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參數資料
| 型號： | LS1240A-S08-T |
| 廠商： | UNISONIC TECHNOLOGIES CO LTD |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | ELECTRONIC TONE RINGER WITH BUILT-IN BRIDGE RECTIFIER |
| 中文描述： | TELEPHONE RINGER CKT, PDSO8 |
| 封裝： | SOP-8 |
| 文件頁數： | 3/5頁 |
| 文件大?。?/td> | 228K |
| 代理商： | LS1240A-S08-T |
LS1240A
LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3 of 5
QW-R108-002,H
BLOCK DIAGRAM
1
2
3
4
8
7
6
5
N.C.
BUZZER
TELEPHONE
LINE
RECTIFIER
CAPACITOR
IN
IN
RECTIFIER
BRIDGE
THRESHOLD
CIRCUIT
WITH
HYSTERESIS
OUTPUT
STAGE
NONE
FREQUENCY
GENERATOR
SWITCHING
FREQUENCY
GENERATOR
SWEEP RATE
CONTROL CAPACITOR
OUTPUT FREQYENCY
CONTROL RESISTOR
GND
TELEPHONE
LINE
TEST CIRCUIT
R1=
27200
f1(Hz)
f2=0.725f1
f
SWEEP
=
750
C1(nF)
2.2k
1
μ
F
10
μ
F
C1
100nF
R1
14k
RL
Vout
V
AB
8
5
1
2
3
4
UTC LS 1240A
*(1-0.04 In
f1
1943
)
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