AD7793BRUZ - 24-Bit Sigma-Delta ADC, 3-Channel | Analog Devices
MPN: AD7793BRUZ ✓ AktifAD7793BRUZ Genel Bakış
A sigma-delta ADC is a type of analog-to-digital converter that uses oversampling and noise shaping to achieve high resolution. It is part of the ADC family, which converts analog signals to digital for processing in microcontrollers and DSPs. Sigma-delta ADCs are known for their high resolution and excellent noise performance, making them suitable for precision instrumentation and sensor interfaces.
Key features include a programmable gain amplifier (PGA) with gains from 1 to 128, a precision low noise, low drift internal band gap reference, and the ability to accept an external differential reference. The device also includes programmable excitation current sources, burnout currents, and a bias voltage generator. It communicates via a SPI-compatible serial interface and operates over a temperature range of -40°C to +105°C.
The AD7793BRUZ uses a sigma-delta modulator with a digital filter, providing flexible output data rates from 4.17 Hz to 470 Hz. The on-chip PGA allows direct connection to low-level sensors such as thermocouples and strain gauges, while the internal reference ensures accuracy without external components. The device's low power consumption of 400 uA typical makes it suitable for battery-powered applications.
Typical applications include temperature measurement with RTDs and thermocouples, pressure and strain gauge interfaces, and industrial process control. The device's low noise and high resolution enable precise measurements in harsh environments. Its SPI interface simplifies connection to microcontrollers, and the small TSSOP package saves board space.
When designing with the AD7793BRUZ, ensure proper decoupling of the AVDD and DVDD supplies with 0.1 uF and 10 uF capacitors. The reference input should be bypassed with a 0.1 uF capacitor. For optimal noise performance, use a low-noise analog supply and keep digital traces away from analog inputs.
Drop-in alternatifler için AD7793BRUZ — aynı paket, pin-başına uyumlu. PCB yeniden montajı gerektiren farklı paket bileşenleri dışlanmıştır.
Bu Serideki Variantlar
Yedek parça uyumlu olan aynı serideki modeller AD7793BRUZ (aynı form faktörü ve ayağa oturma) — farklı olan Package, Resolution, Operating Temperature Range, Supply Voltage, Current Consumption.
AD7793BRUZ-REEL
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AD7792BRUZ
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| Çözünürlük | 24 Bit |
| Number of Channels | 3 Differential |
| Input Type | Differential |
| Data Interface | SPI |
| Ölçekleme Oranı | 470 SPS |
| Architecture | Sigma-Delta |
| Besleme Gerilimi | 2.7 V to 5.25 V |
| İşletim Sıcaklığı | -40C to +105C |
| Paket | 16-TSSOP |
| Montaj Türü | Surface Mount |
| RMS Noise | 1.5 uV at 16.7 Hz |
| Effective Resolution | 23 bits |
| PGA Gain | 1 to 128 |
| Current Consumption | 400 uA typical |
| Power-Down Current | 1 uA maximum |
| Reference | Internal or External Differential |
| RoHS Durumu | Compliant |
AD7793BRUZ Pin Yapısı
| Pin 1 | SCLK — Serial clock input |
| Pin 2 | DIN — Serial data input |
| Pin 3 | DOUT/RDY — Serial data output / ready |
| Pin 4 | CS — Chip select |
| Pin 5 | GND — Ground |
| Pin 6 | AVDD — Analog power supply |
| Pin 7 | AIN1(+) — Analog input 1 positive |
| Pin 8 | AIN1(-) — Analog input 1 negative |
| Pin 9 | AIN2(+) — Analog input 2 positive |
| Pin 10 | AIN2(-) — Analog input 2 negative |
| Pin 11 | AIN3(+) — Analog input 3 positive |
| Pin 12 | AIN3(-) — Analog input 3 negative |
| Pin 13 | REFIN(+) — Reference input positive |
| Pin 14 | REFIN(-) — Reference input negative |
| Pin 15 | DVDD — Digital power supply |
| Pin 16 | SYNC — Synchronization input |
Tipik Uygulamalar
AD7793BRUZ için uygundur 6 uygulamas: Temperature Measurement, Pressure and Strain Gauge Interfaces, Industrial Process Control, Weigh Scales, Portable Instrumentation, Medical Monitoring.
Temperature Measurement
The AD7793BRUZ is ideal for temperature measurement with RTDs and thermocouples due to its low noise (1.5 uV RMS) and on-chip PGA with gains up to 128. It can directly interface with low-level sensor outputs, and the internal reference ensures accuracy. The device's 24-bit resolution allows precise temperature readings over a wide range, making it suitable for industrial process control and laboratory instruments.
