MAX5440(2006) データシートの表示（PDF） - Maxim Integrated

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MAX5440
(Rev.:2006)

Stereo Volume Control with Rotary Encoder Interface

Maxim Integrated 

Stereo Volume Control

with Rotary Encoder Interface

Table 1. Wiper Position and Attenuation

POSITION

0

1

2

…

6 (POR)

…

30

31

32 (MUTE)

ATTENUATION (dB)

0

-2

-4

…

-12

…

-60

-62

≥ 90

Balance Control

In balance-control mode, the MAX5440 adjusts the bal-

ance between channel 0 and channel 1 while maintain-

ing 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 3a). If channel 1 is at a higher attenu-

ation than channel 0, adjusting the balance to channel

1 moves channel 1’s wiper up to the same wiper posi-

tion as channel 0 before it was attenuated (Figure 3b).

Click-and-Pop Suppression

The click-and-pop suppression feature reduces the

audible noise (clicks and pops) that results from wiper

transitions. The MAX5440 minimizes this noise by allow-

ing the wiper to change position only when VH = VL.

Each wiper has its own suppression and timeout cir-

cuitry. The MAX5440 changes wiper position when VH

= VL, or after 32ms, whichever occurs first (see Figures

4a and 4b).

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.

VOLUME LEVEL IS SET

H_

W0

W1

W0

ROTATE CW

ONCE

W1

ROTATE CW

ONCE

VOLUME LEVEL MAINTAINED

BALANCE SHIFTS TO W1

W0

W1

L_

VOLUME LEVEL IS SET BY W0

H_

W0

W1

W0

ROTATE CW

ONCE

W1

ROTATE CW

ONCE

VOLUME LEVEL MAINTAINED

BALANCE SHIFTS TO W1

W0

W1

L_

Figure 3. Balance-Control Operation

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