AD7798BRUZ - 16-Bit Sigma-Delta ADC, 3-Channel | Analog Devices
MPN: AD7798BRUZ ✓ Hoạt độngAD7798BRUZ Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho AD7798BRUZ — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với AD7798BRUZ (cùng hình factor và footprint) — khác nhau ở Package, Resolution, Supply Voltage, Reference Type, Number of Channels.
AD7799BRUZ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AD7781BRUZ
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ADS1112IDRCT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
TC3405VQRTR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS1112DRCR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7798BRUZ Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 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 |
| Điện áp cung cấp | 2.7V to 5.25V |
| Điện áp cung cấp | 400 µA typ |
| Power-Down Current | 1 µA max |
| On-Chip In-Amp Gain | Up to 128 |
| Giao diện | SPI |
| Hộp | 16-Lead TSSOP |
| Nhiệt độ hoạt động | -40°C to +105°C |
| RoHS | Compliant |
| Cấp MSL | 1 (Unlimited) |
| ECCN | EAR99 |
Cấu hình chân AD7798BRUZ
| Chân 1 | SCLK — Serial clock input for SPI interface |
| Chân 2 | DIN — Serial data input for SPI interface |
| Chân 3 | DOUT — Serial data output for SPI interface |
| Chân 4 | CS — Chip select input (active low) |
| Chân 5 | GND — Ground |
| Chân 6 | AVDD — Analog power supply |
| Chân 7 | DVDD — Digital power supply |
| Chân 8 | REFIN(+) — Positive reference input |
| Chân 9 | REFIN(-) — Negative reference input |
| Chân 10 | AIN1(+) — Positive analog input 1 |
| Chân 11 | AIN1(-) — Negative analog input 1 |
| Chân 12 | AIN2(+) — Positive analog input 2 |
| Chân 13 | AIN2(-) — Negative analog input 2 |
| Chân 14 | AIN3(+) — Positive analog input 3 |
| Chân 15 | AIN3(-) — Negative analog input 3 |
| Chân 16 | PWRDN — Power-down input (active low) |
Ứng dụng tiêu biểu
AD7798BRUZ phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD7798BRUZ — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- On-chip in-amp with gain up to 128 (vsADS1112IDRCT)
- Lower power consumption (vsTC3405VQRTR)
- Higher resolution alternative available (vsAD7799BRUZ)
Ghi chú thiết kế
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.
Thông tin tuân thủ
RoHS3 compliant, REACH unaffected, MSL 1 (Unlimited) per PartGenie. Halogen free per GlobalSpec.