MAX9720 Maxim, MAX9720 Datasheet - Page 9

• Manufacturer Part Number: MAX9720
• Description: 50mW / DirectDrive / Stereo Headphone Amplifier with SmartSense and Shutdown
• Manufacturer: Maxim

-100
-110
-120
-10
-20
-30
-40
-50
-60
-70
-80
-90
60
50
40
30
20
10
0
9
8
7
6
5
4
3
2
1
0
0
(V
1.8
10
10
OUTPUT POWER vs. LOAD RESISTANCE
AND CHARGE-PUMP CAPACITOR SIZE
2.2µF
DD
V
R
V
f
THD+N = 1%
OUTPUTS
IN PHASE
IN
DD
L
IN
= 32Ω
= 1kHz
RIGHT-TO-LEFT
CHANNEL
SHUTDOWN SUPPLY CURRENT
= 200mV
CROSSTALK vs. FREQUENCY
= 1.8V
2.1
= 3V, THD+N bandwidth = 22Hz to 22kHz, MODE1 = MODE2 = V
1µF
100
20
vs. SUPPLY VOLTAGE
LOAD RESISTANCE (Ω)
SUPPLY VOLTAGE (V)
P-P
2.4
0.47µF
FREQUENCY (Hz)
LEFT-TO-RIGHT
CHANNEL
2.7
30
1k
Amplifier with SmartSense and Shutdown
_______________________________________________________________________________________
3.0
10k
40
50mW, DirectDrive, Stereo Headphone
3.3
100k
3.6
50
MODE1 AND
MODE2
OUT_
-100
-120
-20
-40
-60
-80
-1
-2
-3
-4
-5
0
5
4
3
2
1
0
0.01
100
A
OUTPUT SPECTRUM vs. FREQUENCY
f
R
V
IN
Typical Operating Characteristics (continued)
L
GAIN FLATNESS vs. FREQUENCY
= -1V/V
= 1kHz
= 32Ω
0.1
EXITING SHUTDOWN
1k
1
FREQUENCY (Hz)
FREQUENCY (Hz)
400µs/div
10
100
10k
DD
V
R
f
IN
IN
L
MAX9720 toc53
= 32Ω
= 1kHz
1k
= 1V
.)
P-P
100k
10k
3V
0V
500mV/div
OUT_FFT
OUT_
V
14
12
10
DD
8
6
4
2
0
6
5
4
3
2
1
0
1.8
1.8
SUPPLY CURRENT vs. SUPPLY VOLTAGE
CHARGE-PUMP OUTPUT IMPEDANCE
V
R
STEREO MODE
IN
L
100dB
= 32Ω
POWER-UP/DOWN WAVEFORM
MONO MODE
= GND
2.1
2.1
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
2.4
2.4
FFT: 25Hz/div
200ms/div
2.7
2.7
3.0
3.0
I
LOAD
3.3
MAX9720 toc54
= 10mA
3.3
3.6
3.6
10mV/div
20dB/div
9
3V
0V