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| BH3541F / BH3544F Optical disc ICs Headphone amplifier for CD-ROMs BH3541F / BH3544F The BH3541F and BH3544F are digital-source dual headphone amplifiers. The BH3541F has a fixed gain of 0dB and the BH3544F has a fixed gain of 6dB so that external gain setting is unnecessary. Both the BH3541F and BH3544F have internal mute functions so that prevention of the popping sound when power is turned on and off is greatly simplified. Also, these ICs are equipped with thermal shutdown circuits to prevent damage from short circuits. Product name BH3541F BH3544F Fixed gain 0dB 6dB !Applications Devices that use the headphone output from CD-ROMs, CDs, MDs, personal computers, notebook computers, camcorders, etc. !Features 1) Internal mute function to prevent popping sounds when the power is turned on and off. 2) Built-in thermal shutdown circuit (150C) to prevent damage to the IC if a short circuit occurs. 3) Compact SOP8 pin package. !Absolute maximum ratings (Ta = 25C) Parameter Applied voltage Power dissipation Operating temperature Storage temperature Symbol VMax Pd Topr Tstg Limits 7.0 450 -25 ~ +75 -55 ~ +125 Unit V mW C C Reduced by 4.5mW for each increase in Ta of 1C over 25C. !Recommended operating conditions (Ta = 25C) Parameter Power supply voltage Symbol VCC Min. 2.8 Typ. - Max. 6.5 Unit V BH3541F / BH3544F Optical disc ICs !Block diagram VCC 8 OUT2 7 BIAS 6 IN2 5 BIAS 0dB (6dB) TSD 180k (90k) + + 180k (90k) 0dB (6dB) MUTE 1 OUT1 2 MUTE 3 IN1 4 GND ( ) The values in parenthesis are for the BH3544F. BH3541F / BH3544F Optical disc ICs !Pin descriptions Pin No. Pin name I/O Pin voltage Internal equivalent circuit VCC Function Output pin 1 OUT1 O 2.1V 1 7 OUT2 O 2.1V (VCC=5V) 7 10k VCC Mute control pin (set to low for prevention of popping noise when power is turned on and off). Operating : High Muting : Low (open) 0.1V 2 MUTE I (When open) 190k 2 VCC Input pin 3 IN1 I 2.1V 3 5 IN2 I 2.1V (VCC=5V) 5 180k BIAS VCC 2.1V 6 BIAS I/O (VCC=5V) 6 60k 60k BIAS Bias pin (the external 47F capacitor also serves as the anti-pop time constant, therefore make the proper considerations be changing it). 4 GND I - 8 VCC I - BH3541F / BH3544F Optical disc ICs !Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 5.0V, RL = 32, BH3541F : VIN = 0dBV, BH3544F : VIN = -6dBV, and f = 1kHz) Parameter Quiescent current Mute pin control voltage Symbol IQ VTM BH3541F GVC GVC THD PO1 PO2 VNO CS ATT RR Min. 4 0.3 -2 4 -0.5 - 25 50 - 82 70 50 Typ. 7 0.7 0 6 0 0.02 31 62 -93 90 80 57 Max. 10 1.6 2 8 0.5 0.1 - - -85 - - - Unit mA V dB dB dB % mW mW dBV dB dB dB Conditions VIN=0Vrms - - - - BW=20~20kHz RL=32, THD < 0.1% RL=16, THD < 0.1% BW=20~20kHz, Rg=0 Rg=0 Rg=0 fRR=100Hz, VRR=-20dBV Voltage gain BH3544F Voltage gain difference between channels Total harmonic distortion Rated output 1 Rated output 2 Output noise voltage Channel separation Mute attenuation Ripple rejection !Measurement circuit 32 SW7 1 SW5 330 + 1 1 2 16 2 V V7AC + 47 VIN2 + CVCC SW8B VCC 8 OUT2 7 BIAS 6 