Rainbow-electronics MAX5457 Manual do Utilizador descarregar pdf (Página 10)

MAX5456/MAX5457

Stereo Audio Taper Potentiometers

with Pushbutton Interface

10 ______________________________________________________________________________________

Click/Pop Suppression

The click/pop suppression feature reduces the audible

noise (clicks and pops) that result from wiper transitions.

The MAX5456/MAX5457 minimize this noise by allowing

the wiper position changes only when V

= V

. Thus,

the wiper changes position only when the voltage at L_ is

the same as the voltage at the corresponding H_. Each

wiper has its own suppression and timeout circuitry (see

Figure 5a). The MAX5456/MAX5457 change wiper posi-

tion after 32ms or when V

= V

, whichever occurs first

(see Figure 5b).

The suppression circuitry monitors left and right chan-

nels separately. In volume-control mode, when the first

wiper changes position, the second wiper has 32ms to

change or it will be forced to change.

Power-On Reset

The power-on comparators monitor V

- V

and

LOGIC

- GND. A power-on reset is initiated when either

of the supplies is brought back to normal operating

voltage. The power-on-reset feature sets both wipers to

-12dB. Power-on reset places the MAX5457 in volume-

control mode.

DN OR UP

USER PRESSES PUSHBUTTON

SWITCH

CONTACT

IS BOUNCING

SWITCH

CONTACT

IS STABLE

SWITCH

CONTACT

IS BOUNCING

READY TO ACCEPT

ANOTHER KEYPRESS

INPUT ACCEPTED

IPW

HPW

DEBOUNCE BY

WAITING FOR

STABLE LOW, t

IPW

WAIT FOR

FIRST ZERO

CROSSING, t

DEBOUNCE BY

WAITING FOR

STABLE HIGH, t

HPW

WIPER MOTION

WIPER MOVES HERE

2dB

STEPS

Figure 5a. Wiper Transition Timing Diagram

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 19 20

MAX5456/MAX5457 1

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