AD7797BRUZ - 24-Bit Sigma-Delta ADC for Bridge Sensors | Analog Devices
MPN: AD7797BRUZ ⚠ Last Time Buy| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.42 | $5.42 |
| 10 | $4.93 | $49.30 |
| 100 | $4.1 | $410.00 |
| 500 | $3.68 | $1,840.00 |
| 1,000 | $3.3 | $3,300.00 |
Drop-in alternatives for AD7797BRUZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7796BRUZ
✅ Drop-In✓ In Stock
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View Datasheet →AD7798BRUZ
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View Datasheet →AD7799BRUZ
✅ Drop-In✓ In Stock
$5.24 / Unit
View Datasheet →AD7190BRUZ
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$7.6364 / Unit
View Datasheet →AD7124-4BRUZ
✅ Drop-In✓ In Stock
$7.9545 / Unit
View Datasheet →AD7797BRUZ Maximum Ratings & Electrical Characteristics
| Resolution | 24 Bit |
| Number of Inputs | 1 |
| Input Type | Differential |
| Data Interface | SPI |
| Architecture | Sigma-Delta |
| Gain | 128 (fixed) |
| Supply Voltage | 2.7 V to 5.25 V |
| Power Consumption | 500 µA (typical) |
| Package | 16-TSSOP |
| Operating Temperature | -40°C to +105°C |
| Reference Type | Internal |
| Number of Channels | 1 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lifecycle Status | Last Time Buy |
AD7797BRUZ Pin Configuration
| Pin 1 | SCLK — Serial clock input |
| Pin 2 | DIN — Serial data input |
| Pin 3 | DOUT — Serial data output |
| Pin 4 | CS — Chip select |
| Pin 5 | GND — Ground |
| Pin 6 | AVDD — Analog power supply |
| Pin 7 | AIN+ — Positive analog input |
| Pin 8 | AIN- — Negative analog input |
| Pin 9 | REF+ — Positive reference input |
| Pin 10 | REF- — Negative reference input |
| Pin 11 | DVDD — Digital power supply |
| Pin 12 | DOUT/RDY — Data output/ready |
| Pin 13 | SYNC — Synchronization input |
| Pin 14 | PDRST — Power-down/reset |
| Pin 15 | NC — No connect |
| Pin 16 | NC — No connect |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
AD7797BRUZ is suitable for 6 applications: Weigh Scales, Strain Gauge Measurement, Pressure Sensors, Portable Instruments, Industrial Process Control, Medical Monitoring.
Weigh Scales
The AD7797BRUZ is ideal for weigh scales due to its 24-bit resolution and fixed gain of 128, which allows direct connection to load cells. The low power consumption (500 µA) enables battery-powered operation, and the internal reference simplifies design. The sigma-delta architecture provides high accuracy and noise rejection, ensuring precise weight measurements.
Recommended
Strain Gauge Measurement
The AD7797BRUZ is well-suited for strain gauge measurements, where small signal changes need to be accurately digitized. The fixed gain of 128 amplifies the tiny voltage changes from the strain gauge, and the 24-bit resolution captures fine details. The SPI interface allows easy integration with microcontrollers for data logging and analysis.
Recommended
Pressure Sensors
The AD7797BRUZ is suitable for pressure sensor applications, particularly those using bridge-based sensing elements. Its high resolution and low noise ensure accurate pressure readings. The device's low power consumption is beneficial for portable or remote pressure monitoring systems. The internal reference and burnout current source enhance reliability.
Recommended
Portable Instruments
The AD7797BRUZ is ideal for portable instruments due to its low power consumption of 500 µA and small 16-TSSOP package. It can be powered by a 3V battery, making it suitable for handheld devices. The SPI interface allows efficient communication with low-power microcontrollers, extending battery life.
Recommended
Industrial Process Control
The AD7797BRUZ is used in industrial process control for monitoring bridge-based sensors such as pressure and force transducers. Its wide operating temperature range (-40°C to +105°C) ensures reliable operation in harsh environments. The high resolution and accuracy contribute to precise control loops.
Recommended
Medical Monitoring
The AD7797BRUZ can be used in medical monitoring devices that require high precision measurement of physiological signals from bridge sensors, such as pressure sensors in infusion pumps. Its low power and small size are advantageous for wearable or portable medical devices. The device's accuracy ensures reliable patient monitoring.
Recommended
Engineering reference data for AD7797BRUZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7796BRUZ | AD7798BRUZ | AD7799BRUZ | AD7190BRUZ | AD7124-4BRUZ |
|---|---|---|---|---|---|---|
| Resolution | 24-bit | 16-bit | 16-bit | 24-bit | 24-bit | 24-bit |
| Gain | 128 (fixed) | 128 (fixed) | 1 to 128 (programmable) | 1 to 128 (programmable) | 1 to 128 (programmable) | 1 to 128 (programmable) |
| Supply Voltage | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 4.75V to 5.25V | 2.7V to 5.25V |
| Power Consumption | 500 µA | 500 µA | 500 µA | 500 µA | 6.2 mA | 350 µA |
| Package | 16-TSSOP | 16-TSSOP | 16-TSSOP | 16-TSSOP | 16-TSSOP | 16-TSSOP |
| Number of Channels | 1 | 1 | 1 | 1 | 1 | 4 |
| Data Interface | SPI | SPI | SPI | SPI | SPI | SPI |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
Key Differentiators
- Fixed gain of 128 simplifies bridge sensor interface (vs AD7798BRUZ)
- Lower power consumption than AD7190BRUZ (vs AD7190BRUZ)
- 24-bit resolution vs 16-bit in AD7796BRUZ (vs AD7796BRUZ)
Design Notes
The AD7797BRUZ operates from 2.7V to 5.25V. Use a low-noise LDO to supply AVDD and DVDD separately to minimize digital noise coupling. Decouple each supply pin with 0.1µF and 10µF capacitors placed close to the pins.
For optimal performance, use a solid ground plane and separate analog and digital ground areas, connecting them at a single point. Keep the SPI lines short and shielded if possible. Place the reference decoupling capacitors close to the REF+ and REF- pins.
Avoid routing digital signals near the analog input pins. Ensure the reference voltage is stable and noise-free. The AD7797BRUZ is in 'Last Time Buy' status, so consider alternative parts for new designs to avoid supply issues.
Compliance Information
RoHS compliant per distributor listings. No AEC-Q100 qualification for this part.
