max9744 Maxim Integrated Products, Inc., max9744 Datasheet - Page 12

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

20W Stereo Class D Speaker Amplifier
with Volume Control
12
7, 11, 12, 15, 27
6, 10, 21, 28
4, 5, 29, 30
______________________________________________________________________________________
PIN
2, 3
13
14
16
17
18
19
20
22
23
24
25
1
8
9
SCLK/PWM
SDA/VOL
BOOTL+
ADDR1
ADDR2
OUTL+
NAME
PVDD
SHDN
MUTE
SYNC
GND
BIAS
N.C.
V
FBR
FBL
INL
INR
DD
Left-Channel Positive Speaker Output Boost Flying-Capacitor Connection. Connect a 0.1µF
ceramic capacitor between BOOTL+ and OUTL+.
Left-Channel Speaker Output, Positive Phase
Speaker Amplifier Power-Supply Input. Bypass each with a 1µF capacitor to PGND.
Power-Supply Input. Bypass each with a 1µF capacitor to GND.
Ground
I
I
acts as I
output scheme, or set SCLK = 0 for filterless modulation output scheme.
Address Select Input 1. Sets device address for I
to GND to select analog volume control mode.
Address Select Input 2. Sets device address for I
to GND to select Analog Volume Control mode.
Left-Channel Audio Input
Left-Channel Feedback. Connect feedback resistor between FBL and INL to set amplifier gain. See
the Gain-Setting Resistors section.
Right-Channel Feedback. Connect feedback resistor between FBR and INR to set amplifier gain.
See the Gain-Setting Resistors section.
Right-Channel Input
Common-Mode Bias Voltage. Bypass with a 2.2µF capacitor to GND.
Shutdown Input. Drive SHDN low to disable the audio amplifiers. Connect SHDN to V
high for normal operation.
No Connection. Not internally connected.
Mute Input. Drive MUTE high to mute the speaker outputs. Connect MUTE to GND for normal
operation (mute function controls speaker outputs only).
Frequency Select and External Clock Input.
SYNC = GND: Fixed-frequency mode with f
SYNC = Unconnected: Fixed-frequency mode with f
SYNC = V
SYNC = Clocked: Fixed-frequency mode with f
value of f
2
2
C Serial Data I/O and Analog Volume Control Input
C Serial Clock Input and Modulation Scheme Select. In I
2
SYNC
C serial clock input. When ADDR1 and ADDR2 = GND, set SCLK = 1 for standard PWM
DD
: Spread-spectrum mode with f
.
SYNC
SYNC
FUNCTION
SYNC
2
2
= 1200kHz
= 1200kHz ±30kHz
C address option. Connect ADDR1 and ADDR2
C address option. Connect ADDR1 and ADDR2
SYNC
= external clock frequency. f
= 1440kHz
2
C mode (ADDR1 and ADDR2 ≠ GND),
Pin Description
SW
DD
= 1/4 the
or drive