Rainbow Electronics MAX5440 - Manual (Page 14)

MAX5440
Multiple Button Pushes (
MODE
,
MUTE
)
The MAX5440 does not respond to simultaneous button
pushes. Pushing more than one button at the same
time stops the wipers in their present states. Only a sin-
gle button push configures the device.
Applications Information
Typical Application Circuit
The Typical Operating Circuit shows the MAX5440 in a
typical volume/balance application using a single-sup-
ply configuration. Figure 6 shows a typical volume/bal-
ance application circuit using the MAX5440 in a
dual-supply configuration. The MAX5440 does not
require external op amps because the bias is generat-
ed internally, and the wipers have internal low-power
buffers for low distortion. Connect the W_ outputs of the
MAX5440 to the left and right inputs of a stereo audio
amplifier, such as the MAX9761. The rotary encoder
controls the potentiometer attenuation levels without
using a microcontroller. Use the MODE input to switch
between volume-control and balance-control modes.
Chip Information
PROCESS: BiCMOS
Stereo Volume Control
with Rotary Encoder Interface
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