Datasheet
Figure 6. Fully Differential Crossover Filters
BIAS
2
3
1
C1
47nF
R3
28kΩ
R2, 56.2kΩ
R1
56.2kΩ
C2
47nF
MAX4478
U1A
BIAS
6
5
7
C3
47nF
R7
28kΩ
R6, 56.2kΩ
RIGHT
AUDIO
OUTPUT
RIGHT
AUDIO
INPUT
R5
56.2kΩ
R4
28kΩ
C4
47nF
MAX4478
U1B
BIAS
9
10
8
C5
47nF
R10
28kΩ
R9, 56.2kΩ
R8
56.2kΩ
C6
47nF
MAX4478
U1C
BIAS
13
12
14
C7
47nF
R14
28kΩ
R13, 56.2kΩ
LEFT
AUDIO
OUTPUT
SUBWOOFER OUTPUT IS
AC-COUPLED TO A
MAX9709 CONFIGURED AS
A MONO AMPLIFIER
NOTE:
OP AMP POWER PINS OMITTED FOR CLARITY.
ALL RESISTORS ARE 1% OR BETTER.
ALL CAPACITORS ARE 5% OR BETTER.
RIGHT AND LEFT OUTPUTS
ARE AC-COUPLED TO A
MAX9709 CONFIGURED AS
A STEREO AMPLIFIER
SUBWOOFER
AUDIO
OUTPUT
LEFT
AUDIO
INPUT
R12
56.2kΩ
R11
28kΩ
C8
47nF
MAX4478
U1D
BIAS
2
3
1
R17
26.1kΩ
R15
26.1kΩ
MAX4478
U2A
R16
13kΩ
C9, 47nF
C10
47nF
R18
7.5kΩ
BIAS
6
5
7
R21
28kΩ
R19
26.1kΩ
MAX4478
U2B
R20
13kΩ
C11, 47nF
R22
7.5kΩ
MAX9709 25W/50W, Filterless, Spread-Spectrum,
Stereo/Mono, Class D Amplier
www.maximintegrated.com
Maxim Integrated
│
18