NSC LM146 Programmable quad operational amplifier Datasheet

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 µA)
n Programmable electrical characteristics
n Battery-powered operation
n Low supply current: 350 µA/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 µA)
Gain Bandwidth Product = 1 MHz (ISET/10 µA)
Slew Rate = 0.4V/µs (ISET/10 µA)
Input Bias Current ≅ 50 nA (ISET/10 µA)
ISET = Current into pin 8, pin 9 (see schematic-diagram)
Dual-In-Line Package
DS005654-1
Top View
Order Number LM146J, LM146J/883,
LM346M or LM346N
See NS Package Number
J16A, M16A or N16A
© 1999 National Semiconductor Corporation
DS005654
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LM146/LM346 Programmable Quad Operational Amplifiers
May 1999
Schematic Diagram
DS005654-2
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2
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.
LM146
LM346
± 22V
± 18V
Supply Voltage
± 30V
± 30V
Differential Input Voltage (Note 1)
± 15V
± 15V
CM Input Voltage (Note 1)
Power Dissipation (Note 2)
900 mW
500 mW
Output Short-Circuit Duration (Note 3)
Continuous
Continuous
Operating Temperature Range
−55˚C to +125˚C
0˚C to +70˚C
Maximum Junction Temperature
150˚C
100˚C
Storage Temperature Range
−65˚C to +150˚C
−65˚C to +150˚C
Lead Temperature (Soldering, 10 seconds)
260˚C
260˚C
Thermal Resistance (θjA), (Note 2)
Cavity DIP (J)
Pd
900 mW
900 mW
100˚C/W
100˚C/W
θjA
115˚C/W
Small Outline (M) θjA
Molded DIP (N) Pd
500 mW
90˚C/W
θjA
Soldering Information
Dual-In-Line Package
Soldering (10 seconds)
+260˚C
+260˚C
Small Outline Package
Vapor Phase (60 seconds)
+215˚C
+215˚C
Infrared (15 seconds)
+220˚C
+220˚C
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 µA), (Note 4)
Parameter
Conditions
LM146
Min
Input Offset Voltage
Input Offset Current
Input Bias Current
Supply Current (4 Op Amps)
Large Signal Voltage Gain
VCM = 0V, RS≤50Ω, TA = 25˚C
VCM = 0V, TA = 25˚C
VCM = 0V, TA = 25˚C
TA = 25˚C
RL = 10 kΩ, ∆VOUT = ± 10V,
TA = 25˚C
Input CM Range
TA = 25˚C
CM Rejection Ratio
Power Supply Rejection Ratio
RS≤10 kΩ, TA = 25˚C
RS≤10 kΩ, TA = 25˚C,
Output Voltage Swing
VS = ± 5 to ± 15V
RL≥10 kΩ, TA = 25˚C
Short-Circuit
Gain Bandwidth Product
TA = 25˚C
TA = 25˚C
Typ
LM346
Max
Min
Typ
Units
Max
0.5
5
0.5
6
2
20
2
100
mV
nA
50
100
50
250
nA
1.4
2.0
1.4
2.5
mA
100
1000
50
1000
± 13.5
± 14
± 13.5
± 14
V
80
100
70
100
dB
80
100
74
100
dB
± 12
± 14
± 12
± 14
5
20
5
20
0.8
1.2
0.5
1.2
35
V/mV
V
35
mA
MHz
60
60
Deg
Slew Rate
TA = 25˚C
TA = 25˚C
0.4
0.4
V/µs
Input Noise Voltage
f = 1 kHz, TA = 25˚C
28
28
Channel Separation
RL = 10 kΩ, ∆VOUT = 0V to
± 12V, TA = 25˚C
120
120
dB
Input Resistance
TA = 25˚C
1.0
1.0
MΩ
Input Capacitance
TA = 25˚C
VCM = 0V, RS≤50Ω
2.0
2.0
Phase Margin
Input Offset Voltage
0.5
3
6
0.5
pF
7.5
mV
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DC Electrical Characteristics
(Continued)
(VS = ± 15V, ISET = 10 µA), (Note 4)
Parameter
Conditions
LM146
Min
VCM = 0V
VCM = 0V
Input Offset Current
Input Bias Current
Supply Current (4 Op Amps)
RL = 10 kΩ, ∆VOUT = ± 10V
Large Signal Voltage Gain
LM346
Typ
Max
Min
Typ
Units
Max
2
25
2
100
nA
50
100
50
250
nA
1.7
2.2
1.7
2.5
50
1000
25
1000
mA
V/mV
± 13.5
± 14
± 13.5
± 14
V
CM Rejection Ratio
RS≤50Ω
70
100
70
100
dB
Power Supply Rejection Ratio
RS≤50Ω,
VS = ± 5V to ± 15V
76
100
74
100
dB
Output Voltage Swing
RL≥10 kΩ
± 12
± 14
± 12
± 14
V
Input CM Range
DC Electrical Characteristic
(VS = ± 15V, ISET = 10 µA)
Parameter
Conditions
LM146
Min
LM346
Typ
Max
5
Min
Units
Typ
Max
0.5
7
Input Offset Voltage
VCM = 0V, RS≤50Ω,
0.5
Input Bias Current
7.5
20
7.5
100
nA
Supply Current (4 Op Amps)
TA = 25˚C
VCM = 0V, TA = 25˚C
TA = 25˚C
140
250
140
300
µA
Gain Bandwidth Product
TA = 25˚C
80
100
50
100
mV
kHz
DC Electrical Characteristics
(VS = ± 1.5V, ISET = 10 µA)
Parameter
Conditions
LM146
Min
Input Offset Voltage
VCM = 0V, RS≤50Ω,
Input CM Range
TA = 25˚C
TA = 25˚C
CM Rejection Ratio
Output Voltage Swing
RS≤50Ω, TA = 25˚C
