LM146,LM346 LM146/LM346 Programmable Quad Operational Amplifiers Literature Number: SNOSBH5B LM146/LM346 Programmable Quad Operational Amplifiers General Description Features The LM146 series of quad op amps consists of four independent, high gain, internally compensated, low power, programmable amplifiers. Two external resistors (RSET) allow the user to program the gain bandwidth product, slew rate, supply current, input bias current, input offset current and input noise. For example, the user can trade-off supply current for bandwidth or optimize noise figure for a given source resistance. In a similar way, other amplifier characteristics can be tailored to the application. Except for the two programming pins at the end of the package, the LM146 pin-out is the same as the LM124 and LM148. (ISET=10 A) n Programmable electrical characteristics n Battery-powered operation n Low supply current: 350 A/amplifier n Guaranteed gain bandwidth product: 0.8 MHz min n Large DC voltage gain: 120 dB n Low noise voltage: 28 n Wide power supply range: 1.5V to 22V n Class AB output stage-no crossover distortion n Ideal pin out for Biquad active filters n Input bias currents are temperature compensated Connection Diagram PROGRAMMING EQUATIONS Total Supply Current = 1.4 mA (ISET/10 A) Gain Bandwidth Product = 1 MHz (ISET/10 A) Slew Rate = 0.4V/s (ISET/10 A) Input Bias Current . 50 nA (ISET/10 A) ISET = Current into pin 8, pin 9 (see schematic-diagram) Dual-In-Line Package 00565401 Top View Order Number LM146J, LM146J/883, LM346M,LM346MX or LM346N See NS Package Number J16A, M16A or N16A Capacitorless Active Filters (Basic Circuit) 00565416 (c) 2004 National Semiconductor Corporation DS005654 www.national.com LM146/LM346 Programmable Quad Operational Amplifiers August 2000 LM146/LM346 Absolute Maximum Ratings (Notes 1, 5) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Differential Input Voltage (Note 1) CM Input Voltage (Note 1) Power Dissipation (Note 2) 22V 30V 15V 18V 30V 15V 900 mW 500 mW Continuous -55C to +125C 0C to +70C 150C 100C -65C to +150C -65C to +150C 260C 260C Maximum Junction Temperature Storage Temperature Range LM346 Continuous Output Short-Circuit Duration (Note 3) Operating Temperature Range LM146 Lead Temperature (Soldering, 10 seconds) Thermal Resistance (jA), (Note 2) Cavity DIP (J) Pd 900 mW 900 mW jA 100C/W 100C/W Small Outline (M) jA 115C/W Molded DIP (N) Pd 500 mW jA 90C/W Soldering Information Dual-In-Line Package Soldering (10 seconds) +260C +260C Vapor Phase (60 seconds) +215C +215C Infrared (15 seconds) +220C +220C Small Outline Package See AN-450 "Surface Mounting Methods and Their Effect on Product Reliability" for other methods of soldering surface mount devices. ESD rating is to be determined. DC Electrical Characteristics (VS= 15V, ISET=10 A), (Note 4) Parameter Conditions LM146 Min LM346 Typ Max 0.5 5 Min Units Typ Max 0.5 6 Input Offset Voltage VCM=0V, RS50, TA=25C Input Offset Current VCM=0V, TA=25C 2 20 2 100 nA Input Bias Current VCM=0V, TA=25C 50 100 50 250 nA Supply Current (4 Op Amps) TA=25C 1.4 2.0 1.4 2.5 mA Large Signal Voltage Gain RL=10 k, VOUT= 10V, 100 1000 50 1000 mV V/mV TA=25C Input CM Range TA=25C 13.5 14 13.5 14 V CM Rejection Ratio RS10 k, TA=25C 80 100 70 100 dB Power Supply Rejection Ratio RS10 k, TA=25C, 80 100 74 100 dB 12 14 12 14 V VS = 5 to 15V Output Voltage Swing RL10 k, TA=25C Short-Circuit TA=25C 5 20 Gain Bandwidth Product TA=25C 0.8 1.2 Phase Margin TA=25C Slew Rate Input Noise Voltage Channel Separation RL=10 k, VOUT=0V to www.national.com 5 20 0.5 1.2 MHz 60 60 Deg TA=25C 0.4 0.4 V/s f=1 kHz, TA=25C 28 28 120 120 