PBL38582

PBL 385 82 December 1999 PBL 38582 Telephone Line interface circuit for DECT, DAM, CT Unisolated or Isolated Description PBL 38582 is a monolithic bipolar integrated circuit for use as telephone line interface in unisolated or isolated DECT and other cordless telephone residential base stations and in analog / digital answering machines or as seco

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nd line in an unisolated DECT telephone base station. Transmit and receive gains are set by external components. On / Off switchable gain, related to line, regulation for different current feeds can be set by external resistors. Typical current feeds as 48 V, 2 • 200 ohm, 48 V 2 • 400 ohm and 60 V 2 • 600 ohm can be handled. Application dependent parameters such as line balance, impedance to the line and frequency response are set by external components. Parameters are set independently which results in an easy adoption for various market needs. Key Features • Minimum number of inexpensive external components, 5 capacitors and 4 resistors. • Current range 5 - 130 mA(DIL), 5 - 100 mA(20-pin SO) 5 - 70 mA(16-pin SO) 385 82/2 • Operation voltage range down to 2 V. • Short start-up time. P B L 3 8 5 8 1 PBL 38582 Fast start - up P B L 18 38 20-pin plastic SO DC supply + 6 3 2 15 5, 14,16 RECEIVE Reference 17 Limiter 5 4 1 2 TRANSMIT P B 18-pin plastic DIP Figure 1. Functional diagram. DIP package. L 38 Telephone line 58 2 82 2 16-pin plastic SO 1 PBL 385 82 Maximum Ratings Parameter Symbol Min Max Unit Line voltage, tp = 2 s Line current, continuous DIP Line current, continuous SO-20 package Line current, continuous SO-16 package Operating temperature range Storage temperature range No input should be set on higher level than pin 15.(+C) VL IL IL IL PBL 38582/2 TAmb TStg 0 0 0 0 -40 -55 18 130 100 70 +70 +125 V mA mA mA °C °C R = 0-4kΩ L 0 ohm when artificial line is used 5H+5H R feed = 400Ω+400Ω 310 Ω + C ARTIFICIAL LINE IL + LINE 350 Ω V4 output Receiver + E = 48.5V V2 600Ω V L PBL 38582 with external components See fig. 4 V1 C = 1µF when artificial line is used 470µF when no artificial line V3 Transmitter input - LINE Figure 2. Test set up without rectifier bridge. 5H+5H R RL = 0 - 4 k Ω Uz= 15-16V IL 310 Ω + LINE 350 Ω feed = 400Ω+400Ω 1µF V2 + PBL 38582 with external components See fig. 4 V4 output Receiver + E = 50.0V 600Ω V L V1 - LINE V3 Transmitter input Figure 3. Test set up with rectifier bridge. 1 +Line PBL 38582 Fast start - up 18 Receiver output 17 Limiter Reference DC supply + 6 3 C3 2 15 5, 14,16 C4 4 Figure 4. Circuit with external components for test set up. R1 = 6.2 k R2 = 62 k R6 = 75 Ω R3 = 909 Ω R14 = 10k C1 = 68 µF C2 = 15 nF C3 = 0.1µF C4 = 47 nF DIP package pinning. Transmitter input R13 R14 R6 R1 R2 R3 C2 C1 -Line 2 PBL 385 82 Electrical Ch