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| UNISONIC TECHNOLOGIES CO., LTD L3305 LOW VOLTAGE CLASS B AMPLIFIER DESCRIPTION The UTC L3305 can be operated as a class B amplifier. It can also operated as a medium power "vari-bias" class A amplifier. It include a preamplifier with adjustable gain and a power amplifier. SOP-14 LINEAR INTEGRATED CIRCUIT FEATURES * Low Operating Voltage range (1V 3V) * Low Operating current consumption * Feedback stabilized gain less than 80 dB * Output power exceeds 140 dBSPL TSSOP-14 *Pb-free plating product number: L3305L ORDERING INFORMATION Ordering Number Normal Lead Free Plating L3305-S14-R L3305L-S14-R L3305-S14-T L3305L-S14-T L3305-P14-R L3305L-P14-R L3305-P14-T L3305L-P14-T L3305L-S14-T (1)Packing Type (2)Package Type (3)Lead Plating (1) R: Tape Reel, T: Tube (2) S14: SOP-14, P14: TSSOP-14 (3) L: Lead Free Plating, Blank: Pb/Sn Package SOP-14 SOP-14 TSSOP-14 TSSOP-14 Packing Tape Reel Tube Tape Reel Tube www.unisonic.com.tw Copyright (c) 2005 Unisonic Technologies Co., Ltd 1 of 6 QW-R107-052,A L3305 PIN CONFIGURATION LINEAR INTEGRATED CIRCUIT OUTPUT STAGE I /P DEC A OUTPUT A O/P GND MIC BIAS PREAMP I/P PREAMP GND 1 2 3 4 5 6 7 14 CURRENT TRIM 13 DEC B 12 OUTPUT B 11 VCC2 10 VCC1 9 8 FEEDBACK PREAMP O/P UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 6 QW-R107-052,A L3305 BLOCK DIAGRAM VCC2 11 MIC 5 BIAS LINEAR INTEGRATED CIRCUIT CURRENT OUTPUT A TRIM OUTPUT B 14 3 12 2.2k 470 VCC1 10 FEEDBACK 9 4 O/P GND 13 DEC B OUTPUT STAGE 2 DEC A PREAMP 6 I/P PREAMP 7 PREAMP GND 8 PREAMP O/P 1 OUTPUT STAGE I/P UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 6 QW-R107-052,A L3305 ABSOLUTE MAXIMUM RATINGS LINEAR INTEGRATED CIRCUIT PARAMETER SYMBOL RATINGS UNIT Supply Voltage Vcc1 3 V Power Dissipation PD 200 mW Operating Temperature Range TOPR -10 ~ +60 Storage Temperature Range TSTG -20 ~ +70 Note Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. ELECTRICAL CHARACTERISTICS PARAMETER Input Referred Noise Total Current Voltage Gain Total Harmonic Distortion & Noise Gain Dependence on RB Input Impedance of Output Amplifier Stable with Battery Resistance Frequency Response (-3 dB at 1 kHz) SYMBOL TEST CONDITIONS eN ITOT GV Output = 0.707 VRMS THD Output = 0.707 VRMS ZIN Low High MIN TYP 0.9 0.7 75 1.5 0.02 27 250 12 MAX 2.5 1.2 78 3.0 36 22 UNIT V mA dB % dB/ k Hz kHz 72 18 Note: 1. All parameters tested in Test Circuit Fig. 1. 2. Conditions: Supply voltage VB= 1.3 VDC, Temperature ambient = 25 , Frequency = 1kHz, Noise Filter Bandwidth at 12 dB/oct (0.2 to 10kHz) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 6 QW-R107-052,A L3305 TEST CURICT LINEAR INTEGRATED CIRCUIT VB = 1.30 VDC 10 820 VI 20k RIN 3.9k 1kHz 220 0.1 10 10 1 2 3 4 RF 200k 14 13 12 R L= 470 HAMMOND 99966 RB 4.7 10 VO N/C 0.1 N/C 10 11 UTC L3305 5 10 6 9 8 7 0.1 VC 10k 0.1 0.1 Note: 1. Test Circuit Amplifier Gain = 20 Log10 ( VOUT / VIN ) + 40dB RF 2. Preamp Gain = set at 35dB RIN Fig. 1 Test Circuit 1 6.8 2 3 4 5 10 MIC 0.1 220k 6 7 UTC L3305 14 13 12 11 10 9 8 N/C 6.8 0.1 Receiver 400 Impedance VB = 1.30 VDC 10 N/C 10k 0.1 0.1 0.1 Fig. 2 Typical Hearing Aid Circuit UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 6 QW-R107-052,A L3305 LINEAR INTEGRATED CIRCUIT 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. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 6 QW-R107-052,A |
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