2 35 35 mA dB (Continued) (VS= 15V, ISET=10 A), (Note 4) Parameter Conditions LM146 Min LM346 Typ Max Min Typ Units Max 12V, TA=25C Input Resistance TA=25C 1.0 Input Capacitance TA=25C 2.0 Input Offset Voltage VCM=0V, RS50 0.5 6 0.5 7.5 mV Input Offset Current VCM=0V 2 25 2 100 nA Input Bias Current VCM=0V 50 100 50 250 nA 1.7 2.2 1.7 2.5 mA Supply Current (4 Op Amps) RL=10 k, VOUT= 10V Large Signal Voltage Gain Input CM Range 1.0 M 2.0 pF 50 1000 25 1000 13.5 14 13.5 14 V/mV V CM Rejection Ratio RS50 70 100 70 100 dB Power Supply Rejection Ratio RS50, 76 100 74 100 dB 12 14 12 14 V VS = 5V to 15V Output Voltage Swing RL10 k DC Electrical Characteristic (VS= 15V, ISET=10 A) Parameter Conditions LM146 Min LM346 Typ Max 0.5 5 Min Units Typ Max 0.5 7 Input Offset Voltage VCM=0V, RS50, Input Bias Current VCM=0V, TA=25C 7.5 20 7.5 100 nA Supply Current (4 Op Amps) TA=25C 140 250 140 300 A Gain Bandwidth Product TA=25C mV TA=25C 80 100 50 100 kHz DC Electrical Characteristics (VS= 1.5V, ISET=10 A) Parameter Conditions LM146 Min Input Offset Voltage VCM=0V, RS50, LM346 Typ Max 0.5 5 Min Units Typ Max 0.5 7 mV TA=25C Input CM Range TA=25C CM Rejection Ratio RS50, TA=25C Output Voltage Swing RL10 k, TA=25C 0.7 0.7 80 0.6 V 80 0.6 dB V Note 1: For supply voltages less than 15V, the absolute maximum input voltage is equal to the supply voltage. Note 2: The maximum power dissipation for these devices must be derated at elevated temperatures and is dictated by TjMAX, jA, and the ambient temperature, TA. The maximum available power dissipation at any temperature is Pd=(TjMAX - TA)/jA or the 25C PdMAX, whichever is less. Note 3: Any of the amplifier outputs can be shorted to ground indefinitely; however, more than one should not be simultaneously shorted as the maximum junction temperature will be exceeded. Note 4: These specifications apply over the absolute maximum operating temperature range unless otherwise noted. Note 5: Refer to RETS146X for LM146J military specifications. 3 www.national.com LM146/LM346 DC Electrical Characteristics LM146/LM346 Typical Performance Characteristics Input Bias Current vs ISET Supply Current vs ISET 00565444 00565445 Open Loop Voltage Gain vs ISET Slew Rate vs ISET 00565447 00565446 Gain Bandwidth Product vs ISET Phase Margin vs ISET 00565448 www.national.com 00565449 4 LM146/LM346 Typical Performance Characteristics (Continued) Input Offset Voltage vs ISET Common-Mode Rejection Ratio vs ISET 00565451 00565450 Power Supply Rejection Ratio vs ISET Open Voltage Swing vs Supply Voltage 00565452 00565453 Input Bias Current vs Input Common-Mode Voltage Input Voltage Range vs Supply Voltage 00565455 00565454 5 www.national.com LM146/LM346 Typical Performance Characteristics (Continued) Input Bias Current vs Temperature Input Offset Current vs Temperature 00565457 00565456 Supply Current vs Temperature Open Loop Voltage Gain vs Temperature 00565458 00565420 Gain Bandwidth Product vs Temperature Slew Rate vs Temperature 00565422 00565421 www.national.com 6 LM146/LM346 Typical Performance Characteristics (Continued) Input Noise Voltage vs Frequency Input Noise Current vs Frequency 00565424 00565423 Power Supply Rejection Ratio vs Frequency Voltage Follower Pulse Response 00565426 00565425 Voltage Follower Transient Response Transient Response Test Circuit 00565406 00565427 7 www.national.com LM146/LM346 rent, ISET, of the device, the GBW product will decrease with increasing temperature. Compensation can be provided by creating an ISET current directly proportional to temperature (see typical applications). Application Hints Avoid reversing the power supply