Overview
The ADS8684IDBT, produced by Texas Instruments, is a 16-bit successive approximation (SAR) analog-to-digital converter (ADC) integrated into a 4-channel data acquisition system. This device operates at a throughput of 500 kSPS and features an integrated analog front-end for each input channel, providing 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 ADS8684IDBT is designed for high precision and reliability, making it suitable for various industrial and automotive applications.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Resolution | Number of bits | 16 bits |
| Channels | Number of input channels | 4 (single-ended) |
| Sample Rate | Throughput | 500 kSPS |
| Input Ranges | Bipolar and unipolar ranges | Bipolar: ±10.24 V, ±5.12 V, ±2.56 V; Unipolar: 0 V to 10.24 V, 0 V to 5.12 V |
| Analog Supply | Voltage range | 5 V (1.65 V to 5 V I/O supply) |
| Input Impedance | Constant resistive input impedance | 1 MΩ |
| Overvoltage Protection | Maximum input voltage | Up to ±20 V |
| Reference Voltage | On-chip reference voltage | 4.096 V with low drift |
| DNL and INL | Differential and integral nonlinearity | DNL: ±0.5 LSB; INL: ±0.75 LSB |
| SNR and THD | Signal-to-noise ratio and total harmonic distortion | SNR: 92 dB; THD: –102 dB |
| Power Consumption | Power consumption at 500 kSPS | 65 mW |
| Interface | Serial interface compatibility | SPI™-compatible with daisy-chain support |
| Operating Temperature | Industrial temperature range | –40°C to 125°C |
| Package | Package type and size | TSSOP-38 (9.7 mm × 4.4 mm) |
Key Features
- Integrated Analog Front-End: Each input channel features integrated analog front-end circuitry with overvoltage protection up to ±20 V.
- Programmable Input Ranges: Channel-independent programmable input ranges for both bipolar (±10.24 V, ±5.12 V, ±2.56 V) and unipolar (0 V to 10.24 V, 0 V to 5.12 V) inputs.
- Constant Input Impedance: 1 MΩ constant resistive input impedance irrespective of the selected input range.
- On-Chip Reference: 4.096-V reference with low temperature drift.
- High Performance: 500-kSPS aggregate throughput, DNL: ±0.5 LSB, INL: ±0.75 LSB, SNR: 92 dB, and THD: –102 dB.
- Low Power Consumption: 65 mW at 500 kSPS.
- SPI-Compatible Interface: Supports daisy-chaining of multiple devices with a digital supply range of 1.65 V to 5.25 V.
- Industrial Temperature Range: Operates from –40°C to 125°C.
Applications
- Power Automation: Suitable for monitoring and control in power distribution systems.
- Protection Relays: Used in protective relay systems for accurate measurement and protection.
- PLC Analog Input Modules: Ideal for programmable logic controllers requiring high-precision analog inputs.
- Industrial Automation: Applicable in various industrial automation systems requiring precise analog-to-digital conversion.
- Automotive Systems: Used in automotive applications that demand high reliability and precision.
Q & A
- What is the resolution of the ADS8684IDBT ADC?
The ADS8684IDBT has a resolution of 16 bits.
- How many input channels does the ADS8684IDBT support?
The ADS8684IDBT supports 4 single-ended input channels.
- What are the available input ranges for the ADS8684IDBT?
The device supports bipolar input ranges of ±10.24 V, ±5.12 V, and ±2.56 V, as well as unipolar ranges of 0 V to 10.24 V and 0 V to 5.12 V.
- What is the maximum overvoltage protection for the ADS8684IDBT?
The device offers overvoltage protection up to ±20 V.
- What is the on-chip reference voltage of the ADS8684IDBT?
The on-chip reference voltage is 4.096 V with low temperature drift.
- What is the sample rate of the ADS8684IDBT?
The sample rate is 500 kSPS.
- What is the power consumption of the ADS8684IDBT at 500 kSPS?
The power consumption is 65 mW at 500 kSPS.
- Does the ADS8684IDBT support daisy-chaining?
Yes, the device supports daisy-chaining of multiple devices through an SPI-compatible interface.
- What is the operating temperature range of the ADS8684IDBT?
The device operates from –40°C to 125°C.
- What is the package type and size of the ADS8684IDBT?
The device is packaged in a TSSOP-38 package with dimensions of 9.7 mm × 4.4 mm.
