Overview
The AD7768-4BSTZ-RL is a 4-channel, 24-bit, simultaneous sampling, sigma-delta (Σ-Δ) analog-to-digital converter (ADC) produced by Analog Devices Inc. This device is designed for high-precision measurements, offering excellent performance in both AC and DC signal sampling. The AD7768-4 features a Σ-Δ modulator and digital filter per channel, enabling synchronized sampling of AC and DC signals. It achieves a dynamic range of 108 dB at a maximum input bandwidth of 110.8 kHz, with typical performance metrics including ±2 ppm integral nonlinearity (INL), ±50 μV offset error, and ±30 ppm gain error.
Key Specifications
| Specification | Value |
|---|---|
| Number of Channels | 4 |
| Resolution | 24-bit |
| Sampling Mode | Simultaneous Sampling |
| Maximum Output Data Rate | 256 kSPS (Fast Mode), 128 kSPS (Median Mode), 32 kSPS (Low Power Mode) |
| Input Bandwidth | 110.8 kHz (Fast Mode), 55.4 kHz (Median Mode), 13.8 kHz (Low Power Mode) |
| Dynamic Range | 108 dB |
| Integral Nonlinearity (INL) | ±2 ppm |
| Offset Error | ±50 μV |
| Gain Error | ±30 ppm |
| Power Modes | Fast Mode (51.5 mW per channel), Median Mode (27.5 mW per channel), Low Power Mode (9.375 mW per channel) |
| Operating Temperature | −40°C to +105°C |
| Package Type | 64-Lead LQFP (10 mm × 10 mm) |
Key Features
- Precision AC and DC Performance: The AD7768-4 offers high precision in both AC and DC signal measurements.
- Simultaneous Sampling: All channels sample simultaneously, ensuring synchronized data acquisition.
- Power Scaling: Three power modes (Fast, Median, Low Power) allow users to trade off input bandwidth, output data rate, and power dissipation.
- Extensive Digital Filtering: Includes wideband and sinc5 filters with various decimation rates to optimize noise performance.
- Embedded Analog Functionality: Each channel features a precharge buffer and reference precharge buffer to reduce input current and glitches.
- Flexible Configuration: Supports various filter configurations and operational amplifier settings.
Applications
- High-Performance Measurement Modules: Suitable for high-performance AC and low-power DC measurement applications.
- Industrial Automation: Used in precision measurement and control systems in industrial environments.
- Medical Devices: Applicable in medical equipment requiring high-precision signal conversion.
- Aerospace and Defense: Employed in various aerospace and defense applications where precise signal measurement is critical.
Q & A
- What is the resolution of the AD7768-4 ADC?
The AD7768-4 has a resolution of 24 bits.
- How many channels does the AD7768-4 have?
The AD7768-4 has 4 channels.
- What are the maximum output data rates for the different power modes?
The maximum output data rates are 256 kSPS (Fast Mode), 128 kSPS (Median Mode), and 32 kSPS (Low Power Mode).
- What is the dynamic range of the AD7768-4?
The dynamic range is 108 dB.
- What are the typical values for integral nonlinearity (INL), offset error, and gain error?
The typical values are ±2 ppm for INL, ±50 μV for offset error, and ±30 ppm for gain error.
- How does the power consumption vary across the different power modes?
The power consumption is 51.5 mW per channel in Fast Mode, 27.5 mW per channel in Median Mode, and 9.375 mW per channel in Low Power Mode.
- What types of digital filters are available on the AD7768-4?
The device offers wideband and sinc5 filters with various decimation rates.
- What is the operating temperature range of the AD7768-4?
The operating temperature range is −40°C to +105°C.
- What package type is the AD7768-4 available in?
The AD7768-4 is available in a 64-Lead LQFP (10 mm × 10 mm) package.
- Can the AD7768-4 be used in high-performance AC measurement applications?
Yes, the AD7768-4 is suitable for high-performance AC measurement applications due to its high precision and simultaneous sampling capabilities.
