Overview
The AD7768BSTZ-RL, produced by Analog Devices Inc., is an 8-channel or 4-channel 24-bit, simultaneous sampling, sigma-delta (Σ-Δ) analog-to-digital converter (ADC). This device is designed for high precision ac and dc measurements, offering a maximum input bandwidth of 110.8 kHz and a dynamic range of 108 dB. The AD7768/AD7768-4 series allows users to trade off input bandwidth, output data rate, and power dissipation by selecting from three power modes: fast, median, and low power modes. This flexibility makes the AD7768/AD7768-4 suitable for both low power dc and high performance ac measurement applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Channels | 8 or 4 | - |
| Resolution | 24-bit | - |
| Maximum Input Bandwidth | 110.8 kHz | kHz |
| Dynamic Range | 108 dB | dB |
| Integral Nonlinearity (INL) | ±2 ppm | ppm |
| Offset Error | ±50 μV | μV |
| Gain Error | ±30 ppm | ppm |
| Power Modes | Fast, Median, Low Power | - |
| Fast Mode | 256 kSPS, 110.8 kHz, 51.5 mW/channel | kSPS, kHz, mW |
| Median Mode | 128 kSPS, 55.4 kHz, 27.5 mW/channel | kSPS, kHz, mW |
| Low Power Mode | 32 kSPS, 13.8 kHz, 9.375 mW/channel | kSPS, kHz, mW |
| Package | 64-Lead LQFP (10 mm × 10 mm) | - |
| Operating Temperature | −40°C to +105°C | °C |
Key Features
- Precision ac and dc performance: High accuracy with ±2 ppm integral nonlinearity (INL), ±50 μV offset error, and ±30 ppm gain error.
- Simultaneous Sampling: 8-channel or 4-channel simultaneous sampling capability.
- Power Scaling: Three power modes (fast, median, low power) to optimize for noise targets and power consumption.
- Extensive Digital Filtering: Wideband linear phase filter and sinc5 filter options with low pass-band ripple and sharp roll-off.
- Embedded Analog Functionality: Precharge buffers on each analog input and reference precharge buffers per channel to reduce input current and glitches.
- Flexible Filter Options: Filters can be selected and run on a per channel basis, with decimation rates of ×32, ×64, ×128, ×256, ×512, and ×1024.
Applications
- High Performance AC Measurements: Suitable for applications requiring high accuracy and bandwidth, such as audio, medical, and industrial instrumentation.
- Low Power DC Measurements: Ideal for battery-powered devices and other low power applications where precision dc measurements are necessary.
- Frequency Domain Measurements: The wideband linear phase filter makes it suitable for frequency domain measurements.
- Industrial Automation: Can be used in various industrial automation applications requiring precise analog-to-digital conversion.
Q & A
- What is the maximum input bandwidth of the AD7768/AD7768-4?
The maximum input bandwidth is 110.8 kHz.
- How many channels does the AD7768/AD7768-4 support?
The device supports either 8 channels or 4 channels.
- What are the power modes available for the AD7768/AD7768-4?
The device has three power modes: fast, median, and low power modes.
- What is the dynamic range of the AD7768/AD7768-4?
The dynamic range is 108 dB.
- What type of filters does the AD7768/AD7768-4 offer?
The device offers wideband linear phase filters and sinc5 filters.
- What is the resolution of the AD7768/AD7768-4?
The resolution is 24 bits.
- What is the operating temperature range of the AD7768/AD7768-4?
The operating temperature range is −40°C to +105°C.
- What package type is the AD7768BSTZ-RL available in?
The device is available in a 64-Lead LQFP (10 mm × 10 mm) package.
- Can the filters be configured on a per channel basis?
Yes, the filters can be selected and run on a per channel basis.
- What are the typical power consumptions for each power mode?
Fast mode: 51.5 mW/channel, Median mode: 27.5 mW/channel, Low power mode: 9.375 mW/channel.
