AD7172-2BRUZ-RL7 - 24-Bit Sigma-Delta ADC, 31.25kSPS | Analog Devices
MPN: AD7172-2BRUZ-RL7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.06 | $9.06 |
| 10 | $8.75 | $87.50 |
| 100 | $8.25 | $825.00 |
| 500 | $7.85 | $3,925.00 |
| 1,000 | $7.5 | $7,500.00 |
| 3,000 | $7.1 | $21,300.00 |
AD7172-2BRUZ-RL7 Overview
An ADC converts continuous analog signals into discrete digital values for processing by digital systems. The AD7172-2 is a sigma-delta ADC, which uses oversampling and noise shaping to achieve high resolution and excellent noise performance. It belongs to the family of precision data converters, which are essential for accurately measuring physical quantities such as temperature, pressure, and strain. The AD7172-2 integrates key analog and digital signal conditioning blocks, allowing users to configure each analog input channel individually via the SPI interface.
Key features include 24-bit resolution, 31.25 kSPS maximum output data rate, and integrated true rail-to-rail buffers on both analog and reference inputs. The device offers a programmable gain amplifier (PGA) with gains of 1, 2, 4, 8, 16, 32, 64, and 128, allowing direct connection to low-level sensor outputs. It also includes a 2 ppm/°C internal reference, an internal oscillator, and a built-in temperature sensor. The ADC supports both differential and single-ended input configurations, providing flexibility for various sensor interfaces.
The sigma-delta modulator and digital filter achieve high accuracy and linearity while maintaining low power consumption. The SPI interface supports 4-wire and 3-wire modes, and the device can be configured for continuous or single conversion. Integrated buffers simplify driving high-impedance inputs, reducing external component requirements. The reel packaging supports high-volume manufacturing.
Typical applications include industrial process control, temperature and pressure measurement, weigh scales, medical monitoring, battery-powered instrumentation, and general-purpose data acquisition. Its low power consumption and high resolution make it ideal for portable devices. For best accuracy, the datasheet recommends low-noise references such as ADR445, ADR444, or ADR441. Proper PCB layout with separate analog and digital ground planes is essential to achieve specified performance.
Drop-in alternatives for AD7172-2BRUZ-RL7 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AD7172-2BRUZ-RL7 (same form factor and footprint) — differing in Package, Input Type, Analog Supply Voltage, Digital Supply Voltage, Resolution.
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AD7172-2BRUZ
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View Datasheet →AD7172-2BRUZ-RL7 Maximum Ratings & Electrical Characteristics
| Resolution | 24 bit |
| Number of Input Channels | 2 differential or 4 single-ended |
| Maximum Output Data Rate | 31.25 kSPS |
| Output Data Rate Range | 1.25 Hz to 31.25 kHz |
| Input Type | Differential, Single-Ended |
| Interface | SPI (4-wire/3-wire) |
| Supply Voltage | 3V to 5.5V |
| PGA Gain Options | 1, 2, 4, 8, 16, 32, 64, 128 |
| Analog Input Buffers | True rail-to-rail |
| Reference Input Buffers | True rail-to-rail |
| Internal Reference Drift | 2 ppm/°C |
| Internal Temperature Sensor | Yes |
| Internal Oscillator | Yes |
| Operating Temperature Range | -40°C to +105°C |
| Package | 24-lead TSSOP |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
AD7172-2BRUZ-RL7 24-lead tssop Pin Configuration Guide
Pin configuration for AD7172-2BRUZ-RL7 (24-lead tssop package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for AD7172-2BRUZ-RL7.
Refer to the datasheet for full pin configuration.
Typical Applications
AD7172-2BRUZ-RL7 is suitable for 6 applications: Industrial Process Control, Temperature Measurement (RTD/Thermocouple), Weigh Scale / Strain Gauge, Battery-Powered Portable Instrumentation, Medical Monitoring, Data Acquisition / Laboratory Instrumentation.
Industrial Process Control
The AD7172-2BRUZ-RL7 fits industrial process control loops by digitizing 4-20 mA shunt, pressure, and level signals with 24-bit resolution. Its integrated true rail-to-rail input buffers allow direct connection to high-impedance sensor bridges, while the SPI interface simplifies reading data in a PLC or transmitter. The 31.25 kSPS data rate is adequate for control-loop updates, and the 3V–5.5V supply range matches common 3.3V/5V microcontrollers. Use a low-drift reference such as AD780ARZ or ADR444 to maintain accuracy over temperature.
Recommended
Temperature Measurement (RTD/Thermocouple)
For RTD and thermocouple inputs, AD7172-2BRUZ-RL7's PGA provides gains up to 128 so millivolt-level sensor outputs can be measured without an external amplifier. The internal 2 ppm/°C reference and temperature sensor help calibrate cold-junction errors. Low noise and digital filter rejection improve measurement stability. The integrated buffers reduce input bias current errors when switching multiplexed channels. Pair it with ADR445 or AD780ARZ for a low-drift reference and ADA4522-2ARZ for front-end filtering.
