Overview
The ADS8681IRUMR, produced by Texas Instruments, is a high-performance, 16-bit, single-supply, successive approximation register (SAR) analog-to-digital converter (ADC). This device is part of the ADS868x family and is known for its high speed and precision. It operates on a single 5-V analog supply and supports both bipolar and unipolar input ranges, making it versatile for various applications. The ADS8681IRUMR features an integrated analog front-end (AFE), overvoltage protection, and an on-chip 4.096-V reference with low temperature drift.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| 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 to 5.25 V | V |
| Digital Supply Voltage | 1.65 to 3.3 V | V |
| Conversion Time | 665 ns | ns |
| Acquisition Time | 335 ns | ns |
| DNL (Differential Nonlinearity) | ±0.4 LSB | LSB |
| INL (Integral Nonlinearity) | ±0.5 LSB | LSB |
| SNR (Signal-to-Noise Ratio) | 92 dB | dB |
| THD (Total Harmonic Distortion) | –107 dB | dB |
| Operating Temperature Range | –40°C to +125°C | °C |
Key Features
- High-speed SAR ADC with 1 MSPS sampling rate
- Software programmable bipolar and unipolar input ranges
- Integrated analog front-end (AFE) and overvoltage protection up to ±20 V
- On-chip 4.096-V reference with low temperature drift
- Excellent performance with DNL of ±0.4 LSB and INL of ±0.5 LSB
- High SNR of 92 dB and low THD of –107 dB
- MultiSPI™ interface with daisy-chain capability
- Extended industrial temperature range: –40°C to +125°C
- Constant resistive input impedance ≥ 1 MΩ
- Alarm function with high and low threshold settings
Applications
- Analog input modules
- Semiconductor test equipment
- Servo drive control modules
- Industrial automation and control systems
- Data acquisition systems in various industries
Q & A
- What is the resolution of the ADS8681IRUMR ADC?
The ADS8681IRUMR has a resolution of 16 bits.
- What are the supported input ranges for the ADS8681IRUMR?
The device supports both bipolar ranges (±12.288 V, ±10.24 V, ±6.144 V, ±5.12 V, ±2.56 V) and unipolar ranges (0 V–12.288 V, 0 V–10.24 V, 0 V–6.144 V, 0 V–5.12 V).
- What is the sampling rate of the ADS8681IRUMR?
The ADS8681IRUMR has a sampling rate of 1 MSPS.
- What is the operating temperature range of the ADS8681IRUMR?
The device operates over an extended industrial temperature range of –40°C to +125°C.
- Does the ADS8681IRUMR have built-in overvoltage protection?
- What type of interface does the ADS8681IRUMR use for serial communication?
The device uses a multiSPI™ interface with daisy-chain capability.
- What is the typical signal-to-noise ratio (SNR) of the ADS8681IRUMR?
The typical SNR is 92 dB.
- What is the total harmonic distortion (THD) of the ADS8681IRUMR?
The THD is typically –107 dB.
- Does the ADS8681IRUMR have an on-chip reference voltage?
- What are some common applications of the ADS8681IRUMR?
