AD7795BRUZ - 16-Bit Sigma-Delta ADC, 6-Channel | Analog Devices
MPN: AD7795BRUZ ✓ Hoạt độngAD7795BRUZ Tóm tắt
An analog-to-digital converter (ADC) is a device that converts continuous analog signals into discrete digital values. The AD7795BRUZ is a sigma-delta ADC, a type of ADC that 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 in applications requiring accurate measurement of physical quantities such as temperature, pressure, and strain. The on-chip in-amp allows direct interfacing of small amplitude signals, eliminating the need for external amplification stages.
Key features of the AD7795BRUZ include a 16-bit resolution, six differential input channels, a programmable gain amplifier (PGA) with gains of 1, 2, 4, 8, 16, 32, 64, and 128, and a low noise performance of 23 effective bits at 16.7 Hz output rate. The device also features a low power consumption of 400 µA typical, with a power-down mode that reduces current to 1 µA max. It includes an internal band gap reference with low drift, and can accept up to two external differential references. The ADC communicates via a serial interface, compatible with SPI, and operates over a temperature range of -40°C to +105°C.
The AD7795BRUZ is designed for high precision measurement applications, including temperature sensing with RTDs and thermocouples, pressure measurement, and weigh scales. Its low noise and high resolution make it ideal for bridge sensors and other low-level signal conditioning. The device is available in a 24-lead TSSOP package, which is compact and suitable for space-constrained designs. The package is RoHS compliant and lead-free.
Typical applications include industrial process control, medical instrumentation, and portable battery-powered devices. The low power consumption and power-down mode extend battery life in portable applications. The on-chip in-amp and reference reduce external component count, simplifying design and improving reliability.
When designing with the AD7795BRUZ, it is important to provide adequate decoupling on the AVDD and DVDD supplies, and to use a clean analog ground plane. The reference inputs should be bypassed with low ESR capacitors. The serial interface should be isolated from noisy digital circuitry to maintain the ADC's noise performance.
Bộ thay thế dễ dàng lắp đặt cho AD7795BRUZ — 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 AD7795BRUZ (cùng hình factor và footprint) — khác nhau ở Package, Resolution, Operating Temperature, Internal Reference, Power Consumption.
AD7794BRUZ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AD7796BRUZ
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →AD7797BRUZ
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →AD7798BRUZ
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →AD7799BRUZ
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →AD7709ARUZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7795BRUZ Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 16 Bit |
| Number of Input Channels | 6 (differential) |
| Tỷ lệ lấy mẫu | 470 SPS |
| Input Type | Differential |
| Data Interface | SPI |
| Điện áp cung cấp | 2.7V to 5.25V |
| Architecture | Sigma-Delta |
| Reference Type | Internal, External |
| Number of A/D Converters | 1 |
| Khoảng nhiệt độ hoạt động | -40°C to +105°C |
| Hộp | 24-TSSOP |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
| Power Consumption | 400 µA typical |
| Power-Down Current | 1 µA max |
| Effective Bits | 23 bits at 16.7 Hz |
| PGA Gains | 1, 2, 4, 8, 16, 32, 64, 128 |
Cấu hình chân AD7795BRUZ
| Chân 1 | SCLK — Serial clock input |
| Chân 2 | DIN — Serial data input |
| Chân 3 | DOUT/RDY — Serial data output / ready |
| Chân 4 | CS — Chip select |
| Chân 5 | GND — Ground |
| Chân 6 | AVDD — Analog power supply |
| Chân 7 | AIN1(+) — Analog input 1 positive |
| Chân 8 | AIN1(-) — Analog input 1 negative |
| Chân 9 | AIN2(+) — Analog input 2 positive |
| Chân 10 | AIN2(-) — Analog input 2 negative |
| Chân 11 | AIN3(+) — Analog input 3 positive |
| Chân 12 | AIN3(-) — Analog input 3 negative |
| Chân 13 | AIN4(+) — Analog input 4 positive |
| Chân 14 | AIN4(-) — Analog input 4 negative |
| Chân 15 | AIN5(+) — Analog input 5 positive |
| Chân 16 | AIN5(-) — Analog input 5 negative |
| Chân 17 | AIN6(+) — Analog input 6 positive |
| Chân 18 | AIN6(-) — Analog input 6 negative |
| Chân 19 | REFIN1(+) — Reference input 1 positive |
| Chân 20 | REFIN1(-) — Reference input 1 negative |
| Chân 21 | REFIN2(+) — Reference input 2 positive |
| Chân 22 | REFIN2(-) — Reference input 2 negative |
| Chân 23 | DVDD — Digital power supply |
| Chân 24 | GND — Ground |
Ứng dụng tiêu biểu
AD7795BRUZ phù hợp cho 6 Áp dụngs: Temperature Sensing, Pressure Measurement, Weigh Scales, Industrial Process Control, Medical Instrumentation, Portable Battery-Powered Devices.
