MB86435 Просмотр технического описания (PDF) - Fujitsu

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MB86435

3 V Single Power Supply Audio Interface Unit (AIU)

Fujitsu 

MB86435

4. Receiver Connections

It is possible to add tones and adjust sidetones by using amp 1,2 and 3 and the electronic volume control. When

using amp 3, however, it is necessary to include HPF to avoid interference from the speaker amp DC.

• Tone and Sidetone Addition by Inclusion of Secondary LPF and Primary HPF.

SGC

IM1

-

+

AMP1 OP1

R1

R2

C1

C2

R3

R4 R5

SGC

C3

SGC

IM2 R6

-

OP2

+

AMP2

R7 C4

PTBO

(receiving)

TONEO (tone)

BBO (sidetone)

Secondary LPF

A= –R2/R3

ω/Q=1/C2 × (1/R1+1/R2+1/R3)

ω2=1/(R1 R3 C1 C2)

Signal addition

R4=R5=R6=R7=100 kΩ

C3=C4=0.1µF

EV2

BTO

SGC

IM3

-

BBI

+

AMP3

(Inside IC)

• Amp1, Amp2 not used

C5

R8

R9

C6

IMTON

Primary HPF

A= –R9/R8

fc=1/(2πC5 R8)

C6=0.1µF

The following settings are

necessary to comply with CCITT

Recommendation

R8=R9=100 kΩ

C5=0.039µF

SGC

-

+

AMP1

IM1

OP1

(Inside IC)

SGC

-

+

AMP2

IM1

OP2

EV2

BTO

open

(Inside IC)

Note: When amps are not used, the amp input and output should be shorted together.

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