 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| L3280 LOW VOLTAGE TELEPHONE SPEECH CIRCUIT .OPERATI .DTMF&BEEPTONEI .EXTERNAL .MUTE .SUI ADVANCE DAT A ON DOWN TO 1.3 V/5 mA NPUTS MUTING FOR EARPHONE AND MICROPHONE TURNS ON BEEP TONE & DTMF INPUTS AND TURNS OFF EARPHONE & MICROPHONE TABLE FOR DYNAMIC OR PIEZO EARPHONES AND PIEZO, DYNAMIC OR ELECTRET MICROPHONES DIP14 DESCRIPTION The L3280is a brand new low voltage speech circuit designed to replace hybrid circuits in telephonesets. It is designed for sets that may be operated in parallel. It features both DTMF input and Beep tone input ; ALC on send and receive and muting input. Various DC - characteristics can be programmed at pin 14 replacing testing resistor (43) with proper network value. PIN CONNECTION (top view) ORDERING NUMBER : L3280AB June 1993 This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice. 1/8 L3280 BLOCK DIAGRAM ABSOLUTE MAXIMUM RATINGS Symbol VL IL Ptot Top Tj Line Voltage (3 ms pulse) Line Current Total Power Dissipation, Tamb = 70 C Operating Temperature Junction Temperature Parameter Value 20 150 1 - 20 to 55 - 65 to 150 Unit V mA W C C THERMAL DATA Symbol Rth j-amb Parameter Thermal Resistance Junction-ambient Max Value 80 Unit C/W 2/8 L3280 Figure 1 : Test Circuits. Figure 2 . Figure 3. Receiving gain GR = VRO VRI Sending gain and sidetone : GS = VSO ; ST = VRO VMI VMI 3/8 L3280 ELECTRICAL CHARACTERISTICS (Tamb = 25oC ; f = 1kHz ; IL = 20mA : mute low ; R1 (pin 14) = 43, unless otherwise specified) Symbol VL VL VL CMRR GS DGS THDS N TX ZMI GR D GR THDR NRX ZRO Line Voltage Line Voltage Line Voltage Common Mode Rej. Ratio Sending Gain Delta Sending Gain Sending Distortion Sending Noise Mic. Input Impedance Receiving Gain Delta Receiving Gain Receiving Distortion Receiving Noise Receiving Output Imped. Sidetone ZML VL VSO IRO Line Match. Impedance Line Voltage Sending Output Voltage Rec. Output Current OPERATION @ IL = 16 mA MULO MUHI GMF RMF THDMF Gbeep R beep THD DVL GBACK Mute Input Low Mute Input High DTMF Gain DTMF Input Impedance DTMF Distorsion Beeptone Gain Beeptone Input Imped. Beeptone Distorsion DELTA VLINE Back Tone Gain (speaking mode) (dialling mode) Vin = 2 mV ; Mute = 2 V Mute = 2 V Mute = 2 V ; Vin = 25 mV Mute = 2 V ; Vin = 25 mV Mute = 2 V Mute = 2 V ; VBt = 100 mV Mute = 2 V ; IL = 20 mA 0.5 - - 12 5 1.2 -3.0 8.5 2 25 6 26.5 8.5 5 28 1 V V dB K % dB K % V dB VMI = 2 mV, IL = 20 mA IL = 70 mA, VMI = 2 mV VSO = 700 mV IL = 50 mA, VMI = 0 V VMI = 2 mV IL = 20 mA, VRI = 0.2 V IL = 70 mA, VRI = 0.2 V VRO = 615 mV VRI = 0 V R1 = 200 , VRO = 50 mV VMI = 2 mV VRI = 0.2 V IL = 5.5 mA IL = 5.5 mA, THD = 5 % IL = 5.5 mA, THD = 5 % 100 0.7 500 300 10 40 600 1.5 700 1.8 40 7.7 -7 9.2 - 5.5 10.7 -4 5 - 71 Parameter Test Conditions IL = 20 mA IL = 50 mA IL = 80 mA 50 47.8 -7 49.3 - 5.5 50.8 -4 5 Min. Typ. 3.05 5.8 8.5 Max. 3.35 6.2 10 Unit V V V dB dB dB % dBm K dB dB % V dB V mV mA 4/8 L3280 CHARACTERISTIC AT 1 KHZ Figure 4 : Receive Characteristic and Max Output at 2 % THD. Figure 5 : Sending ALC Characteristic and Max Output at 2 % THD. Figure 6 : DC Characteristic Measured between Line and GND. LOGIC OF MUTE SWITCHING DTMF MUTE H MUTE L ACTIVE TO LINE OUTPUT MUTED BEEP ACTIVE TO EARPHONE OUTPUT MUTED MIC INPUT MUTED ACTIVE RECEIVE INPUT MUTED ACTIVE 5/8 L3280 Figure 7 : Application Circuit for Dynamic Transducer. 6/8 L3280 DIP14 PACKAGE MECHANICAL DATA DIM Min. a1 B b b1 D E e e3 F i L Z 1.27 3.3 2.54 0.050 8.5 2.54 15.24 7.1 5.1 0.130 0.100 0.51 1.39 0.5 0.25 20 0.335 0.100 0.600 0.280 0.201 1.65 mm Typ. Max. Min. 0.020 0.055 0.020 0.010 0.787 DIP14.TBL inch Typ. Max. 0.065 7/8 PM-DIP14.EPS L3280 Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. (c) 1994 SGS-THOMSON Microelectronics - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thaliand - United Kingdom - U.S.A. 8/8 |
Price & Availability of L3280
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |