SM6453AB データシートの表示（PDF） - Nippon Precision Circuits

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SM6453AB

3-wire Serial Data Volume Control for Headphone Amplifier IC

Nippon Precision Circuits  

SM6453AB

System Reset Function (RSTN)

The system is reset using a LOW-level pulse on RSTN. After the system is reset, AGC is OFF, bass boost mode

is BB1, input selector is LIN1/RIN1, and LOUT/ROUT output voltage gain is muted.

AGC

Bass boost mode Bass boost function

Input Select

EVR gain (GEVR)

Output gain (GO)

OFF

BB1

OFF

LIN1, RIN1

MUTE

MUTE

Bass Boost Function with Automatic Gain Control (AGC)

Equivalent circuit

Rch 1

Rch 2

Lch 1

Lch 2

*2

CINR1

1µF

RIN1

*2

CINR2

1µF

RIN2

*2

CINL1

1µF

LIN1

*2

CINL2

1µF

LIN2

EVR

Block

RIN

(Equivalent input

resistance:23kΩ)

VREF1

EVR

Block

RIN

(Equivalent input

resistance:23kΩ)

VREF1

Bass Boost Block

R1 *3

R1R

40kΩ

BSTN

C2

2200pF

R3 *4

R1L

2kΩ

40kΩ

BSTC

Bass

Boost

Amp

VREF1

VREF1 VREF1

240kΩ

60kΩ

60kΩ

Headphone

Amp

VREF1

240kΩ

60kΩ

60kΩ

Headphone

Amp

VREF1

VDD

COUT

220µF

COUT

220µF

LRMXO

AGC Block

AGC Amp

VREF1

VREF1 VREF1

*1: From “Measurement circuit”. Adjustment AGC detection level and time constant.

*2: CINR1 = CINL1, CINR2 = CINL2 → CIN

*3: RIN1 = LIN1 → R1 = (R1R/2 + R1L/2) = 20kΩ

*4: BB1 → R3 = 15kΩ, BB2 → R3 = 60kΩ

NIPPON PRECISION CIRCUITS INC.—12

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