LMP8602MA/NOPB National Semiconductor, LMP8602MA/NOPB Datasheet - Page 17

• Manufacturer Part Number: LMP8602MA/NOPB
• Description: IC AMP CURRENT SENSE 60V 8SOIC
• Manufacturer: National Semiconductor
• Series: LMP®r
• Type: Current Sense Amplifierr

Specifications of LMP8602MA/NOPB

• Amplifier Type: Current Sense
• Number Of Circuits: 1
• Slew Rate: 0.83 V/µs
• Gain Bandwidth Product: 60kHz
• Current - Input Bias: 0.04pA
• Voltage - Input Offset: 150µV
• Current - Supply: 1.1mA
• Current - Output / Channel: 48mA
• Voltage - Supply, Single/dual (±): 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• No. Of Amplifiers: 1
• Input Bias Current: 20nA
• Input Offset Voltage: 1mV
• Bandwidth: 60kHz
• Cmrr: 105dB
• Supply Voltage Range: 3V To 5.5V
• Supply Current: 1.3mA
• Rohs Compliant: Yes
• Number Of Channels: 1
• Number Of Elements: 2
• Power Supply Requirement: Single
• Common Mode Rejection Ratio: 80dB
• Voltage Gain Db: 34.02dB
• Single Supply Voltage (typ): 5V
• Dual Supply Voltage (typ): Not RequiredV
• Power Supply Rejection Ratio: 70dB
• Rail/rail I/o Type: No
• Single Supply Voltage (min): 3V
• Single Supply Voltage (max): 5.5V
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Mounting: Surface Mount
• Pin Count: 8
• Package Type: SOIC N
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: Compliant
• Other names: LMP8602MA

R
100 kΩ resistor such that, for the LMP8602, the reduced gain
G
For the LMP8603:
Given a desired value of the reduced gain G
tion the required value for R
LMP8602 with:
and for the LMP8603 with:
Figure 4
the gain of the LMP8602 and the LMP8603 in bidirectional
sensing applications. The required value for R
lated with the equations above. The maximum mid-scale
offset scaling accuracy of the LMP8602 is ±1% and the max-
imum mid-scale offset scaling accuracy of the LMP8603 is
±1.5%. The pair of resistors selected have to match much
better than 1% and 1.5% to prevent a significant error contri-
bution to the offset voltage.
r
r
FIGURE 4. Reduce Gain for Bidirectional Application
becomes:
creates a resistive divider together with the internal
shows the configuration that can be used to reduce
r
can be calculated for the
r
, using this equa-
r
can be calcu-
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17
Increase Gain
Figure 5
the gain of the LMP8602/LMP8602Q/LMP8603/LMP8603Q.
R
of the buffer amplifier. The positive feedback increases the
gain. The increased gain G
and for the LMP8603:
From this equation, for a desired value of the gain, the re-
quired value of R
and for the LMP8603 with:
It should be noted from the equation for the gain G
large gains R
denominator in the equation becomes close to zero. In prac-
tice, for large gains the denominator will be determined by
tolerances in the values of the external resistor R
internal 100 kΩ resistor, and the K
the gain becomes very inaccurate. If the denominator be-
comes equal to zero, the system will even become unstable.
It is recommended to limit the application of this technique to
gain increases of a factor 2.5 or smaller.
i
creates positive feedback from the output pin to the input
shows the configuration that can be used to increase
i
approaches 100 kΩ x (K
FIGURE 5. Increase Gain
i
can be calculated for the LMP8602 with:
i
for the LMP8602 becomes:
2
gain error. In this case,
2
- 1). In this case, the
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i
i
and the
that for
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