AD7796BRUZ - 16-Bit Sigma-Delta ADC for Bridge Sensors | Analog Devices
MPN: AD7796BRUZ ⚠ Last Time Buy| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.85 | $4.85 |
| 10 | $4.36 | $43.60 |
| 100 | $3.88 | $388.00 |
| 500 | $3.49 | $1,745.00 |
| 1,000 | $3.1 | $3,100.00 |
AD7796BRUZ Overview
An analog-to-digital converter (ADC) is a critical component in electronic systems that converts continuous analog signals into discrete digital values for processing by microcontrollers or digital signal processors. Sigma-delta ADCs, like the AD7796, use oversampling and noise shaping to achieve high resolution and excellent noise performance, making them ideal for precision measurement applications. The AD7796 belongs to the family of sigma-delta ADCs, which are widely used in industrial instrumentation, medical devices, and sensor interfaces where accuracy is paramount.
Key features of the AD7796BRUZ include a fixed gain of 128, which eliminates the need for external amplification stages, and a low power consumption of typically 1.5 mA, making it suitable for battery-powered applications. The device also includes an on-chip temperature sensor, a reference voltage source, and a serial interface compatible with SPI, simplifying system integration. The ADC supports a data rate of up to 470 Hz, providing fast conversion for real-time monitoring.
The AD7796BRUZ utilizes a sigma-delta modulator followed by a digital filter, achieving high resolution and low noise. The on-chip instrumentation amplifier with a gain of 128 allows direct connection to bridge sensors, reducing external component count and improving system reliability. The device also features a differential input, which helps reject common-mode noise, and a programmable gain amplifier that can be configured for various sensor outputs.
Typical applications for the AD7796BRUZ include weigh scales, strain gauge measurements, pressure sensors, and other bridge-based sensing systems. Its high resolution and low noise make it ideal for precision industrial and medical instrumentation. The device is also suitable for portable devices due to its low power consumption.
When designing with the AD7796BRUZ, it is important to ensure proper decoupling of the power supply and careful PCB layout to minimize noise. The reference voltage should be stable and low-noise to achieve optimal performance. Additionally, the SPI interface should be configured correctly to avoid communication errors.
Drop-in alternatives for AD7796BRUZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AD7796BRUZ (same form factor and footprint) — differing in Package, Resolution, Supply Voltage, Operating Temperature, Number of Channels.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7797BRUZ
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View Datasheet →AD7796BRUZ Maximum Ratings & Electrical Characteristics
| Resolution | 16 Bit |
| Number of Inputs | 1 |
| Input Type | Differential |
| Architecture | Sigma-Delta |
| Gain | 128 (fixed) |
| Data Rate | 470 Hz (max) |
| Supply Voltage | 2.7 V to 5.25 V |
| Supply Current | 1.5 mA (typical) |
| Interface | SPI |
| Package | 16-Lead TSSOP |
| Operating Temperature | -40C to +105C |
| On-Chip Temperature Sensor | Yes |
| Reference Voltage | Internal or external |
| RoHS | Compliant |
| Lifecycle Status | Last Time Buy |
AD7796BRUZ Pin Configuration
| Pin 1 | SCLK — Serial clock input for SPI interface |
| Pin 2 | DIN — Serial data input for SPI interface |
| Pin 3 | DOUT — Serial data output for SPI interface |
| Pin 4 | CS — Chip select input (active low) |
| Pin 5 | GND — Ground |
| Pin 6 | AVDD — Analog power supply |
| Pin 7 | AINP — Positive analog input |
| Pin 8 | AINN — Negative analog input |
| Pin 9 | REFIN+ — Positive reference input |
| Pin 10 | REFIN- — Negative reference input |
| Pin 11 | DVDD — Digital power supply |
| Pin 12 | DOUT/RDY — Data output / ready indicator |
| Pin 13 | SYNC — Synchronization input |
| Pin 14 | PDR — Power-down reset input |
| Pin 15 | NC — No connect |
| Pin 16 | NC — No connect |
Typical Applications
AD7796BRUZ is suitable for 6 applications: Weigh Scales, Strain Gauge Measurements, Pressure Sensors, Industrial Process Control, Medical Instrumentation, Portable Instrumentation.
