Overview
The ADS8678IDBT from Texas Instruments is a 14-bit, 8-channel successive approximation (SAR) analog-to-digital converter (ADC) integrated into a comprehensive data acquisition system. This device operates at a throughput of 500 kSPS and features an integrated analog front-end for each input channel, including overvoltage protection up to ±20 V. It supports both bipolar and unipolar input ranges and includes an on-chip 4.096-V reference with low temperature drift. The ADS8678IDBT is designed for high precision and reliability, making it suitable for various industrial and automotive applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 14 | Bits |
| Number of Channels | 8 | - |
| Throughput | 500 | kSPS |
| Analog Supply Voltage | 4.75 to 5.25 | V |
| Digital Supply Voltage | 1.65 to 5.25 | V |
| Input Ranges (Bipolar) | ±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, ±0.64 V | V |
| Input Ranges (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 | V |
| Input Impedance | 1 MΩ | - |
| Overvoltage Protection | Up to ±20 V | V |
| Reference Voltage | 4.096 V | V |
| DNL | ±0.2 LSB | - |
| INL | ±0.25 LSB | - |
| SNR | 85 dB | - |
| THD | –100 dB | - |
| Power Consumption | 65 mW | - |
| Operating Temperature Range | –40°C to 125°C | °C |
| Package | TSSOP-38 | - |
Key Features
- 14-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: 500-kSPS aggregate throughput, DNL: ±0.2 LSB, INL: ±0.25 LSB, SNR: 85 dB, THD: –100 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.
- Industrial temperature range: –40°C to 125°C.
- TSSOP-38 package (9.7 mm × 4.4 mm).
Applications
- Power automation systems.
- Protection relays.
- PLC (Programmable Logic Controller) analog input modules.
- Industrial control systems.
- Automotive and aerospace applications requiring high precision and reliability.
- Medical devices and diagnostic equipment.
- Test and measurement instruments.
Q & A
- What is the resolution of the ADS8678IDBT ADC?
The ADS8678IDBT has a resolution of 14 bits.
- How many channels does the ADS8678IDBT support?
The ADS8678IDBT supports 8 channels.
- What is the throughput of the ADS8678IDBT?
The throughput of the ADS8678IDBT is 500 kSPS.
- What are the input voltage ranges supported by the ADS8678IDBT?
The device supports both bipolar and unipolar input ranges: ±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, ±0.64 V, and 0 V to 10.24 V, 0 V to 5.12 V, 0 V to 2.56 V, 0 V to 1.28 V.
- What is the input impedance of the ADS8678IDBT?
The input impedance is 1 MΩ.
- Does the ADS8678IDBT have overvoltage protection?
Yes, it has overvoltage protection up to ±20 V.
- What is the reference voltage of the ADS8678IDBT?
The on-chip reference voltage is 4.096 V.
- What is the power consumption of the ADS8678IDBT?
The power consumption is 65 mW.
- What is the operating temperature range of the ADS8678IDBT?
The operating temperature range is –40°C to 125°C.
- What package type does the ADS8678IDBT come in?
The ADS8678IDBT comes in a TSSOP-38 package.