polarity; the device will fail. COMMON-MODE INPUT VOLTAGE The negative common-mode voltage limit is one diode drop above the negative supply voltage. Exceeding this limit on either input will result in an output phase reversal. The positive common-mode limit is typically 1V below the positive supply voltage. No output phase reversal will occur if this limit is exceeded by either input. ISOLATION BETWEEN AMPLIFIERS The LM146 die is isothermally layed out such that crosstalk between all 4 amplifiers is in excess of -105 dB (DC). Optimum isolation (better than -110 dB) occurs between amplifiers A and D, B and C; that is, if amplifier A dissipates power on its output stage, amplifier D is the one which will be affected the least, and vice versa. Same argument holds for amplifiers B and C. OUTPUT VOLTAGE SWING VS ISET For a desired output voltage swing the value of the minimum load depends on the positive and negative output current capability of the op amp. The maximum available positive output current, (ICL+), of the device increases with ISET whereas the negative output current (ICL-) is independent of ISET. Figure 1 illustrates the above. LM146 TYPICAL PERFORMANCE SUMMARY The LM146 typical behaviour is shown in Figure 3. The device is fully predictable. As the set current, ISET, increases, the speed, the bias current, and the supply current increase while the noise power decreases proportionally and the VOSremains constant. The usable GBW range of the op amp is 10 kHz to 3.5-4 MHz. 00565407 FIGURE 1. Output Current Limit vs ISET INPUT CAPACITANCE The input capacitance, CIN, of the LM146 is approximately 2 pF; any stray capacitance, CS, (due to external circuit circuit layout) will add to CIN. When resistive or active feedback is applied, an additional pole is added to the open loop frequency response of the device. For instance with resistive feedback (Figure 2), this pole occurs at 12 (R1||R2) (CIN + CS). Make sure that this pole occurs at least 2 octaves beyond the expected -3 dB frequency corner of the closed loop gain of the amplifier; if not, place a lead capacitor in the feedback such that the time constant of this capacitor and the resistance it parallels is equal to the RI(CS + CIN), where RI is the input resistance of the circuit. 00565408 FIGURE 3. LM146 Typical Characteristics Low Power Supply Operation: The quad op amp operates down to 1.3V supply. Also, since the internal circuitry is biased through programmable current sources, no degradation of the device speed will occur. SPEED VS POWER CONSUMPTION LM146 vs LM4250 (single programmable). Through Figure 4, we observe that the LM146's power consumption has been optimized for GBW products above 200 kHz, whereas the LM4250 will reach a GBW of no more than 300 kHz. For GBW products below 200 kHz, the LM4250 will consume less power. 00565409 FIGURE 2. TEMPERATURE EFFECT ON THE GBW The GBW (gain bandwidth product), of the LM146 is directly proportional to ISET and inversely proportional to the absolute temperature. When using resistors to set the bias curwww.national.com 8 (Continued) LM146/LM346 Application Hints Single (Positive) Supply Blasing 00565410 FIGURE 4. LM146 vs LM4250 00565411 Typical Applications Dual Supply or Negative Supply Blasing Current Source Blasing with Temperature Compensation 00565439 00565440 * The LM334 provides an ISET directly proportional to absolute temperature. This cancels the slight GBW product Temperature coefficient of the LM346. 