AD7766BRUZ - 24-Bit Oversampled SAR ADC | Analog Devices
MPN: AD7766BRUZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.25 | $112.50 |
| 100 | $10 | $1,000.00 |
| 500 | $9 | $4,500.00 |
| 1,000 | $8.1 | $8,100.00 |
AD7766BRUZ Overview
An oversampled SAR ADC is a type of analog-to-digital converter that combines the benefits of a successive approximation register (SAR) architecture with oversampling techniques to achieve high resolution and excellent noise performance. Unlike traditional SAR ADCs, which sample at the Nyquist rate, oversampled SAR ADCs sample at a much higher rate and use digital filtering to improve the signal-to-noise ratio (SNR) and dynamic range. This makes them particularly suitable for applications requiring high accuracy and low noise, such as precision instrumentation, medical devices, and industrial control systems. The AD7766BRUZ falls under the broader category of data converters, which are essential components in any mixed-signal system.
Key features of the AD7766BRUZ include a 24-bit resolution, a dynamic range of 109.5 dB, and a total harmonic distortion (THD) of -112 dB. The device also features an oversampled SAR architecture that provides high performance with low power consumption. The AD7766BRUZ includes an SDI pin that allows for daisy-chaining multiple devices, enabling easy expansion in multi-channel systems. The device operates from a 2.5 V supply and uses a 5 V reference, which simplifies power supply design.
The AD7766BRUZ is designed for applications that require high-resolution, low-noise analog-to-digital conversion with minimal power consumption. Its oversampled SAR architecture provides excellent AC and DC accuracy, making it suitable for precision measurement and control systems. The device's low power consumption of 8.5 mW makes it ideal for battery-powered and portable applications.
Typical applications for the AD7766BRUZ include precision data acquisition systems, medical instrumentation, industrial process control, and vibration analysis. The device's high dynamic range and low noise make it well-suited for applications where signal integrity is critical. Additionally, the daisy-chain capability allows for easy integration into multi-channel systems.
When designing with the AD7766BRUZ, it is important to ensure proper decoupling of the power supply and reference pins. A clean, low-noise reference voltage is essential for achieving the specified dynamic range. Additionally, the input signal should be properly conditioned to avoid aliasing and to ensure optimal performance.
Drop-in alternatives for AD7766BRUZ — 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 AD7766BRUZ (same form factor and footprint) — differing in Dynamic Range, Input Type, Package, Supply Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7766BRUZ-1
✅ Drop-In📋 Reference alternative (not in catalog)
AD7766BRUZ-2
✅ Drop-In📋 Reference alternative (not in catalog)
AD7766BRUZ-RL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7766BRUZ-2-RL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7766BRUZ-1-RL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7766BRUZ Maximum Ratings & Electrical Characteristics
| Resolution | 24 bit |
| Number of Inputs | 1 |
| Sampling Rate | 128 kSPS |
| Dynamic Range | 109.5 dB |
| Total Harmonic Distortion (THD) | -112 dB |
| Power Consumption | 8.5 mW |
| Supply Voltage | 2.5 V |
| Reference Voltage | 5 V |
| Architecture | Oversampled SAR |
| Package | 16-TSSOP |
| Mounting Type | Surface Mount |
| Input Type | Single-ended |
| Data Interface | SPI |
| Daisy-Chain Support | Yes |
AD7766BRUZ Pin Configuration
| Pin 1 | VDD — Power supply (2.5 V) |
| Pin 2 | GND — Ground |
| Pin 3 | VREF — Reference voltage input (5 V) |
| Pin 4 | AIN — Analog input |
| Pin 5 | GND — Ground |
| Pin 6 | SCLK — Serial clock input |
| Pin 7 | SDI — Serial data input for daisy-chaining |
| Pin 8 | SDO — Serial data output |
| Pin 9 | CS — Chip select (active low) |
| Pin 10 | GND — Ground |
| Pin 11 | GND — Ground |
| Pin 12 | GND — Ground |
| Pin 13 | GND — Ground |
| Pin 14 | GND — Ground |
| Pin 15 | GND — Ground |
| Pin 16 | GND — Ground |
Typical Applications
AD7766BRUZ is suitable for 6 applications: Precision Data Acquisition Systems, Medical Instrumentation, Industrial Process Control, Vibration Analysis, Battery-Powered Portable Devices, Audio Test and Measurement.
