Datasheet

When both wipers are in the tap 31 position (-62dB atten-
uation), further commands to DN/BALR place the wipers
in the mute position (see Table 1). UP/BALL or MUTE
pulses return the wipers to tap 31.
Balance Control
In balance-control mode, the MAX5486 adjusts the bal-
ance between the right and left channels while maintain-
ing the set volume. For example, if the volume of the right
channel equals the volume of the left channel, forcing the
balance towards the left channel increases the attenua-
tion of the right channel (Figure 3a). If the left channel is at
a higher attenuation than the right channel, adjusting the
balance to the left channel moves the left channel’s wiper
up to the same wiper position as the right channel 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 MAX5486 minimizes this noise by allowing the
wiper to change position only when V
H
= V
L
(zero cross-
ing) or after the zero crossing timeout (126ms). Each
wiper has its own suppression and timeout circuitry. The
MAX5486 changes wiper position when V
H
= V
L
, 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
Figures 2a–2d. Volume-Control Operation
WR
H_
H_
H_
H_
L_
L_
WL
WR
WRWL WL
PRESS UP
TWICE
PRESS DN
ONCE
NO CHANGE
WR WL
WR
WRWL WL
PRESS UP
ONCE
PRESS UP
ONCE
WR WL
WR
WRWL WL
PRESS DN
ONCE
PRESS DN
ONCE
WR WL
WR
WRWL WL
PRESS UP
ONCE
PRESS UP
ONCE
BALANCE SEPARATION
MAINTAINED
ORIGINAL BALANCE SEPARATION
MAINTAINED
TO 2d
FROM 2c
L_
L_
(2a)
(2b)
(2c)
(2d)
MAX5486 Stereo Volume Control with Pushbutton
Interface
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