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參數(shù)資料
| 型號(hào)： | 933880320112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | TELEPHONE SPEECH CKT, PDSO20 |
| 封裝： | PLASTIC, SOT-163, SO-20 |
| 文件頁數(shù)： | 28/29頁 |
| 文件大?。?/td> | 231K |
| 代理商： | 933880320112 |
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June 1990
8
Philips Semiconductors
Product specication
Low voltage versatile telephone
transmission circuit with dialler interface
TEA1067
Example
The line balance impedance (Zbal) at which the optimum
suppression is present can be calculated by:
suppose Zline = 210 + (1265 //140 nF), representing a
5 km line of 0.5 mm diameter, copper, twisted-pair cable
matched to 600
(176 /km; 38 nF/km).
When k = 0.64 then R8 = 390
;
Zbal = 130 + (820 //220 nF).
The anti-sidetone network for the TEA1060 family shown
in Fig.5 attenuates the signal received from the line by 32
dB before it enters the receiving amplifier. The attenuation
is almost constant over the whole audio frequency range.
Fig.6 shows a conventional Wheatstone bridge
anti-sidetone circuit that can be used as an alternative.
Both bridge types can be used with either resistive or
complex set impedances.
More information can be found in the designer guide; 9398 341 10011
Fig.5 Equivalent circuit of TEA1060 anti-sidetone bridge.
handbook, full pagewidth
MSA500
R1
R2
R9
R3
IR
R8
VEE
SLPE
LN
Zline
Rt
im
Zbal
Fig.6 Equivalent circuit of an anti-sidetone network in a Wheatstone bridge configuration.
handbook, full pagewidth
MSA501
R1
R9
IR
R8
VEE
SLPE
LN
Zline
Rt
im
RA
Zbal
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