1 Features

• Compact low-power data acquisition system:

– MUX breakout enables single external driver

amplifier

– 16-bit SAR ADC

– Low-drift integrated reference and buffer

– 0.5 × VREF output for analog input DC biasing

• Excellent AC and DC performance:

– SNR: 92dB, THD: –110dB

– INL: ±0.3LSB, 16-bit no missing codes

• Multiplexer with channel sequencer:

– Multiple channel-sequencing options:

• Manual mode, on-the-fly mode, auto

sequence mode, custom channel

sequencing

– Fast response time with on-the-fly mode

• System monitoring features:

– Per channel programmable window comparator

– False trigger avoidance with programmable

hysteresis

• Enhanced-SPI digital interface:

– 1MSPS throughput with 16MHz SCLK

– High-speed, 50MHz digital interface

• Wide operating range:

– External VREF input range: 2.5V to 5V

– AVDD from 3V to 5.5V

– DVDD from 1.65V to 5.5V

– –40°C to +125°C temperature range

2 Applications

• Chemistry, gas analyzers

• Anesthesia delivery systems

• Mixed modules (AI, AO, DI, DO)

• Intra-DC interconnects (metro)

3 Description

The ADS816x is a family of 16-bit, 8-channel,

high-precision successive approximation register

(SAR) analog-to-digital converters (ADCs). The ADCs

operate from a single 5V supply with a 1MSPS

(ADS8168), 500kSPS (ADS8167), and 250kSPS

(ADS8166) total throughput.

The input multiplexer supports extended settling time,

which makes driving the analog inputs easier. The

output of the multiplexer and ADC analog inputs are

available as device pins. This configuration allows one

ADC driver op amp to be used for all eight analog

inputs of the multiplexer.

The ADS816x features a digital window comparator

with programmable high and low alarm thresholds per

analog input channel. The single op-amp solution with

programmable alarm thresholds enables low power,

low cost, and smallest form-factor applications.