Datasheet > ILA1068

ILA1068

更新时间： 2022-11-27 00:27:27

品牌	Logo	应用领域
其他 - ETC		电话
页数	文件大小	规格书
11页	352K
描述
Versatile Telephone Transmission Circuit with Dialler Interface

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ILA1068 数据手册

ILA1068

FUNCTIONAL DESCRIPTION

maximum output 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_CCfor supplying

peripheral circuits depends on external components

and on the line current.

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 and regulates its

voltage drop. The supply voltage V 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_CCand 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 KW between the current stabilizer pin STAB and

V_EE(see Fig.1).

R_line

I_line

I_SLPE+0.5 mA

I_CC

V_CC

IlA1068

I_C

R_exch

0.5 mA

V_EE

peripheral

circuit

V_exch

SLPE

REG

STAB

I_SLPE

L_eq= C3 x R9 x R_P

R_P= 17.5KW

Figure 2. Equivalent impedance circuit

Figure 1. Supply arrangement

Microphone inputs MIC+ and MIC- and gain pins

GAS1 and GAS2

If the line current I_lineexceeds the current I_CC+ 0.5 mA

required by the circuit itself (approximately 1mA)

plus the current I_prequired by the peripheral circuits

connected to V_CC, then the voltage regulator diverts

the excess current via LN.

The circuit has symmetrical microphone inputs. Its

input impedance is 64 KW (2 x32 KW) and its voltage

gain is typically 52 dB (when R7 = 68 KW, see

Figure 5). Dynamic, magnetic, piezo-electric or

electret (with built-in FET source followers) can be

used.

The regulated voltage on the line terminal (V_LN)can

be calculated as:

V_LN= V_ref+ I_SLPEx R9

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 xC6.

V_LN= V_ref+ ((I_line- I_CC- 0.5 x 10³)-I_p) x R9,

where V is an internally generated temperature

ref

compensated reference voltage of 4.2 V and R9 is an

external resistor connected between SLPE and V .

The preferred value for R9 is 20 W. Changing the

value of R9 will also affect microphone gain, DTMF

gain, gain control characteristics, side-tone level, the

1 234 5 6 7...11

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与ILA1068相关器件

型号	品牌	获取价格	描述	数据表
ILA1068N	ETC	获取价格	Versatile Telephone Transmission Circuit with Dialler Interface
ILA1185A	INTEGRAL	获取价格	TRIAC PHASE ANGLE CONTROLLER
ILA1185A	IKSEMICON	获取价格	TRIAC PHASE ANGLE CONTROLLER
ILA1185A_11	IKSEMICON	获取价格	TRIAC PHASE ANGLE CONTROLLER
ILA1238NS	INTEGRAL	获取价格	AM/FM MONO RECEIVER
ILA1519	ETC	获取价格	2 x 6 Watt Stereo Car Radio Power Amplifier
ILA1519B	INTEGRAL	获取价格	2 X 6 WATT STEREO CAR RADIO POWER AMPLIFIER
ILA1519B1	INTEGRAL	获取价格	2 X 6 WATT STEREO CAR RADIO POWER AMPLIFIER
ILA19002	INTEGRAL	获取价格	SINGLE PHASE BIDIRECTIONAL POWER/ENERGY METERING IC WITH INSTANTANEOUS PULSE OUTPUT
ILA2003	INTEGRAL	获取价格	10W AUDIO AMPLIFIER

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