1/4 Structure : Silicon Monolithic Integrated Circuit Product : 3 Dual operational amplifier with switch for car audio systems Type : BA3131FS Function : 1. High gain and low distortion. (Gv = 110dB, THD = 0.0015% typ.) 2. Low noise. (Vn = 2Vrms typ.) 3. Switching circuit can be directly coupled to microcomputer port. 4. Small switching noise. 5. Equipped with 1/2 Vcc output circuit for single power supply. Absolute Maximum Ratings (Ta=25℃) Symbol Rating Parameter Power supply voltage Vcc 18.0 Power dissipation Pd 750* Operating temperature Topr －40～＋85 Storage temperature Tastg －55～＋125 Common-mode input voltage Vi 3～Vcc Differential input voltage Vid Vcc Load current IoMax. ±50.0 ※This value decreases 7.5 mW/℃ for Ta=25℃ or more. (When mounted on a glass epoxy board (90mm 50mm 1.6t)) Operating Voltage Range (Ta=25℃) Symbol Parameter Power supply voltage Vcc Unit V mW ℃ ℃ V V mA Min. Typ. Max. Unit 6.0 8.0 16.0 V Conditions Single power source Application example Note that ROHM cannot provide adequate confirmation of patents. The product described in this specification is designed to be used with ordinary electronic equipment or devices (such as audio-visual equipment, office-automation equipment, communications devices, electrical appliances, and electronic toys). Should you intend to use this product with equipment or devices which require an extremely high level of reliability and the malfunction of which would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. REV. B 2/4 Electrical characteristics （unless otherwise noted, Ta=25℃, Vcc=8V） Parameter Symbol Limit Min. Typ. Max. Unit Conditions Quiescent current Input offset voltage Input offset current Input bias current High-amplitude voltage gain Common-mode input voltage In-phase signal rejection ratio Iq Vio Iio Ib Avol Vicm CMRR 2.0 － － － 86 3 60 4.9 0.5 5 50 110 6 72 7.8 5.0 200 500 － － － mA mV nA nA dB V dB VIN＝0,RL=∞,SW pin open RS≦10kΩ Power supply voltage rejection ratio PSRR 76 90 － dB RS≦10kΩ ＊ 1 RL≧2kΩ，VO=±1.5V RS≦10kΩ RL≧10kΩ 3 6 － V RL≧2kΩ 3 6 － V ＊ 2 Input conversion noise voltage Vn － 2.0 4.0 μVrms Ioref=±1mA Reference voltage change ΔVREF － － ±10 mV 0. 1 Because the first stage is configured with PNP transistors, input bias current is from the IC. 0. 2 Tested under the following conditions: Gv = 40dB, RS = 2kΩ, Matsushita Tsuko VP-9690A (using DIN audio filter) Maximum output voltage VOH/VOL Design guaranteed values （unless otherwise noted, Ta=25℃, Vcc=8V） Parameter Symbol Limit Min. Typ. Max. Unit Slew rate Gainbandwidth product Crosstalk between A, B and C SR GBW CTABC 0.5 1.5 60 1.2 2.6 73 － － － V/μS MHz dB Total harmonic distortion THD － 0.0025 0.01 ％ 115 － dB Channel separation CS 90 ※This item is not guaranteed during processes. Outline Dimension BA3131FS LOT No. SSOP-A20 （Unit：mm） REV. B Conditions Gv＝0dB,RL=2kΩ f＝10kHz f＝1kHz Gv＝0dB，f＝1kHz， Vo＝1Vrms f＝1kHz,input conversion 3/4 Block Diagram Terminal Number/ Terminal Name Terminal Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Terminal Name +IN1A -IN1A +IN1B -IN1B +IN1C -IN1C OUT1 SW1 SW2 GND Vcc 1/2 Vcc Vref OUT OUT2 -IN2C +IN2C -IN2B +IN2B -IN2A +IN2A Application example (1) Numbers and data in entries are representative design values and are not guaranteed values of the items. (2)Although we are confident in recommending the sample application circuits, carefully check their characteristics further when using them. When modifying externally attached component constants before use, determine them so that they have sufficient margins by taking into account variations in externally attached components and the Rohm LSI, not only for static characteristics but also including transient characteristics. (3) Absolute maximum ratings If applied voltage, operating temperature range, or other absolute maximum ratings are exceeded, the LSI may be damaged. Do not apply voltages or temperatures that exceed the absolute maximum ratings. If you think of a case in which absolute maximum ratings are exceeded, enforce fuses or other physical safety measures and investigate how not to apply the conditions under which absolute maximum ratings are exceeded to the LSI. (4) GND potential Make the GND pin voltage such that it is the lowest voltage even