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參數(shù)資料
| 型號： | TEA1065T |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | Versatile telephone transmission circuit with dialler interface |
| 中文描述： | TELEPHONE SPEECH CKT, PDSO24 |
| 封裝： | PLASTIC, SO-24 |
| 文件頁數(shù)： | 5/28頁 |
| 文件大?。?/td> | 154K |
| 代理商： | TEA1065T |
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March 1994
5
Philips Semiconductors
Product specification
Versatile telephone transmission circuit with
dialler interface
TEA1065
FUNCTIONAL DESCRIPTION
Supply: V
CC
, LN, SLPE, REG and STAB
The circuit and its peripherals are usually supplied from the
telephone line. The circuit develops its own supply voltage
at V
CC
(pin 21) and regulates its voltage drop between LN
and SLPE (pins 1 and 24). The internal supply requires a
decoupling capacitor between V
CC
and V
EE
(pin 16); the
internal voltage regulator has to be decoupled by a
capacitor from REG (pin 22) to V
EE
. The internal current
stabilizer is set by a 3.6 k
resistor connected between
STAB (pin 9) and V
EE
.
The TEA1065 can be set either in a DC voltage regulator
mode or in a DC current regulator mode. The DC mask can
be selected by connecting the appropriate external
components to the dedicated pins (VSI, REFI, DOC,
VBG).
When the DC current regulator mode is not required it can
be cancelled by connecting pin VSI to V
EE
; pins REFI,
VBG and DOC are left open-circuit.
Voltage regulator mode
The voltage regulator mode is achieved when the line
current is less than the current I
knee
as illustrated in Fig.3.
With R13 = R14 = 30 k
, the current I
knee
= 30 mA
(I
p
= 0 mA).
This line current value will be reached when the voltage on
pin VSI (almost equal to the voltage on pin SLPE) exceeds
the voltage on pin REFI (equal to the voltage on pin VBG
divided by the resistor tap R13, R14). For other values of
R13 and R14, the I
knee
current is given by the following
formula:
I
knee
= I
CC
+
I
P
+
(VBG/R9)
×
{R14/(R14
+
R13)}
(R15/R9)
×
I
O
(VSI)
I
CC
is the current required by the circuit itself
(typ. 1.14 mA). I
P
is the current required by the peripheral
circuits connected between V
CC
and V
EE
. I
O(VSI)
is the
output current from pin VSI (typ. 2.5
μ
A).
The DC slope of the V
line
/I
line
curve is, in this mode,
determined by R9 (R9 = R9a
+
R9b) in series with the
r
ds
of the external line current control transistor (see Fig.4;
r
ds
=
V
GS
/
I
D
at V
GS
= V
DS
).
Current regulator mode
The current regulator mode is achieved when the line
current is greater than I
knee
. In this mode, the slope of the
V
line
/I
line
curve is approximately 1300
with R9 = 20
,
R16 = 1 M
, R13 = R14 = 30 k
. For other values of
these resistances, the slope value can be approximated by
the following formula:
R9
×
{1
+
R16
×
(1/R13
+
1/R14)}
Fig.3 Voltage and current regulator mode.
handbook, full pagewidth
MBA567
line
current
Iknee
voltage
regulator
mode
current
regulator
mode
set
voltage
00
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