IC for Headphone Stereos LAG673 MITSUMI IC for Headphone Stereos Monolithic IC LAG673 Outline This IC was developed for use in 3 V headphone stereos. It incorporates dual preamp, power amp, electronic volume and motor control circuits; because it requires extremely few external components, it can be used in a simple circuit configuration. Features 1. Broad operating voltage range of 2.0 to 5.0 V 2. Few external components required 3. Well-balanced electronic VR, A-curve attenuation characteristic obtained with B-curve VR 4. Internal motor control circuit, with noise from motor driving unit suppressed 5. Fast forward possible using the forced-on pin Package SOP-28B (LAG673F) SDIP-30A (LAG673D) Absolute Maximum Ratings Item Symbol Ratings Units Operating temperature TOPR -20~+65 °C Storage temperature TSTG -40~+125 °C Power supply current VCC -0.3~+7.5 V Operating voltage Vop 2.0~5.0 V Power consumption Pd 450 (SOP-28B) 750 (SDIP-30A) mW IC for Headphone Stereos LAG673 MITSUMI Electrical Characteristics (Except where noted otherwise, Ta=25°C) Item Consumption current (excluding motor speed controller unit) Preamp unit (Ta=25°C) Open-circuit gain Closed-circuit gain Maximum output voltage Total harmonic distortion ratio Output noise voltage Input impedance Crosstalk between channels Output voltage with preamp off Output resistance with preamp off Input resistance with preamp off Attenuator unit (Ta=25°C) Maximum input voltage Maximum attenuation Attenuation error Input impedance Control pin input resistance Power amp unit (Ta=25°C) Voltage gain Voltage gain difference between channels Maximum output power I Maximum output power II Total harmonic distortion ratio Crosstalk between channels Output noise voltage Ripple rejection Noise of preamp + power amp Motor control unit (Ta=25°C) Consumption current Startup current Reference voltage Reference voltage fluctuation I Reference voltage fluctuation II Reference voltage fluctuation III Current coefficient Symbol Measurement conditions ICC VIN=0V, IM=0mA Gvo Gvc Vom THD Vno Zin C·T Vooff Rooff Rioff Vi max. Va max. Vaerr Zia Zicot Gv Gv Pom Pom THD C·T Vn RR Vnto IMC IMS Vref Vref1 Vref2 Vref3 K 18 Vo=-10dBm, RL=∞ Vo=-10dBm 40 THD=10% 0.30 VOUT=400mVrms VIN=0V, Rg=2.2kΩ, BPF=30Hz~20kHz VOUT=-10dBm 18 Rg=2.2kΩ, VOUT=-10dBm 30 VIN=100mVrms 72 42 0.45 0.05 150 22 25 15 POUT=5mW Vcont=max. THD=10%, RL=32Ω THD=10%, RL=16Ω POUT=5mW POUT=5mW Rg=2.2kΩ, Vcont=min. 100Hz, 100mVp-p VIN=0V, Rg=2.2kΩ, Vcont=max. Between RML-ADJ pins VCC between 2.0 and 5.0V IM between 25 and 250 mA Ta between -10 and 50°C VRL K=------------R1 IM VCC between 2.0 and 6.5 V IM between 25 and 250 mA Ta between -10 and 60°C TM=200mA 26 20 30 45 42 500 0.72 * 32 mA 10 10 dB dB Vrms 0.5 % 300 µVrms kΩ dB -50 dB kΩ kΩ 0 20 100 Vrms dB dB kΩ kΩ 44 0.2 66 Vcont=min. Vcont=max. Current coefficient fluctuation I K1 Current coefficient fluctuation II K2 Current coefficient fluctuation III K3 Output voltage on forced on VCEsa Input resistance on forced on Rion Leakage current on forced off IML Input resistance on forced off Ricon Conditions: VCC=3.0 V, IM = 100 mA Motor: M25E-7 (Mitsumi model) Voltage drift between pins 17 and 13 * Min. Typ. Max. Units 28 0 28 0.2 55 0.25 50 6 dB dB mW mW 2.0 % dB 1.0 mVrms dB 9 mVrms 3.0 5.0 0.80 0.05 0.01 0.01 38 0.5 0.05 0.02 5.6 33 30 3 mA mA 0.87 V %/V %/mA %/°C 43 %/V %/mA %/°C 0.6 V kΩ 200 µA kΩ MITSUMI IC for Headphone Stereos LAG673 Block Diagram 1: The motor speed potentiometer is 1.5 kΩ (assuming the motor used is Mitsumi M25E-7; if the optimal adjustment range is not obtained using a different motor, add a fixed resistance). 2: RML = motor load correction resistance 3: Connecting the preamp off pin to +VCC turns the preamp circuits off. 4: Connecting the motor forced-on pin to +VCC turns the motor on (no control). 5: in circles are pin numbers for a DIP-30P package; numbers in parentheses ( ) are for an SOP-28B package. 6: In the DIP-30P package, pins 15 and 16 are NC. 7: Ca is a 100,000 pF capacitor used to prevent oscillation of the 1/2 VCC amp circuit. IC for Headphone Stereos LAG673 MITSUMI Characteristics Output voltage attenuation (dB) Preamp Total harmonic distortion ratio (%) THD-VOUT VCC=1.8V VCC=2.0V VCC=3.0V 10.0 1.0 0.1 Attenuator VATT-VCONT VCC=3.0V 0 -20 -40 -60 -80 0/6 1/6 (min.) 2/6 3/6 4/6 5/6 6/6 (max.) Voltage controllability (B curve mechanical volume knob) 0.01 -30 -20 -10 0 ICC-VCC 20 IOC (RL=16Ω) 70 60 50 40 30 20 10 15 RL=16Ω RL=32Ω 10 5 0 1.0 2.0 3.0 4.0 5.0 Power supply voltage (V) Power amp THD-POUT 100 Total harmonic distortion ratio (%) Power supply output (THD=10%) POUT max. (mW) POUT. No-load consumption current (mA) Output voltage (dBm) VCC=1.8V VCC=2.0V VCC=3.0V 10 1 0.1 0.1 1 Power amp -20 FR=100Hz VR=100mVrms RL=16Ω -30 -40 -50 2.0 3.0 4.0 5.0 Power supply voltage (dB) 10 Gain (dB) VCC=3.0V When VR=max. TOTAL GAIN POWER AMP GAIN 100 1k 10k Frequency (Hz) -10 -20 -30 VCC=3.0V -40 -50 100 1k 10k 100k Frequency (Hz) Voltage gain vs. Frequency 100 80 70 60 50 40 30 20 10 Crosstalk frequency Crosstalk (dB) Ripple rejection (V) PREAMP OFF VR=max. -10 1.0 100 Power amp Ripple rejection rate-VCC 0 10 Power supply output (mW) 100k