max9744 Maxim Integrated Products, Inc., max9744 Datasheet - Page 11

• Manufacturer Part Number: max9744
• Description: 20w Stereo Class D Speaker Amplifier With Volume Control
• Manufacturer: Maxim Integrated Products, Inc.

(V
OUT_+ and OUT_- with an inductor in series, 8Ω load, L = 68µH, 4Ω load, L= 33µH. R
C
IN
PVDD
-100
-120
-20
-40
-60
-80
= 0.47µF, R
0
10
= 12V, V
V
IN
= 200mV
CROSSTALK vs. FREQUENCY
LEFT TO RIGHT
100
-100
-120
IN
-20
-40
-60
-80
DD
20
RMS
30
25
20
15
10
0
5
FREQUENCY (Hz)
= 20kΩ, R
3.0
RIGHT TO LEFT
0
= 3.3V, V
______________________________________________________________________________________
vs. VOLUME CONTROL VOLTAGE
1k
0.5
FILTERLESS MODULATION
VOLUME CONTROL LEVEL
3.2
SUPPLY CURRENT (V
20W Stereo Class D Speaker Amplifier
vs. SUPPLY VOLTAGE
1.0
F_
GND
SUPPLY VOLTAGE (V)
10k
= 20kΩ, spread-spectrum mode, T
3.4
1.5
PWM MODE
VOLUME CONTROL LEVEL
V
= V
VOL
(V)
PGND
2.0
100k
3.6
2.5
= 0V, V
DD
3.8
)
3.0
-100
Typical Operating Characteristics (continued)
-10
-20
-30
-40
-50
-60
-70
-80
-90
0
MUTE
-60
3.5
4.0
R
f = 1kHz
L
-50
RIGHT TO LEFT
= 8Ω
= 0V; max volume setting; all speaker load resistors connected between
CROSSTALK vs. AMPLITUDE
-40 -30
AMPLITUDE (dBV)
A
= +25°C, unless otherwise noted.)
-20 -10
LEFT TO RIGHT
with Volume Control
0
10
0.8
0.7
0.6
0.5
0.4
16
14
12
10
8
6
4
2
0
20
4
4
L
SHUTDOWN CURRENT = I
V
= ∞, unless otherwise stated, C
DD
= 3.3V
SUPPLY CURRENT (PVDD)
6
6
vs. SUPPLY VOLTAGE
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
PWM MODE
FILTERLESS MODULATION
8
8
TURN-ON/OFF RESPONSE
PVDD
10
10
100ms/div
+ I
DD
12
12
14
14
BIAS
MAX9744 toc43
= 2.2µF,
SHDN
2V/div
OUTPUT
11