MAX5457 Maxim Integrated Products, MAX5457 Datasheet - Page 11

• Manufacturer Part Number: MAX5457
• Description: Stereo Audio Taper Potentiometers
• Manufacturer: Maxim Integrated Products

Upon entering shutdown mode, the MAX5456/MAX5457
store the last wiper settings. The wipers move to the L_
end of the resistor string, and the H_ end of the resistor
string disconnects from the signal input. Terminating
shutdown mode restores the wipers to their previous
settings (see Figure 2). Shutdown does not affect the
state of MODE_IND.
The MAX5456/MAX5457 feature a mute function. Success-
ive pulses on MUTE toggle its setting. Activating the mute
Figure 5b. Wiper Transition Timing Diagram
______________________________________________________________________________________
1
0
Mute Function, MUTE
V
V
H
L
Stereo Audio Taper Potentiometers
IS BOUNCING
CONTACT
SWITCH
Shutdown,
DEBOUNCE BY
WAITING FOR
STABLE LOW,
IS STABLE
CONTACT
SWITCH
t
t
IPW
IPW
(t
IPW
SHDN
+ t
CROSSING OR
TIMEOUT, t
WS
FIRST ZERO
WAIT FOR
INPUT ACCEPTED
)
with Pushbutton Interface
t
WS
WS
function forces both wipers to maximum attenuation (-
90dB typ). Deactivating the mute function returns the
wipers to their previous settings. Pressing VOLUP also
deactivates mute, setting the wipers to their previous
positions. MUTE is internally pulled high with a 50kΩ
resistor to VLOGIC. When both wipers are in the 31st
tap position (-62dB attenuation), further commands to
VOLDN place the wipers in the mute position (see
Table 1). VOLUP or MUTE pulses return the wipers to
position 31.
WIPER MOVES HERE
IS BOUNCING
CONTACT
SWITCH
STABLE HIGH, t
2dB
STEPS
DEBOUNCE BY
WAITING FOR
t
HPW
HPW
READY TO ACCEPT
ANOTHER KEYPRESS
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