Frequently Asked Questions |ROHM Semiconductor

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For Headphone Amplifiers,
What types of ROHM Headphone Amplifiers are available?
- BD882□□GUL series, BD884□□GUL series and BD88400FJ are output coupling capacitor-less type.
  BU7150NUV can be operated at ultra low supply voltage of 0.93V.
  BH354xF are general bias output type.

For Headphone Amplifiers,
Is there a Headphone Amplifier with variable gain?
- These are the BD88200GUL, BD88400GUL, and BD88400FJ with output coupling capacitor-less and BU7150NUV with ultra-low voltage operation.

For Headphone Amplifiers,
Is there a recommended value for an external resistor for a variable gain type Headphone Amplifier?
- The recommended resistor values are shown in the application circuit examples in the datasheet.
  For BD88200GUL, BD88400GUL, and BD88400FJ, the recommended values are 10kΩ input resistor and 10kΩ feedback resistor.
  For BU7150NUV, the recommended values are 20kΩ input resistor and 20kΩ feedback resistor.

For Headphone Amplifiers,
Are there any products in plastic mold packages?
- Standard type BH3544F, BH3547F, BH3548F,
  Output coupling capacitor less type BD88400FJ,
  Low voltage drive type BU7150NUV is available.

What is BTL output method?
- It is the abbreviation of Bridge Tied Load.
  It reverses the speaker both terminals to connect by using two amplifier circuits compared with a usual single amplifier. If without output coupling capacitor,it may has an advantage that output electric power quadruples.

Is the input form a differential input type? Is it a single input type?
- Please choose according to customer's system configuration.
  In case of differential input form,BH7826FVM can be used, and in case of single input form, BH7824FVM/BD7830NUV can be used

Can bass play with a small and thin speaker?
- Because bass boost (for low region enhancement) circuit is built into BH7881EFV, an enough bass can be played with a small and thin speaker.

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