AD7798BRUZ - 16-Bit Sigma-Delta ADC, 3-Channel | Analog Devices
MPN： AD7798BRUZ ✓ 啟用中AD7798BRUZ 概覽
A Sigma-Delta ADC is a type of analog-to-digital converter that uses oversampling and noise shaping to achieve high resolution and excellent noise performance. It is ideal for low-frequency, high-precision applications such as sensor measurement, industrial process control, and instrumentation. The AD7798BRUZ belongs to the family of Sigma-Delta ADCs, which are part of the broader category of data converters, essential in bridging analog signals to digital processing systems.
Key features of the AD7798BRUZ include a programmable output data rate from 4.17 Hz to 470 Hz, RMS noise as low as 1.5 µV (at 4.17 Hz), and a typical supply current of 400 µA, with a power-down mode consuming only 1 µA. The on-chip in-amp provides gain up to 128, allowing direct connection to low-level sensors such as thermocouples and strain gauges. The SPI-compatible serial interface simplifies communication with microcontrollers and DSPs.
The device architecture includes a chopper-stabilized amplifier, a Sigma-Delta modulator, and a digital filter, ensuring high accuracy and low offset drift. The internal reference and clock reduce external component count, while the low-side power switch enables bridge sensor excitation. The AD7798BRUZ is specified for the industrial temperature range of -40°C to +105°C, making it suitable for harsh environments.
Typical applications include temperature measurement with RTDs and thermocouples, pressure and strain gauge sensing, and battery monitoring. Its low power consumption and high resolution make it ideal for portable and battery-powered instruments. The device is also used in weigh scales and process control systems where precision is critical.
When designing with the AD7798BRUZ, ensure proper decoupling of the AVDD and DVDD supplies with 0.1 µF and 10 µF capacitors, and place the reference decoupling capacitor close to the REFIN pins. The SPI interface should be isolated if the ADC is remote from the controller to avoid ground loops.
直接替換替代品，適用於 AD7798BRUZ — 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： AD7798BRUZ （相同外形與佔位） — 差異在於 Package, Resolution, Supply Voltage, Reference Type, Number of Channels.
AD7799BRUZ
✅ 直接替換聯絡詢價
查看資料表 →AD7781BRUZ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ADS1112IDRCT
✅ 直接替換📋 參考替代品（不在目錄中）
TC3405VQRTR
✅ 直接替換📋 參考替代品（不在目錄中）
ADS1112DRCR
✅ 直接替換📋 參考替代品（不在目錄中）
AD7798BRUZ 最大額定值與電氣特性
| 解析度 | 16 Bit |
| Number of Channels | 3 Input |
| Architecture | Sigma-Delta |
| Output Data Rate | 4.17 Hz to 470 Hz |
| RMS Noise | 1.5 µV at 4.17 Hz |
| 供應電壓 | 2.7V to 5.25V |
| 供應電流 | 400 µA typ |
| Power-Down Current | 1 µA max |
| On-Chip In-Amp Gain | Up to 128 |
| 介面 | SPI |
| 封裝 | 16-Lead TSSOP |
| 工作溫度 | -40°C to +105°C |
| RoHS | Compliant |
| MSL 等級 | 1 (Unlimited) |
| ECCN | EAR99 |
AD7798BRUZ 腳位配置
| 腳位 1 | SCLK — Serial clock input for SPI interface |
| 腳位 2 | DIN — Serial data input for SPI interface |
| 腳位 3 | DOUT — Serial data output for SPI interface |
| 腳位 4 | CS — Chip select input (active low) |
| 腳位 5 | GND — Ground |
| 腳位 6 | AVDD — Analog power supply |
| 腳位 7 | DVDD — Digital power supply |
| 腳位 8 | REFIN(+) — Positive reference input |
| 腳位 9 | REFIN(-) — Negative reference input |
| 腳位 10 | AIN1(+) — Positive analog input 1 |
| 腳位 11 | AIN1(-) — Negative analog input 1 |
| 腳位 12 | AIN2(+) — Positive analog input 2 |
| 腳位 13 | AIN2(-) — Negative analog input 2 |
| 腳位 14 | AIN3(+) — Positive analog input 3 |
| 腳位 15 | AIN3(-) — Negative analog input 3 |
| 腳位 16 | PWRDN — Power-down input (active low) |
典型應用
AD7798BRUZ 適用於 6 應用s: Temperature Measurement, Pressure and Strain Gauge Sensing, Battery Monitoring, Weigh Scales, Process Control, Portable Instrumentation.
