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參數資料
| 型號： | LS1240 |
| 廠商： | 永盛國際集團 |
| 英文描述： | Electronic Two-Tone Ringer |
| 中文描述： | 電子雙音鈴聲 |
| 文件頁數： | 1/7頁 |
| 文件大小： | 496K |
| 代理商： | LS1240 |
LS1240A
July 1998
ELECTRONIC TWO - TONE RINGER
.
LOW CURRENT CONSUMPTION, IN ORDER
TO ALLOW THE PARALLEL OPERATION OF 4
DEVICES
.
INTEGRATED RECTIFIER BRIDGE WITH
ZENER DIODES TO PROTECT AGAINST
OVERVOLTAGES
.
LITTLE EXTERNAL CIRCUITRY
.
TONE AND SWITCHING FREQUENCIES AD-
JUSTABLE BY EXTERNAL COMPONENTS
.
INTEGRATED VOLTAGE AND CURRENT
HYSTERESIS
DESCRIPTION
LS1240A is a monolithic integrated circuit designed
to replace the mechanical bell in telephone sets in
connection with an electro-acoustical converter. It
can drive directly a piezoceramic converter (buzz-
er)or a dynamic loudspeaker.
The output current capability of LS1240A is higher
than standard ringer. For driving a dynamic loud-
speaker LS1240A can simply use a decoupling ca-
pacitor, thus eliminating the usual transformer.
No current limitation is provided on the output stage
of LS1240A, so a minimum load DC of 50
is ad-
viced, in series with a proper capacitor.
The two tone frequencies generated are switched
by an internal oscillator in a fast sequence and made
audible across an output amplifier in the loud-
speaker, both tone frequencies and the switching
frequency can be externally adjusted.
The supply voltage is obtained from the AC ring sig-
nal and the circuit is designed so that noise on the
line or variations of the ringing signal cannot affect
correct operation of the device.
SO8
Minidip
ORDERING NUMBERS
Minidip
LS1240A
SO8
LS1240AD1
PIN CONNECTION
(top view)
1/7
相關PDF資料 |
PDF描述 |
|---|---|
| LS1240A | Electronic Two-Tone Ringer |
| LS1240AD1 | Electronic Two-Tone Ringer |
| LS1B-8R2K | 1 ELEMENT, 8.2 uH, GENERAL PURPOSE INDUCTOR |
| LS2520H-A94 | 20 CONTACT(S), FEMALE, STRAIGHT TELECOM AND DATACOM CONNECTOR, SOLDER, RECEPTACLE |
| LS2B-100K | 1 ELEMENT, 10 uH, GENERAL PURPOSE INDUCTOR |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LS1240A | 功能描述:電話振鈴器 Two-Tone Ringer RoHS:否 制造商:NJR 產品:FSK Demodulator / Tone Decoder 封裝 / 箱體:DIP-14 頻率:0.01 Hz to 300 KHz 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| LS1240A | 制造商:STMicroelectronics 功能描述:IC TWO TONE RINGER 1240 DIP8 |
| LS1240A | 制造商:STMicroelectronics 功能描述:IC TWO TONE RINGER 1240 DIP8 |
| LS1240A-D08-T | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:ELECTRONIC TONE RINGER WITH BUILT-IN BRIDGE RECTIFIER |
| LS1240AD1 | 功能描述:電話振鈴器 Two-Tone Ringer RoHS:否 制造商:NJR 產品:FSK Demodulator / Tone Decoder 封裝 / 箱體:DIP-14 頻率:0.01 Hz to 300 KHz 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
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