LMP8601MA/NOPB National Semiconductor, LMP8601MA/NOPB Datasheet - Page 12

• Manufacturer Part Number: LMP8601MA/NOPB
• Description: IC AMP CURRENT SENSE 60V 8SOIC
• Manufacturer: National Semiconductor
• Series: LMP®r

Specifications of LMP8601MA/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: 90dB
• Supply Voltage Range: 3V To 5.5V
• Supply Current: 1.1mA
• Rohs Compliant: Yes
• Number Of Channels: 1
• Common Mode Rejection Ratio (min): 80 dB
• Available Set Gain: 26.06 dB
• Operating Supply Voltage: 5 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 3 V
• For Use With: LMP8601MAEVAL - BOARD EVALUATION FOR LMP8601MA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: Details
• Other names: *LM8601MA/NOPB; LMP8601MA

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Application Information
GENERAL
The LMP8601 and LMP8601Q are fixed gain differential volt-
age precision amplifiers with a gain of 20x and a -22V to +60V
input common mode voltage range when operating from a
single 5V supply or a -4V to +27V input common mode voltage
range when operating from a single 3.3V supply. The
LMP8601 and LMP8601Q are members of the LMP family
and are ideal parts for unidirectional and bidirectional current
sensing applications. Because of the proprietary chopping
level-shift input stage the LMP8601/LMP8601Q achieve very
low offset, very low thermal offset drift, and very high CMRR.
The LMP8601 and LMP8601Q will amplify and filter small dif-
ferential signals in the presence of high common mode volt-
ages.
The LMP8601/LMP8601Q use level shift resistors at the in-
puts. Because of these resistors, the LMP8601/LMP8601Q
can easily withstand very large differential input voltages that
may exist in fault conditions where some other less protected
high-performance current sense amplifiers might sustain per-
manent damage.
PERFORMANCE GUARANTIES
To guaranty the high performance of the LMP8601/ LM-
P8601Q, all minimum and maximum values shown in the
parameter tables of this data sheet are 100% tested where all
bold limits are also 100% tested over temperature.
FIGURE 1. Theory of Operation
K2 = 2
12
THEORY OF OPERATION
The schematic shown in
sentation
LMP8601/LMP8601Q.
The signal on the input pins is typically a small differential
voltage across a current sensing shunt resistor. The input
signal may appear at a high common mode voltage. The input
signals are accessed through two input resistors. The propri-
etary chopping level-shift current circuit pulls or pushes cur-
rent through the input resistors to bring the common mode
voltage behind these resistors within the supply rails. Subse-
quently, the signal is gained up by a factor of 10 and brought
out on the A1 pin through a trimmed 100 kΩ resistor. In the
application, additional gain adjustment or filtering compo-
nents can be added between the A1 and A2 pins as will be
explained in subsequent sections. The signal on the A2 pin is
further amplified by a factor of 2 and brought out on the OUT
pin. The OFFSET pin allows the output signal to be level-
shifted to enable bidirectional current sensing as will be ex-
plained below.
of
the
Figure 1
internal
20157105
gives a schematic repre-
operation
of
the