Overview
The ADS8668IDBT is a high-performance, 8-channel, 12-bit successive approximation (SAR) analog-to-digital converter (ADC) produced by Texas Instruments. This integrated data acquisition system is designed to operate at a throughput of 500 kSPS and features an integrated analog front-end circuitry for each input channel. The device supports both bipolar and unipolar input ranges, making it versatile for various industrial and automotive applications. It operates on a single 5-V analog supply and has a digital supply range of 1.65 V to 5.25 V, facilitating easy integration with a wide range of host controllers.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Channels | 8 |
| Resolution | 12-bit |
| Throughput | 500 kSPS |
| Analog Supply Voltage | 5 V |
| Digital Supply Voltage | 1.65 V to 5.25 V |
| Input Ranges | ±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, ±0.64 V; 0 V to 10.24 V, 0 V to 5.12 V, 0 V to 2.56 V, 0 V to 1.28 V |
| Input Impedance | 1 MΩ |
| Input Overvoltage Protection | Up to ±20 V |
| Reference Voltage | On-chip, 4.096 V with low drift |
| DNL/INL | ±0.2 LSB |
| SNR/THD | 73.8 dB / -95 dB |
| Power Consumption | 65 mW |
| Operating Temperature Range | -40°C to 125°C |
| Package Type | TSSOP-38 |
| Package Dimensions | 9.7 mm × 4.4 mm |
Key Features
- 12-bit SAR ADC with integrated analog front-end circuitry for each input channel
- 4- or 8-channel multiplexer with automatic and manual scanning modes
- Channel-independent programmable inputs with various bipolar and unipolar ranges
- Constant resistive input impedance of 1 MΩ
- Input overvoltage protection up to ±20 V
- On-chip, 4.096-V reference with low temperature drift
- Excellent performance metrics: DNL ±0.2 LSB, INL ±0.2 LSB, SNR 73.8 dB, THD -95 dB
- Low power consumption of 65 mW
- AUX input for direct connection to ADC inputs
- ALARM feature with high and low thresholds per channel
- SPI-compatible interface with daisy-chain capability
Applications
The ADS8668IDBT is suitable for a variety of applications, including industrial automation, automotive systems, medical devices, and test and measurement equipment. Its high accuracy, low power consumption, and robust input protection make it an ideal choice for environments requiring precise and reliable data acquisition.
Q & A
- What is the resolution of the ADS8668IDBT ADC?
The ADS8668IDBT has a resolution of 12 bits. - What is the maximum throughput of the ADS8668IDBT?
The maximum throughput is 500 kSPS. - What are the supported input ranges for the ADS8668IDBT?
The device supports both bipolar (±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, ±0.64 V) and unipolar (0 V to 10.24 V, 0 V to 5.12 V, 0 V to 2.56 V, 0 V to 1.28 V) input ranges. - What is the input impedance of the ADS8668IDBT?
The input impedance is 1 MΩ. - Does the ADS8668IDBT have overvoltage protection?
Yes, it has input overvoltage protection up to ±20 V. - What is the reference voltage of the ADS8668IDBT?
The device has an on-chip, 4.096-V reference with low temperature drift. - How much power does the ADS8668IDBT consume?
The power consumption is 65 mW. - What is the operating temperature range of the ADS8668IDBT?
The operating temperature range is -40°C to 125°C. - What type of interface does the ADS8668IDBT use?
The device uses a SPI-compatible interface with daisy-chain capability. - What package type is the ADS8668IDBT available in?
The device is available in a TSSOP-38 package.
