Overview
The ADS8638SRGET, produced by Texas Instruments, is a 12-bit analog-to-digital converter (ADC) designed for demanding industrial measurement applications. This device utilizes a successive approximation register (SAR) core and features a sample-and-hold front-end with no latent conversions, allowing for high-speed conversions up to 1 MSPS. The ADS8638 is part of the ADS8634/8 family, which includes an input multiplexer for measuring up to eight inputs, an internal temperature sensor, an internal voltage reference, and digital comparators for setting alarm thresholds on each input. This integration minimizes the need for external components, making it a highly integrated and efficient solution.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 12 bits | |
| Input Range | ±10V, ±5V, ±2.5V, 0V to 10V, 0V to 5V (up to ±12V with external reference) | V |
| Sampling Rate | Up to 1 MSPS | |
| Integral Non-Linearity (INL) | ±0.9 LSB | |
| Signal-to-Noise Ratio (SNR) | 71.8 dB | dB |
| Power Consumption at 1 MSPS | 14.45 mW | mW |
| Power Consumption at 0.1 MSPS | 5.85 mW | mW |
| Operating Temperature Range | –40°C to +125°C | °C |
| Package Type | VQFN-24 | |
| Package Size | 4mm × 4mm | mm |
Key Features
- Selectable Input Range: ±10V, ±5V, ±2.5V, 0V to 10V, or 0V to 5V, with up to ±12V possible using an external reference.
- No Latent Conversions: Up to 1 MSPS without latency in conversions.
- Outstanding Performance: 12 bits with no missing codes, INL of ±0.9 LSB, and SNR of 71.8 dB.
- Highly Integrated: Includes a 4- or 8-channel input multiplexer, internal temperature sensor, internal voltage reference, and alarm thresholds for each channel.
- Low Power: 14.45 mW at 1 MSPS and 5.85 mW at 0.1 MSPS, with a flexible power-down mode.
- SPI-Compatible Serial Interface: For communication and control.
- Extended Temperature Range: –40°C to +125°C.
- Small Footprint: 4mm × 4mm QFN package.
Applications
- Industrial Process Controls (PLC): Suitable for monitoring and controlling industrial processes.
- Data Acquisition Systems: Ideal for high-speed data acquisition in various environments.
- High-Speed, Closed-Loop Systems: Used in systems requiring fast feedback loops.
- Digital Power Supplies: Can be integrated into digital power supply systems for precise monitoring and control.
Q & A
- What is the resolution of the ADS8638 ADC?
The ADS8638 has a resolution of 12 bits.
- What are the selectable input ranges for the ADS8638?
The ADS8638 offers selectable input ranges of ±10V, ±5V, ±2.5V, 0V to 10V, and 0V to 5V, with up to ±12V possible using an external reference.
- What is the maximum sampling rate of the ADS8638?
The maximum sampling rate of the ADS8638 is up to 1 MSPS.
- What is the power consumption of the ADS8638 at 1 MSPS?
The power consumption at 1 MSPS is 14.45 mW.
- What is the operating temperature range of the ADS8638?
The operating temperature range is –40°C to +125°C.
- What type of package does the ADS8638 come in?
The ADS8638 comes in a VQFN-24 package with a size of 4mm × 4mm.
- Does the ADS8638 have an internal temperature sensor?
Yes, the ADS8638 includes an internal temperature sensor.
- What kind of serial interface does the ADS8638 use?
The ADS8638 uses an SPI-compatible serial interface.
- What are some typical applications of the ADS8638?
The ADS8638 is typically used in industrial process controls, data acquisition systems, high-speed closed-loop systems, and digital power supplies.
- How does the ADS8638 manage power consumption?
The ADS8638 has a flexible power-down mode and consumes 14.45 mW at 1 MSPS and 5.85 mW at 0.1 MSPS.
