PBL38570
Key Features
- Minimum number of external components, 7 capacitors and 11 resistors. Easy adaption to various market needs. Mute control input for operation with DTMF - generator. A separate input for DTMF tones controlled by mute. Transmitter and receiver gain regulation for automatic loop loss compensation. Extended current and voltage range 5 - 130 mA, down to 2 V. Differential microphone input for good balance to ground. Balanced receiver output stage. Stabilized DC - supplies for low current CMOS diallers and electret microphones. 18 - pin DIP and 20 - pin SO packages. Short start up time. Excellent RFI performance. * * * * * * * * * *
- 1 12 Mic. 13 DC-supply AM Telephone line 8 Mute (active low) 9 7 Sense input 6 5 11 3 2 15 16 14 +4 P 18 B L 1 AT AR 5 DC-output for external devices Gain regulation 4 2 3
- Line impedance and radio interference suppression.
- Transmit gain and frequency response network.
- Receive gain and frequency response network.
- Side tone balance network.
- DC-supply components. 20-pin plastic SO 18-pin plastic DIP Figure
- Functional diagram. DIP package. 1 P B L + + 38 57 0 38 DTMF input 10 AD 17 57
