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| UTC BA3308 DUAL PREAMPLIFIER WITH ALC DESCRIPTION LINEAR INTEGRATED CIRCUIT The UTC BA3308 is designed to have dual preamplifier ICs with built - in ALC circuits for use in stereo amplification. The preamplifiers have high gain and low distortion. A built-in rectifier for ALC circuit implies good channel balance and large dynamic range can be constructed with addition of just an external time constant circuit. SIP-9 FEATURES * Wide operating power supply voltage range (VCC =6.0V ~ 14V) * Power-on mute circuit to avoid "pop" noise generation. * No input coupling capacitors are necessary * High gain (GVO=80dB)and low noise (VNIN=1Vrms) * Low distortion (THD=0.1%) * Good ALC channel balance with built-in ALC rectifier diode * Adjustable ALC dynamic range by external input resistor. SOP-14 *Pb-free plating product number: BA3308L BLOCK DIAGRAM SIP-9 MUTE ch1 + ch2 + ALC 1 NF1 2 3 4 5 ALC 6 Vcc 7 8 9 NF2 INPUT1 OUTPUT1 GND OUTPUT2 INPUT2 SOP-14 OUTPUT1 GND N.C. ALC VCC N.C. OUTPUT2 1 2 3 4 5 6 7 Vcc ALC + + 14 13 12 11 10 9 8 N.C. INPUT1 N.C. NF1 NF2 INPUT2 N.C. UTC UNISONIC TECHNOLOGIES CO., LTD. 1 QW-R107-015,A www.unisonic.com.tw UTC BA3308 ABSOLUTE MAXIMUM RATINGS (Ta = 25 ) PARAMETER Power Supply Voltage Power Dissipation SIP-9 SOP-14 LINEAR INTEGRATED CIRCUIT SYMBOL VCC PD Operating Temperature TOPR Storage Temperature TSTG *1 Reduced by 9.5mW for each increase in Ta of 1C over 25C. *2 Reduced by 4.5mW for each increase in Ta of 1C over 25C. (when mounted on a 70mm 70mm 1.6mm glass epoxy board) RATINGS 16 950 *1 450 *2 0 ~ +70 -65 ~ +125 UNIT V mW RECOMMENDED OPERATING CONDITIONS (Ta = 25 ) +6.0V ~ +14V ( Ta = 25~ +75 ) Power supply voltagerange 1 +4.5V ~ +14V ( Ta = 0~ +75 ) Power supply voltagerange 2 * When it is used below Ta = 0 , please use it within the range of operating power supply voltage1. ELECTRICAL CHARACTERISTICS (Ta =25 , VCC =7.0V, f =1kHz and BPF: 20Hz ~ 20kHz, unless otherwise noted.) PARAMETER Maximum output voltage Input conversion noise voltage Quiescent current Input resistance Total harmonic distortion Open loop voltage gain ALC range ALC channel balance Channel separation SYMBOL VOM VNIN IQ RIN THD GVO ALC ALC CS TEST CONDITIONS THD=1% Conversion with Rg=2.2k and NAB34dB at 1kHz VIN =0Vrms NAB34dB, VOUT =40mVrms VOUT = -10dBV RG =3.9k, VIN =-70dBV reference, THD=3% VIN = -60dBV, -30dBV VO =0dBV, NAB34dB MIN 0.6 TYP 1.2 1.0 1.5 15 70 40 60 3.3 31.5 0.1 80 70 0 75 2.5 MAX 2.0 4.5 45 0.3 UNIT Vrms Vrms mA k % dB dB dB dB UTC UNISONIC TECHNOLOGIES CO., LTD. 2 QW-R107-015,A www.unisonic.com.tw UTC BA3308 APPLICATION CIRCUIT LINEAR INTEGRATED CIRCUIT MUTE ch1 + ch2 + ALC 1 R5 18k R1 3.9K 2 3 4 R7 1M C5 10 F 5 + C7 22 F 6 + C8 330 7 8 9 R8 220 Vcc 7V R4 39 R3 39 C3 100 F + + + C1 10 F F+ C6 10 F R2 3.9k R6 18k + C2 10 F + C4 100 F INPUT1 OUTPUT1 OUTPUT2 INPUT2 R9 (R10) R11(R12) 120k 4.3k For playback,instead of R5 and R6,connect the following NAB time constant circuit between pins 1 and 3 and 7 and 9. C9 (R10) 0.027 F UTC UNISONIC TECHNOLOGIES CO., LTD. 3 QW-R107-015,A www.unisonic.com.tw UTC BA3308 TOTAL APPLICATION CIRCUIT 220 330 F + LINEAR INTEGRATED CIRCUIT + L 100 F RA 1000 9V F + 39 0.027 120k F Cc CA 33 F + 4.3k 18k 120 10 + F 10k 2.2 F 4 100 + 17 47 + F F 470 + 2.2 0.22 F F SP 3 MIC RADIO etc. 3.9k 3.9k 2 CB 8 CB 1 6 UTC BA3308 9 3 7 45 + 22 F + 10 F 10k 5 3 2 + UTC 2.2 F