UBA1706TS データシートの表示（PDF） - Philips Electronics

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UBA1706TS

Cordless telephone line interface

Philips Electronics 

Philips Semiconductors

Cordless telephone line interface

Objective specification

UBA1706

The UBA1706 offers the possibility to choose two kinds of

regulations for the DC characteristic between line

terminals LN+ and LN− (see Fig.7):

• Voltage regulation mode

• Current regulation mode.

handbook, halfpage

Vline

(1)

(2)

(3)

Iline

Ilow

Iknee

Iprot (4)

MGK710

(1) Low voltage area.

(2) Small slope (determined by RSLPE).

(3) Small slope (dashed line; determined by RSLPE) in voltage

regulation mode.

High slope (full line; determined by RSLPE, RLVI and RRGL) in

current regulation mode.

(4) Current limitation.

Fig.7 General form of the DC mask as a function

of the regulation mode.

Therefore, VCE (TNSW) ≅ RLVI × ILVIV = 200 mV in a typical

application (see Fig.15).

The slope ∆Vline/∆Iline of the Vline, Iline characteristic is

RREGV ≅ RSLPE.

Current regulation mode

In current regulation mode (bit CRC at logic 1), when the

line current is lower than Iknee = 35 mA (with

ZSET = 619 Ω), VCE (TNSW) is fixed by means of a 200 nA

DC constant current ILVIV flowing through RLVI. When the

line current is higher than 35 mA, an additional current

(proportional to the line current) flows through RLVI. As a

result, TNSW works as a DC voltage source increasing with

the line current. VCE (TNSW) can be calculated as follows:

VCE

( TNSW)

≅ RLVI ×







R--R---S-R--L-G--P--L-E-

×

( Iline

–

Iknee)

+



ILVIV

Where:

Iline = line current

RRGL = resistor connected at pin RGL.

In a typical application (see Fig.15), the slope ∆Vline/∆Iline

of the Vline, Iline characteristic is determined by the ratio of

the resistors connected at pins SLPE, LVI and RGL, as

follows:

RREGC ≅ RSLPE + RLVI × R--R---S-R--L-G--P--L-E- = 1400 Ω .

Current limitation

Whatever the selected mode is, the line current is limited

to approximately 145 mA; this current is sensed on SLPE.

For this purpose, the external Zener diode must be

connected between pins LN and SLPE. The speech

function no longer operates in this condition.

The regulation mode is selected by bit CRC via the serial

interface.

The DC mask regulation is realised by adjusting the DC

voltage VCE (TNSW) across pin GND and line terminal LN−

as a function of the line current.

Voltage regulation mode

In the voltage regulation mode (bit CRC at logic 0), the

VCE (TNSW) voltage is fixed by means of a 200 nA DC

constant current ILVIV flowing through RLVI.

ELECTRONIC HOOK SWITCH CONTROL (PIN EHI)

The electronic hook switch input (EHI) controls the state of

transistor TPDARL. When the voltage applied at pin EHI is

LOW, transistor TPDARL is turned off. The voltage at

pin LCC is pulled up to supply voltage (VCC). Transistors

TNSW and TNON-HOOK are also turned off by means of a

pull-down resistor (RPD). When the voltage applied at

pin EHI is HIGH, transistor TPDARL is driven by the

operational amplifier at pin LCC and the regulation mode

selected is operating. An internal 165 kΩ pull-up resistor is

connected between pins LCC and VCC.

1999 Jun 04

10

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