IN2 5 A IQ 10 BIAS 1 2 0dB (6dB) TSD VRR 0dB (6dB) 180k (90k) SW8A + + 180k (90k) VCC MUTE 1 32 SW1 1 2 330 + OUT1 2 MUTE 3 IN1 4 GND 1 SW3 1 2 16 V1AC V VTM VIN1 ( ) The values in parenthesis are for the BH3544F. Fig.1 BH3541F / BH3544F Optical disc ICs !Measurement conditions Signal IQ VTM GVC GVC THD PO1 SW table SW1 SW3 SW5 SW7 SW8A SW8B 1 - 1 - 1 1 1 - 2 - 2 2 1 - 2 - 2 2 1 - 1 - 1 1 2 - 2 - 2 2 OFF - ON - ON ON Monitor IQ - V1AC, V2AC - V1AC, V2AC V1AC, V2AC Conditions - - f=1kHz, VIN1/2=0dBV (VIN1/2=-6dBV), VTM=1.6V GVC1-GVC2 fin=1kHz, VIN1/2=0dBV (VIN1/2=-6dBV), VTM=1.6V fin=1kHz, VIN1/2=0dBV (VIN1/2=-6dBV), VTM=1.6V fin=1kHz, VIN1/2=0dBV (VIN1/2=-6dBV), VTM=1.6V - PO2 VNO 2 1 1 1 2 1 1 2 2 1 2 1 2 1 1 1 2 2 2 2 ON ON ON ON V1AC, V2AC V1AC, V2AC CS fin=1kHz, VIN2=0dBV (VIN2=-6dBV), V1AC, V2AC VTM=1.6V V1AC, V2AC fin=1kHz, VIN1=0dBV (VIN1=-6dBV), VTM=1.6V V1AC, V2AC fin=1kHz, VIN1/2=0dBV (VIN1/2=-6dBV), VTM=0.3VB ATT RR ( 1 1 2 1 2 1 1 1 2 1 ON ON V1AC, V2AC VRR=-20dBV, fRR=100Hz ) The values in parenthesis are for the BH3544F. !Circuit operation Rising edge timing Rise period A Play period A Rise period B VCC C OUT VMUTE A : MUTE period (use with MUTE = Low to prevent the popping noise when the power is turned on and off). B : MUTE release time (used to prevent the popping noise at the release of MUTE with the external C2 and R2, and therefore possesses a time constant, so be careful of the timing). C : MUTE start time (also possesses a time constant like the MUTE release time). BH3541F / BH3544F Optical disc ICs !Application example 330 + 1 VCC + VCC 8 OUT2 7 + BIAS 6 47 IN2 5 VIN2 BIAS 0dB (6dB) TSD 180k (90k) + + 180k (90k) 0dB (6dB) MUTE 330 + VMUTE H : Active L : Mute 1 OUT1 2 MUTE 3 IN1 4 GND 1 100k VIN1 1 ( ) The values in parenthesis are for the BH3544F. Fig.2 !Explanation of external components (1) Input coupling capacitor (C3 and C5) Determined by the low-band cut-off frequency. Since the input impedance for this IC is 180k, it can be determined by the formula below, but take into consideration the fluctuations, ambient temperature, etc. (a multi-layered ceramic capacitor is recommended). C3 (C5) = 1 / ( 2 x 180k x f ) (2) BIAS capacitor (C6) 47F when VCC = 5V, and 33F when VCC = 3V. If the capacitance is lowered too much, the electrical characteristics will be adversely affected and popping noise may occur. Therefore, take the sufficient considerations before changing these values. (3) MUTE pin for anti-pop measures (R2 and C2) Possesses an impedance of 190k with respect to GND, so if R2 is increased too much, the MUTE mode may become unable to be released. (4) Output coupling capacitor (C1 and C7) Determined by the low-band cutoff frequency. As the output load resistance value RL (assuming that for output protection or current limiting, a resistor RX will be inserted), it can be determined by the formula below. C1 (C7) = 1 / ( 2 x ( RL + RX ) x f ) (5) Input gain adjustment resistor (R3 and R4) (for BH3544F only) Input gain adjustment can by performed by external resistors