NJM2761 Audio Limiter ■ 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. ■ PACKAGE OUTLINE NJM2761RB2 ■ FEATURES ● Wide Operating Voltage ● Variable Limit Level by external resistor ● Low Output Noise ● Bipolar Technology ● Package Outline +2.7V to +13.0V 0.2 to1V -90dBV max. TVSP10 ■ 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 ■ BLOCK DIAGRAM Vcc Vref INa OUTa INb OUTb SW INT SENSE -1- NJM2761 ■ABSOLUTE MAXIMUM RATING (Ta=25°C) PARAMETER SYMBOL + RATINGS UNIT Supply Voltage V 14 V Power Dissipation PD 320 mW Operating Temperature Range Topr -20 to +75 °C Storage Temperature Range Tstg -40 to +125 °C ■ELECTRICAL CHARACTERISTICS + ● POWER SUPPLY (Ta=25°C, V =5V unless otherwise specified) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT - 2.7 5.0 13.0 V + Operating Voltage V Operating Current ICC No Signal - 1.5 2.0 mA Reference Voltage Vref No Signal 2.2 2.5 2.7 V ● AC CHARACTERISTICS + (Ta=25°C, V =5V, VIN=1Vrms/f=1kHz, Rsense=20kΩ, BW=400-30kHz unless otherwise specified) PARAMETER Limit Level 1 SYMBOL TEST CONDITION GLIM1 + MIN. TYP. MAX. UNIT 150 200 250 mVrms 1.0 1.3 Vrms Limit Level 2 GLIM2 V =13V, Rsense=4kΩ 0.7 Limit Off GOFF SW=2V 0.9 1.0 1.1 Vrms VNO RS=0Ω, A-weighting, VIN=2Vrms - -100 (10) -90 (31.6) dBV (µVrms) THD+N - - 1 % Cross Talk CT - - -70 dB Ripple Rejection RR - - -70 (316) dBV (µVrms) Output Noise Total Harmonic Distortion Vripple=100mVrms, f=1kHz + ● CONTROL CHARACTERISTICS (Ta=25°C, V =5V unless otherwise specified) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Low Level Input Voltage VIL - - - 0.5 V High Level Input Voltage VIH - 2.0 - - V ■CONTROL TERMINAL EXPLANATION SW(7pin) MODE STATUS NOTE Limiter ON L Limiter is active. Limiter OFF H Limiter is not active. -2- NJM2761 ■TERMINAL DESCRIPTION No. SYMBOL FUNCTION 1 V+ Power Supply Terminal 2 9 OUTa OUTb Ach Output Terminal Bch Output Terminal EQUIVALENT CIRCUIT VOLTAGE - OUTa OUTb 100 V+/2 1k 3 8 INa INb INa INb Ach Input Terminal Bch Input Terminal V+/2 96k 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 ■TERMINAL DESCRIPTION No. SYMBOL FUNCTION 6 SENSE Resister Connection Terminal for Limit Level Setting EQUIVALENT CIRCUIT VOLTAGE 0V SW 7 SW - Limiter ON/OFF Switch 150k 270k 10 -4- GND Ground Terminal - NJM2761 ■APPLICATION CIRCUIT V+ 0.22µF 1µF 0.22µF 1 V+ 10 OUTb 9 8 1µF 2 OUTa 3 INa INb 4 INT SW 7 5 VREF SENSE 6 0.022µF 0.22µF GND 0.22µF RSENSE RSENSE = 4000 / VLIMIT [Ω] -5- NJM2761 ■TYPICAL CHARACTERISTICS V+ - Icc Icc-Temperature V+=5V,No-Signal,Limiter=ON,Rsense=20k Ω 2 2 1.5 Icc[mA] Icc[mA] 1.5 1 0.5 0 V+=5V,No-Signal,Limiter=ON,Rsense=20k Ω 1 0.5 0 5 10 0 15 -20 0 20 40 60 80 o Vcc[V] Temperature [C ] Limit Response-V + Limit Response-Rsense Vin=0dBV,Limiter=ON,Rsense=20k Ω V+=5V,f=1kHz,Limiter=ON Rsense=4k 1 1 V+=5.0V Rsense=20k 0.1 0.01 0.01 0.1 Output[Vrms] Output [Vrms] Rsense=8k V+=2.7V 0.1 V+=13.0V 0.01 0.01 1 0.1 Input[Vrms] 1 Input[Vrms] Limit Response-Temperature Vom V+=5V,Vin=0dBV,Limiter=ON,Rsense=20k Ω 10 f=1kHz,Limiter=OFF,Rsense=20k Ω 1 + V =2.7V + 0.1 o 75C o V =5.0V 1 THD[%] Output [Vrms] -20C 25C o + V =13.0V 0.1 0.01 0.01 0.1 Input[Vrms] -6- 1 0.01 0.0001 0.001 0.01 0.1 Input[Vrms] 1 NJM2761 ■TYPICAL CHARACTERISTICS THD-Vcc 10 THD-Temperature f=1kHz,Limiter=ON,Rsense=20k Ω 10 V+=5V,Vin=0dBV,Limiter=ON,Rsense=20k Ω + V =2.7V + V =5.0V 1 THD[%] THD[%] 1 + V =13.0V 0.1 -20C o 0.1 75C o 25C o 0.01 0.001 0.01 0.1 0.01 0.001 1 0.01 Input[Vrms] 1 Input[Vrms] Ripple Rejection Cross Talk -60 0.1 V+=5V,Vin=0dBV,Limiter=ON,Rsense=20k Ω 0 V+=5V,Vripple=100mVrms,Limiter=ON -65 -20 -75 Ripple[dBV] Cross Talk[dB] -70 -80 25C -85 o 75C o -90 25C o -20C -60 o -80 -95 -100 -40 -20C o 100 75C o 1000 Frequency[Hz] 10000 -100 100 1000 10000 Frequency[Hz] [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-