Rainbow-electronics MAX5457 Bedienungsanleitung PDF herunterladen (Seite 9)

MAX5456/MAX5457

Stereo Audio Taper Potentiometers

with Pushbutton Interface

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Balance Control

In balance-control mode, the MAX5456/MAX5457

adjust the balance between channel 0 and channel 1

while maintaining the set volume. For example, if the

volume of channel 0 equals the volume of channel 1,

forcing the balance towards channel 1 increases the

attenuation of channel 0 (Figure 4a). If channel 1 is at a

higher attenuation than channel 0, adjusting the bal-

ance to channel 1 moves channel 1’s wiper up to the

same wiper position as channel 0 before attenuating

channel 0 (Figure 4b).

To control the wiper quickly with a logic signal, main-

tain pulses at least 22.5ms wide and separated by at

least 40ms.

Table 2. Wiper Action vs. Pushbutton

Contact Duration

CONTACT DURATION WIPER ACTION

t < 22.5ms No motion (debouncing).

22.5ms < t ≤ 1s Wiper changes position once.

1s < t ≤ 4s

Wiper changes position

at a rate of 4Hz.

t > 4s

Wiper changes position

at a rate of 16Hz.

(a)

W0W1 W1

W0 W1

W0W1 W1

(b)

VOLUME LEVEL IS SET

VOLUME LEVEL MAINTAINED

BALANCE SHIFTS TO W1

VOLUME LEVEL MAINTAINED

BALANCE SHIFTS TO W1VOLUME LEVEL IS SET BY W0

PRESS BAL1

ONCE

PRESS BAL1

ONCE

PRESS BAL1

ONCE

PRESS BAL1

ONCE

Figure 4. Balance-Control Operation

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 19 20

MAX5456/MAX5457 1

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