BA5406 11 10 6 +8 9 12 + 47 F 2.2 120 + + 47 F 33 F + 470 0.22 F F 39 100 F + 18k 120k F 4.3k L RA BIAS OSC 0.027 1M SP 3 Cc CA Notes: (1) Switches are in the playback positions. (2) Set the values of RA and CA depending on the characteristics of the playback/recording head. (3) The capacitor CB is for head resonance treble compensation during playback, and prevention of high-frequency noise. The recommended value is about 1000pF. (4) L and CC are a bias trap. UTC UNISONIC TECHNOLOGIES CO., LTD. 4 QW-R107-015,A www.unisonic.com.tw UTC BA3308 LINEAR INTEGRATED CIRCUIT Cont ch2 (ch1) + - ch1 (ch2) ch2 (ch1) 2 (8) 1 (9) R5(R6) 18k + R3(R4) 39 C3(C4) 100 F + 3 (7) 5 + + C7(C8) 22 F R7(R8) 1M R1(R1) 3.9k C1(C2) 10 F C5(C6) 10 F INPUT OUTPUT Fig.1 ch1 (ch2) + - ch2 (ch1) + - ch2 (ch1) Comp Cont 4.5VF VOUT (DC+AC) 3 (7) 5 2 (8) 3VF R7 + C7 R1 (R2) Fig.2 UTC UNISONIC TECHNOLOGIES CO., LTD. 5 QW-R107-015,A www.unisonic.com.tw UTC BA3308 + A1 - LINEAR INTEGRATED CIRCUIT 2 (8) 1 (9) R11(R12) 4.3k R9(R10) 120k 3 (7) 5 C1(C2) 10 F + R3(R4) 39 + C3(C4) 100 F C9(C10) 0.027 F + C5(C6) 10 F INPUT OUTPUT Fig.3 OPERATION NOTES The UTC BA3308 has a built-in power-on mute circuit to prevent generation of a "pop" sound when the power is applied. The generation of the "pop" sound is prevented by the DC blocking capacitors C3 and C4 connected to pins 1 and 9, and the charge time required for the ripple filter capacitor C8 that is connected to pin 6. To ensure correct operation of this circuit, use the values given in the application circuit for C3, C4, R3, R4, C8 and R8. UTC UNISONIC TECHNOLOGIES CO., LTD. 6 QW-R107-015,A www.unisonic.com.tw UTC BA3308 ELECTRICAL CHARACTERISTIC CURVES Fig.4 Quiescent current vs.power supply voltage 16 14 QUIESCENT CURRENT, IQ (mA) 12 10 8 6 4 2 0 LINEAR INTEGRATED CIRCUIT Fig.5 Quiescent current vs.ambient temperature 12 VCC=7V QUIESCENT CURRENT, IQ (mA) 10 8 6 4 2 0 4 8 10 12 2 6 14 POWER SUPPLY VOLTAGE , Vcc (V) 16 0 -50 -25 50 0 25 75 AMBIENT TEMPERATURE, Ta ( ) 100 Fig.6 Voltage gain vs. power supply voltage 100 90 VOLTAGE GAIN, Gvo (dB) 80 70 60 50 40 30 20 R5, R6=6.8k VOUT=300mVrms f=1kHz RL=10K 120 CLOSED LOOP VOLTAGE GAIN, Gvo (dB) Fig.7 Closed loop voltage gain vs. ambient temperature Vcc=7V VOUT=300mVrms f=1kHz RL=10k 100 80 60 R5, R6=18k 40 20 0 2 8 4 12 14 10 6 POWER SUPPLY VOLTAGE, Vcc (V) 16 0 -50 -25 50 75 0 25 AMBIENT TEMPERATURE, Ta ( ) 100 UTC UNISONIC TECHNOLOGIES CO., LTD. 7 QW-R107-015,A www.unisonic.com.tw UTC BA3308 Fig.8 ALC characteristics 60 Vcc=7V f=1kHz Gv=52dB OUTPUT VOLTAGE, VOUT (dBV) 40 LINEAR INTEGRATED CIRCUIT Fig.9 Input/output characteristics 10 10 8 OUTPUT VOLTAGE, VOUT (Vrms) VOUT 1 20 ch2 0 VOUT 6 4 ch1 0.1 Vcc=7V f=1kHz Gv=52dB RL=10k 0.01 -80 -70 -60 -50 -40 -30 -20 -20 2 -40 -80 -60 -40 -20 -0 0 20 INPUT VOLTAGE, VIN (dBV) INPUT VOLTAGE, VIN (dBV) Fig.10 Maximum output voltage vs. power supply voltage 1.6 MAXIMUM OUTPUT VOLTAGE, VOM (Vrms) 1.4 1.2 1 0.8 0.6 0.4 0.2 0 MAXIMUM OUTPUT VOLTAGE, VOM (Vrms) f=1kHz THD=1% RL=10k 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 100 Fig.11 Maximum output voltage vs. load resistance Vcc=7V f=1kHz THD=1% 0 2 4 8 14 12 6 10 POWER SUPPLY VOLTAGE, Vcc (V) 16 1k LOAD RESISTANCE, RL ( ) 10k UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UTC UNISONIC TECHNOLOGIES CO., LTD. 8 QW-R107-015,A www.unisonic.com.tw |
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