Overview
The ADS8688IDBTR is a high-performance, 16-bit successive approximation (SAR) analog-to-digital converter (ADC) produced by Texas Instruments. This device is part of the ADS868x series, which includes integrated data acquisition systems with advanced features for various industrial and automotive applications. The ADS8688 specifically offers an 8-channel configuration, making it suitable for multi-channel data acquisition needs.
Operating on a single 5-V analog supply, the ADS8688 supports a wide range of input voltages, including bipolar and unipolar configurations. It features an integrated analog front-end with overvoltage protection, a multiplexer with automatic and manual scanning modes, and an on-chip reference with low temperature drift. The device is designed for high precision and reliability, making it an excellent choice for demanding applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 16 | Bits |
| Number of Channels | 8 | - |
| Sample Rate | 500 | kSPS |
| Analog Supply Voltage | 5 | V |
| Digital Supply Voltage | 1.65 to 5.25 | V |
| Input Ranges (Bipolar) | ±10.24 V, ±5.12 V, ±2.56 V | V |
| Input Ranges (Unipolar) | 0 to 10.24 V, 0 to 5.12 V | V |
| Input Impedance | 1 MΩ | - |
| Overvoltage Protection | Up to ±20 V | V |
| On-Chip Reference Voltage | 4.096 | V |
| DNL | ±0.5 LSB | - |
| INL | ±0.75 LSB | - |
| SNR | 92 dB | - |
| THD | –102 dB | - |
| Power Consumption | 65 mW | - |
| Operating Temperature Range | –40°C to 125°C | °C |
| Package Type | TSSOP-38 | - |
Key Features
- 16-Bit ADC with Integrated Analog Front-End: High-resolution conversion with integrated analog front-end circuitry for each input channel.
- 4-, 8-Channel MUX with Auto and Manual Scan: Flexible multiplexing options for automatic and manual scanning of input channels.
- Channel-Independent Programmable Input Ranges: Software-programmable input ranges for each channel, including bipolar and unipolar configurations.
- Constant Resistive Input Impedance: 1 MΩ input impedance across all input ranges.
- Input Overvoltage Protection: Protection up to ±20 V for robust operation.
- On-Chip, 4.096-V Reference with Low Drift: High stability and low temperature drift of the on-chip reference voltage.
- Excellent Performance Metrics: High SNR (92 dB), low THD (–102 dB), and precise DNL and INL specifications.
- Low Power Consumption: 65 mW power consumption for energy-efficient operation.
- SPI™-Compatible Interface with Daisy-Chain Capability: Easy integration with digital hosts and support for daisy-chaining multiple devices.
- Industrial Temperature Range: Operation from –40°C to 125°C, suitable for harsh environments.
Applications
- Power Automation: Used in power monitoring and control systems.
- Protection Relays: Employed in protection relay systems for electrical grids.
- PLC Analog Input Modules: Integrated into Programmable Logic Controllers (PLCs) for industrial automation.
- Industrial Data Acquisition Systems: Suitable for various industrial data acquisition and monitoring applications.
- Automotive Systems: Used in automotive applications requiring high precision and reliability.
Q & A
- What is the resolution of the ADS8688 ADC?
The ADS8688 has a resolution of 16 bits.
- How many input channels does the ADS8688 support?
The ADS8688 supports 8 input channels.
- What is the sample rate of the ADS8688?
The sample rate of the ADS8688 is 500 kSPS.
- What are the supported input voltage ranges for the ADS8688?
The ADS8688 supports bipolar input ranges of ±10.24 V, ±5.12 V, and ±2.56 V, as well as unipolar ranges of 0 to 10.24 V and 0 to 5.12 V.
- Does the ADS8688 have overvoltage protection?
Yes, the ADS8688 has input overvoltage protection up to ±20 V.
- What is the operating temperature range of the ADS8688?
The operating temperature range of the ADS8688 is from –40°C to 125°C.
- What type of interface does the ADS8688 use for communication?
The ADS8688 uses a SPI™-compatible interface and supports daisy-chaining of multiple devices.
- How much power does the ADS8688 consume?
The ADS8688 consumes approximately 65 mW of power.
- What is the package type of the ADS8688?
The ADS8688 comes in a TSSOP-38 package.
- Is the ADS8688 suitable for industrial applications?
Yes, the ADS8688 is designed for industrial applications and operates within an industrial temperature range.
