|
Details, datasheet, quote on part number:LM149
| |
Datasheet text preview:
LM148 LM149 Series Quad 741 Op Amp
February 1995
LM148 LM149 Series Quad 741 Op Amp
LM148 LM248 LM348 Quad 741 Op Amps LM149 LM349 Wide Band Decompensated (AV (MIN) e 5) General Description
The LM148 series is a true quad 741 It consists of four independent high gain internally compensated low power operational amplifiers which have been designed to provide functional characteristics identical to those of the familiar 741 operational amplifier In addition the total supply current for all four amplifiers is comparable to the supply current of a single 741 type op amp Other features include input offset currents and input bias current which are much less than those of a standard 741 Also excellent isolation between amplifiers has been achieved by independently biasing each amplifier and using layout techniques which minimize thermal coupling The LM149 series has the same features as the LM148 plus a gain bandwidth product of 4 MHz at a gain T of 5 or greater he LM148 can be used anywhere multiple 741 or 1558 type amplifiers are being used and in applications where amplifier matching or high packing density is required
Y Y Y Y Y Y Y Y
eatures
741 op amp operating characteristics Low supply current drain 0 6 mA Amplifier Class AB output stage no crossover distortion Pin compatible with the LM124 Low input offset voltage 1 mV Low input offset current 4 nA Low input bias current 30 nA Gain bandwidth product LM148 (unity gain) LM149 (AV t 5) High degree of isolation between amplifiers Overload protection for inputs and outputs 1 0 MHz 4 MHz 120 dB
Y Y
F
Schematic Diagram
TL H 7786 1
1 pF in the LM149
C1995 National Semiconductor Corporation TL H 7786 RRD-B30M115 Printed in U S A
Absolute Maximum Ratings
D If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office ( istributors for availability and specifications Note 4) LM148 LM149 LM248 LM348 LM349 g 22V g 18V g 18V Supply Voltage g 44V g 36V g 36V Differential Input Voltage Output Short Circuit Duration (Note 1) Power Dissipation (Pd at 25 C) and Thermal Resistance (ijA) (Note 2) Molded DIP (N) Pd ijA Cavity DIP (J) Pd iJA Maximum Junction Temperature (TjMAX) Operating Temperature Range Storage Temperature Range Lead Temperature (Soldering 10 sec ) Ceramic Lead Temperature (Soldering 10 sec ) Plastic Soldering Information Dual-In-Line Package Soldering (10 seconds) Small Outline Package Vapor Phase (60 seconds) Infrared (15 seconds) Continuous Continuous Continuous
1100 mW 110 C W 150 C b 55 C s TA s a 125 C b 65 C to a 150 C 300 C
800 mW 110 C W 110 C b 25 C s TA s a 85 C b 65 C to a 150 C 300 C
750 mW 100 C W 700 mW 110 C W 100 C 0 C s TA s a 70 C b 65 C to a 150 C 300 C 260 C
260 C 215 C 220 C
260 C 215 C 220 C
260 C 215 C 220 C
See AN-450 ``Surface Mounting Methods and Their Effect on Product Reliability'' for other methods of soldering surface mount E devices SD tolerance (Note 5) 500V 500V 500V
Electrical Characteristics (Note 3)
Parameter Input Offset Voltage Input Offset Current Input Bias Current Input Resistance Large Signal Voltage Gain Amplifier to Amplifier Coupling Small Signal Bandwidth Conditions TA e 25 C RS s 10 kX TA e 25 C TA e 25 C TA e 25 C TA e 25 C VS e g 15V VOUT e g 10V RL t 2 kX TA e 25 C f e 1 Hz to 20 kHz (Input Referred) See Crosstalk Test Circuit LM148 Series TA e 25 C LM149 Series LM148 Series (AV e 1) TA e 25 C LM149 Series (AV e 5) LM148 Series (AV e 1) TA e 25 C LM149 Series (AV e 5) TA e 25 C RS s 10 kX 08 LM148 LM149 Min Typ 10 4 30 25 24 50 160 36 25 Max Min 50 25 100 08 LM248 Typ 10 4 30 25 24 160 45 25 60 50 200 08 LM348 LM349 Max Min Typ 10 4 30 25 24 160 45 Max 60 50 200 mV nA nA MX mA V mV Units
Supply Current All Amplifiers TA e 25 C VS e g 15V
b 120
b 120
b 120
dB MHz MHz degrees degrees V ms V ms mA 75 100 400 mV nA nA
10 40 60 60 05 20 25 60 75 325
10 40 60 60 05 20 25 75 125 500
10 40 60 60 05 20 25
Phase Margin
Slew Rate
Output Short Circuit Current Input Offset Voltage Input Offset Current Input Bias Current
2
Electrical Characteristics (Note 3) (Continued)
Parameter Conditions LM148 LM149 Min Large Signal Voltage Gain VS e g 15V VOUT e g 10V RL l 2 k X Output Voltage Swing Input Voltage Range Common-Mode Rejection Ratio Supply Voltage Rejection VS e g 15V RL e 10 kX RL e 2 k X VS e g 15V RS s 10 kX RS s 10 kX g5V s VS s g 15V 2 5
