Datasheet

R
X
TLV2780
C
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
R
1
R
2
ADS7924
SensorSignals
MSP430
Microcontroller
SHDN
DVDD
AVDD
1 Fm
1 Fm
3kW 3kW
ADS7924
SBAS482A –JANUARY 2010–REVISED MAY 2010 www.ti.com
Op Amp with Filter and Gain Option
Both filtering and gain are added in Figure 38. Gain is given by Equation 8:
Gain = 1 + R
1
/R
2
Where:
R is the sum of the sensor output impedance R
SENSOR
, the internal MUX resistance R
MUX
(approximately
60Ω), and the external resistor R
X
. (8)
NOTE: f
–3dB
BW = 159kHz, R = 1kΩ, and C = 1nF where R = R
MUX
+ R
SENSOR
+ R
X
, and R
MUX
is approximately 60Ω. Gain = 1 + R
1
/R
2
.
Figure 38. Sensor Data Acquisition with Gain Set Resistors, Filter, and TLV2780 Buffer Amplifier
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