TS925AI(2011) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

TS925AI
(Rev.:2011)

Rail-to-rail high output current quad operational amplifiers with standby mode and adjustable phantom ground

STMicroelectronics 

Using the TS925 as a preamplifier and speaker driver

TS925

3

Using the TS925 as a preamplifier and speaker driver

The TS925 is an input/output rail-to-rail quad BiCMOS operational amplifier. It can operate

with low supply voltages (2.7 V) and drive output loads as low as 32 Ω.

This section illustrates these features by providing an example of how the device can be

used as a preamplifier and speaker driver.

The application circuit is shown in Figure 16.

● Operators A1and A4 are used in a preamplifier configuration.

● Operators A2 and A3 are used in a push-pull configuration driving a headset.

● The phantom ground is used as a common reference level (VCC/2).

● The power supply is delivered by two LR6 batteries (2 x 1.5 V nominal).

Figure 16. Electrical schematic

C1

M ICROPHONE

M ike pream plifier

C9

M IKE

OUTPUT

C6

C4

C14

C2

C3

C5

D1

D2

ALC

C7

Q1

Vcc

PHANTOM GROUND

4

8

9

13

C15 C10 C18 C8

C9

STBY

HEADPHONES

C12

6

7

5

C13

11

10

12

C10

Headphones amplifier

AM PLIFIER

IN P U T

LEFT

C11

AM PLIFIER

IN P U T

R IG H T

10/18

Doc ID 4949 Rev 4

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