ADS7810
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SBAS014A –MARCH 1992–REVISED SEPTEMBER 2010
REFERENCE
limit noise on the reference. Using a smaller value
capacitor will introduce more noise to the reference
degrading the SNR and SINAD. The internal
reference should not be used to sink or source
currents greater than 100mA. In addition, all external
loads should be static.
The ADS7810 can operate with its internal 2.5V
reference or an external reference. By applying an
external reference to pin 3, the internal reference can
be bypassed. The reference voltage at REF is
buffered internally and output on CAP (pin 4).
The range for the external reference is 2.3V to 2.7V
and determines the actual LSB size. Increasing the
reference voltage will increase the full-scale range
and the LSB size of the converter which can improve
the SNR.
REF
REF (pin 3) is an input for an external reference or
the output for the internal 2.5V reference. A 0.1mF
capacitor should be connected as close to the REF
pin as possible. The capacitor and the output
resistance of REF create a low pass filter to band
Digital
Output
+Full-Scale
-10.0V -9.84V
Analog
Input
9.84V
10.0V
Typical Transfer Function
with 50W Resistor
Typical Transfer Function
without 50W Resistor
-Full-Scale
Figure 17. Comparison of the ADS7810 Transfer Function with and without the 50Ω Series Resistor on
VIN
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