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UBA1706 Datasheet(PDF) 10 Page - NXP Semiconductors |
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UBA1706 Datasheet(HTML) 10 Page - NXP Semiconductors |
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10 / 28 page  1999 Jun 04 10 Philips Semiconductors Objective specification Cordless telephone line interface 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. 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. Fig.7 General form of the DC mask as a function of the regulation mode. (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. handbook, halfpage MGK710 Vline Iline Iprot (4) Iknee Ilow (1) (2) (3) 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: 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: . 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. 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 k Ω pull-up resistor is connected between pins LCC and VCC. V CE TNSW () R LVI R SLPE R RGL ---------------- I line I knee – () I LVIV + × × ≅ R REGC R SLPE R LVI R SLPE R RGL ---------------- 1400 Ω = × + ≅ |
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