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.