Datasheet

Table 3 shows the LED display as the wipers transition
through various attenuation levels.
A PWM circuit interpolates the high-resolution 32 steps
between the five LEDs over the volume range from 0dB
to -54dB. This feature provides visible indication for the
attenuation levels from 0dB to -54dB. For example, LED4
brightness level decreases progressively with each -2dB
step from 0dB to -8dB. PWM is disabled in the range
-56dB to mute.
In balance-control mode, only one LED is on at a time to
indicate the current balance setting. Figure 5 shows the
LEDs display for the current balance setting. When LED2
is on, the display indicates that the channels are centered
or balanced at a set volume level. When LED4 turns on,
the balance shifts completely toward the right channel
and the left channel becomes fully attenuated.
Multiple Button Pushes
The MAX5486 does not respond to simultaneous button
pushes. Additionally, a 16ms blocking period affects all
other inputs when releasing any input that was forced low.
The MAX5486 does not respond to any logic input until
the blocking period ends. If multiple-control buttons are
pressed, all wiper-control connections must be released
before the device responds to further commands.
Applications Information
The Typical Operating Circuit shows a typical volume/
balance application circuit using the MAX5486 in a sin-
gle-supply configuration. The internally generated BIAS
voltage eliminates the need for external op amps, and
the wipers have internal low-power buffers for low distor-
tion. Connect the W_ outputs of the MAX5486 to the left
and right inputs of a stereo audio amplifier, such as the
MAX9761. The pushbutton potentiometers attenuate the
input signals. Use the MODE input to switch between
volume-control and balance-control modes.
Table 3. LED Settings in Volume Mode
VOLUME POSITION
WIPER ACTION
LED0 LED1 LED2 LED3 LED4
0dB to -8dB 1 1 1 1 1
-10dB to -18dB 1 1 1 1 0
-20dB to -28dB 1 1 1 0 0
-30dB to -38dB 1 1 0 0 0
-40dB to -52dB 1 0 0 0 0
-54dB to mute (-90dB) 0 0 0 0 0
MAX5486 Stereo Volume Control with Pushbutton
Interface
www.maximintegrated.com
Maxim Integrated │ 11