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ICs for Audio Common Use

AN7118S

Low Voltage Dual 35mW Audio Power Amplifier Circuits (BTL 300mW)

Overview

The AN7118S is the ICs designed for power amplifier of

low voltage operated compact radio and stereo tape

recorder. Stereo operation is enabled due to incorporat-

ing two amplifiers on one chip. Miniaturization of cassette

and high integration is realized due to SOP package.

Unit : mm

1

2

3

4

5

6

7

8

9

18

17

16

15

14

13

12

11

10

Features

• Low voltage operation : V CC = 1.8V to 4.5V

• Reduced voltage operation is available.

• Low pop noise when supply voltage is switched ON

and OFF

• Stereo drive of 4 ½

(speaker) to 32

½

(headphone) load

is possible.

0.3

5.4±0.3

7.7±0.3

18 - Lead SOP Package (SOP018-P-0300)

n

Block Diagram

V CC

18

7

6

5

4

9

N.C

3

8

Input

Amp.

Driver

SEPP

Output Amp.

2

Input (1)

Output (1)

Input (2)

Output (2)

11

Input

Amp.

Driver

SEPP

Output Amp.

17

N.C

16

10

12

13

14

15

1

GND (Input)

GND (Output)

n

n

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AN7118S

ICs for Audio Common Use

Pin Descriptions

Pin No.

Pin Name

Pin No.

Pin Name

1

2

3

4

5

6

7

8

9

GND (Output)

Output Ch.1

NC

Bootstrap

Phase Compensation

Phase Compensation

N.F.B

Input Ch.1

V CC

10

11

12

13

14

15

16

17

18

GND (Input)

Input Ch.2

N.F.B

Phase Compensation

Phase Compensation

Bootstrap

NC

Output Ch.2

Ripple Filter

n

Absolute Maximum Ratings (Ta= 25˚C)

Parameter

Symbol

Rating

Unit

Supply Voltage

Supply Current

Power Dissipation

Operating Ambient Temperature

Storage Temperature

V CC

I CC

P D

T opr

T stg

4.5

1

400

– 20 ~ + 75

– 50 ~ + 125

V

A

mW

˚C

˚C

n

Electrical Characteristics (V CC = 3V, Ta= 25˚C)

Parameter

Symbol

Condition

min.

typ.

max.

Unit

Quiescent Circuit Current

< DUAL (f=1kHz) >

Voltage Gain

Maximum Output

Total Harmonic Distortion

Output Noise Voltage

Input Resistance

Ripple Rejection Ratio

I CQ

V i = 0mV

13

18

mA

G V

P O

THD

V no

R i

RR

V i = 1.5mV, R L = 32½

THD= 10%, R L = 32

45

47

33

0.3

0.5

20

35

49

dB

mW

%

mW

k dB

2ch.

V i = 1.5mV, R L = 32½ ´ 2ch.

R g = 10k½ , DIN Audio Filter

½

´

1

1

V CC = 3V

±

200mV, f= 100Hz

n

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ICs for Audio Common Use

AN7118S

n

Application Circuit

AN7118S Dual Circuit

V CC

–

+

22

µ

F

68pF

47µF

–

+

220

µ

F

N.C

+

–

Ch.1

Input

3

7

6

5

9

4

470

µ

F

2

8

+

–

0.01

µ

F

SP

AN7118S

Ch.2

Input

10

1

4.7

½

470

µ

F

11

17

+

–

16

12

13

14

18

15

SP

N.C

+

+

+

–

4.7

½

–

2 2

µ

F

68pF

–

2 20µF

47µF

n

Characteristics Curve

P D – Ta

1200

1000

800

600

400

200

0

0

20

40

60

80

Ambient Temperature Ta (˚C)

Supplementary Explanation of IC Characteristics

• Not necessary for input coupling capacitor. Input electric potential is about 0 bias, using PNP Tr for input stage.

• One chip dual amp. (Stereo operation)

• Battery operation is possible at 1.8V to 4.5V

• Decreased voltage operation is available, and suitable for a long battery operation.

• Load impedance can be driven from 4½ , which makes it possible to use for both speaker and headphone.

• Small shock noise at power ON and OFF.

n

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