MAX5486EUG+T Maxim Integrated Products, MAX5486EUG+T Datasheet - Page 8

• Manufacturer Part Number: MAX5486EUG+T
• Description: IC CNTRL VOL STEREO 24TSSOP
• Manufacturer: Maxim Integrated Products
• Type: Stereo Audio Volume Controlr

Specifications of MAX5486EUG+T

• Applications: Automotive Systems, Desktop Audio, Set-Top Boxes
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX5486 dual 40kΩ logarithmic taper digital vol-
ume control features a debounced pushbutton interface
that controls volume and balance in audio applications.
Each potentiometer has 32 log-spaced tap points with
a buffered wiper output and replaces mechanical
potentiometers.
The MAX5486 MODE input toggles between volume
and balance modes. Each time MODE is forced low,
the device switches between volume and balance
modes. For example, driving MODE low once while in
volume-control mode switches the MAX5486 to balance
mode. Driving MODE low again switches the MAX5486
back to volume mode. MODE is internally pulled high
with a resistor to V
volume-control mode. Leave unconnected or connect
to V
The MAX5486 interfaces with momentary contact SPST
switches. All switch inputs are internally debounced and
pulled up to V
advances once per button press up to 250ms. Maxim’s
SmartWiper control circuitry allows the wiper to advance
at a 4Hz rate after holding the button for approximately
250ms. After 500ms, the wiper moves at an 8Hz rate.
After 1s, the rate increases to 11Hz (see Table 2). The
SmartWiper control eliminates the need for a microcom-
puter to increase the wiper transition rate.
The MAX5486 MODE input toggles the part between vol-
ume and balance-control modes. The UP/BALL and
DN/BALR inputs control the wiper according to the
selected mode. MODE is internally pulled high with a
resistor to V
In volume-control mode, the MAX5486’s wipers move
simultaneously, maintaining the balance separation
between each wiper (Figure 2a).
When either wiper reaches the maximum tap position
(position closest to H_), further commands to increase
the volume are ignored. Balance separation is main-
tained in the maximum volume configuration (Figure 2b).
When either wiper reaches the minimum tap position
(position closest to L_), further commands to decrease
the volume adjust the other wiper until it also reaches
the minimum tap position (Figure 2c). Increasing the
volume from this minimum position restores the original
balance separation of the wipers (Figure 2d).
Stereo Volume Control with Pushbutton
Interface
8
8
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LOGIC
if balance mode is not required.
LOGIC
LOGIC
.
LOGIC
through resistors. The wiper setting
Mode Control ( MODE )
Detailed Description
. The MAX5486 powers up in
Up-and-Down Interface
Volume Control
Figure 1. Pushbutton Interface
Table 1. Wiper Position and Attenuation
Table 2. Wiper Action vs. Pushbutton
Contact Duration
t ≤ 16ms
16ms < t ≤ 250ms
250ms < t ≤ 500ms
500ms < t ≤ 1000ms
t > 1000 ms
CONTACT DURATION
MOMENTARY
CONTACT
SPST
PUSHBUTTONS
POSITION
32 (mute)
30
31
0
1
2
3
4
M
No motion.
Wiper changes position once.
SmartWiper begins. Wiper
changes position at a rate of 4Hz.
Wiper changes position at a rate
of 8Hz.
Wiper changes position at a rate
of 11Hz.
DN
UP
ATTENUATION (dB)
WIPER ACTION
> 90
60
62
GND
V
0
2
4
6
8
M
LOGIC
MAX5486