Analog Devices Inc. AD7176-2BRUZ-RL

Overview

AD7176-2BRUZ-RL from Analog Devices is a 24-bit, sigma-delta analog-to-digital converter (ADC) with 20 µs settling time, 250 kSPS maximum output data rate, ±2.5 ppm INL, and integrated 2.5 V reference (2 ppm/°C drift). It supports two fully differential or four pseudo-differential inputs via crosspoint multiplexer and operates across −40°C to +105°C for industrial process control and multichannel instrumentation.

For engineers reviewing the AD7176-2BRUZ-RL datasheet, AD7176-2BRUZ-RL pinout, AD7176-2BRUZ-RL application, or AD7176-2BRUZ-RL equivalent, key selection criteria include noise-free resolution (17–22 bits), 50/60 Hz rejection capability, per-channel calibration support, and TSSOP-24 package compatibility with SPI/QSPI/MICROWIRE interfaces.

Technical Context

The AD7176-2BRUZ-RL implements a multiplexed sigma-delta architecture with three configurable digital filters: sinc5+sinc1 for fast channel scanning (50 kSPS/channel), sinc3 for high-resolution single-channel operation, and enhanced 50/60 Hz rejection filter enabling simultaneous line-frequency rejection at 27 SPS. Its internal 16 MHz oscillator, external crystal (14–16.384 MHz), or external clock input provides flexible timing control.

On-chip functions include per-channel offset/gain calibration, GPIO-controlled external multiplexer synchronization, and dual LDOs (AVDD2 and IOVDD supplies independent of AVDD1). The buffered 2.5 V reference delivers ±2 ppm/°C drift over −40°C to +105°C and supports up to ±10 mA load current.

Key Specifications

Pinout & Package

The AD7176-2BRUZ-RL is housed in a 24-lead TSSOP package (4.4 mm × 7.8 mm, 0.65 mm pitch) with exposed pad for thermal management. Pin assignments are validated per Analog Devices Rev. D datasheet Figure 4 and Table 5.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7176-2BRUZ-RL, AD7175-2BRUZ trades scan speed and advanced filtering for lower power, while ADS127L01IPBSR offers higher throughput at the cost of increased design complexity and external component dependency.

Availability

AD7176-2BRUZ-RL is available at Aetrix Electronics and suitable for process control modules, temperature measurement systems, and scientific instrumentation requiring stable component supply, long-term calibration integrity, and industrial temperature range operation.

Supply support for AD7176-2BRUZ-RL 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 AD7176-2BRUZ-RL belongs to Analog Devices' precision sigma-delta ADC product line, designed specifically for high-accuracy, multichannel industrial and scientific data acquisition where noise, line-frequency interference, and thermal drift must be minimized.

FAQ

What is the maximum channel scan rate supported by the AD7176-2BRUZ-RL?

The AD7176-2BRUZ-RL supports a maximum channel scan data rate of 50 kSPS per channel, achieved with its 20 µs settling time and sinc5 + sinc1 digital filter. This allows fully settled 17.3 noise-free bit data across all configured inputs without inter-channel crosstalk or settling errors. The device maintains this performance across its full −40°C to +105°C operating range, making it suitable for high-throughput industrial data loggers and PLC modules where deterministic timing is critical. The AD7176-2BRUZ-RL's crosspoint multiplexer and automatic GPIO control further streamline multichannel system design.

Does the AD7176-2BRUZ-RL include an integrated voltage reference?

Yes, the AD7176-2BRUZ-RL integrates a precision 2.5 V band gap reference with 2 ppm/°C maximum drift over 0°C to +105°C and 4.5 µV rms noise (0.1–10 Hz). The buffered REFOUT pin delivers up to ±10 mA and is factory trimmed for initial accuracy within ±0.16% at 25°C. This eliminates the need for external reference ICs in most applications, reducing BOM count and PCB area. The AD7176-2BRUZ-RL also accepts external references (1 V to AVDD1) via REF+ and REF−, providing flexibility for systems requiring higher reference voltage or ultra-low-noise external sources.

How does the AD7176-2BRUZ-RL handle 50 Hz and 60 Hz interference?

The AD7176-2BRUZ-RL features a dedicated enhanced digital filter that achieves simultaneous 50 Hz and 60 Hz rejection at 27 SPS with 36 ms settling time, delivering >130 dB rejection at each frequency. Unlike standard sinc3 filters, this mode is optimized for global deployments where both line frequencies may be present. At 20 SPS, the AD7176-2BRUZ-RL achieves 130 dB rejection using its internal clock. The device also supports external clock inputs for tighter timing control in noise-sensitive environments. These capabilities are verified across temperature and supply variations, ensuring robust performance in industrial plants and laboratories without external notch filters.

What serial interface protocols does the AD7176-2BRUZ-RL support?

The AD7176-2BRUZ-RL supports 3- or 4-wire SPI-compatible serial communication with Schmitt-triggered SCLK for noise immunity, and is interoperable with QSPI, MICROWIRE, and DSP interfaces. It uses standard SPI framing (CS active-low, MSB-first, SCLK rising-edge sample/falling-edge setup) and includes CRC error checking for data integrity. The DOUT/RDY pin serves dual function: serial data output during read cycles and conversion-ready interrupt when CS is low. The AD7176-2BRUZ-RL does not require external level shifters for 2–5.5 V IOVDD operation, simplifying interface to diverse host processors including ARM Cortex-M and RISC-V microcontrollers.

Can the AD7176-2BRUZ-RL perform per-channel calibration?

Yes, the AD7176-2BRUZ-RL supports independent system offset and gain calibration for each of its up to four input channels. Calibration coefficients are stored in dedicated offset and gain registers (Offset Register 0–3, Gain Register 0–3), allowing dynamic correction without host processor intervention. This capability eliminates channel-to-channel mismatch in multiplexed systems and compensates for sensor-specific drift or amplifier nonlinearity. The AD7176-2BRUZ-RL applies corrections automatically during conversion, ensuring calibrated data appears directly in the output register. Per-channel ODR configuration is also supported when using the sinc5 + sinc1 filter, enhancing flexibility in heterogeneous sensor arrays.