Overview
The ADS8681IPW, produced by Texas Instruments, is a 16-bit, high-speed, single-supply Successive Approximation Register (SAR) analog-to-digital converter (ADC) integrated into a data acquisition system. This device features a high-precision SAR ADC, an integrated analog front-end (AFE), and overvoltage protection up to ±20 V. It operates on a single 5-V analog supply and supports both bipolar and unipolar input ranges, making it versatile for various applications. The ADS8681IPW is known for its excellent performance, including low differential nonlinearity (DNL) and integral nonlinearity (INL), high signal-to-noise ratio (SNR), and low total harmonic distortion (THD).
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Resolution | 16 | 16 | 16 | Bits |
| Sampling Rate | - | 1 | - | MSPS |
| Input Ranges (Bipolar) | ±12.288 V, ±10.24 V, ±6.144 V, ±5.12 V, ±2.56 V | - | - | V |
| Input Ranges (Unipolar) | 0 V–12.288 V, 0 V–10.24 V, 0 V–6.144 V, 0 V–5.12 V | - | - | V |
| Analog Supply Voltage | 4.75 | 5 | 5.25 | V |
| Digital Supply Voltage | 1.65 | 3.3 | 3.3 | V |
| DNL | -0.7 | ±0.4 | 0.7 | LSB |
| INL | -1.2 | ±0.5 | 1.2 | LSB |
| SNR | 90.25 | 92 | - | dB |
| THD | -109 | -107 | - | dB |
| Conversion Time | - | 665 ns | - | ns |
| Operating Temperature | -40 | - | 125 | °C |
Key Features
- High-speed SAR ADC with a sampling rate of up to 1 MSPS.
- Software programmable input ranges including bipolar and unipolar options.
- Integrated analog front-end (AFE) and overvoltage protection up to ±20 V.
- On-chip 4.096-V reference with low temperature drift.
- High resistive input impedance (≥ 1 MΩ).
- MultiSPI digital interface compatible with traditional SPI protocol.
- Configurable alarm thresholds and multifunction output pins.
- Extended industrial temperature range: -40°C to +125°C.
Applications
- Analog input modules.
- Semiconductor test equipment.
- Servo drive control modules.
- Industrial automation and control systems.
- Medical devices requiring high precision ADCs.
Q & A
- What is the resolution of the ADS8681IPW ADC?
The ADS8681IPW has a resolution of 16 bits.
- What are the available input ranges for the ADS8681IPW?
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 maximum sampling rate of the ADS8681IPW?
The maximum sampling rate is 1 MSPS.
- What is the operating temperature range of the ADS8681IPW?
The device operates in the temperature range of -40°C to +125°C.
- Does the ADS8681IPW have built-in overvoltage protection?
Yes, it has overvoltage protection up to ±20 V.
- What type of digital interface does the ADS8681IPW use?
The device uses a multiSPI digital interface compatible with traditional SPI protocol.
- What is the typical signal-to-noise ratio (SNR) of the ADS8681IPW?
The typical SNR is 92 dB.
- Does the ADS8681IPW have an internal reference voltage?
Yes, it has an on-chip 4.096-V reference with low temperature drift.
- What is the conversion time of the ADS8681IPW?
The conversion time is typically 665 ns.
- What are some common applications of the ADS8681IPW?
Common applications include analog input modules, semiconductor test equipment, servo drive control modules, and industrial automation systems.
