Overview
The ADS8321E, produced by Texas Instruments, is a 16-bit sampling analog-to-digital converter (ADC) known for its high speed and ultra-low power consumption. This device operates within a supply range of 4.75V to 5.25V and is designed for applications requiring high precision and low power dissipation. The ADS8321E features a synchronous serial (SPI/SSI compatible) interface and a differential input, making it suitable for a variety of applications including battery-operated systems, remote data acquisition, and simultaneous multi-channel systems.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Resolution | 16 | Bits | ||
| Sampling Rate | 100 | kHz | ||
| Power Consumption at 100kHz | 4.5 | mW | ||
| Power Consumption at 10kHz | 1 | mW | ||
| Power Down Current | 0.3 | 3 | µA | |
| Integral Linearity Error | ±0.008 | ±0.018 | % of FSR | |
| Offset Error | ±0.4 | ±2 | mV | |
| Gain Error | ±0.05 | % | ||
| Reference Voltage Range | 0.5V | VCC/2 | V | |
| Package | MSOP-8 |
Key Features
- High Speed and Low Power: The ADS8321E operates at up to 100kHz sampling rate while consuming less than 5.5mW from the power supply at full speed and less than 1mW at 10kHz.
- Differential Input: The device features a bipolar and fully differential analog input, allowing for both single-ended and differential input configurations.
- Serial Interface: It includes a synchronous serial (SPI/SSI compatible) interface for data transfer.
- External Reference: The reference voltage can be set to any level within the range of 500mV to VCC/2, directly setting the range of the analog input.
- Power Down Mode: The device enters power-down mode when CS is HIGH or when the conversion is complete, reducing power consumption to 3µA maximum.
- Compact Package: Available in an MSOP-8 package, making it ideal for space-constrained applications.
Applications
- Battery-Operated Systems: Ideal for portable and battery-operated systems due to its ultra-low power consumption.
- Remote Data Acquisition: Suitable for remote data acquisition modules where power efficiency is crucial.
- Simultaneous Multi-Channel Systems: Can be used in simultaneous multi-channel systems due to its high speed and low power characteristics.
- Isolated Data Acquisition: Appropriate for isolated data acquisition applications requiring high precision and low noise.
- Industrial Controls and Robotics: Used in industrial control systems and robotics where precise and efficient data conversion is necessary.
- Vibration Analysis: Suitable for vibration analysis applications requiring high-speed data acquisition.
Q & A
- What is the resolution of the ADS8321E ADC?
The ADS8321E has a resolution of 16 bits.
- What is the maximum sampling rate of the ADS8321E?
The maximum sampling rate is 100kHz.
- How much power does the ADS8321E consume at 100kHz sampling rate?
The power consumption at 100kHz is less than 5.5mW.
- What is the power consumption in power-down mode?
The power consumption in power-down mode is 3µA maximum.
- What type of interface does the ADS8321E use for data transfer?
The device uses a synchronous serial (SPI/SSI compatible) interface.
- What is the range for the external reference voltage?
The external reference voltage can be set to any level within the range of 500mV to VCC/2.
- What type of package is the ADS8321E available in?
The ADS8321E is available in an MSOP-8 package.
- What are some common applications for the ADS8321E?
Common applications include battery-operated systems, remote data acquisition, simultaneous multi-channel systems, isolated data acquisition, industrial controls, robotics, and vibration analysis.
- How does the ADS8321E handle noise and voltage variation in the reference input?
The ADS8321E does not inherently reject noise or voltage variation in the reference input. Any noise and ripple from the supply will appear directly in the digital results.
- What precautions should be taken regarding the analog input voltage?
The +In input should always remain within the range of GND – 300mV to VCC + 300mV, and the –In input should always remain within the range of GND – 300mV to 4V.
