參數(shù)資料
型號： 935084930112
廠商： NXP SEMICONDUCTORS
元件分類： 無繩電話/電話
英文描述： TELEPHONE SPEECH CKT, PDIP20
封裝： 0.300 INCH, PLASTIC, SOT-146, DIP-20
文件頁數(shù)： 7/38頁
文件大?。?/td> 303K
代理商： 935084930112
March 1994
15
Philips Semiconductors
Product specication
Low voltage versatile telephone transmission circuit
with dialler interface and transmit level dynamic limiting
TEA1064A
R2, R3, R8, R9 and Zbal (see Fig.18). Maximum
compensation is obtained when the following conditions
are fulfilled:
a) R9
× R2 = R1 × (R3 + [R8//Zbal])
b) (Zbal/[Zbal + R8]) = (Zline/[Zline + R1])
If fixed values are chosen for R1, R2, R3 and R9, then
condition a) is always fulfilled provided
R8//Zbal << R3.
To obtain optimum sidetone suppression, condition b) has
to be fulfilled, resulting in:
Zbal = (R8/R1) × Zline =k × Zline
where k is a scale factor; k = (R8/R1).
The scale factor k (value of R8) is chosen to meet the
following criteria:
compatibility with a standard capacitor from the E6 or
E12 range for Zbal;
Zbal//R8 << R3 to fulfil condition a) and thus ensure
correct anti-sidetone bridge operation;
Zbal + R8 >> R9 to avoid influencing the transmit gain.
In practice Zline varies considerably with the line length and
line type. Therefore the value chosen for Zbal should be for
an average line length giving satisfactory sidetone
suppression with short and long lines. The suppression
also depends on the accuracy of the match between
Zbal and the impedance of the average line.
Example
The line impedance for which optimum suppression is to
be obtained can be represented by
210
+ (1265 // 140 nF). This represents a 5 km line of
0.5 mm diameter copper twisted-pair cable matched with
600
(176 /km; 38 nF/km).
With k = 0.64 this results in: R8 = 390
;
Zbal = 130 + (820 // 220 nF).
The anti-sidetone network for the TEA1060 family shown
in Fig.18 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.
Alternatively a conventional Wheatstone bridge can be
used as an anti-sidetone circuit (Fig.19). 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
“Versatile speech transmission ICs for electronic
telephone sets”, order number 9398 341 10011).
Notes
1. The reference used for the MUTE, DTMF and PD
inputs is SLPE.
2. A LOW level for any of these pins is defined by
connection to SLPE, a HIGH level is defined as a
voltage greater than VSLPE + 1.5 V and smaller than
VCC1 + 0.4 V.
相關(guān)PDF資料
PDF描述
0672.400 Circular Connector; MIL SPEC:MIL-C-26482, Series I, Solder; Body Material:Aluminum; Series:PT06; Number of Contacts:55; Connector Shell Size:22; Connecting Termination:Solder; Circular Shell Style:Straight Plug; Body Style:Straight
0672.500 Circular Connector; No. of Contacts:61; Series:; Body Material:Aluminum; Connecting Termination:Solder; Connector Shell Size:24; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:24-61
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