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LM324EDT-LM324EPT
Low power quad op-amps with low input bias current
June 2011 Doc ID 2156 Rev 7 1/19
LM124, LM224, LM324Low power quad operational amplifiers
Features Wide gain bandwidth: 1.3 MHz Input common-mode voltage range includes
ground Large voltage gain: 100 dB Very low supply current per amplifier: 375 µA Low input bias current: 20 nA Low input offset voltage: 5 mV max. Low input offset current: 2 nA Wide power supply range: Single supply: +3 V to +30 V Dual supplies: ±1.5 V to ±15 V
DescriptionThe LM124, LM224 and LM324 consist of four
independent, high gain, internally frequency-
compensated operational amplifiers. They
operate from a single power supply over a wide
range of voltages. Operation from split power
supplies is also possible and the low power
supply current drain is independent of the
magnitude of the power supply voltage.
Pin and schematic diagram LM124, LM224, LM3242/19 Doc ID 2156 Rev 7
Pin and schematic diagram
Figure 1. Pin connections (top view)
Figure 2. Schematic diagram (1/4 LM124)
LM124, LM224, LM324 Absolute maximum ratingsDoc ID 2156 Rev 7 3/19
Absolute maximum ratings Table 1. Absolute maximum ratings Either or both input voltages must not exceed the magnitude of VCC+ or VCC- . All voltage values, except differential voltages
are with respect to ground terminal. Differential voltages are the non-inverting input terminal with respect to the inverting input terminal. Short-circuits from the output to VCC can cause excessive heating if VCC > 15 V. The maximum output current is
approximately 40 mA independent of the magnitude of VCC. Destructive dissipation can result from simultaneous short-
circuits on all amplifiers. This input current only exists when the voltage at any of the input leads is driven negative. It is due to the collector-base
junction of the input PNP transistor becoming forward-biased and thereby acting as input diode clamp. In addition to this
diode action, there is NPN parasitic action on the IC chip. This transistor action can cause the output voltages of the op-
amps to go to the VCC voltage level (or to ground for a large overdrive) for the time during which an input is driven negative.
This is not destructive and normal output is restored for input voltages above -0.3V. The junction base/substrate of the input PNP transistor polarized in reverse must be protected by a resistor in series with
the inputs to limit the input current to 400 µA max (R= (Vin-32 V)/400 µA). Short-circuits can cause excessive heating. Destructive dissipation can result from simultaneous short-circuits on all
amplifiers. These are typical values given for a single layer board (except for TSSOP, a two-layer board). Human body model, 100 pF discharged through a 1.5 kΩ resistor into pin of device. Machine model ESD: a 200 pF capacitor is charged to the specified voltage, then discharged directly into the IC with no
external series resistor (internal resistor < 5 Ω), into pin-to-pin of device. Charged device model: all pins plus package are charged together to the specified voltage and then discharged directly to ground.
Electrical characteristics LM124, LM224, LM3244/19 Doc ID 2156 Rev 7
3 Electrical characteristics Table 2. VCC+ = +5 V, VCC- = ground, Vo = 1.4 V, Tamb = +25° C (unless otherwise
specified)
LM124, LM224, LM324 Electrical characteristicsDoc ID 2156 Rev 7 5/19 Vo = 1.4 V, Rs = 0 Ω, 5 V < VCC+ < 30 V, 0 < Vic < VCC+ - 1.5 V. The direction of the input current is out of the IC. This current is essentially constant, independent of the
state of the output so there is no change in the load on the input lines. The input common-mode voltage of either input signal voltage should not be allowed to go negative by
more than 0. V. The upper end of the common-mode voltage range is VCC+ - 1.5 V, but either or both inputs
can go to +32 V without damage. Due to the proximity of the external components, ensure that stray capacitance between these external
parts does not cause coupling. Coupling can be detected because this type of capacitance increases at
higher frequencies.
Table 2. VCC+ = +5 V, VCC- = ground, Vo = 1.4 V, Tamb = +25° C (unless otherwise
specified) (continued)
