Datasheet

MAX4409
80mW, DirectDrive, Stereo Headphone
Amplifier with Common-Mode Sense
8 _______________________________________________________________________________________
Pin Description
PIN NAME FUNCTION
18 COM Common-Mode Voltage Sense Input
19 PV
DD
Charge-Pump Power Supply. Powers charge-pump inverter, charge-pump logic, and oscillator.
1 C1P Flying Capacitor Positive Terminal
2 PGND Power Ground. Connect to SGND.
3 C1N Flying Capacitor Negative Terminal
5PV
SS
Charge-Pump Output
7SV
SS
Amplifier Negative Power Supply. Connect to PV
SS
.
9 OUTL Left-Channel Output
10 SV
DD
Amplifier Positive Power Supply. Connect to PV
DD
.
13 INL Left-Channel Audio Input
11 OUTR Right-Channel Output
14 SHDN Active-Low Shutdown. Connect to V
DD
for normal operation.
15 INR Right-Channel Audio Input
17 SGND Signal Ground. Connect to PGND.
4, 6, 8, 12,
16, 20
N.C. No Connection. Not internally connected.
— EP Exposed Pad. Leave unconnected. Do not connect to V
DD
or GND.
Typical Operating Characteristics (continued)
(C1 = C2 = 2.2µF, R
IN
= R
F
= R1 = R2 = 10kΩ, THD+N measurement bandwidth = 22Hz to 22kHz, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX4409 toc40
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
2.71.80.9
2
4
6
8
10
0
0 3.6
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX4409 toc41
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (μA)
2.71.80.9
2
4
6
8
10
0
03.6
SHDN = GND
POWER-UP/DOWN WAVEFORM
MAX4409 toc42
OUT_
OUT_FFT
V
DD
3V
20dB/div
10mV/div
0V
200ms/div
FFT: 25Hz/div
-100dB
R
L
= 32Ω, V
IN_
= GND