MAX5440 查看數據表（PDF） - Maxim Integrated

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MAX5440

Stereo Volume Control with Rotary Encoder Interface

Maxim Integrated 

MAX5440

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

Stereo Volume Control

with Rotary Encoder Interface

Balance Control

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

ance 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 3a). If channel 1 is at a higher attenuation than

channel 0, adjusting the balance to channel 1 moves

channel 1’s wiper up to the same wiper position as chan-

nel 0 before it was attenuated (Figure 3b).

Click-and-Pop Suppression

The click-and-pop suppression feature reduces the audi-

ble noise (clicks and pops) that results from wiper transi-

tions. The MAX5440 minimizes this noise by allowing

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

wiper has its own suppression and timeout circuitry. 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 channels

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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