Temperature Measurement
The AD7798BRUZ is ideal for temperature measurement with RTDs and thermocouples. Its on-chip in-amp with gain up to 128 allows direct connection to low-level sensor outputs, while the 16-bit resolution and low noise (1.5 µV RMS) ensure accurate temperature readings. The low power consumption (400 µA) makes it suitable for battery-powered temperature loggers. The SPI interface simplifies data transfer to a microcontroller for processing and display.
推薦
Pressure and Strain Gauge Sensing
The AD7798BRUZ is well-suited for pressure and strain gauge applications due to its low noise and programmable gain. The on-chip in-amp can amplify small bridge outputs, and the low-side power switch can be used to excite the bridge. The 16-bit resolution provides sufficient dynamic range for most industrial pressure sensors. Its low power consumption is beneficial for portable pressure monitors. The SPI interface allows easy integration with microcontrollers for data logging and control.
推薦
Battery Monitoring
The AD7798BRUZ is used in battery monitoring systems to measure voltage and current with high accuracy. Its low supply current (400 µA) and power-down mode (1 µA) help extend battery life in portable devices. The three differential inputs can measure battery voltage, current shunt voltage, and temperature simultaneously. The internal reference and clock reduce external component count, simplifying design. The SPI interface enables communication with a host controller for state-of-charge estimation.
推薦
Weigh Scales
The AD7798BRUZ is commonly used in weigh scale applications due to its high resolution and low noise. The on-chip in-amp with gain up to 128 can amplify the small output from a load cell, and the low-side power switch can drive the bridge excitation. The 16-bit resolution provides adequate accuracy for many industrial and consumer scales. The low power consumption is ideal for battery-operated scales. The SPI interface allows easy calibration and data readout.
推薦
Process Control
The AD7798BRUZ is suitable for process control systems requiring precise analog-to-digital conversion. Its three differential inputs can monitor multiple sensors, and the programmable gain allows adaptation to various signal levels. The industrial temperature range (-40°C to +105°C) ensures reliable operation in harsh environments. The SPI interface enables communication with PLCs or microcontrollers for closed-loop control. The low power consumption is beneficial for remote or battery-powered field instruments.
推薦
Portable Instrumentation
The AD7798BRUZ is ideal for portable instrumentation due to its low power consumption and small TSSOP-16 package. It operates from a single 2.7V to 5.25V supply, making it compatible with battery-powered designs. The power-down mode (1 µA) extends battery life during idle periods. The on-chip reference and clock reduce external components, saving board space. The SPI interface allows connection to low-power microcontrollers for data logging and display.
推薦
推薦產品摘要
工程參考資料，適用於 AD7798BRUZ — 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 | AD7799BRUZ | AD7781BRUZ | ADS1112IDRCT | TC3405VQRTR |
|---|---|---|---|---|---|
| Package | 16-Lead TSSOP | 16-Lead TSSOP | 16-Lead TSSOP | 16-Lead TSSOP | 16-Lead TSSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Microchip Technology |
| Resolution | 16 Bit | 24 Bit | 24 Bit | 16 Bit | 16 Bit |
| Number of Channels | 3 | 3 | 1 | 4 | 4 |
| Interface | SPI | SPI | SPI | I2C | SPI |
| Supply Voltage | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.5V | 2.7V to 5.5V |
| Supply Current | 400 µA | 400 µA | 250 µA | 240 µA | 400 µA |
主要差異化特點
- On-chip in-amp with gain up to 128 (對比ADS1112IDRCT)
- Lower power consumption (對比TC3405VQRTR)
- Higher resolution alternative available (對比AD7799BRUZ)
設計說明
Decouple AVDD and DVDD with 0.1 µF and 10 µF capacitors placed close to the pins. Use separate analog and digital ground planes to minimize noise coupling. The AD7798BRUZ operates from 2.7V to 5.25V; ensure the supply is clean and stable for optimal performance.
Place the reference decoupling capacitor close to the REFIN pins. Use a 0.1 µF capacitor for REFIN(+) and REFIN(-) to ground. For best noise performance, use a low-ESR ceramic capacitor. Keep the analog input traces short and shielded to avoid interference.
Ensure the SPI interface is properly isolated if the ADC is remote from the controller to avoid ground loops. Use series resistors on SPI lines to reduce ringing. Also, avoid floating unused analog inputs; tie them to a common-mode voltage or ground to prevent noise pickup.
合規資訊
RoHS3 compliant, REACH unaffected, MSL 1 (Unlimited) per PartGenie. Halogen free per GlobalSpec.