ADS7834E Burr-Brown Corporation, ADS7834E Datasheet - Page 13

• Manufacturer Part Number: ADS7834E
• Description: 12-Bit High Speed Low Power Sampling ANALOG-TO-DIGITAL CONVERTER
• Manufacturer: Burr-Brown Corporation

With this in mind, power to the ADS7834 should be clean
and well bypassed. A 0.1 F ceramic bypass capacitor should
be placed as close to the device as possible. In addition, a
1 F to 10 F capacitor is recommended. If needed, an even
larger capacitor and a 5 or 10 series resistor my be used
to lowpass filter a noisy supply.
The ADS7834 draws very little current from an external
reference on average as the reference voltage is internally
buffered. However, glitches from the conversion process
appear at the V
able to handle this. Whether the reference is internal or
external, the V
REF
REF
pin should be bypassed with a 0.1 F
input and the reference source must be
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capacitor. An additional larger capacitor may also be used,
if desired. If the reference voltage is external and originates
from an op-amp, make sure that it can drive the bypass
capacitor or capacitors without oscillation.
The GND pin should be connected to a clean ground point.
In many cases, this will be the “analog” ground. Avoid
connections which are too near the grounding point of a
microcontroller or digital signal processor. If needed, run a
ground trace directly from the converter to the power supply
entry point. The ideal layout will include an analog ground
plane dedicated to the converter and associated analog
circuitry.
ADS7834
®