1 Features

• 8-channel, 20-bit ADC with analog front-end:

– Simultaneous sampling

– Constant 1MΩ input impedance front-end

– 2MSPS/ch speed for 8-channels

– Speed-boost mode: 8MSPS/ch for 2-channels

• 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: ±0.5ppm, INL: ±2.5ppm

– 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 ADS9803 is an eight-channel data acquisition

(DAQ) system based on a simultaneous sampling, 20-

bit successive approximation register (SAR) analogto-

digital converter (ADC). The ADS9803 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 ADS9803

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 ADS9803 to be used without external

voltage level translators.