9 www.national.com LM146/LM346 Typical Applications (Continued) Blasing all 4 Amplifiers with Single Current Source 00565441 * For ISET1.ISET2 resistors R1 and R2 are not required if a slight error between the 2 set currents can be tolerated. If not, then use R1 = R2 to create a 100 mV drop across these resistors. Active Filters Applications Basic (Non-Inverting "State Variable") Active Filter Building Block 00565412 www.national.com 10 LM146/LM346 Active Filters Applications (Continued) 00565433 Note. All resistor values are given in ohms. 00565434 00565413 00565435 11 www.national.com LM146/LM346 Active Filters Applications (Continued) A Simple-to-Design BP, LP Filter Building Block 00565414 * If resistive biasing is used to set the LM346 performance, the Qo of this filter building block is nearly insensitive to the op amp's GBW product temperature drift; it has also better noise performance than the state variable filter. Circuit Synthesis Equations 00565436 * For the eventual use of amplifier C, see comments on the previous page. A 3-Amplifier Notch Filter (or Elliptic Filter Building Block) 00565415 Circuit Synthesis Equations 00565437 * For nothing but a notch output: RIN=R, C'=C. www.national.com 12 LM146/LM346 Active Filters Applications (Continued) Capacitorless Active Filters (Basic Circuit) 00565416 00565438 1. Pick up a convenient value for b; (b < 1) 2. Adjust Qo through R5 3. Adjust Ho(BP) through R4 4. Adjust fo through RSET. This adjusts the unity gain frequency (fu) of the op amp. 13 www.national.com LM146/LM346 Active Filters Applications (Continued) A 4th Order Butterworth Low Pass Capacitorless Filter 00565417 Ex: fc = 20 kHz, Ho (gain of the filter) = 1, Q01 = 0.541, Qo2 = 1.306. * Since for this filter the GBW product of all 4 amplifiers has been designed to be the same (1 MHz) only one current source can be used to bias the circuit. Fine tuning can be further accomplished through Rb. Miscellaneous Applications A Unity Gain Follower with Bias Current Reduction 00565418 * For better performance, use a matched NPN pair. www.national.com 14 LM146/LM346 Miscellaneous Applications (Continued) Circuit Shutdown 00565442 * By pulling the SET pin(s) to V- the op amp(s) shuts down and its output goes to a high impedance state. According to this property, the LM346 can be used as a very low speed analog switch. Voice Activated Switch and Amplifier 00565443 15 www.national.com LM146/LM346 Miscellaneous Applications (Continued) X10 Micropower Instrumentation Amplifier with Buffered Input Guarding 00565419 * CMRR: 100 dB (typ) * Power dissipation: 0.4 mW Schematic Diagram 00565402 www.national.com 16 LM146/LM346 Physical Dimensions inches (millimeters) unless otherwise noted Cavity Dual-In-Line Package (J) Order Number LM146J, LM146J/883 NS Package Number J16A S.O. Package (M) Order Number LM346M NS Package Number M16A 17 www.national.com LM146/LM346 Programmable Quad Operational Amplifiers Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Molded Dual-In-Line Package (N) Order Number LM346N NS Package Number N16A LIFE SUPPORT POLICY NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ``Banned Substances'' as defined in CSP-9-111S2. National Semiconductor Americas Customer Support Center Email: new.feedback@nsc.com Tel: 1-800-272-9959 www.national.com National Semiconductor Europe Customer Support Center Fax: +49 (0) 180-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Francais Tel: +33 (0) 1 41 91 8790 National Semiconductor Asia Pacific Customer Support Center Email: ap.support@nsc.com National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: jpn.feedback@nsc.com Tel: 81-3-5639-7560 National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. 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