g 13 g 12
LM248 Min 15
g 12 g 10 g 12 g 13 g 12
LM348 LM349 Max Min 15
g 12 g 10 g 12 g 13 g 12
Units V mV V V V
Typ
Max
Typ
Typ
Max
g 12 g 10 g 12
70 77
90 96
70 77
90 96
70 77
90 96
dB dB
Note 1 Any of the amplifier outputs can be shorted to ground indefinitely however more than one should not be simultaneously shorted as the maximum junction N temperature will be exceeded T ote 2 The maximum power dissipation for these devices must be derated at elevated temperatures and is dicated by TjMAX ijA and the ambient temperature NA The maximum available power dissipation at any temperature is Pd e (TjMAX b TA) ijA or the 25 C PdMAX whichever is less Note 3 These specifications apply for VS e g 15V and over the absolute maximum operating temperature range (TL s TA s TH) unless otherwise noted Note 4 Refer to RETS 148X for LM148 military specifications and refer to RETS 149X for LM149 military specifications Cte 5 Human body model 1 5 kX in series with 100 pF o
ross Talk Test Circuit
TL H 7786 6
Crosstalk e b 20 log VS e g 15V
e OUT (dB) 101 c eOUT
TL H 7786 7
Application Hints
The LM148 series are quad low power 741 op amps In the proliferation of quad op amps these are the first to offer the convenience of familiar easy to use operating characteristics of the 741 op amp In those applications where 741 op amps have been employed the LM148 series op amps can T be employed directly with no change in circuit performance he LM149 series has the same characteristics as the LM148 except it has been decompensated to provide a wider bandwidth As a result the part requires a minimum T gain of 5 he package pin-outs are such that the inverting input of each amplifier is adjacent to its output In addition the amplifier outputs are located in the corners of the package which simplifies PC board layout and minimizes package T related capacitive coupling between amplifiers he input characteristics of these amplifiers allow differential input voltages which can exceed the supply voltages In addition if either of the input voltages is within the operating common-mode range the phase of the output remains correct If the negative limit of the operating common-mode range is exceeded at both inputs the output voltage will be positive For input voltages which greatly exceed the maxir mum supply voltages either differentially or common-mode esistors should be placed in series with the inputs to limit L the current ike the LM741 these amplifiers can easily drive a 100 pF capacitive load throughout the entire dynamic output voltage and current range However if very large capacitive loads must be driven by a non-inverting unity gain amplifier resistor should be placed between the output (and feedback connection) and the capacitance to reduce the phase T shift resulting from the capacitive loading he output current of each amplifier in the package is limited Short circuits from an output to either ground or the power supplies will not destroy the unit However if multiple output shorts occur simultaneously the time duration should be short to prevent the unit from being destroyed as a result A of excessive power dissipation in the IC chip c s with most amplifiers care should be taken lead dress omponent placement and supply decoupling in order to ensure stability For example resistors from the output to an input should be placed with the body close to the input to minimize ``pickup'' and maximize the frequency of the feedback pole which capacitance from the input to ground creA ates feedback pole is created when the feedback around any amplifier is resistive The parallel resistance and capacitance from the input of the device (usually the inverting input) to AC ground set the frequency of the pole In many instances the frequency of this pole is much greater than the expected 3 dB frequency of the closed loop gain and H consequently there is negligible effect on stability margin owever if the feedback pole is less than approximately six times the expected 3 dB frequency a lead capacitor should be placed from the output to the input of the op amp The value of the added capacitor should be such that the RC time constant of this capacitor and the resistance it parallels is greater than or equal to the original feedback pole time a constant
3
|
|
