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LM324-TR Datasheet(PDF) 10 Page - 3PEAK INC.

No. de pieza LM324-TR
Descripción Electrónicos  1.2MHz, Low-Power 36V Op Amps
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Fabricante Electrónico  3PEAK [3PEAK INC.]
Página de inicio  http://www.3peakic.com/
Logo 3PEAK - 3PEAK INC.

LM324-TR Datasheet(HTML) 10 Page - 3PEAK INC.

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10
Rev. B.01
www.3peakic.com.cn
LM321 / LM358 / LM324
1.2MHz, Low-Power 36V Op Amps
10k
Ω
5pF
10k
Ω
CPAR
VIN
VOUT
Figure 2
Driving Large Capacitive Load
The LM321/358/324 of OPA is designed to drive large capacitive loads. Refer to Typical Performance Characteristics
for “Phase Margin vs. Load Capacitance”. As always, larger load capacitance decreases overall phase margin in a
feedback system where internal frequency compensation is utilized.
As the load capacitance increases, the feedback
loop’s phase margin decreases, and the closed-loop bandwidth is reduced. This produces gain peaking in the
frequency response, with overshoot and ringing in output step response. The unity-gain buffer (G = +1V/V) is the most
sensitive to large capacitive loads.
When driving large capacitive loads with the LM321/358/324 (e.g., > 200 pF when G = +1V/V), a small series resistor
at the output (RISO in Figure 3) improves the feedback loop’s phase margin and stability by making the output load
resistive at higher frequencies.
VIN
VOUT
CLOAD
RISO
Figure 3
Power Supply Layout and Bypass
The LM321/358/324 OPA
’s power supply pin should have a local bypass capacitor (i.e., 0.01μF to 0.1μF) within 2mm
for good high frequency performance. It can also use a bulk capacitor
(i.e., 1μF or larger) within 100mm to provide
large, slow currents. This bulk capacitor can be shared with other analog parts.
Ground layout improves performance by decreasing the amount of stray capacitance and noise at the OPA
’s inputs
and outputs. To decrease stray capacitance, minimize PC board lengths and resistor leads, and place external
components
as close to the op amps’ pins as possible.
Proper Board Layout
To ensure optimum performance at the PCB level, care must be taken in the design of the board layout. To avoid
leakage currents, the surface of the board should be kept clean and free of moisture. Coating the surface creates a
barrier to moisture accumulation and helps reduce parasitic resistance on the board.
Keeping supply traces short and properly bypassing the power supplies minimizes power supply disturbances due to
output current variation, such as when driving an ac signal into a heavy load. Bypass capacitors should be connected
as closely as possible to the device supply pins. Stray capacitances are a concern at the outputs and the inputs of the
amplifier. It is recommended that signal traces be kept at least 5mm from supply lines to minimize coupling.
A variation in temperature across the PCB can cause a mismatch in the Seebeck voltages at solder joints and other
points where dissimilar metals are in contact, resulting in thermal voltage errors. To minimize these thermocouple
effects, orient resistors so heat sources warm both ends equally. Input signal paths should contain matching numbers


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