PBL38582 ERICSSON | Alldatasheet
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Technical content
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 second 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.
Figure 1. Functional diagram. DIP package.
Electrical Characteristics
At TAmb = + 25° C. No cable and no line rectifier unless otherwise specified. IL = 100 mA is not valid for 16-pin SO package. Parameter Ref.fig. Conditions Min Typ Max Unit Line voltage, VL 2 IL = 15 mA 3.3 3.7 4.1 V 2I L = 100 mA 11 13 15 V Transmitting gain 20 •10 log (V 2 / V3); 1 kHz 24 25 26 dB Transmitting frequency 2 200 Hz to 3.4 kHz -1 1 dB response Transmitter dynamic output 2 200 Hz - 3.4 kHz 1.5 V p ≤ 2% distortion, IL = 20 - 100 mA Transmitter maximum output 2 200 Hz - 3.4 kHz 3 V p IL = 0 - 100 mA, V3 = 0 - 1 V Transmitter output noise 2 Psof-weighting, Rel 1 V rms, RL = 0 -75 dB Psof Transmitter input impedance 2 1 kHz 13.5 17 20.5 kohm pin 3 Receiving gain 20 • 10 log (V 4 / V1); 1 kHz Without gain regulation 2 R L = 0 - xxx ohm, R11= 10k -18.5 -16.5 -14.5 dB Receiving gain 20 • 10 log (V 4 / V1); 1 kHz, R11 not used With gain regulation 2 R L = 0 ohm, -18.5 -16.5 -14.5 dB 2R L = 400 ohm -16 -14 -12 dB 2R L = 900 ohm - 2.2 kohm -13.5 -11.5 -9.5 dB Receiving range of regulation 2 1 kHz, R L = 0 to 900 ohm 3 5 7 dB Receiving frequency response 2 200 Hz to 3.4 kHz -1 1 dB Receiver output impedance 2 1 kHz, without 310 Ω resistor 3 ohm Receiver dynamic output 2 200 Hz - 3.4 kH 0.5 V p note 1 ≤ 2% distortion, IL = 20 - 100 mA Receiver maximum output 3 Measured with line rectifier 0.9 V p 200 Hz - 3.4 kHz, IL = 0 - 100 mA, V1= 0 - 50 V Receiver output noise 2 A-weighting, Rel 1Vrms, with cable -85 dB A 0 - 5 km, Ø = 0.5 mm, 0 - 3 km, Ø = 0.3 mm Notes: 1. The dynamic output can be nearly doubled if the 310Ω series resistor is omitted.
polarity guard diode bridge. 2 2 2 TO Output of the transmitter amplifier. Connected through a resistor of 47 to 100 ohm to -L. the signal is used to drive a side tone balancing network. 3 3 3 TI Input of transmit amplifier. Input impedance 17 k Ω ± 20 %. capacitor of 47 µF to 150 µF. 6 6 6 GR The control input for the gain regulation in the receiver. 15 17 13 RI Input of the receive signal amplifier. Input impedance is 38 kohm ± 20 %. The receive signal amplifier outputs. Output impedance is approximately 3 ohm. Figure 5. Pin configuration.
15 RE1
Figure 6. AC-impedance. Design procedure; ref. to fig.4. interaction between the same is minimized.
- Set the circuit impedance to the line,
- Set the DC-characteristic that is
- Set the attac point where the line
- Set the transmitter gain and
- Set the receiver gain and frequency
response. See text how to limit the max.
- Adjust the side tone balancing
components in case necessary.
- Circuit protection. Apart from any
influence of C1 can not be neglected. a complex network. See fig. 6. In case a).
- The voltage of the feeding system ohms.
- The maximum current from the line at zero line length.
- The min. current at which the telephone has to work (basic function).
- The lowest and highest voltage permissible across the telephone set.
- The highest voltage that the telephone may have at different line currents. Normally set by the network owners specification.The lowest voltage for the telephone is normally set by the voltages that are needed for the different parts of the telephone to function. For ex. for transmitter output amplifier, recei- ver output amplifier, dialler, speech switching. R6 will set the slope of the DC-char. and the rest of the level is set by some constants in the circuit as shown in the equation below. The slope of the DC-char. will also influence the line length regulation (when used ) and thus the gain of both transmitter and receiver. See the table under gain regulation. R6 also acts as power protection for the circuit, this must be kept in mind when low values of R6 are conside- red. See fig. 7. V Line ≈ 2 + 1. 5⋅R 6⋅Iline V telephoneline≈ 1. 5V + V line +Line PBL 38 582 -Line Rs ≈1Ω How to connect a complex network. Example: a) b) c) 220Ω 820Ω C 220Ω +820Ω //C
Ordering Information
Package Temp. Range Part No. Plastic DIP -40 to +70 °C PBL 385 82/1NS Plastic SO20 -40 to +70 °C PBL 385 82/1SOS Plastic SO20 -40 to +70 °C PBL 385 82/1SOT Tape & Reel Plastic SO16 -40 to +70 °C PBL 385 82/2SOS Plastic SO16 -40 to +70 °C PBL 385 82/2SOT Tape & Reel Ericsson Components AB S-164 81 Kista-Stockholm, Sweden Telephone: (08) 757 50 00 Specifications subject to change without notice. IC4 (96087) B-Ue © Ericsson Components AB Information given in this data sheet is believed to be accurate and reliable. However no responsibility is assumed for the consequences of its use nor for any infringement of patents or other rights of third parties which may result from its use. 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. December 1999 Ordering number: