LMP8601MAEVAL/NOPB National Semiconductor, LMP8601MAEVAL/NOPB Datasheet - Page 14

• Manufacturer Part Number: LMP8601MAEVAL/NOPB
• Description: BOARD EVALUATION FOR LMP8601MA
• Manufacturer: National Semiconductor
• Series: LMP®r

Specifications of LMP8601MAEVAL/NOPB

• Channels Per Ic: 1 - Single
• Amplifier Type: Current Sense
• Output Type: Single-Ended
• Slew Rate: 0.83 V/µs
• Current - Output / Channel: 48mA
• Operating Temperature: -40°C ~ 125°C
• Current - Supply (main Ic): 1.1mA
• Voltage - Supply, Single/dual (±): 3 V ~ 5.5 V
• Board Type: Fully Populated
• Utilized Ic / Part: LMP8601
• Silicon Manufacturer: National
• Silicon Core Number: LMP8601, LMP8601Q
• Kit Application Type: Amplifier
• Application Sub Type: Current-Sense Amplifier
• Kit Contents: Board, Doc
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -
• Other names: LMP8601MAEVAL

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GAIN ADJUSTMENT
The gain of the LMP8601/LMP8601Q is 20; however, this
gain can be adjusted as the signal path in between the two
internal amplifiers is available on the external pins.
R
100 kΩ resistor such that the reduced gain G
Given a desired value of the reduced gain G
tion the required value for R
r
creates a resistive divider together with the internal
r
can be calculated with:
FIGURE 2. Second Order Low Pass Filter
r
, using this equa-
r
becomes:
FIGURE 3. Reduce Gain
K1 = 10, K2 = 2
K2 = 2
14
Reduce Gain
Figure 3
the gain of the LMP8601/LMP8601Q.
Increase Gain
Figure 4
the gain of the LMP8601/LMP8601Q.
R
of the buffer amplifier. The positive feedback increases the
gain. The increased gain G
i
creates positive feedback from the output pin to the input
shows the configuration that can be used to increase
shows the configuration that can be used to reduce
20157156
i
becomes:
20157155