28119 Parallax Inc, 28119 Datasheet - Page 112
28119
Manufacturer Part Number
28119
Description
KIT UNDERSTANDING SIGNALS
Manufacturer
Parallax Inc
Datasheet
1.28119.pdf
(137 pages)
Specifications of 28119
Lead Free Status
Contains lead
Accessory Type
Oscilloscope
Interface Type
USB
For Use With/related Products
BASIC Stamp® 2 and Board of Education
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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Therefore, a 20 kΩ resistor is needed for Rf, given a 10 kΩ resistor for Ri and a desired
gain of 2. Remember, the 10 kΩ resistor in the input impedance of the op-amp.
Two 10 kΩ resistors would present themselves as an additional load (Figure 8-6). The
two 10 kΩ resistors when measured at the middle should yield 2.5 V. When you connect
your op-amp circuit to a 2.5 V signal, you might see something less than 2.5 V. The
output impedance of the resistor divider is high, meaning it does not supply very much
current. The inverting op-amp circuit has low input impedance, hence the 10 kΩ input
resistor. So, the op-amp circuit will load down the 2.5 V signal, causing it to sag.
When using inverting op-amp circuits, keep what you have just learned in mind. You can
increase the value of Ri in the op-amp circuit to increase the input impedance, but if you
can, keep the value around 10 kΩ.
A non-inverting voltage amplifier has its input signal applied directly to the non-inverting
input of the op-amp (Figure 8-7). This gives you very high input impedance, up to 2 MΩ
Vss
Vss
+5
Signal
Ri
Vss
Vss
OPAMP 10 k Input
approximation
impedance
Rf
Vss
Vout
Figure 8-6:
Two 10k resistors
have significant
output impedance.
Figure 8-7:
Non-inverting
Voltage Amplifier
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