PBL3852 Ericsson, PBL3852 Datasheet
PBL3852
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PBL3852 Summary of contents
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... The PBL 3852 is especially suitable to be used with Ericsson handsfree circuits like PBL 3786, PBL 3786/2, PBL 3881 and PBL 3880 thanks to a specific interfacing arrangement. ...
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PBL 3852 Maximum Ratings Parameter Line voltage Line current, continuous DIP Line current, continuous SO package Operating temperature range Storage temperature range Input level (all inputs 0- ohm when artificial line ...
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Electrical Characteristics cable and no line rectifier unless otherwise specified. Amb Ref. Parameter fig. Line voltage, V note Transmitting gain, note Transmitting range of 2 ...
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PBL 3852 Pin Description DIP SO Symbol Description Positive line terminal Slope setting for DC characteristic and sidetone balancing signal output Transmitter amplifier input Internal power supply 5 ...
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Functional Description Design procedure 1. Set the circuit impedance to the line, either 600 or complex. (R19 and C9). C9 should be big enough to give low impedance compared with R19 in the telephone speech frequency band. Too large C9 ...
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PBL 3852 Figure 8. DC-Characteristics Vref R circ . PIN 5.5 10 pin 5 if ...
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RC combination ought to be connected from the other input, pin 13, to ground. An electret microphone with a built in FET amplifier seen from outside as a high impedance constant current generator ...
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PBL 3852 Transmitter amplifier The transmitter amplifier in PBL 3852 consists of three stages. The first stage is an amplitude limiter for the input signal at TI, in order to prevent the transmitted signal to exceed a certain set level ...
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A capacitor is needed at the ...
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PBL 3852 This axis is the total gain, microphone-telephone-line-telephone station. dB The slope is = q/P q a=under comp. b=opt.comp. c=ower comp. approx. center of the regulation P/2 Regulation area 0 Figure 13. Line length regulation. In case no regulation ...
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Transmitter gain Full regulation - 1.00 1.05 Figure 15. Transmitter line length regulation. How to determine the voltage at pin GR for a certain line length 0 certain regulation ...
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PBL 3852 Dynamic limiter The dynamic limiter consists of a full wave rectifier that senses the signal amplitude on the line and produces a control signal that reduces the gain of the transmitter and the receiver when the signal on ...
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Figure 18. The dynamic limiter function Figure 19. Transmitter output signal limiter . See fig. 22 for data. Power down and input PD During pulse dialling or register recall (time controlled line break) the telephone line is interrupted, hence the ...
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PBL 3852 Figure 20. Power down input. Figure 21. Mute input. Mute function The circuit has a mute function at pin 6. By sourcing current into this pin will cut off the gain in the microphone amplifier (attenuation min. 60dB) ...
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R Line and the line feeding data of the exchange. A decoupling capacitor is needed between pins +C and -L. The V +C supply changes its voltage linearly with the line current. It can be used to feed ...
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PBL 3852 PBL 3852 DC2 - Figure 23. DC-2 supply of peripheral circuits and memory retention. Side tone suppression (see fig. 24, 26) The side tone suppression is achieved by adding two signals V+L and ...
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bal and C bal Figure 24. Sidetone balance. What is balancing the ...
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... See figure 29. This methode does not necessarily count out the RFI components that are recommended earlier. <47n 10-100 10-100 <47n PBL3852 Line Figure 28. RFI elimination at receiver amplifier output. ...
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... PC-board. 13). Connect components as close to the IC as possible. Connect especially decoupling capacitors close to the ground pin of the IC. The terminal circuits from Ericsson Components are manufactured in IC processes with large internal capacitors on the chip to counteract RFI disturban- ses in every possible way. The simplest method to test the ...
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PBL 3852 Mute R21 6 R24 C13 C12 R25 DC DC Ref. supply supply R23 DC1 DC2 Power C2 C3 down + + Component list for application with standard line ...
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DC-control Mute Ref. supply supply DC1 DC2 Power down + + Component list for application with line length regulation, 2x200 ...
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PBL 3852 DC-control R21 Mute 6 R24 C13 C12 R25 DC DC Ref. supply supply DC1 DC2 Power down Component list for application with soft ...
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18-pin dual in-line package inches Min. Max A 0.015 B 0.005 C 0.014 0.022 D 0.100 Typ. E 0.210 F 0.115 0.160 G 0.300 0.325 H 0.008 ...
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... No license is granted by implication or otherwise under any patent or patent rights of Ericsson Components. These products are sold only according to Ericsson Components' general conditions of sale, unless otherwise confirmed in writing. ...