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| BU7150NUV Datasheet, PDF (11/17 Pages) Rohm – Headphone Amplifier Designed for 0.93V Low Voltage Operation | |||
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BU7150NUV
Technical Note
[Operation mode]
ã»Selecting operation mode
BU7150NUV has two OPAMP in the IC (Fig. 1). BU7150NUV is selected for BTL-mode for mono speaker and
single-ended mode for stereo headphone operation. Mode is composed of external parts and internal control (Fig. 34, 35)
BU7150NUV operates at single-ended mode when MODE pin (pin8) = 0V turn on. BTL mode is operated when MODE
pin (pin8) = VDD turn on. BYPASS voltage = 100mV then operation mode is decided by internal comparator by detecting
MODE voltage.
The difference between Single-ended mode and BTL-mode is mentioned in the following table.
Parameter
Mute function
Bypass voltage turn on time [Ts1, Tb1, Tb3]
(CBYPASS=4.7μF)
Time until Signal Output [Ts2, Tb2,
Tb4](CBYPASS=4.7μF)
Maximum Output Power (THD=1%)
Single ended mode
MODE='VSS'
enable
Ts1=2.82sec
Ts2=2.89sec
14mW
BTL mode
MODE='VDD'
disenable
Tb1=598msec
Tb3=256msec
Tb1=668msec
Tb3=326msec
85mW
Total Harmonic Distortion + Noise
0.10%
0.20%
Power Supply Rejection Ratio
(Ta=25â, VDD=1.5V, f=1kHz)
66dB
62dB
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
11/16
2011.05 - Rev.C
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