Overview
The AD7768-4BSTZ 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 ac and dc measurements, offering a dynamic range of 108 dB and a maximum input bandwidth of 110.8 kHz. It features a Σ-Δ modulator and digital filter per channel, enabling synchronized sampling of both ac and dc signals. The AD7768-4 is highly versatile, allowing users to trade off input bandwidth, output data rate, and power dissipation across three power modes: fast, median, and low power modes.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Channels | 4 |
| Number of Bits | 24 |
| Sampling Rate (Maximum) | 256 kSPS |
| Input Bandwidth (Maximum) | 110.8 kHz |
| Dynamic Range | 108 dB |
| Integral Nonlinearity (INL) | ±2 ppm |
| Offset Error | ±50 μV |
| Gain Error | ±30 ppm |
| Power Modes | Fast, Median, Low Power |
| Power Consumption (Fast Mode per Channel) | 51.5 mW |
| Power Consumption (Median Mode per Channel) | 27.5 mW |
| Power Consumption (Low Power Mode per Channel) | 9.375 mW |
| Package Type | 64-Lead LQFP (10mm x 10mm) |
| Operating Temperature | -40°C to +105°C |
| Supply Voltage (Analog) | 2V to 5.5V |
| Data Interface | SPI |
| Input Type | Differential |
Key Features
- Simultaneous Sampling: Enables synchronized sampling of ac and dc signals across all channels.
- Power Scaling: Three power modes (fast, median, low power) to optimize for noise targets and power consumption.
- High Precision: Achieves 108 dB dynamic range, ±2 ppm integral nonlinearity (INL), ±50 μV offset error, and ±30 ppm gain error.
- Flexible Digital Filtering: Offers wideband and low pass-band ripple filters, and antialiasing filters.
- Configurable ADC Driver: Can be configured as Sallen-Key or multiple feedback filters, or as inverting and noninverting operational amplifiers.
- Optimized Design: Optimized power and ground planes for low noise and high-speed operation.
Applications
- High Performance AC and DC Measurements: Suitable for applications requiring precise measurement of both ac and dc signals.
- Low Power DC Measurements: Ideal for battery-powered devices and other low power applications.
- Industrial Automation: Used in industrial control systems, sensors, and data acquisition systems.
- Medical Devices: Applicable in medical equipment requiring high precision and low noise.
- Aerospace and Defense: Used in various aerospace and defense applications where high accuracy and reliability are crucial.
Q & A
- What is the maximum sampling rate of the AD7768-4?
The maximum sampling rate of the AD7768-4 is 256 kSPS per channel.
- What is the dynamic range of the AD7768-4?
The dynamic range of the AD7768-4 is 108 dB.
- How many power modes does the AD7768-4 have?
The AD7768-4 has three power modes: fast, median, and low power.
- What is the package type of the AD7768-4?
The AD7768-4 comes in a 64-Lead LQFP (10mm x 10mm) package.
- What is the operating temperature range of the AD7768-4?
The operating temperature range is -40°C to +105°C.
- What type of data interface does the AD7768-4 use?
The AD7768-4 uses an SPI data interface.
- Can the AD7768-4 be used for both ac and dc measurements?
- How many channels does the AD7768-4 have?
The AD7768-4 has 4 channels.
- What is the input type of the AD7768-4?
The input type is differential.
- Is the AD7768-4 suitable for low power applications?
