Overview
The ADS8681IPWR is a high-performance, 16-bit successive approximation register (SAR) analog-to-digital converter (ADC) produced by Texas Instruments. This device is part of the ADS868x family, which includes the ADS8681, ADS8685, and ADS8689. The ADS8681IPWR operates at a sampling rate of 1 MSPS and features an integrated analog front-end (AFE) with input driver circuitry, overvoltage protection up to ±20 V, and an on-chip 4.096-V reference with low temperature drift. It is designed for applications requiring high-speed and high-precision data acquisition.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 16 bits |
| Sampling Rate | 1 MSPS |
| Input Ranges (Bipolar) | ±12.288 V, ±10.24 V, ±6.144 V, ±5.12 V, ±2.56 V |
| Input Ranges (Unipolar) | 0 V–12.288 V, 0 V–10.24 V, 0 V–6.144 V, 0 V–5.12 V |
| Analog Supply Voltage | 4.75 V to 5.25 V |
| Digital I/O Supply Voltage | 1.65 V to 5 V |
| Operating Temperature Range | –40°C to +125°C |
| Package Type | TSSOP (PW) with 16 pins |
| Input Impedance | ≥ 1 MΩ |
| DNL | ±0.4 LSB |
| INL | ±0.5 LSB |
| SNR | 92 dB |
| THD | –107 dB |
Key Features
- High-speed SAR ADC with 1 MSPS sampling rate
- Software programmable input ranges for both bipolar and unipolar inputs
- Integrated analog front-end (AFE) with constant resistive input impedance ≥ 1 MΩ
- Input overvoltage protection up to ±20 V
- On-chip 4.096-V reference with low temperature drift
- Excellent performance metrics: DNL ±0.4 LSB, INL ±0.5 LSB, SNR 92 dB, THD –107 dB
- MultiSPI™ interface with daisy-chain capability
- ALARM feature for high and low threshold detection
- Extended industrial temperature range: –40°C to +125°C
Applications
- Analog input modules
- Semiconductor test equipment
- Servo drive control modules
- High-precision data acquisition systems
- Industrial automation and control systems
Q & A
- What is the sampling rate of the ADS8681IPWR?
The ADS8681IPWR has a sampling rate of 1 MSPS. - What are the available input ranges for the ADS8681IPWR?
The device supports both bipolar and unipolar input ranges: ±12.288 V, ±10.24 V, ±6.144 V, ±5.12 V, ±2.56 V (bipolar); 0 V–12.288 V, 0 V–10.24 V, 0 V–6.144 V, 0 V–5.12 V (unipolar). - What is the operating temperature range of the ADS8681IPWR?
The operating temperature range is –40°C to +125°C. - What type of interface does the ADS8681IPWR use?
The device uses a multiSPI™ interface with daisy-chain capability. - Does the ADS8681IPWR have built-in overvoltage protection?
Yes, it has input overvoltage protection up to ±20 V. - What is the resolution of the ADS8681IPWR?
The resolution is 16 bits. - What is the analog supply voltage range for the ADS8681IPWR?
The analog supply voltage range is 4.75 V to 5.25 V. - Does the ADS8681IPWR support external reference voltage?
Yes, it supports both internal and external reference voltages. - What are the key performance metrics of the ADS8681IPWR?
The key performance metrics include DNL ±0.4 LSB, INL ±0.5 LSB, SNR 92 dB, and THD –107 dB. - What package type is the ADS8681IPWR available in?
The device is available in a TSSOP (PW) package with 16 pins.
