PBL38541 ERICSSON | Alldatasheet
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Technical content
microphones,diallers and other more current consuming functions like handsfree systems. Pin numbers in this datasheet refer to 18-pin DIP package unless otherwhise noted. Figure 1. Functional diagram DIP package.
- Minimum number of external components, with two filtered DC- supplies, 7 capacitors and 11 resistors.
- Easy adaption to various market needs.
- Mute control input for operation with DTMF - generator.
- A separate signaling input for payphone and DTMF tones controlled by mute.
- Transmitter and receiver gain regulation for automatic loop loss compensation.
- Extended current and voltage range 4 - 130 mA, down to 2 .2V.
- Differential microphone input for good balance to ground.
- Balanced receiver output stage.
- One stabilized DC - supply for low current CMOS diallers and or electret microphones. One settable current limited supply with 6 mA max. current.
- Short start up time.
- Excellent RFI performance.
- 18 - pin DIP and 20 - pin SO packages. 142311 AM AT AR 15 4+ 10 AD PBL 385 41 DTMF input Mic. DC-supply Mute (active low) DC2 - output for external devices Telephone line 4 3 1 Gain regulation DC1 - output for external devices 1. Impedance to the line and radio interference suppression 2. Transmitter gain and frequency responce network 3. Receiver gain and frequency responce network 4. Sidetone balance network 5. DC supply components November 1998 20-pin plastic SO PBL 385 41 PBL 385 41 18-pin plastic DIP
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 20 • 10 log (V2 / V3); 1 kHz 2R L = 0 41 43 45 dB 2R L = 400 Ω 43.5 45.5 47.5 dB 2R 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 Transmitter input impedance, pin 3 2 1 kHz 13.5 17 20.5 k Ω Microphone input impedance 2 1.7//(2.7) note 3 k Ω 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 20 • 10 log (V4 / V1); 1 kHz 2 RL = 0 Ω -18.5 -16.5 -14.5 dB
2 RL = 400 Ω -16 -14 -12 dB
2 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) DC 1 -supply voltage 2 I L = 20 - 100 mA Pin 9 R 17 = 4k; IDC1 =2 mA 3.4 3.7 4.0 V DC 2-supply voltage 2 I L = 20 - 100 mA Pin 8 I DC = 0 mA 2.1 2.35 2.6 V IDC = 2 mA 1.95 2.2 2.6 V DC-output pin 8 input 4 V DC = 2.35 V 0.1 µA leakage current (no supply) DTMF transmitting gain 2 V M = 0.3 V, 1 kHz 24.5 26.5 28.5 dB DTMF input impedance 2 1 kHz 20 25 30 k Ω 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. 4. The DC output voltage is reduced at low line voltage (see page 8).
Figure 5. Pin configuration. signal is used to drive a side tone balancing network. 3 3 TI Input of the transmitter amplifier. Input impedance 17 kohm ± 20 %. consumption). The +C pin must be connected to a decoupling capacitor of 47 µF to 150 µF. 0.3 V, current sink requirement of external driver is 50 µA. 6 6 GR Control input for the gain regulation function. 7 7 DCS 1 Control input to the DC1-supply. A resistor to -line sets the maximum current load of the supply. 8 8 DCO 2 Output of the DC2-supply. 9 9 DCO 1 Output of the DC1-supply. 10 12 DI Input for the DTMF-signal. Input impedance 25 kohm ± 20 %. 11 13 MO Output of the microphone amplifier or DTMF-amplifier. Inputs to the microphone amplifier. Input impedance 1.7 kohm ± 20 %. 14 16 -L The negative power terminal, connected to the line through a polarity guard diode bridge. 15 17 RI Input of receiver amplifier. Input impedance 38 kohm ± 20 %. 16 18 DR Control input for the receiver amplifier driving capability. Receiver amplifier outputs. Output impedance is approximately 3 ohm.
10 Not connected
11 Not connected
Figure 8. DC-Characteristics. (R6=75Ω ) dynamic or electret transducers. See fig.
- An electret microphone with a built in
resulting among other things in a bad mute. maximum symmetrical unclipped output. symmetrical signal clipping on the line.
Figure 9. Microphone amplifier output clipping. Figure 10. Microphone solutions. Balanced electret microphone. for cutting the high end of frequency band is best to be placed directly at the microphone where it also will act as a RFI suppressor. 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.
b. Supply arrangement for a call monitor cicuit. of DC-characteristic is set. See fig. 8. calculate ; actual line voltage minus 1.9V.
- The set current will flow constant
payphones its auxiliary functions. Figure 18. DC - supply system for external loads. in some telephone specifications.
75Ω 910Ω 560Ω 11k 100n 6.2k 11k 10Ω 62k 47µF 15n 910Ω 47n 1-10M MIC. 1µF 220Ω 220ΩCMOS DIALLER 123 45 6 78 9 0 #* DTMF 12 MUTE 9 VDD GND 100Ω 100Ω Hook switch Telephone line 10Ω 1µF 10n 100Ω Rec. 3.3n 680p 33k 15V 9 6 Gain regulation DC-supply 47µF R2a+ 47µF C11 R17 1W4k R2b Figure 24. Typical DTMF tone dialling telephone ( DIP package pinning ).
Ordering Information
Package Temp. Range Part No. Plastic DIP -40 to +70 °C PBL 385 41/1N Plastic SO -40 to +70 °C PBL 385 41/1SO Plastic SO -40 to +70 °C PBL 385 41/1SO:T Ericsson Components AB S-164 81 Kista-Stockholm, Sweden Telephone: +46 8 757 50 00 Specifications subject to change without notice. 1522-PBL 385 41/1 Rev.A © Ericsson Components AB November 1998 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.