80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
Typical Operating Characteristics (continued)
(C1 = C2 = 2.2µF, THD+N measurement bandwidth = 22Hz to 22kHz, TA = +25°C, unless otherwise noted.)
SHDNR
OUTR
EXITING SHUTDOWN
MAX4411 toc40
2V/div
500mV/div
POWER-UP/DOWN WAVEFORM
MAX4411 toc41
3V
VDD
0V
OUT_
-100dB
10mV/div
OUT_FFT
20dB/div
fIN = 1kHz
RL = 32Ω
SHDNL = GND
200μs/div
RL = 32Ω
VIN_ = GND
200ms/div
FFT: 25Hz/div
PIN
QFN
1
2
3
4, 6, 8, 12,
16, 20
5
7
9
10
11
13
14
15
17
18
19
BUMP
UCSP
A4
B4
C4
—
D4
D3
D2
D1
C2
C1
B1
A1
A2
B2
A3
—
—
Pin Description
NAME
C1P
PGND
C1N
N.C.
PVSS
SVSS
OUTL
SVDD
OUTR
INL
SHDNR
INR
SGND
SHDNL
PVDD
EP
FUNCTION
Flying Capacitor Positive Terminal
Power Ground. Connect to ground (0V).
Flying Capacitor Negative Terminal
No Connection. Not internally connected.
Charge-Pump Output
Amplifier Negative Power Supply. Connect to PVSS.
Left-Channel Output
Amplifier Positive Power Supply. Connect to positive supply (1.8V to 3.6V).
Right-Channel Output
Left-Channel Audio Input
Active-Low Right-Channel Shutdown. Connect to VDD for normal operation.
Right-Channel Audio Input
Signal Ground. Connect to ground (0V).
Active-Low Left-Channel Shutdown. Connect to VDD for normal operation.
Charge-Pump Power Supply. Powers charge-pump inverter, charge-pump logic, and
oscillator. Connect to positive supply (1.8V to 3.6V).
Exposed Paddle. Leave unconnected. Do not connect to any voltage including
GND or VDD.
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