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| NJM2761 Audio Limiter s GENERAL DESCRIPTION The NJM2761 is the audio limiter for speaker protection. The limit level is adjustable by external resistor. It is suitable for PC, potable audio and others. s PACKAGE OUTLINE NJM2761RB2 s FEATURES q Wide Operating Voltage q Variable Limit Level by external resistor q Low Output Noise q Bipolar Technology q Package Outline +2.7V to +13.0V 0.2 to1V -90dBV max. TVSP10 s PIN CONFIGURATION 1 10 2 9 3 8 4 7 5 6 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. V+ OUTa INa INT VREF SENCE SW INb OUTb GND s BLOCK DIAGRAM Vcc Vref INa OUTa INb OUTb SW INT SENSE -1- NJM2761 sABSOLUTE MAXIMUM RATING (Ta=25C) PARAMETER Supply Voltage Power Dissipation Operating Temperature Range Storage Temperature Range SYMBOL V + RATINGS 14 320 -20 to +75 -40 to +125 UNIT V mW C C PD Topr Tstg sELECTRICAL CHARACTERISTICS + q POWER SUPPLY (Ta=25C, V =5V unless otherwise specified) PARAMETER Operating Voltage Operating Current Reference Voltage SYMBOL V + TEST CONDITION No Signal No Signal MIN. 2.7 2.2 TYP. 5.0 1.5 2.5 MAX. 13.0 2.0 2.7 UNIT V mA V ICC Vref q AC CHARACTERISTICS + (Ta=25C, V =5V, VIN=1Vrms/f=1kHz, Rsense=20k, BW=400-30kHz unless otherwise specified) PARAMETER Limit Level 1 Limit Level 2 Limit Off Output Noise Total Harmonic Distortion Cross Talk Ripple Rejection SYMBOL GLIM1 GLIM2 GOFF VNO THD+N CT RR Vripple=100mVrms, f=1kHz + TEST CONDITION MIN. 150 TYP. 200 1.0 1.0 -100 (10) - MAX. 250 1.3 1.1 -90 (31.6) 1 -70 -70 (316) UNIT mVrms Vrms Vrms dBV (Vrms) % dB dBV (Vrms) V =13V, Rsense=4k SW=2V RS=0, A-weighting, VIN=2Vrms + 0.7 0.9 - q CONTROL CHARACTERISTICS (Ta=25C, V =5V unless otherwise specified) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Low Level Input Voltage High Level Input Voltage VIL VIH - 2.0 - 0.5 - V V sCONTROL TERMINAL EXPLANATION SW(7pin) MODE Limiter ON Limiter OFF STATUS L H Limiter is active. Limiter is not active. NOTE -2- NJM2761 sTERMINAL DESCRIPTION No. SYMBOL FUNCTION EQUIVALENT CIRCUIT VOLTAGE 1 V+ Power Supply Terminal - 2 9 OUTa OUTb Ach Output Terminal Bch Output Terminal OUTa OUTb 100 V+/2 1k 3 8 INa INb Ach Input Terminal Bch Input Terminal INa INb 96k V+/2 48k 4 INT Smoothing Capacitor Connection Terminal INT 400 0.7V 300k 5 VREFIN Reference Voltage Stabilizing Capacitor Connection Terminal VREFIN 300k V+/2 300k -3- NJM2761 sTERMINAL DESCRIPTION No. SYMBOL FUNCTION EQUIVALENT CIRCUIT VOLTAGE 6 SENSE Resister Connection Terminal for Limit Level Setting 0V SW 7 SW Limiter ON/OFF Switch 150k - 270k 10 GND Ground Terminal - -4- NJM2761 sAPPLICATION CIRCUIT V+ 0.22F GND 10 1F 2 OUTa OUTb 9 0.22F 1 V+ 1F 0.22F 3 INa INb 8 0.022F 4 0.22F INT SW 7 5 VREF SENSE 6 RSENSE RSENSE = 4000 / VLIMIT [] -5- NJM2761 sTYPICAL CHARACTERISTICS V+ - Icc 2 V+=5V,No-Signal,Limiter=ON,Rsense=20k Icc-Temperature 2 V+=5V,No-Signal,Limiter=ON,Rsense=20k 1.5 Icc[mA] Icc[mA] 1.5 1 1 0.5 0.5 0 0 5 Vcc[V] 10 15 0 -20 0 20 40 o 60 80 Temperature [C ] Limit Response-Rsense V+=5V,f=1kHz,Limiter=ON Rsense=4k Limit Response-V + Vin=0dBV,Limiter=ON,Rsense=20k 1 Rsense=8k 1 V+=5.0V Output [Vrms] Rsense=20k 0.1 Output[Vrms] V+=2.7V 0.1 V+=13.0V 0.01 0.01 0.1 Input[Vrms] 1 0.01 0.01 0.1 Input[Vrms] 1 Limit Response-Temperature V+=5V,Vin=0dBV,Limiter=ON,Rsense=20k Vom 10 f=1kHz,Limiter=OFF,Rsense=20k 1 V =2.7V V =5.0V + + Output [Vrms] -20C o 75C o 1 THD[%] + V =13.0V 0.1 25C o 0.1 0.01 0.01 0.1 Input[Vrms] 1 0.01 0.0001 0.001 0.01 0.1 1 Input[Vrms] -6- NJM2761 sTYPICAL CHARACTERISTICS THD-Vcc 10 f=1kHz,Limiter=ON,Rsense=20k THD-Temperature 10 V+=5V,Vin=0dBV,Limiter=ON,Rsense=20k V =2.7V V =5.0V + + 1 THD[%] + 1 THD[%] V =13.0V -20C o 0.1 0.1 75C o 25C o 0.01 0.001 0.01 0.1 Input[Vrms] 1 0.01 0.001 0.01 0.1 Input[Vrms] 1 -60 -65 -70 Cross Talk[dB] V+=5V,Vin=0dBV,Limiter=ON,Rsense=20k Cross Talk Ripple Rejection 0 V+=5V,Vripple=100mVrms,Limiter=ON -20 Ripple[dBV] -75 -80 -85 -90 -95 -100 100 -20C o 25C o -40 25C o o 75C o -60 -20C -80 75C o 1000 Frequency[Hz] 10000 -100 100 1000 Frequency[Hz] 10000 [CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. -7- |
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