R3 and R4. The desired gain can be set by the formula given below. GVC = 6 + 20log ( 90k / ( 90k + R3 ) ) [dB] BH3541F / BH3544F Optical disc ICs !Operation notes The application example is recommended by ROHM, but before use in your application, be sure to carefully confirm electrical characteristics. Also, for use with different circuit constants for the external circuits, be sure to leave a sufficient margin for fluctuations in characteristics in the external components and ROHM ICs in not only the static characteristics, but also the transient characteristics as well. !Electrical characteristic curves 10 QUIESCENT CURRENT : IQ (mA) 8 7 6 5 4 3 2 1 0 0 2 4 6 8 10 MUTE : ON MUTE : OFF 4 4 OUTPUT DC VOLTAGE : VO (V) OUTPUT VOLTAGE : VOUT (dBV) Ta=25C 9 RL=32 5 Ta=25C RL=32 BIAS DC VOLTAGE : VBIAS (V) 5 Ta=25C 0 RL=32 VCC=5V -10 VIN=0dBV f=1kHz -20 -30 -40 -50 -60 -70 -80 -90 0 0.4 0.8 1.2 1.6 2 10 3 3 2 2 1 1 0 0 2 4 6 8 0 10 SUPPLY VOLTAGE : VCC (V) SUPPLY VOLTAGE : VCC (V) MUTE CONTROL VOLTAGE : VTM (V) Fig.3 Quiescent current vs. power supply voltage Fig.4 Pin DC current vs. power supply voltage Fig.5 Output voltage vs. MUTE control voltage TOTAL HARMONIC DISTORTION : THD (%) 6 VOLTAGE GAIN : GVC (dB) 4 2 0 -2 -4 -6 -8 -10 -12 10 100 1k BH3544F Ta=25C RL=32 VCC=5V TOTAL HARMONIC DISTORTION : THD (%) 8 10 10 Ta=25C RL=32 VCC=3V 1 f=10kHZ 0.1 f=1kHZ 0.01 f=100HZ 0.001 -40 1 f=10kHZ 0.1 BH3541F f=1kHZ Ta=25C RL=32 VIN=0dBV VCC=5V 10k 100k 0.01 f=100HZ -30 -20 -10 0 10 0.001 -40 -30 -20 -10 0 10 FREQUENCY : F (HZ) OUTPUT VOLTAGE : VO (dBV) OUTPUT VOLTAGE : VO (dBV) Fig.6 Voltage gain vs. frequency Fig.7 Total harmonic distortion vs. output voltage ( ) Fig.8 Total harmonic distortion vs. output voltage ( ) BH3541F / BH3544F Optical disc ICs TOTAL HARMONIC DISTORTION : THD (%) CHANNEL SEPARATION : CS (dB) Ta=25C RL=16 VCC=5V TOTAL HARMONIC DISTORTION : THD (%) 10 10 Ta=25C RL=16 VCC=3V 1 f=10kHZ 120 Ta=25C RL=32 Rg=0 VCC=5V 100 80 60 40 20 0 10 1 f=10kHZ f=1kHZ 0.1 0.1 f=1kHZ f=100HZ 0.01 0.01 f=100HZ 0.001 -40 -30 -20 -10 0 10 0.001 -40 -30 -20 -10 0 10 100 1k 10k 100k OUTPUT VOLTAGE : VO (dBV) OUTPUT VOLTAGE : VO (dBV) FREQUENCY : f (HZ) Fig.9 Total harmonic distortion vs. output voltage ( ) Fig.10 Total harmonic distortion vs. output voltage ( ) Fig.11 Channel separation vs. frequency 100 90 MUTE ATTENUTION : ATT (dB) 80 RIPPLE REJECTION : RR (dB) 80 70 60 50 40 30 20 10 0 10 100 1k RIPPLE REJECTION : RR (dB) C-BIAS:47F C-BIAS:33F C-BIAS:100F 70 60 50 40 30 20 10 0 10 100 1k Ta=25C VRR=-20dBV RL=32 Rg=0 VCC=5V 100 90 80 70 60 50 40 30 20 10 Ta=25C VRR=-20dBV RL=32 Rg=0 fRR=100HZ VTM=OPEN RL=32 VIN=0dBV VCC=5V 10k 100k FREQUENCY : f (HZ) 10k 100k 0 0 2 4 6 8 10 FREQUENCY : f (HZ) SUPPLY VOLTAGE : VCC (V) Fig.12 MUTE attenuation vs. frequency Fig.13 Ripple rejection vs. frequency Fig.14 Ripple rejection vs. power supply voltage !External dimensions (Units : mm) 5.00.2 8 5 6.20.3 4.40.2 1 4 1.50.1 0.11 1.27 0.40.1 0.3Min. 0.15 SOP8 0.150.1 |
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