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参数资料
| 型号： | ILA1068 |
| 厂商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Versatile Telephone Transmission Circuit with Dialler Interface |
| 中文描述： | 多功能电话传输电路拨号器接口 |
| 文件页数： | 3/11页 |
| 文件大小： | 352K |
| 代理商： | ILA1068 |
ILA1068
3
FUNCTIONAL DESCRIPTION
Supplies V
CC
, LN, SLPE, REG and STAB
Power for the IC and its peripheral circuits is usually
obtained from the telephone line. The ILA1068
develops its own supply at V
CC
and regulates its
voltage drop. The supply voltage V
CC
may also be
used to supply external circuits, e.g. dialling and
control circuits.
Decoupling of the supply voltage is performed by a
capacitor between V
CC
and V
EE
; the internal voltage
regulator is decoupled by a capacitor between REG
and V
EE
.
The DC current flowing into the set is determined by
the exchange voltage (V
exch
), the feeding bridge
resistance, (R
exch
) and the DC resistance of the
telephone line (R
line
).
An internal current stabilizer is set by a resistor of
3.6 K
between the current stabilizer pin STAB and
V
EE
(see Fig.1).
Figure 1. Supply arrangement
If the line current I
line
exceeds the current I
CC
+ 0.5 mA
required by the circuit itself (approximately 1mA)
plus the current I
p
required by the peripheral circuits
connected to V
CC
, then the voltage regulator diverts
the excess current via LN.
The regulated voltage on the line terminal (V
LN)
can
be calculated
as
:
V
LN
= V
ref
+ I
SLPE
x R9
V
LN
= V
ref
+ ((I
line
- I
CC
- 0.5 x 10
3
)-I
p
) x R9,
where V
ref
is an internally generated temperature
compensated reference voltage of 4.2 V and R9 is an
external resistor connected between SLPE and V
EE
.
The preferred value for R9 is 20
. Changing the
value of R9 will also affect microphone gain, DTMF
gain, gain control characteristics, side-tone level, the
maximumoutput swing on LN and the DC
characteristics (especially at lower voltages).
Under normal conditions, when I
SLPE
>> I
CC
+ 0.5 mA
+ Ip , the static behaviour of the circuit is that of a
4.2 V regulator diode with an internal resistance
equal to that of R9. In the audio frequency range, the
dynamic impedance is largely determined by R1 (see
Fig.2).
The internal reference voltage can be adjusted by
means of an external resistor (R
VA
). This resistor,
connected between LN and REG, will decrease the
internal reference voltage; when connected between
REG and SLPE, it will increase the internal reference
voltage. Current (Ip) available from V
CC
for supplying
peripheral circuits depends on external components
and on the line current.
L
eq
= C3 x R9 x R
P
R
P
= 17.5K
Figure 2. Equivalent impedance circuit
Microphone inputs MIC+ and MIC- and gain pins
GAS1 and GAS2
The circuit has symmetrical microphone inputs. Its
input impedance is 64 K
(2 x 32 K
) and its voltage
gain is typically 52 dB (when R7 = 68 K
, see
Figure 5). Dynamic, magnetic, piezo-electric or
electret (with built-in FET source followers) can be
used.
The gain of the microphone amplifier can be adjusted
between 44 dB and 60 dB. The gain is proportional to
the value of R7 connected between GAS1 and GAS2.
An external capacitor C6 of 100 pF between GAS1
and SLPE is required to ensure stability. A larger
value may be chosen to obtain a first-order low-pass
filter. The cut-off frequency corresponds to the time
constant R7 x C6.
V
CC
V
EE
I
CC
I
SLPE
I
SLPE
I
C
I
line
R
line
R
exch
V
exch
LN
0.5 mA
+0.5 mA
R1
R9
STAB
SLPE
REG
C3
R5
C1+
+
+
-
-
-
peripheral
circuit
DC
AC
IlA1068
相关PDF资料 |
PDF描述 |
|---|---|
| ILA1068N | Versatile Telephone Transmission Circuit with Dialler Interface |
| ILA7050 | LOW VOLTAGE MONO/STEREO POWER AMPLIFIER |
| ILA7052 | MONO OUTPUT AMPLIFIER |
| ILD1 | PHOTOTRANSISTOR OPTOCOUPLER |
| ILQ1 | PHOTOTRANSISTOR OPTOCOUPLER |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ILA1068N | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Versatile Telephone Transmission Circuit with Dialler Interface |
| IL-A-10P-S3L2-3 | 制造商:Japan Aviation Electronics (JAE) 功能描述: |
| ILA1185A | 制造商:IKSEMICON 制造商全称:IK Semicon Co., Ltd 功能描述:TRIAC PHASE ANGLE CONTROLLER |
| ILA1185A_11 | 制造商:IKSEMICON 制造商全称:IK Semicon Co., Ltd 功能描述:TRIAC PHASE ANGLE CONTROLLER |
| ILA1238NS | 制造商:未知厂家 制造商全称:未知厂家 功能描述:FM/AM STEREO RADIORECEIVER |
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