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10 Power Supply Recommendations

For fast response and comparison applications with noisy or AC inputs, TI recommends to use a bypass

capacitor on the supply pin to reject any variation on the supply voltage. This variation can eat into the input

common-mode range of the comparator and create an inaccurate comparison.

11 Layout

11.1 Layout Guidelines

For accurate comparator applications without hysteresis it is important maintain a stable power supply with

minimized noise and glitches. To achieve this, it is best to add a bypass capacitor between the supply voltage

and ground. This should be implemented on the positive power supply and negative supply (if available). If a

negative supply is not being used, do not put a capacitor between the IC's GND pin and system ground.

Minimize coupling between outputs and inverting inputs to prevent output oscillations. Do not run output and

inverting input traces in parallel unless there is a VCC or GND trace between output and inverting input traces to

reduce coupling. When series resistance is added to inputs, place resistor close to the device.

11.2 Layout Example

VCC

Ground

1IN-

1IN+

GND

2OUT

2IN-

2IN+

1OUT

VCC

VCC or GND

Better

Input Resistors

Close to device

Figure 11-1. LM2903 Layout Example

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LM393B, LM2903B, LM193, LM293, LM293A, LM393, LM393A, LM2903, LM2903V

SLCS005AD – OCTOBER 1979 – REVISED OCTOBER 2020

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LM393D Folha de dados(PDF) 23 Page - Texas Instruments