Weigh Scales
The AD7796BRUZ is ideal for weigh scales due to its high resolution (16-bit) and fixed gain of 128, which allows direct connection to load cells. The sigma-delta architecture provides low noise, ensuring accurate weight measurements. The SPI interface simplifies data transfer to a microcontroller. The low power consumption (1.5 mA) is beneficial for battery-operated scales. The device's differential input rejects common-mode noise, improving measurement stability. With a data rate up to 470 Hz, it supports fast and precise readings. The on-chip temperature sensor can compensate for temperature drift, enhancing accuracy. The TSSOP package is compact, fitting space-constrained designs. Overall, the AD7796BRUZ provides a complete analog front end for weigh scale applications, reducing external components and design complexity.
Recommended
Strain Gauge Measurements
The AD7796BRUZ is well-suited for strain gauge measurements, where small resistance changes need to be accurately converted to digital values. The fixed gain of 128 amplifies the tiny signals from strain gauges, eliminating the need for external amplifiers. The 16-bit resolution provides sufficient precision for most strain measurement applications. The sigma-delta architecture ensures low noise, critical for detecting small strain variations. The differential input helps reject common-mode noise from the bridge circuit. The SPI interface allows easy integration with microcontrollers for data processing. The low power consumption is advantageous for portable strain measurement devices. The device's wide supply voltage range (2.7V to 5.25V) accommodates various system power rails. The TSSOP package is suitable for compact designs. Overall, the AD7796BRUZ simplifies strain gauge signal conditioning, improving reliability and reducing component count.
Recommended
Pressure Sensors
The AD7796BRUZ is designed for pressure sensor applications, particularly those using bridge-based sensing elements. The fixed gain of 128 allows direct connection to pressure sensor bridges, which typically output small differential voltages. The 16-bit resolution provides good accuracy for pressure measurements. The sigma-delta architecture offers excellent noise performance, essential for precise pressure readings. The device's low power consumption (1.5 mA) is ideal for battery-powered pressure transmitters. The SPI interface enables easy communication with microcontrollers for data logging and control. The on-chip temperature sensor can be used for temperature compensation, improving accuracy over temperature. The wide supply voltage range supports both 3.3V and 5V systems. The TSSOP package is compact, suitable for industrial pressure transmitters. Overall, the AD7796BRUZ provides a complete signal chain for pressure sensors, reducing design complexity.
Recommended
Industrial Process Control
The AD7796BRUZ is suitable for industrial process control applications that require high precision analog-to-digital conversion of sensor signals. Its 16-bit resolution and low noise ensure accurate monitoring of process variables such as temperature, pressure, and flow. The fixed gain of 128 is ideal for bridge-type sensors commonly used in industrial transmitters. The device operates over a wide temperature range (-40C to +105C), making it robust for harsh industrial environments. The SPI interface allows easy integration with PLCs and microcontrollers. The low power consumption is beneficial for loop-powered instruments. The differential input rejects common-mode noise, improving signal integrity in noisy industrial settings. The on-chip temperature sensor can aid in system diagnostics. The TSSOP package is suitable for compact industrial modules. Overall, the AD7796BRUZ enhances measurement accuracy and reliability in industrial process control systems.
