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參數(shù)資料
MAX5440
Stereo Volume Control
with Rotary Encoder Interface
6
_______________________________________________________________________________________
PIN
NAME
FUNCTION
1VLOGIC
Digital Logic Power Supply. Bypass VLOGIC to ground with a 0.1F capacitor as close to the device
as possible.
2
RENCODEB
Rotary Encoder Input B. With RENCODEA, this input provides the rotary encoder control for the
potentiometer (see Figure 1). RENCODEB is internally pulled up to VLOGIC with a 45k
resistor.
3
RENCODEA
Rotary Encoder Input A. With RENCODEB, this input provides the rotary encoder control for the
potentiometer (see Figure 1). RENCODEA is internally pulled up to VLOGIC with a 45k
resistor.
4
MUTE
Mute Input. Pull MUTE low to toggle the wiper between the mute setting (see Table 1) and the current
setting. MUTE is pulled up to VLOGIC with an internal 45k
resistor.
5
MODE
Volume/Balance Control Input. Each high-to-low transition on MODE toggles between the volume and
balance modes. MODE is pulled high internally with a 45k
resistor to VLOGIC. On power-up, the
MAX5440 is in volume-control mode.
6
SHDN
Active-Low Shutdown Input. Drive SHDN low to place the device in shutdown mode. In shutdown
mode, the MAX5440 stores the last wipers settings. The wipers move to the L_ end of the resistor
string. Terminating shutdown mode restores the wipers to their previous settings.
7, 24
GND
Ground. Connect pins 7 and 24 together.
8
H0
Potentiometer 0 High Terminal. H0 and L0 terminals can be reversed.
9
L0
Potentiometer 0 Low Terminal. L0 and H0 terminals can be reversed.
10
W0
Potentiometer 0 Wiper Buffered Output
11
MIDBIAS
Midbias Voltage Output. VMIDBIAS = (VDD + VSS) / 2.
12
BIAS
Bias Generator Input. Bypass with a 1F capacitor to system ground.
13
VDD
Analog Power Supply. Bypass VDD to ground with a 0.1F capacitor as close to the device as
possible.
14
VSS
Negative Power Supply. Bypass VSS to ground with a 0.1F capacitor as close to the device as
possible. Connect to GND for single-supply operation.
15
W1
Potentiometer 1 Wiper Buffered Output
16
L1
Potentiometer 1 Low Terminal. L1 and H1 terminals can be reversed.
17
H1
Potentiometer 1 High Terminal. H1 and L1 terminals can be reversed.
18–22
LEDIND0–
LEDIND4
LED Indicator Open-Drain Output 0 through LED Indicator Open-Drain Output 4. LEDIND0–LEDIND4 form a
bar graph indication of the current volume or balance. In volume mode, all LEDs off indicates mute and all
LEDs on indicates maximum volume. In balanced mode, LED2 on indicates centered or balanced.
23
MODEIND
Volume-Control/Balance-Control Mode Indicator Open-Drain Output. Connect to an LED through a
resistor to VLOGIC. When the LED is on, the MAX5440 is in balance-control mode. When the LED is
off, the MAX5440 is in volume-control mode.
Pin Description
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