LOW VOLTAGE TELEPHONE SPEECH CIRCUITS
L3281
LOW VOLTAGE TELEPHONE SPEECH CIRCUITS
PRELIMINARY DATA
OPERATION DOWN TO 1.6V / 6.5mA DTMF & BEEP TONE INPUTS EXT...
Description
L3281
LOW VOLTAGE TELEPHONE SPEECH CIRCUITS
PRELIMINARY DATA
OPERATION DOWN TO 1.6V / 6.5mA DTMF & BEEP TONE INPUTS EXTERNAL MUTING FOR EARPHONE AND MICROPHONE SUITABLE FOR DYNAMIC EARPHONE AND DYNAMIC OR ELECTRET MICROPHONE AGC CONTROL ON BOTH SENDING AND RECEIVING
DIP14
SO14
DESCRIPTION The L3281 is an electronic speech circuit developed to replace hybrid circuits in telephone sets that can be operated in parallel with other phones. BLOCK DIAGRAM
ORDERING NUMBERS: L3281AB L3281AD1
June 1993
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This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
L3281
PIN CONNECTION (top view)
ABSOLUTE MAXIMUM RATINGS
Symbol VL IL Ptot Top Tj Parameter Line Voltage (3 ms pulse) Line Current Total Power Dissipation, Tamb = 55°C Operating Temperature Junction Temperature 1.0 – 20 to 55 – 65 to 150 Value DIP-14 15 150 0.6 SO-14 Unit V mA W °C °C
THERMAL DATA
Symbol Rth j-amb Parameter Thermal Resistance Junction Ambient Max Value DIP-14 90 SO-14 130 Unit °C/W
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L3281
TEST CIRCUITS Figure 1.
Figure 2.
Figure 3.
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L3281
ELECTRICAL CHARACTERISTICS IL = 20 to 100mA; R4 =( 51Ω // diode) + 33Ω; T = 25°C; f = 1kHz; Unless Otherwise Specified
Symbol Vl Parameter Line Voltage IL IL IL IL Test Condition = 6.5mA = 20mA = 50mA = 80mA 50 Vmi = 10mV; IL = 20mA Vmi = 10mV; IL = 70mA Vso = 700mV; IL = 20mA Vmi = 0V; IL = 50mA Vmi = 10mV IL = 20mA; Vri = 0.2V IL = 70mA; Vri = 0.2V Vro = 350mV; Load = 35...
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