Overview
The ADS8686SIPZA, produced by Texas Instruments, is a 16-channel data acquisition (DAQ) system based on a dual simultaneous-sampling, 16-bit successive approximation register (SAR) analog-to-digital converter (ADC). This device features a complete analog front-end for each channel, including an input clamp, 1-MΩ input impedance, independently programmable gain amplifier (PGA), programmable low-pass filter, and an ADC input driver. It supports a flexible digital interface for serial, parallel, and byte communication, making it versatile for use with various host controllers.
The ADS8686SIPZA can be configured to accept ±10-V, ±5-V, or ±2.5-V bipolar inputs with a 20% overrange option using a single 5-V supply. The high input impedance allows direct connection with sensors and transformers, eliminating the need for external driver circuits. The device also includes a low-drift, precision reference with a buffer to drive the ADCs and offers excellent DC and AC performance over a wide temperature range of –40°C to +125°C.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Channels | 16 |
| Resolution | 16-bit |
| Sampling Rate | 1 MSPS |
| Simultaneous Sampling | Dual: 8x2 channels |
| Analog Supply Voltage | 5 V |
| Digital Supply Voltage | 1.8 V to 5 V |
| Input Impedance | 1 MΩ |
| Input Ranges | ±10 V, ±5 V, ±2.5 V with 20% overrange |
| Programmable Low-Pass Filter | 15 kHz, 39 kHz, 376 kHz |
| Operating Temperature Range | –40°C to +125°C |
| Package | 80-pin LQFP (PZA) |
| ESD Protection | 8-kV ESD on analog input pins |
Key Features
- 16-channel, 16-bit ADC with integrated analog front-end
- Dual simultaneous sampling: 8x2 channels
- Independently programmable input ranges with 20% overrange
- Programmable low-pass filter: 15 kHz, 39 kHz, 376 kHz
- Excellent DC and AC performance
- On-chip reference and reference buffer
- Overvoltage input clamp with 8-kV ESD protection
- Optional cyclic redundancy check (CRC) error checking
- On-chip self-diagnostic function
- Flexible digital interface supporting serial, parallel, and byte communication
Applications
- Multifunction relays
- Servo drive position sensors
- Analog input modules
- Data acquisition (DAQ) systems
- Industrial automation and control systems
Q & A
- What is the resolution and sampling rate of the ADS8686SIPZA?
The ADS8686SIPZA has a 16-bit resolution and a sampling rate of 1 MSPS.
- What are the supported input ranges for the ADS8686SIPZA?
The device supports ±10 V, ±5 V, and ±2.5 V bipolar inputs with a 20% overrange option.
- What is the input impedance of the ADS8686SIPZA?
The input impedance is 1 MΩ.
- Does the ADS8686SIPZA have built-in ESD protection?
Yes, it has 8-kV ESD protection on the analog input pins.
- What types of digital interfaces does the ADS8686SIPZA support?
The device supports serial, parallel, and byte communication interfaces.
- What is the operating temperature range of the ADS8686SIPZA?
The operating temperature range is –40°C to +125°C.
- What package type is the ADS8686SIPZA available in?
The device is available in an 80-pin LQFP (PZA) package.
- Does the ADS8686SIPZA have on-chip diagnostic functions?
Yes, it includes an on-chip self-diagnostic function and optional CRC error checking.
- What are some typical applications of the ADS8686SIPZA?
Typical applications include multifunction relays, servo drive position sensors, analog input modules, and data acquisition systems.
- Can the ADS8686SIPZA be used in safety-critical applications?
While it offers high performance and reliability, it is important to consult the datasheet and relevant safety standards before using it in safety-critical applications.
