Overview
The ADS8668IDBTR, produced by Texas Instruments, is an 8-channel, 12-bit successive approximation register (SAR) analog-to-digital converter (ADC). This integrated data acquisition system operates on a single 5-V analog supply and features a throughput of 500 kSPS. The device includes an integrated analog front-end for each input channel, providing overvoltage protection up to ±20 V and a constant resistive input impedance of 1 MΩ. It also includes an on-chip, 4.096-V reference with low temperature drift. The ADS8668 supports both bipolar and unipolar input ranges, making it versatile for various applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 12 | Bits |
| Number of Channels | 8 | - |
| Sample Rate | 500 | kSPS |
| Analog Supply Voltage | 4.75 - 5.25 | V |
| Digital Supply Voltage | 1.65 - 5.25 | V |
| Input Ranges | ±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, ±0.64 V | V |
| Conversion Time | 850 | ns |
| DNL (Differential Nonlinearity) | ±0.2 | LSB |
| INL (Integral Nonlinearity) | ±0.2 | LSB |
| Gain Error | ±0.1 %FSR | - |
| Operating Temperature Range | -40°C to 125°C | - |
| Package | TSSOP-38 | - |
Key Features
- Integrated analog front-end with overvoltage protection up to ±20 V
- Constant resistive input impedance of 1 MΩ
- On-chip, 4.096-V reference with low temperature drift
- Channel-independent programmable inputs with bipolar and unipolar ranges
- 4- or 8-channel multiplexer with auto and manual scan modes
- SPI-compatible serial interface with daisy-chain capability
- Low power consumption: 65 mW
- High performance: SNR of 73.8 dB, THD of –95 dB
- Alarm output with high and low thresholds per channel
- AUX input for direct connection to ADC inputs
Applications
- Power automation
- Protection relays
- PLC analog input modules
- Industrial control systems
- Medical devices requiring high precision ADCs
- Aerospace and defense applications
Q & A
- What is the resolution of the ADS8668 ADC?
The ADS8668 has a resolution of 12 bits.
- How many channels does the ADS8668 support?
The ADS8668 supports 8 channels.
- What is the sample rate of the ADS8668?
The sample rate of the ADS8668 is 500 kSPS.
- What are the input voltage ranges supported by the ADS8668?
The ADS8668 supports bipolar input ranges of ±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, and ±0.64 V, as well as unipolar ranges from 0 V to these maximum values.
- Does the ADS8668 have built-in overvoltage protection?
- What is the operating temperature range of the ADS8668?
The operating temperature range of the ADS8668 is -40°C to 125°C.
- What type of interface does the ADS8668 use for communication?
The ADS8668 uses a SPI-compatible serial interface and supports daisy-chaining of multiple devices.
- How much power does the ADS8668 consume?
The ADS8668 consumes approximately 65 mW of power.
- What is the package type of the ADS8668?
The ADS8668 comes in a TSSOP-38 package.
- Does the ADS8668 have an alarm output feature?
