AD7172-2BRUZ - 24-Bit Sigma-Delta ADC | Analog Devices
MPN： AD7172-2BRUZ ✓ 啟用中AD7172-2BRUZ 概覽
A sigma-delta ADC is a type of analog-to-digital converter that uses oversampling and noise shaping to achieve high resolution. It is ideal for precision measurement applications where low noise and high accuracy are required. The AD7172-2 belongs to the family of sigma-delta ADCs, which are widely used in industrial process control, medical instrumentation, and weigh scales.
Key features include 24-bit resolution, 31.25 kSPS output data rate, 2 fully differential or 4 single-ended input channels, true rail-to-rail buffers, and a programmable digital filter. The device also offers a 50 Hz/60 Hz rejection mode, offset and gain calibration, and a 2.5 V internal reference. The integrated buffers simplify the interface to high-impedance sensors.
The AD7172-2 uses a sigma-delta modulator with a digital filter that can be configured for various output data rates and settling times. The device includes a multiplexer that allows each analog input to be configured independently. The SPI interface supports read/write access to the configuration registers and conversion results.
Typical applications include temperature measurement, pressure sensing, weigh scales, and industrial process control. The low power consumption and high resolution make it suitable for battery-powered and portable instruments.
When designing with the AD7172-2, ensure that the reference input is properly decoupled and that the analog input signals are within the common-mode range. The device requires an external reference for best performance, such as the ADR445 or ADR444.
直接替換替代品，適用於 AD7172-2BRUZ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： AD7172-2BRUZ （相同外形與佔位） — 差異在於 Package, Number of Channels, Resolution, Input Type, Sampling Rate.
AD7175-2BRUZ
✅ 直接替換聯絡詢價
查看資料表 →AD7176-2BRUZ
✅ 直接替換聯絡詢價
查看資料表 →AD7177-2BRUZ
✅ 直接替換聯絡詢價
查看資料表 →AD7799BRUZ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →AD7798BRUZ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →AD7172-2BRUZ 最大額定值與電氣特性
| 解析度 | 24 Bit |
| Number of Channels | 2 Differential or 4 Single-Ended |
| Output Data Rate | 31.25 kSPS |
| Input Type | Differential, Single-Ended |
| 供應電壓 | 2.5 V to 5.5 V |
| 介面 | SPI |
| 封裝 | 24-Lead TSSOP |
| 工作溫度範圍 | -40°C to +105°C |
| Reference Type | External, Internal |
| Internal Reference | 2.5 V |
| True Rail-to-Rail Buffers | Yes |
| Digital Filter | Programmable |
| 50 Hz/60 Hz Rejection | Yes |
| Offset and Gain Calibration | Yes |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
AD7172-2BRUZ 腳位配置
| 腳位 1 | AVDD — Analog power supply |
| 腳位 2 | AIN0 — Analog input 0 |
| 腳位 3 | AIN1 — Analog input 1 |
| 腳位 4 | AIN2 — Analog input 2 |
| 腳位 5 | AIN3 — Analog input 3 |
| 腳位 6 | REF+ — Positive reference input |
| 腳位 7 | REF- — Negative reference input |
| 腳位 8 | AVSS — Analog ground |
| 腳位 9 | DVDD — Digital power supply |
| 腳位 10 | DGND — Digital ground |
| 腳位 11 | SCLK — Serial clock input |
| 腳位 12 | DIN — Serial data input |
| 腳位 13 | DOUT — Serial data output |
| 腳位 14 | CS — Chip select |
| 腳位 15 | SYNC — Synchronization input |
| 腳位 16 | RESET — Reset input |
| 腳位 17 | GPIO0 — General purpose I/O |
| 腳位 18 | GPIO1 — General purpose I/O |
| 腳位 19 | GPIO2 — General purpose I/O |
| 腳位 20 | GPIO3 — General purpose I/O |
| 腳位 21 | VIO — I/O supply voltage |
| 腳位 22 | NC — No connect |
| 腳位 23 | NC — No connect |
| 腳位 24 | AVDD — Analog power supply |
典型應用
AD7172-2BRUZ 適用於 6 應用s: Industrial Process Control, Medical Instrumentation, Weigh Scale Systems, Temperature Measurement, Pressure Sensing, Portable Instrumentation.
Industrial Process Control
The AD7172-2BRUZ is ideal for industrial process control due to its high resolution and low noise. It can accurately digitize signals from sensors such as pressure transmitters and temperature transducers, enabling precise monitoring and control in factory automation. The device's 24-bit resolution and programmable digital filter allow rejection of 50 Hz/60 Hz interference, ensuring stable readings in noisy industrial environments. Its SPI interface simplifies integration with microcontrollers, and the true rail-to-rail buffers allow direct connection to high-impedance sensors without additional signal conditioning.