Recommended
Medical Instrumentation
The AD7796BRUZ is well-suited for medical instrumentation, such as patient monitoring systems and diagnostic equipment, where precision and low noise are critical. The 16-bit resolution and sigma-delta architecture provide accurate conversion of physiological signals from bridge-based sensors, such as pressure transducers. The fixed gain of 128 amplifies small signals, reducing the need for external amplification. The low power consumption (1.5 mA) is essential for battery-powered medical devices. The device operates over a wide temperature range, ensuring reliability in clinical environments. The SPI interface enables seamless integration with medical-grade microcontrollers. The differential input helps reject common-mode interference, improving signal quality. The on-chip temperature sensor can be used for calibration. The TSSOP package is compact, suitable for portable medical devices. Overall, the AD7796BRUZ offers a reliable and accurate solution for medical sensing applications.
Recommended
Portable Instrumentation
The AD7796BRUZ is ideal for portable instrumentation due to its low power consumption (1.5 mA) and compact TSSOP package. It is designed for battery-powered devices that require high precision analog-to-digital conversion, such as handheld multimeters, portable scales, and field measurement tools. The fixed gain of 128 allows direct connection to bridge sensors, simplifying the analog front end. The 16-bit resolution provides sufficient accuracy for most portable applications. The sigma-delta architecture ensures low noise, critical for reliable measurements in the field. The SPI interface allows easy communication with low-power microcontrollers. The wide supply voltage range (2.7V to 5.25V) supports various battery chemistries. The device's low power consumption extends battery life, making it suitable for long-term monitoring. The TSSOP package is space-saving, enabling compact product designs. Overall, the AD7796BRUZ is an excellent choice for portable precision measurement devices.
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Recommended Products Summary
Engineering reference data for AD7796BRUZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7797BRUZ | AD7798BRUZ | AD7799BRUZ | AD7781BRUZ | AD7730BRUZ |
|---|---|---|---|---|---|---|
| Package | 16-Lead TSSOP | 16-Lead TSSOP | 16-Lead TSSOP | 16-Lead TSSOP | 16-Lead TSSOP | 16-Lead TSSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 16 Bit | 24 Bit | 16 Bit | 24 Bit | 20 Bit | 24 Bit |
| Gain | 128 (fixed) | 128 (fixed) | 1, 2, 4, 8, 16, 32, 64, 128 | 1, 2, 4, 8, 16, 32, 64, 128 | 1, 2, 4, 8, 16, 32, 64, 128 | 1, 2, 4, 8, 16, 32, 64, 128 |
| Data Rate | 470 Hz (max) | 470 Hz (max) | 470 Hz (max) | 470 Hz (max) | 470 Hz (max) | 800 Hz (max) |
| 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 |
| Supply Current | 1.5 mA (typical) | 1.5 mA (typical) | 1.5 mA (typical) | 1.5 mA (typical) | 1.5 mA (typical) | 1.5 mA (typical) |
| Interface | SPI | SPI | SPI | SPI | SPI | SPI |
Key Differentiators
- Fixed gain of 128 simplifies design (vs AD7798BRUZ)
- Lower cost than 24-bit alternatives (vs AD7797BRUZ)
- Pin-compatible with higher resolution parts (vs AD7799BRUZ)
Design Notes
Ensure proper decoupling of the AVDD and DVDD pins with 0.1uF and 10uF capacitors placed close to the device. The analog and digital supplies should be separated to minimize noise coupling. A low-noise reference voltage is critical for optimal performance; use a precision reference such as the ADR4520 for best results.
For best noise performance, use a solid ground plane and avoid routing digital signals near the analog input pins. Keep the analog input traces short and shielded. The REFIN+ and REFIN- pins should be connected with Kelvin sensing to the reference source to minimize errors. Place the decoupling capacitors as close as possible to the power pins.
The AD7796BRUZ is in Last Time Buy status; ensure sufficient stock for production or consider alternatives like AD7797BRUZ for new designs. The fixed gain of 128 may not be suitable for all sensor outputs; if a different gain is needed, consider AD7798BRUZ. Verify the SPI timing and chip select polarity to avoid communication errors.
Compliance Information
RoHS compliant per Analog Devices product page. No AEC-Q100 qualification for this part.