參數(shù)資料
型號(hào)： TEA1062A
廠商： NXP SEMICONDUCTORS
元件分類： 無(wú)繩電話/電話
英文描述： Low voltage transmission circuits with dialler interface(帶撥號(hào)接口的低壓傳送電路)
中文描述： TELEPHONE SPEECH CKT, PDIP16
封裝： 0.300 INCH, PLASTIC, SOT-38, DIP-16
文件頁(yè)數(shù)： 7/28頁(yè)
文件大小： 211K
代理商： TEA1062A
1997 Sep 03
7
Philips Semiconductors
Product specification
Low voltage transmission circuits with
dialler interface
TEA1062; TEA1062A
Sidetone suppression
The anti-sidetone network, R1//Z
line
, R2, R3, R8, R9 and
Z
bal
, (see Fig.4) suppresses the transmitted signal in the
earpiece. Maximum compensation is obtained when the
following conditions are fulfilled:
×
=
(1)
(2)
If fixed values are chosen for R1, R2, R3 and R9, then
condition (1) will always be fulfilled when
|
R8//Z
bal
|
<< R3.
To obtain optimum sidetone suppression, condition (2) has
to be fulfilled which results in:
Where k is a scale factor;
The scale factor k, dependent on the value of R8, is
chosen to meet the following criteria:
compatibility with a standard capacitor from the E6 or
E12 range for Z
bal
Z
bal
//R8
<< R3 fulfilling condition (a) and thus
ensuring correct anti-sidetone bridge operation
Z
bal
+ R8
>> R9 to avoid influencing the transmit gain.
In practise Z
line
varies considerably with the line type and
length. The value chosen for Z
bal
should therefore be for
an average line length thus giving optimum setting for
short or long lines.
R9
R2
×
R1
R3
R8
Z
bal
Z
bal
×
+
R8
+
Z
+
Z
bal
R8
------------------------
Z
Z
line
R1
+
-------------------------
=
Z
bal
R1
R8
Z
line
k
Z
line
×
=
×
=
k
R1
=
E
XAMPLE
The balance impedance Z
bal
at which the optimum
suppression is present can be calculated by:
Suppose Z
line
= 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
;
Z
bal
= 130
+ (820
//220 nF).
The anti-sidetone network for the TEA1060 family shown
in Fig.4 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.
Figure 5 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 on the
balancing of anti-sidetone bridges can be obtained in our
publication “Applications Handbook for Wired telecom
systems, IC03b” order number 9397 750 00811.)
相關(guān)PDF資料
PDF描述
TEA1062AM1 Low voltage transmission circuits with dialler interface
TEA1062AT Low voltage transmission circuits with dialler interface
TEA1062M1 Low voltage transmission circuits with dialler interface
TEA1062T Low voltage transmission circuits with dialler interface
TEA1062AN LOW VOLTAGE TELEPHONE TRANSMISSION CIRCUIT WITH DIALLER INTERFACE
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TEA1062A/C4,112 功能描述:電信語(yǔ)音調(diào)制 IC TELEPHONE TRANSMISSION CIRCUIT RoHS:否 制造商:Epson Electronics America 產(chǎn)品: 應(yīng)用:Voice Guidance product 封裝 / 箱體:PQFP-52 電源電壓-最大:3.6 V, 5.5 V 最大工作溫度: 最小工作溫度: 封裝:
TEA1062A/C4/M1,112 功能描述:電信語(yǔ)音調(diào)制 IC SIMPLE LOW VOLT. TRANS REVER RoHS:否 制造商:Epson Electronics America 產(chǎn)品: 應(yīng)用:Voice Guidance product 封裝 / 箱體:PQFP-52 電源電壓-最大:3.6 V, 5.5 V 最大工作溫度: 最小工作溫度: 封裝:
TEA1062AM1 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Low voltage transmission circuits with dialler interface
TEA1062AN 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:LOW VOLTAGE TELEPHONE TRANSMISSION CIRCUIT WITH DIALLER INTERFACE
TEA1062ANG-S16-R 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:LOW VOLTAGE TELEPHONE TRANSMISSION CIRCUIT WITH DIALLER INTERFACE
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