BA7725S データシートの表示（PDF） - ROHM Semiconductor

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BA7725S

Analog compander for KARAOKE echo systems

ROHM Semiconductor 

Multimedia ICs

Relationship between echo gain and loop gain

(dB)

BA7725S / BA7725FS

A

B

B

(t)

C

C

C

Fig.8

(4) Echo signal frequency characteristicis

The figure below shows the attenuation of signals out-

put from pin 1 when the audio signal is input to pin 22

(BA7725S) or pin 20 (BA7725FS). (This is the attenua-

tion when the input signal is output without being

passed through the BU9252S / F, and when the prima-

ry and secondary echo signals are passed through an

attached low pass filter with the same constant shown

in "Application example," and then processed by the

BU9252S / F delay circuit.)

Note: These are the values when using the constant shown in "Application

example."

•External dimensions (Units: mm)

BA7725S

A : Echo signal attenuation

B : Loop signal attenuation

C : Delay time

BA7725FS

Sound source

0

Primary echo signal

– 10

Secondary echo signal

– 20

– 30

– 40

3pin, 5pin = VCC (VR : Max.)

– 50

100

1k

10k

SIGNAL FREQUENCY : f (Hz)

100k

Echo signal frequency

characteristics

Fig.9

19.4 ± 0.3

22

12

1

1.778

11

7.62

0.5 ± 0.1 0° ~ 15°

0.3 ± 0.1

SDIP22

8

8.7 ± 0.2

20

11

1

10

0.8

0.36 ± 0.1

0.3Min.

0.15

SSOP-A20

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