TELEPHONE SPEECH CIRCUIT WITH MULTIFREQUENCY TONE GENERATOR INTERFACE

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TELEPHONE SPEECH CIRCUIT WITH MULTIFREQUENCY TONE GENERATOR INTERFACE

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LS256
TELEPHONE SPEECH CIRCUIT WITH MULTIFREQUENCY TONE GENERATOR INTERFACE
PRESENTS PROPER PATH LINE CURRENT HANDLES VOICE SIGNAL, PERFORMING WIRES INTERFACE CHANGING GAIN BOTH SENDING RECEIVING AMPLIFIERS COMPENSATE LINE ATTENUATION SENSING LINE LENGTHTHROUGH LINE CURRENT ACTS LINEAR INTERFACE SUPPLYING STABILIZED DIGITAL CHIP DELIVERING LINE TONE GENERATED DIALER
DIP16
ORDERING NUMBER LS256B
DESCRIPTION LS256 monolithic integrated circuit 16lead dual in-line plastic package replace hybrid circuit telephone set. works with same type transdurcers both transmitter receiver (typically piezoceramic capsules, dePIN CONNECTION (top view)
vice work also with dynamic ones). Many electrical characteristics controlled means external components meet different specifications. addition speech operation, LS256 acts interface tone signal.
June 1993
LS256
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol Ptot Tstg, Forward Line Current Reverse Line Current Total Power Dissipation Tamb 70°C Operating Temperature Storage Junction Temperature Parameter Line Voltage (3ms pulse duration) Value Unit
THERMAL DATA
Symbol j-amb Parameter Thermal Resistance Junction-ambient Value Unit °C/W
LS256
TEST CIRCUITS
Figure
Figure
0,1V CMRR
Side tone
LS256
Figure Figure
ELECTRICAL CHARACTERISTICS (refer test circuits, (a), Tamb 50oC, 3400Hz, unless otherwise specified)
Symbol CMRR Parameter Line Voltage Test Conditions Tamb 25°C 1kHz, 80mA Tamb 25°C, 1kHz 12mA 20mA 80mA 52mA 25mA Min. Typ. Max. 12.2 -68.5 Unit Fig. SPEECH OPERATION
Common Mode Rejection Sending Gain
Sending Gain Flatness Sending Distortion Sending Noise Microphone Input Impedance 1-16 Sending Loss Operation Receiving Gain
2mV, fref 1kHz 80mA 1kHz 1.3V 80mA 40mA; 2mV, 80mA 52mA 25mA 0.3V, 1kHz, Tamb 25°C 52mA 25mA 0.3V, fref 1kHz 80mA 1kHz 12mA 1.6V 12mA 1.9V 50mA 1.8V 50mA 2.1V 80mA; 50mV, 40mA
dBmp
Receiving Gain Flatness Receiving Distortion
Receiving Noise Receiver Output Impedance 12-13
LS256
ELECTRICAL CHARACTERISTICS (continued)
Symbol Sidetone Parameter Test Conditions 1kHz, Tamb 25°C, 52mA 25mA 0.3V, 1kHz 80mA 80mA 80mA 80mA 80mA, 1kHz 80mV 80mV 80mV 110mV 80mA 80mA Speech Operation Operation 80mA 80mA, Min. Typ. Max. Unit Fig. SPEECH OPERATION (continued)
Line Matching Impedance
MULTIFREQUENCY SYNTHESIZER INTERFACE Supply Voltage (standby operation) Supply Current Stand Operation Amplifier Gain Input Voltage Level (pin Input Impedance (pin Distortion Starting Delay Time Muting Threshold Voltage (pin Muting Stand Current (pin Muting Operating Current (pin
3VDD
LS256
DIP16 PACKAGE MECHANICAL DATA
DIM. Min. 1.27 2.54 17.78 0.130 0.050 0.51 0.77 0.25 0.335 0.100 0.700 0.280 0.201 1.65 Typ. Max. Min. 0.020 0.030 0.020 0.010 0.787
DIP16.TBL
inch Typ. Max.
0.065
PM-DIP16.EPS
LS256
Information furnished believed accurate reliable. However, SGS-THOMSON Microelectronics assumes responsibility consequences such information infringement patents other rights third parties which result from use. license granted implication otherwise under patent patent rights SGS-THOMSON Microelectronics. Specifications mentioned this publication subject change without notice. This publication supersedes replaces information previously supplied. SGS-THOMSON Microelectronics products authorized critical components life support devices systems without express written approval SGS-THOMSON Microelectronics. 1994 SGS-THOMSON Microelectronics Rights Reserved SGS-THOMSON Microelectronics GROUP COMPANIES Australia Brazil France Germany Hong Kong Italy Japan Korea Malaysia Malta Morocco Netherlands Singapore Spain Sweden Switzerland Taiwan Thaliand United Kingdom U.S.A.

TELEPHONE SPEECH CIRCUIT WITH MULTIFREQUENCY TONE GENERATOR INTERFACE

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