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Medical Instrumentation
In medical instrumentation, the AD7172-2BRUZ provides the high precision and low power consumption required for portable and battery-powered devices. Its 24-bit resolution ensures accurate measurement of physiological signals such as temperature and pressure. The device's low noise performance is critical for applications like patient monitoring, where small signal variations must be detected reliably. The integrated buffers and flexible input configuration support various sensor types, while the SPI interface allows easy data transfer to processing units. The wide supply voltage range accommodates different battery configurations.
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Weigh Scale Systems
The AD7172-2BRUZ is well-suited for weigh scale systems, offering 24-bit resolution and low noise to accurately digitize load cell outputs. Its high resolution enables precise weight measurements, essential for commercial and industrial scales. The device's programmable digital filter can be optimized for settling time versus noise, allowing fast and stable readings. The true rail-to-rail buffers simplify the interface to bridge sensors, and the SPI interface facilitates communication with microcontrollers for display and control. The low power consumption is beneficial for battery-powered scales.
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Temperature Measurement
The AD7172-2BRUZ is ideal for temperature measurement applications, providing high resolution and accuracy for thermocouples, RTDs, and thermistors. Its 24-bit resolution allows detection of minute temperature changes, crucial for precision control in industrial and laboratory settings. The device's low noise performance ensures stable readings, and the programmable digital filter can reject 50 Hz/60 Hz interference. The integrated buffers allow direct connection to high-impedance sensors, and the SPI interface enables easy integration with data loggers or controllers. The wide supply voltage range supports various system designs.
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Pressure Sensing
The AD7172-2BRUZ is well-suited for pressure sensing applications, offering high resolution and low noise to accurately digitize signals from pressure transducers. Its 24-bit resolution enables precise pressure measurements, essential for industrial and automotive applications. The device's programmable digital filter can be adjusted to balance noise and settling time, and the true rail-to-rail buffers simplify interfacing with bridge-type sensors. The SPI interface allows easy communication with microcontrollers for data processing and control. The low power consumption is advantageous for remote or battery-powered sensors.
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Portable Instrumentation
The AD7172-2BRUZ is ideal for portable instrumentation due to its low power consumption and high resolution. It enables accurate measurements in battery-powered devices such as handheld multimeters, data loggers, and field analyzers. The device's 24-bit resolution and low noise ensure reliable data acquisition, while the SPI interface allows efficient communication with low-power microcontrollers. The wide supply voltage range supports various battery chemistries, and the compact TSSOP-24 package saves board space. The integrated buffers reduce external component count, simplifying design and reducing overall system power.
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推薦產品摘要
工程參考資料，適用於 AD7172-2BRUZ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | AD7175-2BRUZ | AD7176-2BRUZ | AD7177-2BRUZ |
|---|---|---|---|---|
| Package | 24-Lead TSSOP | 24-Lead TSSOP | 24-Lead TSSOP | 24-Lead TSSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 24 Bit | 24 Bit | 24 Bit | 32 Bit |
| Output Data Rate | 31.25 kSPS | 250 kSPS | 250 kSPS | 10 kSPS |
| Input Channels | 2 Diff/4 SE | 2 Diff/4 SE | 2 Diff/4 SE | 2 Diff/4 SE |
| Supply Voltage | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V |
| Interface | SPI | SPI | SPI | SPI |
| Internal Reference | 2.5 V | 2.5 V | 2.5 V | 2.5 V |
主要差異化特點
- True rail-to-rail input buffers (對比AD7799BRUZ)
- Higher output data rate (對比AD7799BRUZ)
- Pin-compatible with higher-performance family (對比AD7175-2BRUZ)
設計說明
The AD7172-2BRUZ operates from 2.5 V to 5.5 V. Use separate analog and digital supply pins (AVDD and DVDD) with proper decoupling capacitors (0.1 uF and 10 uF) placed close to the pins. A clean analog supply is critical for maintaining the ADC's low noise performance.
For optimal performance, use a solid ground plane and separate analog and digital ground areas, connecting them at a single point. Keep analog input traces short and shielded from digital signals. Place the reference decoupling capacitor close to the REF+ and REF- pins to minimize noise.
Ensure the analog input signals are within the common-mode range specified in the datasheet. The AD7172-2BRUZ requires an external reference for best performance; using the internal reference may degrade accuracy. Also, configure the digital filter appropriately to reject 50 Hz/60 Hz interference in industrial environments.
合規資訊
RoHS compliant per distributor listings. No AEC-Q100 qualification indicated for this part.
