MM1336

MITSUMI IC for Headphone Stereos (with volume-limiting circuit) MM1336 IC for Headphone Stereos (with volume-limiting circuit) Monolithic IC MM1336 Outline This IC was developed for use in 3V headphone stereos. In addition to the basic functions required by headphone stereos, it incorporates a circuit for limiting volume. In some parts of Europe hearing impairment caused by the high volumes of headphone stereos has become a problem, and there has been strong demand for functions for limiting loud volumes in the sets themselves. This trend is expected to gain momentum in the U.S. as well. This IC uses an internal ALC circuit to suppress headphone stereo output, avoiding the above problem. Features 1. Configuration: Pre-and power amps, ALC circuit, motor control 2. Internal tape selector: A selector switch allows the user to select between normal and metal tapes. 3. Internal OCL circuit: There is no need for a capacitor for high-volume output, so sets can be kept thin. 4. With preamp off pin while connected to radio 5. Designed for low shock noise Reduced noise occuring when the power supply is turned on and off Package SOP-28B (MM1336CF, MM1336DF) Pin Assignment 1 2 3 4 5 6 7 8 9 10 11 12 13 14 COM1 PIN1 PNF1 PBU1 POUT1 IN1 RECT AVNF OUT1 COM2 GND1 GND2 PCOUT PHASE 15 16 17 18 19 20 21 22 23 24 25 26 27 28 VS C VCC2 OUT2 VCC1 RF Pre OFF N/M IN2 POUT2 PBU2 PNF2 PIN2 GND3 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 SOP-28B Absolute Maximum Ratings Item Operating temperature Storage temperature Power supply current Power consumption Symbol TOPR TSTG VCC Pd Ratings -20~+65 -40~+125 -0.3~+7.5 700 Units °C °C V mW MITSUMI IC for Headphone Stereos (with volume-limiting circuit) MM1336 Recommended Operating Conditions Item Operating temperature Operating voltage Symbol TOPR VOPR Ratings -20~65 2.0~5.0 Units °C V Electrical Characteristics Item Consumption current Preamp unit Open-circuit gain Normal Closed-circuit gain I Metal Normal Closed-circuit gain II Metal Maximum output voltage Total harmonic distortion ratio Normal Output noise voltage Metal Crosstalk between channels Ripple rejection rate Output voltage with preamp off ALC (off) + power amp Voltage gain (Except where noted otherwise, Vcc=3V, Ta=25°C, f=1kHz, RL1=10kΩ, RL2=16Ω) Symbol ICC Gvo Gvc Gvc Vom THD Vno C·T RR Vooff Gv GV 2CH Pom THD C·T Vn RR Ri VOA VINA WALC THD Vnto Vo=-10dBm, f=1kHz Vo=-10dBm, f=5kHz THD=10% VOUT=-10dBm 31 29.5 28 23 0.30 Measurement conditions VIN=0V, when motor is off Min. Typ. Max. Units 6 12 20 mA 72 33.5 32 30.5 25.5 0.45 0.05 75 45 70 55 -80 26 0 50 0.5 45 85 45 24 -30 -56 40 0.5 1.5 1.5 6 dB 36 34.5 33 28 dB dB Vrms % 30 Rg=2.2k, BPF (400~30kHz) 20 Rg=2.2kΩ, VOUT=-10dBm 50 VCC=3V, VR=-20dBm, fR=100Hz, Rg=2.2kΩ 45 VIN=100mVrms, Pre off POUT=5mW 24 -2 THD=10% RL=16Ω POUT=5mW POUT=5mW Rg=0Ω, BPF (400~30kHz) VCC=3V, VR=-20dBm, fR=100Hz, Rg=0Ω 30 35 35 19 -34 0.5 150 µVrms 100 dB dB -60 dBm 28 2 dB dB Voltage gain difference between channels Maximum output current Total harmonic distortion ratio Crosstalk between channels Output noise voltage Ripple rejection rate Input resistance ALC (on) + power amp Power amp output voltage ALC initiation input voltage ALC width ALC total harmonic distortion Noise of preamp+power amp+ALC mW 1.5 % dB 200 µVrms dB 29 kΩ -26 dBm dBm dB % mVrms VIN=-40dBm Input width for output from start of up to +4dB VIN=-40dBm Rg=2.2kΩ (preamp) 30 MITSUMI IC for Headphone Stereos (with volume-limiting circuit) MM1336 Item Motor control unit Consumption current Startup current Reference voltage Reference voltage fluctuation I Symbol Id IMS VS VS1 Measurement conditions Min. Typ. Max. Units Reference voltage fluctuation II VS2 Reference voltage fluctuation III Output saturation voltage Bridge ratio Bridge ratio fluctuation I VS3 VoSAT K K1 Bridge ratio fluctuation II K2 Bridge ratio fluctuation III K3 A2 measurement IM=0mA 1.5 3.5 mA At Rv=1.5Ω 500 mA At SW1=OFF, IM=100mA 0.09 0.10 0.11 V VS fluctuation rate for VCC between 1.8 and 3.5V with VCC=3.0 0.1 0.5 %/V V as reference, IM=100mA VS fluctuation rate for IM between 25 and 200 mA with 0.005 0.05 %/mA IM=100 mA as reference VS fluctuation rate for Ta between -10 and 50°C with 0.01 %/°C °C as reference Ta=25 IM=200mA, V8 measurement, SW2=on 0.2 0.3 V V7/ V6 measurement 9 10 11 K fluctuation rate for VCC between 1.8 and 3.5V with 0.1 0.2 %/V VCC=3V as reference K fluctuation rate for IM between 25 and 250mA with 0.05 0.2 %/mA IM=100mA as reference K fluctuation rate for Ta between -10 and 60°C with 0.01 %/°C Ta=25°C as reference Block Diagram