TS4990

Application information

23/32

Figure 64.

Differential input amplifier configuration

Note:

This formula is true only if:

Example bill of materials

The bill of materials in Table 7 is for the example of a differential amplifier with a gain of 2

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

R2

R1

Neg. Input

Vcc

Cin

Cs

Cb

Standby

Control

Speaker

8Ohms

Bias

AV = -1

Vin-

Vin+

Bypass

Standby

Vout 1

Vout 2

+

-

+

-

TS4990

R1

Pos. Input

Cin

R2

C

in

1

2

πR

---------------------

(F)

≈

F

CB

1

2

π R

1

R

2

+

()C

B

----------------------------------------

(Hz)

=

Table 7.

Bill of materials for differential input amplifier application

Pin name

Functional description

20k / 1%

20k / 1%

100nF

1µF

U1

TS4990