音频功放IC小功率前置耳机话筒放大LAG668

音频功放IC小功率前置耳机话筒放大LAG668 MITSUMI IC for Headphone Stereos bass boost LAG668 IC for Headphone Stereos bass boost Monolithic IC LAG 668Outline This IC was developed to provide bass boost functions without deviating from the basic design concept of Mitsumis LAG665 which is highly regarded for applications in headphone stereos for overseas markets in particular. Bass boost functions are widely adopted in models for overseas markets as well. However because of stringent cost constraints there has been a need for an IC which is simple and inexpensive. This IC can provide bass boost functions simply by adding three resistors and one capacitor per channel. Moreover it has the same pinout as the LAG665 so that by making selective use of set features a product lineup can be developed without changes to the printed circuit board.Features 1. Configuration: pre and power amps motor control E. VR bass boost 2. Preamp off function convenient for use in models with radios 3. Independent motor control circuit 1. Motor noise is effectively suppressed 2. With motor on/off pin motor can be stopped easily when radio is in use 3. With fast forward pin 4. Bass boost frequency characteristic can be changed simply by changing the resistance multiplier. 5. Well-balanced E. VR circuit 1. L R channels variable using a single VR 2. A-curve can be reproduced using B-curve VR 6. Few external componentsPackage SOP-28B LAG668F SDIP-30A LAG668DAbsolute Maximum Ratings Item Symbol Ratings Units Operating temperature TOPR -2065 ?C Storage temperature TSTG -40125 ?C Power supply current VCC max. -0.37.5 V Power consumption Pd DIP : 750 SOP : 450 mW Operating voltage Vop 2.05.0 VMITSUMI IC for Headphone Stereos bass boost LAG668Electrical Characteristics Except where noted otherwise Ta25?C Item Symbol Measurement conditions Min. Typ. Max. Units Consumption current ICC VIN0v IM0mA 18 25 mA Preamp unit Ta25?C Open-circuit gain Gvo VO-10dBm RLinfinite 72 dB Closed-circuit gain Gvc VO-10dBm 40 42 44 dB Maximum output voltage Vom THD10 0.45 0.6 Vrms Total harmonic distortion ratio THD VOUT400mVrms 0.05 0.5 Output noise voltage Vno VIN0 Rg2.2k BPF 3020kHz 150 300 Vrms Input impedance ZIN VOUT-10dBm 18 22 k Crosstalk between channels C.T Rg2.2k VOUT-10dBm 30 dB Output voltage with pre off Vooff VIN100mVrms -50 dB Output resistance with pre off Rooff 10 k Input resistance on pre off Rioff 10 k Attenuator unit Ta25?C Maximum input voltage Vi max. 0.2 Vrms Maximum attenuation Va max. Vcontmin. 66 dB Attenuation error Vaerr Vcontmax. 0 dB Input impedance ZIN 200 k Control pin input resistance Zicot 100 k Power amp unit Ta25?C Voltage gain Gv POUT5mW 36 38 40 dB Voltage gain difference Gv Vcontmax. 0 3 dB between channels Maximum output power I Pom1 THD10 RL32 20 28 mW Maximum output power II Pom2 THD10 RL16 30 mW Total harmonic distortion ratio THD POUT5mW 0.5 2.0 Crosstalk between channels C.T POUT5mW 20 30 dB Output noise voltage Vn Rg2.2k Vcontmax. 1.0 2.0 mVrms Ripple rejection RR VCC3V 100Hz 100mVp-p 31 37 dB Vnto VIN0 Rg2.2k Vcontmax. 1 3.0 6.0 mVrms Noise of preamp power amp B.B. Motor control unit Ta25?C Consumption current IMC 3.0 5.0 mA Startup current IMS 500 mA Reference voltage Vref Between RML-ADJ pins 0.72 0.80 0.87 V Reference voltage fluctuation I Vref1 VCC between 2.1 and 5.0 V 0.05 /V Reference voltage fluctuation II Vref2 IM between 25 and 250 mA 0.01 /mA Reference voltage fluctuation III Vref3 Ta between -10 and 50?C 0.01 /?C Current coefficient K 32 38 43 Current coefficient fluctuation I K1 VCC between 2.1 and 5.0 V 0.5 /V Current coefficient fluctuation II K2 IM between 25 and 250 mA 0.05 /mA Current coefficient fluctuation III K3 Ta between -10 and 50?C 0.02 /?C Output voltage on forced on VCEsa IM200mA 14PINVCC 0.6 V Input resistance on forced on Rion 5.6 k Leakage current on forced off IML 200 A Input resistance on forced off Ricon 33 k Conditions unless stated otherwise Amp unit: VCC3.0V f1kHz RL16 Pre OFFOPEN Motor unit: VCC3.0V IM100mA Motor unit: Mitsumi model Note 1: Bass boost circuit constants are based on application circuit diagrams. Note 2: Motor pin voltage fluctuationsMITSUMI IC for Headphone Stereos bass boost LAG668Block DiagramMITSUMI IC for Headphone Stereos bass boost LAG668Application Circuits Bass Boost Power Amp Gain GV 40 Power amp gain dB GVH 35 3dB 30 BB ON 25 3dB GVL BB Off 15 101 102 103 104 105 106 f1 f2 Frequency Hz GV : Power amp gain GVHGV20Log R1R3 dB R3 GVH : Bass boost power amp gain high level GVLGV20Log R2//R3 R1 dB R2//R3 R1 GVL : Bass boost power amp gain f1 1 Hz low level or boost off 2π R1//R3 R2C f1 f2: Cutoff frequencies 1 f2 Hz 2πR2CMITSUMI IC for Headphone Stereos bass boost LAG668Characteristics Bass boost Recommended constants Power amp gain dB 40 R133k GVH37dB 35 R24.7k GVL20dB 30 R3180k f150Hz 25 C0.1F f2340Hz 20 No R4 or C2 15 101 102 103 104 105 106 Frequency Hz Bass boost efficiency Power amp gain dB 40 R112k GVH37dB 35 R22.2k GVL20dB 30 R3180k f1130Hz 25 C0.1F f2720Hz 20 No R4 or C2 15 101 102 103 104 105 106 Frequency Hz Response for poor headphone and cassette head characteristics Power amp gain dB 40 R133k GVH37dB 35 R26.8k GVL23dB 30 R3180k f150Hz 25 C0.1F f2230Hz 20 No R4 or C2 15 101 102 103 104 105 106 Frequency Hz Bass treble boost Power amp gain dB 40 R133k GVH37dB 35 R24.7k GVL20dB 30 R3180k f150Hz 25 C0.1F f2340Hz 20 R420k GVH27dB 15 C2390pF 101 102 103 104 105 106 Frequency Hz