1 Features
• 8-channel, 18-bit ADC with analog front-end:
– Dual, simultaneous sampling: 4 × 1 channels
– Constant 1-MΩ input impedance front-end
• Programmable low-pass filter bandwidth:
– 21 kHz and 400 kHz
• Programmable input ranges:
– ±12 V, ±10 V, ±7 V, ±5 V, ±3.5 V, and ±2.5 V
– Single-ended and differential inputs
• Input overvoltage protection: Up to ±18 V
• Integrated low-drift 4.096-V precision reference
• Excellent performance:
– DNL: ±0.3 LSB, INL: ±1.5 LSB
– SNR: 92.2 dB, THD: –112 dB
• Power supply:
– Analog and digital: 5 V and 1.8 V
– Digital interface: 1.2 V to 1.8 V
• Temperature range: –40°C to +125°C

2 Applications
• Semiconductor test
• Battery test
• Data acquisition (DAQ)

3 Description
The ADS981x is an eight-channel data acquisition
(DAQ) system based on a dual, simultaneoussampling,
18-bit successive approximation register
(SAR) analog-to-digital converter (ADC). The
ADS981x 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
high-speed digital interface supporting 1.2-V to 1.8-V
operation enables the ADS981x to be used with a
variety of host controllers.
The ADS981x can be configured to accept ±12-V,
±10-V, ±7-V, ±5-V, ±3.5-V, and ±2.5-V bipolar inputs.
The high input impedance allows direct connection
with sensors and transformers, thus eliminating the
need for external driver circuits. The high performance
and accuracy, along with zero-latency conversions
offered by this device make the ADS981x a great
choice for multiple industrial applications.