1 Features
• 8-channel, 18-bit ADC with analog front-end:
– Simultaneous sampling
– Constant 1MΩ input impedance front-end
• Programmable analog input ranges:
– ±12V, ±10V, ±7V, ±5V, ±3.5V, and ±2.5V
– Single-ended and differential inputs
– Common-mode voltage range: ±12V
– Input overvoltage protection: Up to ±18V
• User-selectable analog input bandwidth:
– 22.7kHz and 700kHz
• Integrated low-drift precision references:
– ADC reference: 4.096V
– 2.5V reference output for external circuits
• Excellent AC and DC performance at fullthroughput:
– DNL: ±0.35LSB, INL: ±0.8LSB
– SNR: 90.3dBFS, THD: –113dB
• Power supply:
– Analog and digital: 5V and 1.8V
– Digital interface: 1.2V to 1.8V
• Temperature range: –40°C to +125°C

2 Applications
• Semiconductor test
• Programmable DC power supplies
• Parametric measurement units (PMU)

3 Description
The ADS9813 is an eight-channel data acquisition
(DAQ) system based on a simultaneous sampling, 18-
bit successive approximation register (SAR) analogto-
digital converter (ADC). The ADS9813 features a
complete analog front-end (AFE) for each channel
with an input clamp. The device also features a 1MΩ
input impedance and a programmable gain amplifier
(PGA) with user-selectable bandwidth options. The
high input impedance allows direct connection with
sensors and transformers, thus eliminating the need
for external driver circuits. Configure the ADS9813
to accept ±12V, ±10V, ±7V, ±5V, ±3.5V, and ±2.5V
bipolar inputs with up to ±12V input common-mode
voltage.
A digital interface supporting 1.2V to 1.8V operation
enables the ADS9813 to be used without external
voltage level translators.