wiper changes position, the second wiper has 126ms

to change or it changes automatically.

Power-On Reset

either of the supplies is brought back to the normal

operating voltage. The power-on reset feature sets both

wipers to -12dB. The wipers initially wake up in mute

mode (-90dB) and move to the -12dB position when

exceeding the timeout period. A power-on reset places

the MAX5486 in volume-control mode.

Shutdown (

SHDN)

Upon entering shutdown, the MAX5486 stores the last

wiper settings. The wipers move to the L_ end of the

the wipers move after exceeding the timeout period.

Exiting shutdown restores the wipers to their previous

settings. Shutdown also turns off all the LED indicators

to save power.

Mute Function (

MUTE)

The MAX5486 features a mute function input, MUTE.

Successive low pulses on MUTE toggle its setting.

Activating the mute function forces both wipers to maxi-

mum attenuation (-90dB typ). Deactivating the mute

function returns the wipers to their previous settings.

When both wipers are in the tap 31 position

(-62dB attenuation) further commands to lower the vol-

ume place the wipers in the mute position (see Table 1).

Mode Indicator (

MODEIND)

The open-drain MODEIND indicates volume-control

mode or balance-control mode for the MAX5486.

Connect MODEIND to an LED with a series resistor to

ance-control mode. When the LED is off, the MAX5486

is in volume-control mode. See the

Mode Control

(MODE) section for more detail on switching between

modes.

Level Indicator LEDs

The MAX5486 includes five indicator LED drivers to dis-

play the current wiper settings in either volume or bal-

ance mode. The LED indicators are enabled by

connecting a 1M

Ω resistor between LEDIND4 and

Typical Operating Circuit. Connect LEDIND_ outputs to

GND when LED indicator drivers are not used.

In volume-control mode, all LEDs are off when the

wipers reach the highest attenuation levels (mute). All

LEDs are on at the lowest attenuation levels (0dB).

Stereo Volume Control with Pushbutton

Interface

10

______________________________________________________________________________________

(3a)

WR

H_

L_

H_

L_

WL

WR

WR

WL

WL

WR

WL

WR

WR

WL

WL

(3b)

VOLUME LEVEL IS SET

VOLUME LEVEL MAINTAINED

BALANCE SHIFTS TO WL

VOLUME LEVEL MAINTAINED

BALANCE SHIFTS TO WL

VOLUME LEVEL IS SET BY WR

PRESS BALL

ONCE

PRESS BALL

ONCE

PRESS BALL

ONCE

PRESS BALL

ONCE

Figures 3a and 3b. Balance-Control Operation