BD37521FS
Sound Processors with built-in 2-band Equalizers

This series supports common control software, increasing design and development efficiency. In addition, an internal 2-band equalizer enables the adjustment of the tone and bass signals without using external components, while 3 input selectors and 4ch independent volume and fader control ensure compatibility with 3 audio inputs and 4ch output (front/rear/left/right), contributing to greater space savings.

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Product Detail

 
Part Number | BD37521FS-E2
Status | Recommended
Package | SSOP-A24
Unit Quantity | 2000
Minimum Package Quantity | 2000
Packing Type | Taping
RoHS | Yes

Specifications:

Vcc(Min.)[V]

7.0

Vcc(Max.)[V]

9.5

Iq[mA]

38.0

I/F

I2C BUS

Outputs

4

Volume Range

+15to-79, -∞

Tone Control Band

BASS, Treble

Number of of single input

3

Number of of ISO input

1

Input Gain[dB]

0to+20

LOUDNESS

External

FADER[dB]

0to-79, -∞

THD[%]

0.001

Output Noise[µVrms]

3.8

Output voltage(Max.)[Vrms]

2.3

Operating Temperature (Min.)[°C]

-40

Operating Temperature (Max.)[°C]

85

Package Size [mm]

10x7.8(t=2.1)

Features:

・Reduce switching noise of input gain control, mute, main volume,
    fader volume, bass, treble, loudness by using advanced switch circuit
    [Possible to control all steps]
・Built-in ground isolation amplifier inputs, ideal for external stereo input.
・Built-in input gain controller reduce switching noise for volume of
    a portable audio input.
・Decrease the number of external components by built-in 2-band equalizer filter. 
    And, possible to control Gv by I²C BUS control.
・It is possible for the bass, treble to the gain adjustment
    quantity of ±20dB and 1 dB step gain adjustment.
・Bi-CMOS process is suitable for the design of low current and low energy.
    And it provides more quality for small scale regulator and heat in a set.
・Package is SSOP-A24. Putting input-terminals together and
    output-terminals together can make PCB layout easier
    and can makes area of PCB smaller.)
・It is possible to control by 3.3V / 5V for I²C BUS.

Design Resources

 

Technical Articles

Schematic Design & Verification

  • Impedance Characteristics of Bypass Capacitor

Thermal Design

  • What Is Thermal Design
  • Method for Calculating Junction Temperature from Transient Thermal Resistance Data
  • Thermal Resistance

Tools

2D/3D/CAD

  • SSOP-A24 Footprint / Symbol

Packaging & Quality

Package Information

  • Package Information
  • Anti-Whisker formation

Manufacturing Data

  • Factory Information

Environmental Data

  • UL94 Flame Classifications of Mold Compound
  • Compliance with the ELV directive
  • REACH SVHC Non-use Declaration
  • RoHS Comission Delegated Directive

Export Information

  • The Export Control Order
  • Export Administration Regulations(EAR)