AD7172-2BRUZ-RL7: 24-Bit Sigma-Delta ADC for Precision Measurement

Quick Answers: What Is the AD7172-2BRUZ-RL7 and Why Does It Matter?

The AD7172-2BRUZ-RL7 is a 24-bit, low-noise, low-power multiplexed sigma-delta ADC from Analog Devices, designed for high-precision measurement applications. It features two fully differential or four single-ended input channels, integrated true rail-to-rail input buffers, and a maximum output data rate of 31.25 kSPS. The device operates from a 3V to 5.5V supply and communicates via SPI. It is housed in a 24-lead TSSOP package and is currently in active lifecycle status with 99,999 units in stock at XAIPART, priced at $10.6591 per unit at quantity 1000+ (as of 2026-08-23).

Engineers choose this ADC for its combination of high resolution, low power, and flexible input configuration, making it ideal for industrial process control, temperature measurement, weigh scales, precision instrumentation, medical monitoring, and data acquisition systems.

Technical Guide: How to Select, Design In, and Use the AD7172-2BRUZ-RL7

Key Specifications and Features

Before designing with the AD7172-2BRUZ-RL7, review its verified specifications:

• Resolution: 24 bit
• Channels: 2 differential / 4 single-ended
• Max Output Data Rate: 31.25 kSPS
• Input Type: Differential / Single-ended
• Interface: SPI
• Supply Voltage: 3 V to 5.5 V
• Operating Temperature: -40°C to +105°C
• Package: TSSOP-24
• Internal Reference: 2 ppm/°C
• Internal Oscillator: Yes
• Input Buffers: True rail-to-rail
• Programmable Gain: 1 to 128
• RoHS Compliant
• MSL Level: 3 (168 hours)

Selecting the Right Configuration

Choose between differential and single-ended inputs based on your sensor type. For bridge sensors like load cells, differential inputs with PGA gain up to 128 allow direct connection without external amplification. For thermocouples or RTDs, the PGA and internal reference simplify signal conditioning.

Power Supply and Reference Design

Provide a clean, low-noise supply within 3V to 5.5V. Use separate analog and digital ground planes to minimize noise. For the reference, the datasheet recommends low-noise references such as ADR445, ADR444, or ADR441 [VERIFY_NEEDED: specific reference recommendations from datasheet]. The internal 2 ppm/°C reference is suitable for many applications, but an external reference may improve temperature stability.

SPI Communication Setup

Connect the SPI lines: SCLK (pin 11), DIN (pin 12), DOUT/RDY (pin 13), and CS (pin 14). The interface supports 4-wire and 3-wire modes. Configure the device via SPI registers for input channel selection, gain, filter, and conversion mode. Use the SYNC pin (pin 15) for synchronization in multi-device systems.

PCB Layout Best Practices

Place decoupling capacitors close to AVDD and DVDD pins. Keep analog traces short and shielded from digital noise. Use a solid ground plane and avoid routing digital signals under the analog input area.

Calibration and Testing

Perform system calibration using known reference voltages. The device's high resolution requires careful attention to noise; use averaging or digital filtering in firmware if needed.

Alternatives & Comparison: Drop-In Replacements and Pin-Compatible Options

When sourcing the AD7172-2BRUZ-RL7, consider these alternatives from the verified data:

Summary: For a drop-in replacement with identical specs, choose AD7172-2BRUZ (tube) or AD7172-2BRUZ-RL (tape and reel). For higher speed, AD7175-2BRUZ-RL7 is pin-compatible but offers 250 kSPS. The ADS1256IDB is not pin-compatible and requires a PCB change.

Industry Insight: Market Position, Lifecycle, and Supply Situation

The AD7172-2BRUZ-RL7 is an active product from Analog Devices, indicating ongoing production and support. As of 2026-08-23, XAIPART holds 99,999 units in stock, ensuring immediate availability. Pricing tiers start at $18.2727 for single units and drop to $10.6591 at 1000+ quantities. The device is RoHS compliant and has an MSL of 3, meaning it requires baking if exposed to moisture for more than 168 hours.

Market demand for precision ADCs remains strong in industrial and medical applications. The AD7172-2's balance of resolution, power, and cost positions it well against competitors. [DATA_NEEDED: Market share data]

Trends & Outlook: What Buyers Should Watch

As industrial IoT and portable medical devices grow, demand for low-power, high-resolution ADCs like the AD7172-2BRUZ-RL7 will increase. The 24-bit resolution and 31.25 kSPS data rate meet the needs of precision sensing applications. Buyers should monitor supply chain stability, as Analog Devices continues to support this active part. The availability of pin-compatible upgrades (AD7175-2) provides a path for future performance enhancements without redesign.

For cost-sensitive designs, consider the tube packaging (AD7172-2BRUZ) for lower volume, or the tape-and-reel variants for automated assembly. Always verify current pricing and stock at XAIPART for the best procurement strategy.