Recommended
Weigh Scale / Strain Gauge
The AD7172-2BRUZ-RL7 is suited for weigh-scale and strain-gauge bridges because its 24-bit resolution and PGA allow direct bridge output digitization with negligible quantization error. True rail-to-rail buffers simplify bridge excitation and signal routing. The device's low power supports battery-powered scales, while the SPI interface enables fast calibration updates. For a load-cell bridge, use a precision 5V reference such as AD780ARZ and place the ADC close to the bridge to minimize noise. The integrated temperature sensor can assist with drift compensation.
Recommended
Battery-Powered Portable Instrumentation
The low-power architecture of AD7172-2BRUZ-RL7 makes it attractive for portable data loggers and analytical instruments. Operating from 3V–5.5V and offering programmable data rates down to 1.25 Hz allows the system to trade speed for lower average current. The integrated reference, oscillator, and buffers reduce external component count and BOM cost. Use a low-power reference like REF192ESZ for battery-powered precision measurements. The TSSOP-24 package occupies minimal board area while simplifying rework.
Recommended
Medical Monitoring
In medical monitoring equipment such as patient vital-sign front ends and diagnostic analyzers, the AD7172-2BRUZ-RL7 provides high-resolution, repeatable measurements. Its 24-bit sigma-delta conversion and integrated buffers minimize external analog conditioning, while the SPI interface isolates digital noise from sensor inputs. The 31.25 kSPS rate supports fast multiplexed scans of temperature, pressure, and bio-signals. Designers should use a low-noise, low-drift reference like ADR444 and follow recommended PCB grounding to meet EMC requirements.
Recommended
Data Acquisition / Laboratory Instrumentation
For general-purpose data acquisition, AD7172-2BRUZ-RL7 offers software-configurable two differential or four single-ended channels, making it a flexible front end for logging multiple analog signals. The SPI port supports 3-wire and 4-wire modes for connection to CPUs, FPGAs, and MCUs. The internal oscillator and rail-to-rail buffers reduce design effort, and the 24-bit resolution captures small signal variations in sensor and power-monitoring experiments. An external precision reference like AD780ARZ can improve absolute accuracy. Ensure clean power and short SPI traces for best performance.
Recommended
Recommended Products Summary
Engineering reference data for AD7172-2BRUZ-RL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7172-2BRUZ | AD7177-2BRUZ | AD7175-2BRUZ | AD7176-2BRUZ |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 24-lead TSSOP (BRUZ) | 24-lead TSSOP (BRUZ) - same | 24-lead TSSOP (BRUZ) - same | 24-lead TSSOP (BRUZ) - same | 24-lead TSSOP (BRUZ) - same |
| Resolution | 24-bit | 24-bit | 24-bit | 24-bit | 24-bit |
| Max Output Data Rate | 31.25 kSPS | 31.25 kSPS | 32 kSPS | 250 kSPS | 250 kSPS |
| Input Channels | 2 differential or 4 single-ended | 2 differential or 4 single-ended | 2 differential or 4 single-ended | 2 differential or 4 single-ended | 2 differential or 4 single-ended |
| Supply Voltage | 3V to 5.5V | 3V to 5.5V | 3V to 5.5V | 3V to 5.5V | 3V to 5.5V |
| Interface | SPI (4-wire/3-wire) | SPI (4-wire/3-wire) | SPI (4-wire/3-wire) | SPI (4-wire/3-wire) | SPI (4-wire/3-wire) |
Key Differentiators
- Integrated true rail-to-rail input and reference buffers (vs AD7176-2BRUZ)
- Internal 2 ppm/°C reference plus temperature sensor (vs AD7177-2BRUZ)
- Moderate-speed low-power architecture (vs AD7175-2BRUZ)
Design Notes
Decouple AVDD, IOVDD, and reference pins with low-ESR ceramic capacitors (0.1 uF and 10 uF) placed as close to the pins as possible. The AD7172-2 operates from 3V to 5.5V; a low-noise LDO on the analog supply reduces sigma-delta noise. Avoid sharing analog and digital supply traces. Refer to the AD7172-2 datasheet typical application circuit for recommended capacitor values.
Use separate analog and digital ground planes with a single-point connection under the ADC. Route SPI signals away from analog input and reference traces to prevent digital coupling. A ground guard ring around AIN and REF inputs reduces leakage. Keep the thermal pad (if used) connected to analog ground with multiple vias for stable temperature performance.
Do not leave the analog input pins floating; unused inputs should be tied to a valid common-mode voltage. The reference input requires a low-impedance, low-noise source; Analog Devices recommends ADR445, ADR444, or ADR441. Ensure REF+ is always greater than REF-. Program the digital filter correctly for the desired data rate to avoid alias rejection issues.
Compliance Information
JLCPCB listing indicates RoHS compliance. REACH, halogen-free, and conflict minerals data not explicitly provided in the verified web data.
