NJM2790 AUDIO LINE AMPLIFIER with MUTE FUNCTION ■ GENERAL DESCRIPTION ■ PACKAGE OUTLINE The NJM2790 is a low voltage audio line amplifier designed for audio items. Internal closed loop voltage gain is suitable for amplifier of small line signal in digital audio items. It includes mute circuit which realizes very low turn-noise at power on/off. The NJM2790 is 6.5dB closed loop voltage gain, another version of 3.5dB is the NJM2174. NJM2790V It is suitable for digital audio items with line out. ■ FEARTURES ● Operating Voltage ● Operating Current ● Maximum Output Voltage ● Closed Loop Voltage Gain 4.5 to 5.5V 2.5mA typ. at V+=5V 4dBV typ. at THD=0.1% 3.5dB typ. at f=1kHz 2.5dB typ. at f=100kHz ● Mute Function -85dB typ. ● Supply Voltage Rejection Ratio 60dB typ. ● Bipolar Technology ● Package Outline SSOP14 ■ PIN CONFIGURATION 1 14 2 13 3 12 4 11 5 10 6 9 7 8 PIN FUNCTION 1. GND 8. BIAS 9. NC 2. NC 10. NC 3. OUT-R 11. IN-L 4. MUTE 1 12. OUT-L 5. MUTE 2 13. NC 6. MUTE C 14. V+ 7. IN-R NJM2790V ■ BLOCK DIAGRAM 14 V+ GND 1 NC 2 13 NC OUT-R 3 12 OUT-L MUTE1 4 11 IN-L MUTE2 5 MUTE 10 NC MUTEC 6 9 NC IN-R 7 BIAS 8 BIAS -1- NJM2790 ■ ABSOLUTE MAXIMUM RATINGS RARAMETER SYMBOL Supply Voltage V+ Power Dissipation PD Operating Temperature Range Topr Storage Temperature Range Tstg RATINGS 7 300 -20 to +75 -40 to +125 (V+=5V, VIN=-3dBV, RL=47kΩ, f=1kHz, Ta=25°C) ■ ELECTRICAL CHARACTERISTICS PARAMETER (Ta=25°C) UNIT V mW °C °C SYMBOL TEST CONDITION + Operating Voltage Range Operating Current V ICC Reference Voltage Closed Loop Voltage Gain1 Closed Loop Voltage Gain2 Channel Gain Balance VREF GV1 GV2 ∆GV Maximum Output Voltage VOM Total Harmonic Distortion THD Output Noise Voltage VNO Rg=0Ω, A-Weighted Mute Level Channel Separation Supply Voltage Rejection Ratio High Level Input Voltage Low Level Input Voltage MUTE CS VO/VIN SVR VRP=-20dBV, Rg=0Ω No signal No signal f=100kHz THD=0.1% ■ CONTROL TERMNAL MUTE2(5pin) L L H H L H L H -2- TYP. MAX. UNIT 4.5 - 5.0 2.5 5.5 4.5 V mA 2.0 2.3 5.5 6.5 -4.0 -0.5 -0.5 0 3 4 (1.41) (1.6) 0.005 -92 (25) -85 70 90 VIH VIL MUTE1(4pin) MIN. STATUS IC output no signal. IC output no signal. IC set up 6.5dB typ. voltage gain. IC output no signal. 2.6 7.5 -5.0 0.5 V dB dB dB dBV (Vrms) 0.01 % dBV -85 (56) (µVrms) -70 dB dB 35 50 - dB 2.0 0 - V+ 0.3 V V NJM2790 ■ TYPCAL APPLICATION OUT-L IN-L V+ NC 14 13 NC NC 10 9 11 12 8 BIAS 135kΩ 135kΩ 40pF 65kΩ 20kΩ 65kΩ 20kΩ 40pF 135kΩ 135kΩ MUTE 1 2 4 3 5 6 7 NC H OUT-R L H L IN-R [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. -3-