TS4985 datasheet(24/29 Pages) STMICROELECTRONICS

24 / 29 page

Application Information

TS4985

24/29

In order to reach the optimal performance of the differential function,

R1 and R2 should be

matched at 1% maximum.

The value of the input capacitor

CIN can be calculated with the following formula, using the -3dB

lower frequency required (where

FL is the lower frequency required):

Note:

This formula is true only if:

is 5 times lower than FL.

The following bill of materials (

Table 8) is provided as an example of a differential amplifier with

a gain of 2 and a -3dB lower cut-off frequency of about 80Hz.

Figure 66. Differential input amplifier configuration

Table 8.

Example of a bill of materials

Designator

Part Type

R1L = R1R

20k

Ω / 1%

R2L = R2R

20k

Ω / 1%

CinR = CinL

100nF

Cb=CS

1µF

TS4985

R1L

CinL

R2L

VCC

Neg. Input LEFT

8 Ohms

LEFT Speaker

8 Ohms

RIGHT Speaker

R1R

CinR

R2R

Neg. Input RIGHT

StandBy L

Control

R1L

CinL

Pos. Input LEFT

R1R

CinR

Pos. Input RIGHT

R2L

R2R

Bias

StandBy L

Bypass

VO-L

VO+L

VO-R

VO+R

IN-L

IN+L

IN+R

IN-R

AV = -1

StandBy R

TS4985

StandBy R

Control

)

(

≈

)

(

)

(

TS4985 Datasheet(PDF) 24 Page - STMicroelectronics

TS4985 Datasheet(HTML) 24 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29

Datasheet Download

Link URL