LM359M National Semiconductor, LM359M Datasheet - Page 7

• Manufacturer Part Number: LM359M
• Description: IC AMP DUAL PROG CUR MODE 14SOIC
• Manufacturer: National Semiconductor

Specifications of LM359M

• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Slew Rate: 60 V/µs
• Gain Bandwidth Product: 400MHz
• Current - Input Bias: 8µA
• Current - Supply: 18.5mA
• Current - Output / Channel: 40mA
• Voltage - Supply, Single/dual (±): 5 V ~ 22 V, ±2.5 V ~ 11 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Output Type: -
• -3db Bandwidth: -
• Voltage - Input Offset: -
• Other names: *LM359M

Application Hints
DC BIASING
The LM359 is intended for single supply voltage operation
which requires DC biasing of the output. The current mirror
circuitry which provides the non-inverting input for the ampli-
fier also facilitates DC biasing the output. The basic opera-
tion of this current mirror is that the current (both DC and AC)
flowing into the non-inverting input will force an equal
amount of current to flow into the inverting input . The mirror
gain (A
two currents match. For more details see National Applica-
tion Note AN-72.
DC biasing of the output is accomplished by establishing a
reference DC current into the (+) input, I
the output to provide the (−) input current. This forces the
I
) specification is the measure of how closely these
FIGURE 1.
(Continued)
IN
(+), and requiring
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output DC level to be whatever value necessary (within the
output voltage swing of the amplifier) to provide this DC
reference current, Figure 2.
The DC input voltage at each input is a transistor V
(. 0.6 V
most applications, the supply voltage, V
convenient for establishing I
current, I
stage current (see current programmability section) and to
obtain predictable output DC biasing set I
b
DC
(−), is a direct function of the programmable input
) and must be considered for DC biasing. For
FIGURE 2.
IN
(+). The inverting input bias
+
IN
, is suitable and
(+) ≥ 10I
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b
(−).
BE