APA2012_18 datasheet(12/19 Pages) ANPEC

12 / 19 page

Rev. A.7 - Mar., 2018

www.anpec.com.tw

APA2012

Application Information (Cont.)

Output LC Filter

If the traces from the APA2012 to speaker are short, the

APA2012 doesn

’t require output filter for FCC & CE

standard.

A ferrite bead may be needed if it

’s failing the test for FCC

or CE is tested without the LC filter. The Figure 2 is the

sample for adding ferrite bead; the ferrite shows when

choosing high impedance in high frequency.

Figure 2. Ferrite bead output filter

VON

VOP

Ω

1nF

Ferrite

Bead

Ferrite

Bead

Figure 3

’s low pass filter cut-off frequency is F

Figure 3 is an example for adding the LC filter. It

’s recom-

mended to eliminate the radiated emission or EMI when

the trace from amplifier to speaker is too long.

Figure 3. LC output filter

(4)

FC(lowpass)

VON

VOP

µF

µH

Mixing Two Single-Ended Input Signals

INN

INP

Figure 4. Mixing Two Single-Ended Input Signals

For mixing two Single-Ended (SE) input signals, please

refer to Figure 4. The gains of each input can be set

difference:

(5)

150k

(1)

Ω

(6)

150k

(2)

Ω

The corner frequency of each input high- pass-filter also

can be set by R

1&C1, and R2&C2.

The non-inverting input

’s resistor (R

P) and capacitor (CP)

need to match the impedances of invert inputs.

(7)

(8)

//R

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