Overview
The ADS8321E/250 is a 16-bit, high-speed, micropower sampling analog-to-digital converter (ADC) produced by Texas Instruments. This device is designed for low power consumption and high performance, making it ideal for portable and battery-operated systems. The ADS8321E operates over a supply range of 4.75V to 5.25V and features a synchronous serial (SPI/SSI compatible) interface and a differential input. The external reference voltage can be set to any level within the range of 500mV to VCC/2, allowing for flexible analog input range settings.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Resolution | 16 | Bits | ||
| Analog Input Full-Scale Input Span | VREF | V | ||
| Absolute Input Range (+In) | -0.1 VCC + 0.1 | 4.0 | V | |
| Absolute Input Range (-In) | -0.1 | 4.0 | V | |
| Input Capacitance | 25 | pF | ||
| Leakage Current | 1 | nA | ||
| Integral Linearity Error | ±0.008 | ±0.018 | ±0.012 | % of FSR |
| Offset Error | ±0.4 | ±2 | ±0.2 | mV |
| Gain Error, Positive | ±0.05 | ±0.024 | % | |
| Gain Error, Negative | ±0.05 | ±0.024 | % | |
| Conversion Time | 16 | Clk Cycles | ||
| Throughput Rate | 100 | kHz | ||
| Clock Frequency Range | 0.024 | 2.9 | MHz | |
| Power Supply Range | 4.75 | 5.25 | V | |
| Quiescent Current | 1100 | 1700 | µA | |
| Power Dissipation | 5.5 | 8.5 | mW | |
| Operating Temperature Range | -40 | 85 | °C |
Key Features
- High-Speed Conversion: The ADS8321E can perform up to 100,000 conversions per second.
- Low Power Consumption: The device operates with very low power dissipation, especially at lower data rates, with an average power consumption of less than 1mW at a 10kHz data rate.
- Differential Input: The ADC features a differential analog input, allowing for both single-ended and differential input configurations.
- Flexible Reference Voltage: The external reference voltage can be set between 500mV and VCC/2, providing flexibility in setting the analog input range.
- Synchronous Serial Interface: The device uses a SPI/SSI compatible interface for data transfer.
- Small Package: Available in an MSOP-8 package, making it suitable for space-constrained applications.
- Power-Down Mode: The device enters power-down mode when CS is HIGH or when the conversion is complete, further reducing power consumption.
Applications
- Portable and Battery-Operated Systems: Ideal due to its ultra-low power consumption.
- Remote Data Acquisition Modules: Suitable for remote sensing and data collection applications.
- Simultaneous Multi-Channel Systems: Can be used in systems requiring multiple channels of data acquisition.
- Isolated Data Acquisition: Applicable in isolated data acquisition systems where low power and high accuracy are required.
Q & A
- What is the resolution of the ADS8321E ADC?
The ADS8321E has a resolution of 16 bits.
- What is the operating supply voltage range for the ADS8321E?
The device operates over a supply range of 4.75V to 5.25V.
- What is the maximum throughput rate of the ADS8321E?
The maximum throughput rate is 100 kHz.
- What type of interface does the ADS8321E use for data transfer?
The device uses a synchronous serial (SPI/SSI compatible) interface.
- How does the ADS8321E reduce power consumption?
The device reduces power consumption by entering power-down mode when CS is HIGH or when the conversion is complete, and by spending most of its time in power-down mode at lower data rates.
- What is the range for the external reference voltage?
The external reference voltage can be set between 500mV and VCC/2.
- What are the typical applications for the ADS8321E?
Typical applications include portable and battery-operated systems, remote data acquisition modules, simultaneous multi-channel systems, and isolated data acquisition.
- What is the package type for the ADS8321E?
The device is available in an MSOP-8 package.
- How does the ADS8321E handle analog input configurations?
The device can handle both single-ended and differential analog input configurations.
- What is the effect of averaging conversion results on noise?
Averaging conversion results reduces transition noise by a factor of 1/√n, where n is the number of averages.