when operating below it. Actually confirm that the voltage of each pin does not become a lower voltage than the GND pin, including transient phenomena. (5) Thermal design Perform thermal design in which there are adequate margins by taking into account the allowable power dissipation in actual states of use. REV. B 4/4 (6) Shorts between pins and misinstallation When mounting the LSI on a board, pay adequate attention to orientation and placement discrepancies of the LSI. If it is misinstalled and the power is turned on, the LSI may be damaged. It also may be damaged if it is shorted by a foreign substance coming between pins of the LSI or between a pin and a power supply or a pin and a GND. (7) Operation in strong magnetic fields Adequately evaluate use in a strong magnetic field, since there is a possibility of malfunction. (8) The 13 Pin is the reference output terminal, which outputs 1/2 Vcc. Determine the bypass condenser value in accordance with the desired characteristics. In addition, as the value may oscillate within the 500pF- 1F, make sure to set the bypass condenser value of more than 10F for alternate grounding. Further, as 12 pin is located in the reference circuit, make sure to use bypass condenser for ac grounding for reference output. (Recommended value22F) Reference data (these values are intended only as a reference, and performance is not guaranteed) 12 pin bypass capacitor（F） 10 22 47 ＊ Ripple Rejection （fin=100Hz）（dB） －35 －42 －48 Output Startup Time 150 300 550 Measuring condition: With Power Voltage ON (Vcc=8V), Vcc path control, 13 pin path control100F, the time which is 90% of equilibrium output voltage (9) This IC can be stably used in the low grain range (0-2dB). It may oscillate at the capacity load of more than 200pF. [the phase margin 10°Typ.（Ta=85℃, 0dB point）for capacity 200pF] Therefore, caution is required for using capacity load. In addition, for using 0db buffer, inserting bias resister of kΩ to minus input will enable stable use against the capacity load. (10) Truth value table SW1（8pin） SW2（9pin） ch1 H H ch2 H L ch3 L H OFF L L Conditions Correspons to COM output ※“H” when the applied at pins8 and 9 is 2.0V or more, and “L” when it is 1.0V or less. REV. B Notice Notes No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM upon request. Examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the Products. The peripheral conditions must be taken into account when designing circuits for mass production. Great care was taken in ensuring the accuracy of the information specified in this document. However, should you incur any damage arising from any inaccuracy or misprint of such information, ROHM shall bear no responsibility for such damage. The technical information specified herein is intended only to show the typical functions of and examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by ROHM and other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. The Products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices). The Products specified in this document are not designed to be radiation tolerant. While ROHM always makes efforts to enhance the quality and reliability of its Products, a Product may fail or malfunction for a variety of reasons. Please be sure to implement in your equipment using the Products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM shall bear no responsibility whatsoever for your use of any Product outside of the prescribed scope or not in accordance with the instruction manual. The Products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuelcontroller or other safety device). ROHM shall bear no responsibility in any way for use of any of the Products for the above special purposes. If a Product is intended to be used for any such special purpose, please contact a ROHM sales representative before purchasing. If you intend to export or ship overseas any Product or technology specified herein that may be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to obtain a license or permit under the Law. Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact us. ROHM Customer Support System http://www.rohm.com/contact/ www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. R1120A