JA = 128°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7714ARUZ and ADS124S08IPW, the AD7715ARUZ-3 offers the optimal balance of 16-bit precision, 3 V ultra-low-power operation, integrated reference scaling, and minimal external component count for cost-sensitive, single-sensor industrial measurement nodes.

Availability

AD7715ARUZ-3 is available at Aetrix Electronics and suitable for pressure transmitters, RTD temperature monitors, smart 4–20 mA transmitters, and load cell interfaces requiring stable component supply across extended production lifecycles.

Supply support for AD7715ARUZ-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, headquartered in Norwood, MA.

The AD7715 belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for low-frequency, high-resolution industrial and instrumentation applications where transducer signal integrity, power efficiency, and system-level calibration simplicity are critical.

FAQ

What is the maximum master clock frequency supported by the AD7715ARUZ-3?

The AD7715ARUZ-3 is specified for master clock frequencies from 400 kHz to 2.4576 MHz. Operation at 2.4576 MHz enables faster output update rates and is used in production testing; however, the device is guaranteed by characterization to function correctly across the full 400 kHz–2.4576 MHz range. At 1 MHz, the AD7715ARUZ-3 achieves its rated 450 µA max supply current and optimal noise performance.

Does the AD7715ARUZ-3 require an external reference voltage?

No, the AD7715ARUZ-3 does not require an external reference voltage - it uses a differential reference input (REF IN(+) and REF IN(–)) with a nominal 1.25 V difference. This 1.25 V reference must be supplied externally, but the AD7715ARUZ-3 itself contains no internal reference generator. The 1.25 V value is matched to the 3 V supply for optimal dynamic range and noise performance in the AD7715ARUZ-3 variant.

Can the AD7715ARUZ-3 interface directly with a 3.3 V microcontroller SPI port?

Yes, the AD7715ARUZ-3 is fully compatible with 3.3 V microcontrollers. Its digital I/O pins (SCLK, DIN, DOUT, CS, DRDY, RESET) operate at 3 V logic levels: input high threshold is 2.0 V (min), output high level is DVDD − 0.6 V (≥2.4 V at 3 V), and output low is 0.4 V (max). No level-shifting circuitry is needed when interfacing with standard 3.3 V SPI peripherals.

How does the AD7715ARUZ-3 handle 50 Hz and 60 Hz interference in industrial settings?

The AD7715ARUZ-3 provides 98 dB normal-mode and 150 dB common-mode rejection at both 50 Hz and 60 Hz through its programmable digital filter notch. By setting the first filter notch to 25 Hz or 20 Hz respectively, the device inherently suppresses power-line harmonics without external analog filtering. This capability is guaranteed in specification Tables 1 and 2 and validated across the full –40°C to +85°C temperature range.

Is the AD7715ARUZ-3 pin-compatible with other variants in the AD7715 family?

Yes, the AD7715ARUZ-3 shares identical pinout and footprint with the AD7715ARUZ-5 (5 V version) and AD7715BN (PDIP) variants. All use the same 16-lead TSSOP (RUZ), SOIC (R), or PDIP (N) packages and maintain identical pin functions, register maps, and serial interface protocols - enabling hardware reuse across 3 V and 5 V system designs with only supply and reference voltage adjustments required.