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BA7725 датащи(PDF) 6 Page - Rohm

номер детали BA7725
подробное описание детали  Analog compander for KARAOKE echo systems
Download  8 Pages
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производитель  ROHM [Rohm]
домашняя страница  http://www.rohm.com
Logo ROHM - Rohm

BA7725 датащи(HTML) 6 Page - Rohm

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6
Multimedia ICs
BA7725S / BA7725FS
Measurement circuit
BF
BF
VR
VR
SW
EXPAND
12345
789
10
11
6
17
12
13
14
15
16
18
19
20
21
22
V4
V6
+
+
R17
C15
R13
C14
R16
C18
R34
1k
C33
R11
C10
R8
+
+
+
COMPRESS
0.1
µ
MIC AMP IN
R2
2.2k
R3
82k
C1
1
µ
C4
22
µ
C5
0.1
µ
C6
0.47
µ
C32
0.1
µ
R35
10k
DLY BF IN
CMP BF OUT
+
C30
2.2
µ
C20
0.1
µ
R31
10k
R33
1k
LINE
OUT
LINE
IN
C20
0.1
µ
C19
0.47
µ
+
+
VCC 9V
Fig.1
The above measurement circuit applies to a BA7725S mount-
ed to a 22-pin SDIP package. A BA7725FS mounted to a 20-
pin SSOP-A package lacks N.C. pins 3 and 20; other than this
difference, the above circuit diagram applies.
Circuit operation
(1) MIC AMP IN / LINE OUT gain
Microphone amplifier gain (determined by R9 and R10) + line
amplifier gain (+12dB)
The audio signal is input via pin 22 (BA7725S) or pin 20
(BA7725FS) and amplified by the internal microphone amplifi-
er, whose gain can be set with (attached) R9 and R10.
Note: Microphone amplifier gain must be set above +15dB.
Microphone amplifier frequency
characteristic measurement circuit
+
Fig.2
1.5k
12k
22
21
BA7725S
Vout
VIN
60
50
40
30
20
10
0
– 10
–20
–30
– 40
1M
10M
24 6 8 1
1
8
6
4
21
8
6
4
2
Open loop gain
10k
100k
Frequency characteristic (Hz)
Microphone amplifier frequency
characteristics
Fig.3
++
+
+ 18dB
+
Fig.4
2
1
21
22
MIC AMP IN
R9
R10
SW
LINE OUT
LINE IN


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