BD5461GUL Rohm, BD5461GUL Datasheet - Page 8

• Manufacturer Part Number: BD5461GUL
• Description: Analog Input Monaural Class-D Speaker Amplifier
• Manufacturer: Rohm

●The way of evaluating Audio characteristic
© 2010 ROHM Co., Ltd. All rights reserved.
BD5461GUL
www.rohm.com
Evaluation Circuit Diagram
When measuring Audio characteristics, insert LC filter during the output terminal of IC and the speaker load and measure it.
Arrange LC filter as close as possible to the output terminal of IC.
In case of L=22μH, C=1μF, the cutoff frequency becomes the following.
Use a big current type - Inductor L.
(Reference)
fc

2
Differential
Input
π
TDK: SLF12575T-220M4R0
1
LC

H：Active
L：Shutdown
Audio
Input+
Audio
Input-
2
π
22
1
VDD
μH
0.1μ
0.1μ
C2
C1

1
μF
STBY
IN+
IN-
C1
C2
A1

34
Ri=75k
Ri=75k
kHz
300k
Bias
GND
VDD
A2
B1
PWM
OSC
VDD
8/16
0.1μ
C3
B3
B2
PVDD
PGND
H-
Bridge
10μ
C4
A3
C3
OUT-
OUT+
22μH
22μH
1μF
1μF
RL=Speaker Load
R
L
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Technical Note
2010.06 - Rev.A
Measument Instrumen
-
+
Audio
Precision
etc