Datasheet
TLV2780
RESET
INT
SCL
SDA
CH0
CH1
CH2
CH3
1
2
3
4
12
11
10
9
DVDD
16
A0
5
AVDD
15
DGND
6
ADCIN
14
PWRCON
7
MUXOUT
13
AGND
8
C
R
ADS7924
SensorSignals
MSP430
Microcontroller
SHDN
DVDD
AVDD
1 Fm
1 Fm
3kW 3kW
ADS7924
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SBAS482A –JANUARY 2010–REVISED MAY 2010
Driving an RC Filter and the ADCIN Pin With An Op Amp
A filter can be placed at the output of the op amp, as shown in Figure 39. Care must be taken to ensure that the
op amp is capable of driving the RC filter circuit without the op amp becoming unstable. One of the benefits of
this circuit is that the op amp noise is filtered along with sensor and other system noise right at the ADC input
pin.
NOTE: C = 200pF, R = 1kΩ, and the capacitance at the ADCIN pin is approximately 15pF.
Figure 39. Sensor Data Acquisition with an Op Amp Driving an RC Filter
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