Overview
The ADS8691IPWR, produced by Texas Instruments, is a high-performance, 18-bit, 1-MSPS (Mega Samples Per Second), single-channel Successive Approximation Register (SAR) Analog-to-Digital Converter (ADC). This device is part of the ADS869x family, which includes integrated data acquisition systems with programmable bipolar and unipolar input ranges. The ADS8691IPWR operates on a single 5-V analog supply and features an integrated analog front-end (AFE) input driver circuit, overvoltage protection up to ±20 V, and an on-chip 4.096-V reference with low temperature drift.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 18 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 to 5.25 V | V |
| Digital Supply Voltage | 1.65 to 5 V | V |
| Input Impedance | ≥ 1 MΩ | Ω |
| Overvoltage Protection | Up to ±20 V | V |
| Reference Voltage | 4.096 V (on-chip) | V |
| DNL (Differential Nonlinearity) | ±0.6 LSB | LSB |
| INL (Integral Nonlinearity) | ±1.75 LSB | LSB |
| SNR (Signal-to-Noise Ratio) | 92.5 dB | dB |
| THD (Total Harmonic Distortion) | –110 dB | dB |
| Operating Temperature Range | –40°C to +125°C | °C |
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) input driver circuit
- 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 with daisy-chain capability
- Extended industrial temperature range: –40°C to +125°C
- ALARM features for high and low threshold detection
Applications
- Analog input modules
- Data acquisition (DAQ) systems
- Semiconductor testing
- LCD testing
Q & A
- What is the resolution of the ADS8691IPWR ADC?
The ADS8691IPWR has a resolution of 18 bits. - What are the sampling rates of the ADS869x family?
The ADS8691 samples at 1 MSPS, the ADS8695 at 500 kSPS, and the ADS8699 at 100 kSPS. - What are the programmable input ranges for the ADS8691IPWR?
The device supports bipolar ranges of ±12.288 V, ±10.24 V, ±6.144 V, ±5.12 V, and ±2.56 V, as well as unipolar ranges of 0 V to 12.288 V, 0 V to 10.24 V, 0 V to 6.144 V, and 0 V to 5.12 V. - What is the analog supply voltage range for the ADS8691IPWR?
The analog supply voltage range is from 4.75 V to 5.25 V. - Does the ADS8691IPWR have overvoltage protection?
Yes, it has overvoltage protection up to ±20 V. - What is the reference voltage of the ADS8691IPWR?
The device has an on-chip 4.096-V reference with low temperature drift. - What is the input impedance of the ADS8691IPWR?
The input impedance is ≥ 1 MΩ. - What is the operating temperature range of the ADS8691IPWR?
The operating temperature range is from –40°C to +125°C. - Does the ADS8691IPWR support multiple digital interfaces?
Yes, it features a multiSPI™ digital interface that is backward-compatible with the traditional SPI protocol. - What are some common applications of the ADS8691IPWR?
Common applications include analog input modules, data acquisition systems, semiconductor testing, and LCD testing.