Temperature Sensing
The AD7795BRUZ is ideal for temperature measurement using RTDs and thermocouples. Its low noise (23 effective bits) and programmable gain amplifier (up to 128) allow direct connection to small-signal sensors. The internal reference and excitation current sources simplify the analog front end, reducing external components. With a 16-bit resolution and 470 SPS max rate, it provides accurate, stable readings for industrial process control and medical monitoring. The low power consumption (400 µA) extends battery life in portable thermometers and data loggers.
Được đề xuất
Pressure Measurement
The AD7795BRUZ excels in pressure sensing applications, particularly with bridge sensors. Its differential inputs and PGA (gains 1-128) accommodate the small output voltages of strain-gauge bridges. The on-chip in-amp eliminates the need for external instrumentation amplifiers, simplifying design. The device's low noise and high resolution ensure accurate pressure readings in industrial and automotive systems. The SPI interface allows easy integration with microcontrollers. Power-down mode (1 µA) is beneficial for battery-operated pressure loggers.
Được đề xuất
Weigh Scales
The AD7795BRUZ is well-suited for weigh scale applications, where precision and low noise are critical. Its 16-bit resolution and 23 effective bits at low data rates provide the accuracy needed for load cell measurements. The PGA allows direct connection to load cells without external amplification. The internal reference and excitation current sources reduce component count and improve reliability. The low power consumption is ideal for portable scales. The SPI interface simplifies communication with display controllers or microcontrollers.
Được đề xuất
Industrial Process Control
The AD7795BRUZ is a complete analog front end for industrial process control, handling multiple sensor inputs (up to 6 differential channels). Its wide supply voltage range (2.7V to 5.25V) and extended temperature range (-40°C to +105°C) make it suitable for harsh environments. The device's low noise and high resolution ensure accurate monitoring of temperature, pressure, and flow. The SPI interface allows easy integration with PLCs and microcontrollers. The power-down mode helps reduce energy consumption in remote monitoring stations.
Được đề xuất
Medical Instrumentation
The AD7795BRUZ is used in medical instrumentation such as patient monitors and diagnostic equipment. Its low noise and high resolution are essential for accurate measurement of physiological signals like temperature and pressure. The low power consumption (400 µA) is critical for battery-powered portable devices. The on-chip in-amp and reference reduce external components, making the design compact and reliable. The SPI interface enables seamless data transfer to processing units. The device's small TSSOP package is ideal for space-constrained medical devices.
Được đề xuất
Portable Battery-Powered Devices
The AD7795BRUZ is ideal for portable, battery-powered devices due to its low power consumption (400 µA typical) and power-down mode (1 µA max). It is used in handheld data loggers, portable gas detectors, and wireless sensor nodes. The device's low noise and high resolution ensure accurate measurements even with small battery voltages. The internal reference and PGA reduce external component count, saving board space and power. The SPI interface allows efficient communication with low-power microcontrollers. The wide supply voltage range (2.7V to 5.25V) accommodates various battery chemistries.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD7795BRUZ — 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 | AD7794BRUZ | AD7796BRUZ | AD7797BRUZ | AD7798BRUZ | AD7799BRUZ | AD7709ARUZ |
|---|---|---|---|---|---|---|---|
| Package | 24-TSSOP | 24-TSSOP | 24-TSSOP | 24-TSSOP | 24-TSSOP | 24-TSSOP | 24-TSSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 16 Bit | 24 Bit | 16 Bit | 16 Bit | 16 Bit | 24 Bit | 16 Bit |
| Number of Channels | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Max Sampling Rate | 470 SPS | 470 SPS | 470 SPS | 470 SPS | 470 SPS | 470 SPS | 500 SPS |
| Supply Voltage | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V |
| Power Consumption | 400 µA | 400 µA | 400 µA | 400 µA | 400 µA | 400 µA | 400 µA |
| Interface | SPI | SPI | SPI | SPI | SPI | SPI | SPI |
Bảo phân biệt quan trọng
- On-chip instrumentation amplifier (vsAD7709ARUZ)
- Low power consumption (vsAD7709ARUZ)
- Higher resolution alternative available (vsAD7794BRUZ)
Ghi chú thiết kế
Decouple AVDD and DVDD with 10 µF and 0.1 µF capacitors placed close to the pins. Use separate analog and digital ground planes, connecting them at a single point to minimize noise coupling. The AD7795BRUZ consumes 400 µA typical, so ensure the supply can handle transient currents during conversion.
Place the reference decoupling capacitors (0.1 µF and 10 µF) as close as possible to the REFIN pins. Use a clean analog ground plane under the ADC and avoid routing digital traces near the analog inputs. The TSSOP package has a thermal pad; connect it to the ground plane for improved thermal performance.
Ensure the input common-mode voltage is within the specified range. The on-chip bias voltage generator can set the common-mode to AVDD/2, but verify it matches the sensor's output. Avoid exceeding the absolute maximum ratings on any pin. Use series resistors to limit current if the input voltage can exceed the supply.
Thông tin tuân thủ
RoHS compliant and lead-free per datasheet. Other compliance information not specified in provided data.