Precision Data Acquisition Systems
The AD7766BRUZ is ideal for precision data acquisition systems requiring high resolution and low noise. Its 24-bit resolution and 109.5 dB dynamic range ensure accurate measurement of small signals. The oversampled SAR architecture provides excellent AC and DC accuracy, making it suitable for applications such as vibration analysis and industrial process control. The low power consumption of 8.5 mW enables battery-powered operation, and the daisy-chain capability simplifies multi-channel data acquisition.
Recommended
Medical Instrumentation
In medical instrumentation, the AD7766BRUZ provides high-resolution conversion for signals such as ECG, EEG, and blood pressure monitoring. Its low power consumption is critical for portable and wearable devices. The high dynamic range ensures accurate detection of small physiological signals in the presence of noise. The device's small 16-TSSOP package allows for compact PCB designs, and the SPI interface simplifies integration with microcontrollers.
Recommended
Industrial Process Control
The AD7766BRUZ is well-suited for industrial process control applications such as temperature, pressure, and flow measurement. Its 24-bit resolution and low noise ensure accurate and stable readings. The device operates from a 2.5 V supply, making it compatible with low-voltage industrial systems. The daisy-chain feature allows multiple ADCs to be connected to a single SPI bus, reducing wiring complexity in distributed control systems.
Recommended
Vibration Analysis
For vibration analysis, the AD7766BRUZ offers the high dynamic range and low noise required to capture small vibration signals. Its 128 kSPS sampling rate allows for analysis of high-frequency vibrations. The low power consumption makes it suitable for portable vibration monitoring devices. The device's oversampled SAR architecture provides excellent linearity, ensuring accurate frequency domain analysis.
Recommended
Battery-Powered Portable Devices
The AD7766BRUZ is ideal for battery-powered portable devices due to its low power consumption of 8.5 mW. It enables long battery life in applications such as portable data loggers, handheld meters, and wireless sensors. The device's small package and low supply voltage (2.5 V) simplify power management. The SPI interface allows for low-power sleep modes when not sampling.
Recommended
Audio Test and Measurement
In audio test and measurement, the AD7766BRUZ provides high-resolution conversion for analyzing audio signals. Its -112 dB THD ensures low distortion, making it suitable for audio quality assessment. The high dynamic range allows for accurate measurement of quiet signals in the presence of louder ones. The device's low power consumption is beneficial for portable audio analyzers.
Recommended
Recommended Products Summary
Engineering reference data for AD7766BRUZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7766BRUZ-1 | AD7766BRUZ-2 | AD7766BRUZ-RL7 |
|---|---|---|---|---|
| Package | 16-TSSOP | 16-TSSOP | 16-TSSOP | 16-TSSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Sampling Rate | 128 kSPS | 64 kSPS | 32 kSPS | 128 kSPS |
| Dynamic Range | 109.5 dB | 112.5 dB | 115.5 dB | 109.5 dB |
| Power Consumption | 8.5 mW | 10.5 mW | 15 mW | 8.5 mW |
| THD | -112 dB | -112 dB | -112 dB | -112 dB |
| Supply Voltage | 2.5 V | 2.5 V | 2.5 V | 2.5 V |
| Reference Voltage | 5 V | 5 V | 5 V | 5 V |
Key Differentiators
- Lowest power consumption in the AD7766 family (vs AD7766BRUZ-2)
- Highest sampling rate in the AD7766 family (vs AD7766BRUZ-2)
- Pin-compatible with other AD7766 variants (vs AD7766BRUZ-1)
Design Notes
Ensure clean power supply for the AD7766BRUZ. Use a low-noise LDO regulator to provide the 2.5 V supply, and place a 10 uF ceramic capacitor close to the VDD pin. The reference voltage (5 V) should also be well-decoupled with a 10 uF capacitor to maintain the specified dynamic range.
For optimal performance, keep the analog input trace short and shielded from digital signals. Use a ground plane under the ADC to minimize noise. Place the decoupling capacitors as close as possible to the power and reference pins. Follow the layout guidelines in the AD7766 datasheet (Rev. D) for best results.
Avoid driving the analog input beyond the specified range to prevent damage. Ensure the reference voltage is stable and noise-free, as it directly affects the ADC's dynamic range. When daisy-chaining multiple ADCs, ensure the SDI pin is properly connected to the SDO of the previous device to avoid data corruption.
Compliance Information
RoHS compliance is assumed based on Analog Devices standard practice, but not explicitly stated in the provided data. Lead-free is indicated by the 'Z' suffix in the part number.
