PBL38571 ERICSSON | Alldatasheet
Document overview
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Technical content
- Impedance to the line and radio interference suppression
- Transmitter gain and frequency responce network
- Receiver gain and frequency responce network
Figure 1. Functional diagram.
- Minimum number of external components, 5 capacitors and 10 resistors.
- Easy adaption to various market needs.
- Mute control input for operation with DTMF - generator.
- Transmitter and receiver gain regulation for automatic loop loss compensation. Disconnectable.
- Extended current and voltage range 5 - 130 mA, down to 2 V.
- Differential microphone input for good balance to ground.
- Balanced receiver output stage.
- In 16 - pin DIP and SO BW batwing packages.
- Short start up time.
- Excellent RFI performance. PBL 38571 PBL38571
At TAmb = + 25° C. No cable and line rectifier unless otherwise specified. Ref. Parameter fig. Conditions Min Typ Max Unit Line voltage, VL 2I L = 15 mA 3.3 3.7 4.1 V 2I L = 100 mA 11 13 15 V Transmitting gain, note 1 2 20 • 10 log (V2 / V3); 1 kHz No gain regulation, low mode R g = 20kΩ 41 43 45 dB Transmitting gain, note 1 2 20 • 10 log (V2 / V3); 1 kHz With gain regulation R L = 0, RG = ∞ 41 43 45 dB R L = 400 Ω 43.5 45.5 47.5 dB R L = 900 Ω - 2.2 kΩ 46 48 50 dB Transmitting range of 2 1 kHz, R L = 0 to 900 Ω 3 5 7 d B regulation Transmitting frequency 2 200 Hz to 3.4 kHz -1 1 dB response Microphone input impedance 2 1.7//(2.7) note 3 kΩ Transmitter input impedance 2 1 kHz 13.5 17 20.5 k Ω pin 3 Transmitter dynamic output 2 200 Hz - 3.4 kHz 1.5 Vp ≤ 2% distortion, IL = 20 - 100 mA Transmitter max output 2 200 Hz - 3.4 kHz 3 Vp IL = 0 - 100 mA, V3 = 0 - 1 V Transmitter output noise 2 Psoph-weighting, Rel 1 Vrms, RL = 0 -75 dBPsoph Receiving gain, note 1 2 20 • 10 log (V4 / V1); 1 kHz No gain regulation, low mode Rg ™ = 20kΩ -18.5 -16.5 -14.5 dB Receiving gain, note 1 2 20 • 10 log (V4 / V1); 1 kHz With gain regulation R L = 0, RG = ∞ -18.5 -16.5 -14.5 dB RL = 400 Ω -16 -14 -12 dB RL = 900 Ω - 2.2 kΩ -13.5 -11.5 -9.5 dB Receiving range of regulation 2 1 kHz, R L = 0 to 900 Ω 3 5 7 dB Receiving frequency response 2 200 Hz to 3.4 kHz -1 1 dB Receiver input impedance 2 1 kHz, 38 k Ω Receiver output impedance 2 1 kHz, 3(+310)note 3 Ω Receiver dynamic output 2 200 Hz - 3.4 kHz 0.5 V p note 2 ≤ 2% distortion, IL = 20 - 100 mA Receiver max. 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 1V rms, with cable -85 dB A 0 - 3 km, Ø = 0.4 mm 0 - 5 km, Ø = 0.5 mm, Mute input voltage 2 0.3 V at mute (active low) pin 7. Notes 1. Adjustable to both higher and lower values with external components. 2. The dynamic output can be doubled, see applications information. 3. External resistor in the test set up.
Figure 5. Pin configurations. 1 +L Output of the transmitter amplifier. Connected to the line through a polarity guard diode bridge. to drive a side tone balancing network. 3 TI Input of transmitter amplifier. Input impedance 17 kohm ± 20 %.
- L Negative power terminal, connected to the line through a polarity guard diode bridge.
consumption). The +C pin should be connected to a decoupling capacitor of 47 µF to 150 µF. 7 Mute Mute input. Maximum voltage (to mute) is 0.3 V, current sink requirement of external driver is 100 µA. 8 GR Input for the gain regulation control circuitry. 9 MO Output of the microphone amplifier.
10 MI 1
Inputs of the microphone amplifier. Input impedance 1.7 kohm ± 20%.
11 MI 2
14 RI Input of receiver amplifier. Input impedance is 38 kohm ± 20 %.
15 RE 1
Receiver amplifier outputs. Output impedance approximately 3 ohms.
16 RE 2
when low values of R6 are considered. dynamic or electret transducers. See fig.
- An electret microphone with a built in
resulting among other things in a bad mute. microphones buffer amplifier. Figure 8. DC - Characteristics. (R6 =75Ω )
currents <≈10mA the first step should be to examine if the circuits DC characteristic can be adjusted upwards. How to calculate the gains in the transmitter channel. Microphone amplifiers first stage 19 dB. Figure 9. Microphone amplifier output clipping. Figure 10. Microphone solutions. Balanced electret microphone.
ding the resistance value of R3. See fig.6. Figure 18. Typical standard DTMF dialling telephone application. of DC-characteristic is set. See fig. 8.
S-164 81 Kista-Stockholm, Sweden Telephone: +46 8 757 50 00 Specifications subject to change without notice. 1522-PBL385 71 © Ericsson Components AB June 1999 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 writ- ing. 7 14 632 ARAT PBL 385 71 AM 910Ω 47µF C2 15nF R10 6.2k R11 62k R8 560Ω 910Ω 11k R12 11k 100nF 47nF 100nF 75ΩR5 22k 18k 4,5, 12,13 Tx in 15V +Line -Line Tx Rx Mute Mains grounded Telephone system grounded Cx =these capacitors must be of high voltage type Cx CxCx Cx Figure 24. Principal balanced solution for a transformerless line interface that can be used in case of two different ground systems with low disturbance levels.
Ordering Information
Package Temp. Range Part No. 16-pin Plastic BW DIP -40 to +70°C PBL 385 71/1NS 16-pin Plastic BW SO -40 to +70°C PBL 385 71/1SOS