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CBMLM321-CBMLM358-CBMLM324

OPERATION INSTRUCTION

APPLICATION NOTES

Size

CBMLM358 family series op amps are unity-gain stable and suitable for a wide range of

general-purpose applications. The small footprints of the CBMLM358 family packages save space

on printed circuit boards and enable the design of smaller electronic products.

Power Supply Bypassing and Board Layout

CBMLM358 family series operates from a single 3V to 24V supply or dual ±1.5V to ±12V

bypassed to ground with separate 0.1µF ceramic capacitors.

Low Supply Current

The low supply current (typical 250uA per channel) of CBMLM358 family will help to

maximize battery life.

Operating Voltage

CBMLM358 family operates under wide input supply voltage (3V to 24V). In addition, all

temperature specifications apply from -25 ℃ to +80℃. Most behavior remains unchanged

throughout the full operating voltage range. These guarantees ensure

operation throughout the single Li-Ion battery lifetime

Capacitive Load Tolerance

The CBMLM358 family is optimized for bandwidth and speed, not for driving capacitive

loads. Output capacitance will create a pole in the amplifier’s feedback path, leading to

excessive peaking and potential oscillation. If dealing with load capacitance is a requirement of

the application, the two strategies to consider are (1) using a small resistor in series with the

amplifier’s output and the load capacitance and (2) reducing the bandwidth of the amplifier’s

feedback loop by increasing the overall noise gain. Figure 2. shows a unity gain follower using

the series resistor strategy. The resistor isolates the output from the capacitance and, more

importantly, creates a zero in the feedback path that compensates for the pole created by the

output capacitance.