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PBL3726-18A

Ericsson
Part Number PBL3726-18A
Manufacturer Ericsson
Description Universal Speech Circuit
Published May 6, 2014
Detailed Description March 1996 PBL 3726/18A Universal Speech Circuit Description PBL 3726/18A is a standard version of the PBL 3726 family...
Datasheet PDF File PBL3726-18A PDF File

PBL3726-18A
PBL3726-18A

Overview
March 1996 PBL 3726/18A Universal Speech Circuit Description PBL 3726/18A is a standard version of the PBL 3726 family of the mask-programmable, monolithic integrated speech circuits for use in electronic telephones.
It is designed for use with a low impedance microphone.
Transmitting and receiving gain is regulated with line length.
Different regulation for various current feeds can be set by external resistors.
Typical current feeds as 48 V, 2 x 200 ohm, 48 V 2 x 400 ohm and 48 V 2 x 800 ohm can be handled.
Application dependent parameters such as line balance, side tone level, amplification and frequency response are set by external components.
Parameters are set independently which means easy adoption for various market needs.
Key Features • Minimum number of inexpensive external components, 7 capacitors and 11 resistors.
• Mute function for operation with DTMF-generator.
• Transmit and receive 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.
• Short start-up time.
• Stabilized DC-supply for low current CMOS diallers and/or electret microphones.
1 DTMF input 10 PBL 3726/18 AD AT AR • DTMF-input controlled by mute.
17 12 13 DC 8 DC output for external CMOS device Mute (active low) 9 7 Sense Input 6 5 11 3 2 15 16 14 4 5 2 4 1 IC13(891176)A P Control output 3 B L 37 18-pin plastic DIP 20-pin plastic SO + 26 P B L 37 26 /1 8 1 2 3 4 5 Impedance to line and radio interference suppression.
Transmit gain and frequency response network.
Receive gain and frequency response network.
Side tone balance network.
DC-supply components.
Figure 1.
Functional diagram.
DIP package.
http://www.
Datasheet4U.
com/ /1 AM 8 18 Telephone line PBL 3726/18A Maximum Ratings Parameter Line voltage, tp = 2 s Line current, continuous DIP Line current, continuous SO package Operating temperature r...


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