NJM2775A PRELIMINARY PRE&HI-POWER AMPLIFIER with ALC for PORTABLE TAPE RECORDER ■ GENERAL DESCRIPTION The NJM2775A is a pre&power amplifier with ALC designed for micro and compact cassette recorders. It contains pre-amplifier, ALC circuit, power amplifiers, and ripple filter. The pre-amplifier amplifies the signal come from magnetic head. The ALC circuit limits the input signal to optimize level in recording. The power amplifiers drive a speaker in play back and the magnetic head in recording. The ripple filter stabilizing the supply voltage to the internal pre-amplifier and an external condenser microphone. The NJM2775A improves high output power compared with the NJM2128. It is suitable for portable tape recorder, and other portable playing back and recording recorder items. ■ FEATURES ●Operating Voltage ●Operating Current ●Output Power ●Automatic Level Control (ALC) Limit Level ●Ripple Filter R.R. (Ripple Rejection) ●Bipolar Technology ●Package Outline ■ PACKAGE OUTLINE NJM2775AM + V =1.8 to 6.0V 9mA typ. + 350mW typ. at V =3V,RL=4Ω,THD=10% 200mVrms typ., at f=1kHz 47dB typ., at f=200Hz,C=47µF DMP16 ■ PIN CONFIGURATION 1 PRE+IN 2 SGND 3 POW+INA PRE-IN 16 PREOUT 15 PRE AMP POWOUTA 14 V+ 13 POWER AMPA 4 POW-INA 5 POW-INB PGND 12 POWER AMPB 6 POW+INB 7 RFOUT POWOUTB TC RIPPLE FILTER 8 RFIN 11 10 ALC ALCIN PIN FUNCTION 1.PRE +IN 2.SGND 3.POW +1NA 4.POW -INA 5.POW -INB 6.POW +INB 7.REFOUT 8.REFIN 9.ALCIN 10.TC 11.POW OUTB 12.PGND + 13. V 14.POW OUTA 15.PREOUT 16.PRE -IN 9 -1- NJM2775A PRELIMINARY ■ ABSOLUTE MAXIMUM RATINGS PARAMETER (Ta=25°C) SYMBOL + RATINGS UNIT Supply Voltage V +7.0 V PA Output Peak Current IOP 1 A PA Input Voltage Range VIN ±0.4 V Power Dissipation PD (DMP16)300 mW Operating Temperature Range Topr -20 to +75 °C Storage Temperature Range Tstg -40 to +125 °C ■ RECOMMENDED OPERATING VOLTAGE RANGE (Ta=25°C) PARAMETER MIN. TYP MAX. UNIT Operating Voltage Range 1.8 3.0 6.0 V + ■ ELECTORICAL CHARACTERISTICS PARAMETER Operating Voltage (V =3.0V,Ta=25°C) SYMBOL ICC RATINGS MIN. TYP MAX. UNIT - 9 14 mA - 140 - nA mV RL=∞ Power Amp Input Bias Current IB Out Put Offset ∆Vo - 0 50 + 400 500 - + 250 300 - - 0.2 - % 41 44 47 dB RL=8Ω Output Power PO1 (Note 1) PO2 THD=10%,f=1kHz,V =3V,RL=4Ω T.H.D. THD V =4V,RL=8Ω,Po=200mW,f=1kHz Close Loop V-Gain Av1 f=1kHz Equivalent Input VNI1 RS=10kΩ,RL=4Ω,A-Weighted - 2.0 - µVrms VNI2 RS=10kΩ,RL=4Ω,BW=22Hz to 22kHz - 2.5 - µVrms Ripple Rejection RR1 f=100Hz - 47 - dB Cut off Frequency FH RL=4Ω,Po=0.1W, Av=-3dB from f=1kHz - 80 - kHz Output Voltage Vo1 f=1kHz,THD=1% 0.1 0.2 - Vrms Voltage Gain Av f=1kHz 35 38 41 dB Output Noise Voltage VNO Rs=3.3kΩ - 0.1 0.4 mVrms ALC f=1kHz 100 200 300 mVrms Output Voltage VO2 RL=2kΩ + + + Ripple Rejection RR2 Noise Voltage THD=10%,f=1kHz,V =4V,RL=8Ω + mW Pre Amp ALC Limit Level Ripple Filter f=200Hz,C=47µF V -0.24 V -0.2 V -0.16 40 47 54 (Note 1) at on PC Board -2- V dB NJM2775A PRELIMINARY ■ TYPICAL APPLICATIONS HEAD PB MIC 1 PRE+IN 2 SGND 3 POW+INA PRE-IN 16 REC EQ. PRE AMP PREOUT 15 ON/OFF POWOUTA POW-INA 4 0.01µF 14 2.2Ω 0.01µF POWER AMPA V+ 13 4.7Ω 4Ω/8Ω 10µF 0.1µF POW-INB 5 PGND 12 SPEAKER POWER AMPB 0.01µF POW+INB 6 POWOUTB PB 11 REC 2.2Ω 7 MIC. Current TC RFOUT 47µF RIPPLE FILTER 8 RFIN 0.01µF 10 ALC ALCIN 9 47µF HEAD REC PB [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-