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Pressure and Strain Gauge Interfaces
With its high resolution and low noise, the AD7793BRUZ is well-suited for pressure sensors and strain gauges. The on-chip PGA allows direct connection to bridge sensors, amplifying small differential signals. The device's low power consumption (400 uA) is beneficial for battery-powered portable instruments. The SPI interface simplifies data transfer to microcontrollers for real-time monitoring.
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Industrial Process Control
The AD7793BRUZ is designed for industrial process control, offering robust performance over -40°C to +105°C. Its 24-bit resolution and programmable gain enable accurate monitoring of process variables like flow, level, and temperature. The device's low drift internal reference reduces external component count, and the SPI interface allows easy integration with PLCs and industrial controllers.
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Weigh Scales
The AD7793BRUZ is commonly used in weigh scale applications due to its high resolution and low noise, which are critical for accurate weight measurement. The on-chip PGA can amplify the small signals from load cells, and the internal reference ensures stable performance. The device's low power consumption is advantageous for portable scales, and its SPI interface allows easy calibration and data readout.
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Portable Instrumentation
The AD7793BRUZ's low power consumption (400 uA typical) and small 16-TSSOP package make it ideal for portable instrumentation. It can operate from a 3.3V battery supply and provides high-resolution measurements for handheld meters, data loggers, and field analyzers. The device's power-down mode (1 uA max) further extends battery life in duty-cycled applications.
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Medical Monitoring
The AD7793BRUZ is suitable for medical monitoring devices such as patient vital signs monitors and diagnostic equipment. Its high resolution and low noise enable accurate measurement of physiological signals like temperature and pressure. The device's low power consumption is critical for battery-operated medical devices, and its SPI interface allows integration with medical-grade microcontrollers.
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Önerilen Ürünler Özeti
Mühendislik referans verileri: AD7793BRUZ — karşılaştırma, tasarım rehberi ve uyumluluk bilgileri.
Seçim Kılavuzu
Alternatiflerle Karşılaştırma
| Parametre | Bu Ürün | AD7793BRUZ-REEL | AD7792BRUZ | AD7794BRUZ | ADS1220 | AD7124-4 |
|---|---|---|---|---|---|---|
| Package | 16-TSSOP | 16-TSSOP | 16-TSSOP | 24-TSSOP | 16-TSSOP | 24-TSSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Analog Devices |
| Resolution | 24-bit | 24-bit | 16-bit | 24-bit | 24-bit | 24-bit |
| Number of Channels | 3 differential | 3 differential | 3 differential | 6 differential | 4 differential | 4 differential |
| Supply Voltage | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.3V to 5.5V | 2.7V to 5.25V |
| RMS Noise | 1.5 uV at 16.7 Hz | 1.5 uV at 16.7 Hz | 1.5 uV at 16.7 Hz | 1.5 uV at 16.7 Hz | 1.8 uV at 20 SPS | 1.5 uV at 16.7 Hz |
| PGA Gain | 1 to 128 | 1 to 128 | 1 to 128 | 1 to 128 | 1 to 128 | 1 to 128 |
| Interface | SPI | SPI | SPI | SPI | SPI | SPI |
Ana Farklılayıcılar
- 24-bit resolution with low noise (karşılaştırma:AD7792BRUZ)
- On-chip instrumentation amplifier and reference (karşılaştırma:ADS1220)
- Lower power consumption (karşılaştırma:AD7124-4)
Tasarım Notları
Decouple the AVDD and DVDD supplies with 0.1 uF and 10 uF capacitors placed close to the pins. Use separate analog and digital ground planes to minimize noise coupling. The AD7793BRUZ operates from 2.7V to 5.25V, so ensure the supply is clean and within this range.
For optimal noise performance, keep analog input traces short and shielded from digital signals. Bypass the reference input with a 0.1 uF capacitor. Use a low-noise analog supply and avoid routing digital traces near the analog inputs. A solid ground plane under the ADC is recommended.
Do not exceed the absolute maximum ratings for supply voltage and input pins. Ensure the reference voltage is stable and within the specified range. When using the internal reference, place a 0.1 uF capacitor on the REFOUT pin. Also, avoid floating unused input pins; tie them to a known potential.
Uyumluluk Bilgisi
RoHS compliant per distributor listings. No AEC-Q100 qualification indicated for this part.
