Datasheet

MAX4411
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
8 _______________________________________________________________________________________
Pin Description
PIN BUMP
QFN UCSP
NAME FUNCTION
1 A4 C1P Flying Capacitor Positive Terminal
2 B4 PGND Power Ground. Connect to ground (0V).
3 C4 C1N Flying Capacitor Negative Terminal
4, 6, 8, 12,
16, 20
— N.C. No Connection. Not internally connected.
5D4PV
SS
Charge-Pump Output
7D3SV
SS
Amplifier Negative Power Supply. Connect to PV
SS
.
9 D2 OUTL Left-Channel Output
10 D1 SV
DD
Amplifier Positive Power Supply. Connect to positive supply (1.8V to 3.6V).
11 C2 OUTR Right-Channel Output
13 C1 INL Left-Channel Audio Input
14 B1 SHDNR Active-Low Right-Channel Shutdown. Connect to V
DD
for normal operation.
15 A1 INR Right-Channel Audio Input
17 A2 SGND Signal Ground. Connect to ground (0V).
18 B2 SHDNL Active-Low Left-Channel Shutdown. Connect to V
DD
for normal operation.
19 A3 PV
DD
Charge-Pump Power Supply. Powers charge-pump inverter, charge-pump logic, and
oscillator. Connect to positive supply (1.8V to 3.6V).
—— EP
Exposed Paddle. Leave unconnected. Do not connect to any voltage including
GND or V
DD
.
POWER-UP/DOWN WAVEFORM
MAX4411 toc41
OUT_
OUT_FFT
V
DD
3V
20dB/div
10mV/div
0V
200ms/div
FFT: 25Hz/div
-100dB
R
L
= 32Ω
V
IN_
= GND
Typical Operating Characteristics (continued)
(
C1 = C2 = 2.2µF, THD+N measurement bandwidth = 22Hz to 22kHz, T
A
= +25°C, unless otherwise noted.
)
EXITING SHUTDOWN
MAX4411 toc40
OUTR
SHDNR
2V/div
500mV/div
200μs/div
f
IN
= 1kHz
R
L
= 32Ω
SHDNL = GND