PBL38573 ERICSSON | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 15
Technical content
feed. Maximum line current less than 130 mA in DIL package (100 mA in SO package). It is designed to accomodate either a low impedance dynamic or an electret microphone. compensation can be adjusted or shut off in low gain mode with external resistors. supply is provided to feed microphones and diallers.
- Impedance to the line and radio interference suppression
- Transmitter gain and frequency responce network
- Receiver gain and frequency responce network
- Minimum number of external components for function,with one filte- red DC-supply. 6 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 - 130mA (DIP), down to 2 V.
- Differential microphone input for good balance to ground.
- Balanced receiver output stage.
- Stabilized DC - supply for low current CMOS diallers and electret microphones.
- Short start up time.
- Excellent RFI performance.
- In 14- pin DIP and SO packages.
Figure 1. Functional diagram.
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 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 R g = 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) DC-supply voltage, note 4 2 I L = 20 - 100 mA Pin 7 I DC = 0 mA 2.1 2.35 2.6 V IDC = 2 mA 1.95 2.2 2.6 V DC-supply voltage, pin 7 4 V DC = 2.35 V 0.1 µA leakage current (no supply) 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 fig. 8).
Figure 5. Pin configurations. signal is used to drive a side tone balancing network. 3 TI Input of transmit amplifier. Input impedance 17 kohm ± 20 %. about 1 mA). The +C pin shall be connected to a decoupling capacitor of 47 µF to 150 µF. 5 Mute Maximum voltage (to mute) is 0.3 V, current sink requirement of external driver is 100 µA. 6 GR Input of the gain regulation with line length. 7 DCO Output of the auxiliary DC-supply. 8 MO Output of the microphone amplifier or DTMF-amplifier.
9 MI 1
Microphone amplifier Inputs. Input impedance 1.7 kohm ± 20 %.
10 MI 2
11 -L The negative power terminal, connected to the line through a polarity guard diode bridge. 12 RI Input of receiver amplifier. Input impedance 38 kohm ± 20 %.
13 RE 1
Receiver amplifier outputs. Output impedance is approximately 3 ohm.
14 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 )
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. Figure 9. Microphone amplifier output clipping. Figure 10. Microphone solutions. Balanced electret microphone.
Figure 27. Typical standard telephone application. ( Testboard TB 132 T )
6 VSS
10 HKS
to maintain the quick start feature. Package Temp. Range Part No.