1 Features

• 16-channel, 16-bit ADC with integrated analog

front-end

• Dual simultaneous sampling: 8x2 channels

• Supply:

– Analog: 5 V

– Digital: 1.8 V to 5 V

• Constant 1-MΩ input impedance front-end

• 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

• Excellent over temperature performance

• Overvoltage input clamp with 8-kV ESD

• Optional cyclic redundancy check (CRC) error

checking

• On-chip self diagnostic function

• Temperature range: –40°C to +125°C

2 Applications

• Multifunction relays

• Servo drive position sensors

• Analog input modules

• Data acquisition (DAQ)

3 Description

The ADS8686S is a 16-channel data acquisition

(DAQ) system based on a dual simultaneoussampling,

16-bit successive approximation register

(SAR) analog-to-digital converter (ADC). The

ADS8686S features a complete analog front-end

for each channel with an input clamp, 1-MΩ

input impedance, independently programmable gain

amplifier (PGA), programmable low-pass filter, and an

ADC input driver. The device also features a low-drift,

precision reference with a buffer to drive the ADCs. A

flexible digital interface supporting serial, parallel, and

byte communication enables the device to be used

with a variety of host controllers.

The ADS8686S 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, thus eliminating the need

for external driver circuits. The ADS8686S has a

highly configurable channel sequencer to reduce the

sequencing overhead on the backend controller or

processor. The high performance and accuracy, along

with zero-latency conversions offered by this device

make the ADS8686S a great choice for multiple

industrial applications.