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參數(shù)資料
| 型號(hào)： | BA7725 |
| 廠商： | Rohm CO.,LTD. |
| 英文描述： | Analog compander for KARAOKE echo systems |
| 中文描述： | 卡拉OK擴(kuò)展器模擬回聲系統(tǒng) |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 94K |
| 代理商： | BA7725 |
6
Multimedia ICs
BA7725S / BA7725FS
Measurement circuit
B
BF
BF
VR
VR
SW
EXPAND
1
2
3
4
5
7
8
9
10
11
6
17
12
13
14
15
16
18
19
20
21
22
V4
V6
Fig.1
+
+
R17
C15
R13
C14
R16
C18
R34
1k
C33
0.1
μ
R11
C10
R
C
R8
+
+
+
COMPRESS
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
R33
1k
R31
10k
LINE
OUT
LINE
IN
C20
0.1
μ
C19
0.47
μ
+
+
V
CC
9V
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
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
V
out
V
IN
60
50
40
30
20
10
0
– 10
– 20
– 30
– 40
1M
10M
2
4 6 8 1
1
8
6
4
2
1
8
6
4
2
Open loop gain
10k
100k
Frequency characteristic (Hz)
V
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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BA7725FS | 制造商:ROHM 制造商全稱:Rohm 功能描述:Analog compander for KARAOKE echo systems |
| BA7725S | 制造商:ROHM 制造商全稱:Rohm 功能描述:Analog compander for KARAOKE echo systems |
| BA7725S/FS | 制造商:ROHM 制造商全稱:Rohm 功能描述:Multimedia LSIs |
| BA7726 | 制造商:ROHM 制造商全稱:Rohm 功能描述:Analog compander with vocal fader for KARAOKE |
| BA7726AFS | 制造商:ROHM 制造商全稱:Rohm 功能描述:Analog compander with vocal fader for KARAOKE |
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