BA7725FS ROHM Electronics, BA7725FS Datasheet - Page 8

• Manufacturer Part Number: BA7725FS
• Manufacturer: ROHM Electronics

Relationship between echo gain and loop gain
(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
•
(dB)
8
Multimedia ICs
External dimensions (Units: mm)
BA7725S
example."
C
22
1
A
1.778
19.4
0.3
C
SDIP22
B
12
11
Fig.8
0.5
0.1
C
B
0 ~ 15
7.62
(t)
A : Echo signal attenuation
B : Loop signal attenuation
C : Delay time
BA7725FS
0.8
20
1
8.7
0.2
– 10
– 20
– 30
– 40
– 50
0
100
11
10
SSOP-A20
0.36
Secondary echo signal
3pin, 5pin = V
BA7725S / BA7725FS
0.1
Echo signal frequency
characteristics
SIGNAL FREQUENCY : f (Hz)
CC
1k
0.3Min.
(VR : Max.)
Fig.9
Sound source
Primary echo signal
10k
0.15
100k