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參數(shù)資料
| 型號： | LS656 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Telephone Speech Circuit With Multifrequency Tone Generator Interface(帶多頻語音發(fā)生器接口的電話語音電路) |
| 中文描述： | 電話語音電路多頻音發(fā)生器接口（帶多頻語音發(fā)生器接口的電話語音電路） |
| 文件頁數(shù)： | 12/15頁 |
| 文件大?。?/td> | 192K |
| 代理商： | LS656 |
Figure 16
:External Mute Function.
In addition to the above mentionedapplications,differentvaluesfor the externalcomponentscan be used
in order to satisfydifferent requirements.
The following table (refer to theapplication circuit of fig.10) can help the designers.
Component
R1
R2
Value
30
330
Purpose
Note
Bridge Resistors
R1 controls the receiving gain. When high current values are
allowed, R1 must be able to dissipate up to 1 W.
The Ratio R2/R1 fixes the amount of signal delivered to the line. R1
helps in fixing the DC characteristics (see R3 note).
The relationships involving R3 are :
Z
ML
= (20 R3//Z
B
) + R1, G
S
=
K
Z
L
//
Z
ML
V
L
= (I
L
– I
O
) (R3 + R1) + V
0
; V
0
= 3.7V
Without any problem it is possible to have a Z
ranging from 600
up to 900
. As far as the power dissipation is concerned, see R1
note.
The suggested value assures the minimum operating current. It is
possible to increase the supply current by decreasing R4 (they are
inversely proportional), in order to achieve the shifting of the AGC
starting point. (see fig. 16). After R4 changement, so
It’s possible to change R5 and R6 values in order to improve the
matching to different lines ; in any case :Z
L
R3
30
Line Current
Sensing Fixing DC
Characteristic
R
3
and
R4
13k
Bias Resistor
R5
R6
2.2k
6.8k
Balance Network
Z
B
=
R
1
R
2
, Z
B
= R5 + R6//X
C4
R7-R7’
100
Receiver
Impedance Matching
R7 and R7’, must be equal ; the suggested value is good for
matching to dynamic capsule ; there is no problem in increasing and
decreasing (down to 0
) this value. A DC decoupling must be
inserted when low resistance levels are used to stop
R8
200
Microphone
Impedance Matchin
Regulator AC
byPass
C1
10
μ
F
A value greater than 10
μ
F gives a system start time too high for
low current line during MF operation ; a lower value gives an
alteration of the AC line impedance at low frequency.
C2 changes with the characteristics of the transmission line.
C2
47nF
Matching to a
Capacitive Line
Receiving Gain
Flatness
Balance Network
DC Filtering
C3
82nF
C3 depends on balancing and line impedance versus frequency.
C4
C5
15nF
0.33
μ
F
See note for R5, R6.
The C5 range is from 0.1
μ
F to 0.47
μ
F. The lowest value is ripple
limited, the higher value is starting up time limited.
C6-C7
C8
1000pF
100
μ
F
RF byPass
Receiving Output
DC Decoupling
Receiving Input DC
Decoupling
See note for R7, R7.
C9
1
μ
F
a) withmultifrequency
b) withoutmultifrequency
LS656
12/15
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LS656AB | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:TELEPHONE SPEECH CIRCUIT WITH MULTIFREQUENCY TONE GENERATOR INTERFACE |
| LS656AD1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:TELEPHONE SPEECH CIRCUIT WITH MULTIFREQUENCY TONE GENERATOR INTERFACE |
| LS656B | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:TELEPHONE SPEECH CIRCUIT WITH MULTIFREQUENCY TONE GENERATOR INTERFACE |
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| LS680-1 | 制造商:TAIYO-YUDEN 制造商全稱:Taiyo Yuden (U.S.A.), Inc 功能描述:12 Volt Input Four Tube CCFT Inverter (8W) Brightness Control |
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