BH7881EFV_05 Datasheet, PDF (1/9 Pages) Rohm – 2W + 2W Stereo Speaker / Headphone Amplifier

TECHNICAL NOTE
Speaker / Headphone Amplifier Series
2W + 2W Stereo Speaker /
Headphone Amplifier
BH7881EFV
●Description
The BH7881EFV is a low voltage, low noise, high output speaker/headphone amplifier IC, in which a BiCMOS process is used.
An on-chip speaker amplifier circuit that is capable of 2W+2W output can be used as a headphone amplifier by switching the
operating mode. This makes it possible to configure an audio system using few external devices.
With a built-in, low saturation regulator with programmable output voltage and output current, clear tone quality is obtained
even when directly connected to a digital power supply. A peripheral analog circuit can also be regulator driven. Furthermore,
the BH7881EFV provides speaker output and VREG output short-circuit detection functions, a thermal shutdown function with
hysteresis, and a speaker protection function.
●Features
1) Built-in low saturation type regulator (Digital power supply driver, voltage and current variable, short circuit detection)
2) Bass boost mode, gain switching functions
3) Speaker MUTE function (Headphone mode)
4) Built-in line amplifier output (gain adjustment, LPF setting) active/suspend function (TTL input control pin)
5) Hysteretic thermal shutdown function (Set for approximately 150°C /90°C)
6) IC protection function (SP pin VCC/GND short circuit detection)
7) Speaker protection function (Output voltage amplitude control)
●Applications
Notebook computers, LCD TVs, etc.
●Absolute maximum ratings (Ta=25°C)
Parameter
Limits
Unit
Supply voltage
+6.0
Ｖ
Power dissipation
1100 ^*1
mW
Storage temperature
-55～+125
°C
Operating temperature
-10～+70
°C
*1 Reduced by 11 mW/C at 25C or higher, when mounting on a 70mmX70mmX1.6mm PCB board).
●Operating range (Ta=25°C)
Parameter
Supply voltage
Limit
Unit
+3.3～+5.5
V
* This IC is not designed to be radiation-resistant.
Oct. 2005