RL≥10 kΩ, TA = 25˚C
LM346
Typ
Max
0.5
5
± 0.7
Min
Max
0.5
7
± 0.7
80
± 0.6
mV
V
80
± 0.6
Units
Typ
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, θjA, and the ambient temperature,
TA. The maximum available power dissipation at any temperature is Pd = (TjMAX - TA)/θjA or the 25˚C 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.
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Typical Performance Characteristics
Input Bias Current vs ISET
Supply Current vs ISET
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Open Loop Voltage Gain
vs ISET
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Slew Rate vs ISET
Gain Bandwidth Product
vs ISET
Phase Margin vs ISET
DS005654-47
DS005654-49
DS005654-48
Input Offset Voltage
vs ISET
Common-Mode Rejection
Ratio vs ISET
Power Supply Rejection
Ratio vs ISET
DS005654-51
DS005654-50
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DS005654-52
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Typical Performance Characteristics
Open Voltage Swing vs
Supply Voltage
(Continued)
Input Voltage Range vs
Supply Voltage
Input Bias Current vs
Input Common-Mode
Voltage
DS005654-53
DS005654-54
DS005654-55
Input Bias Current vs
Temperature
Input Offset Current vs
Temperature
DS005654-56
Open Loop Voltage Gain
vs Temperature
Supply Current vs
Temperature
DS005654-57
Gain Bandwidth Product
vs Temperature
Slew Rate vs
Temperature
DS005654-20
DS005654-21
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DS005654-22
Typical Performance Characteristics
Input Noise Voltage vs
Frequency
(Continued)
Input Noise Current vs
Frequency
Power Supply Rejection
Ratio vs Frequency
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DS005654-23
Voltage Follower Pulse
Response
DS005654-25
Voltage Follower Transient
Response
DS005654-27
DS005654-26
Transient Response Test Circuit
DS005654-6
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.
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.
DS005654-7
FIGURE 1. Output Current Limit vs ISET
7
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Application Hints
power decreases proportionally and the VOSremains constant. The usable GBW range of the op amp is 10 kHz to
3.5−4 MHz.
(Continued)
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 1⁄2π (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.
DS005654-8
DS005654-9
FIGURE 3. LM146 Typical Characteristics
FIGURE 2.
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.
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 current, 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).
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.
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
DS005654-10
FIGURE 4. LM146 vs LM4250
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Typical Applications
Dual Supply or Negative Supply Blasing
Single (Positive) Supply Blasing
DS005654-39
DS005654-11
Current Source Blasing
with Temperature Compensation
Blasing all 4 Amplifiers
with Single Current Source
DS005654-40
• The LM334 provides an ISET directly proportional to absolute
temperature. This cancels the slight GBW product Temperature coefficient
of the LM346.
DS005654-41
• 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.
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Active Filters Applications
Basic (Non-Inverting “State Variable”) Active Filter Building Block
DS005654-12
DS005654-33
Note. All resistor values are given in ohms.
DS005654-34
DS005654-13
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Active Filters Applications
(Continued)
DS005654-35
A Simple-to-Design BP, LP Filter Building Block
DS005654-14
• 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
DS005654-36
• For the eventual use of amplifier C, see comments on the previous page.
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Active Filters Applications
(Continued)
A 3-Amplifier Notch Filter (or Elliptic Filter Building Block)
DS005654-15
Circuit Synthesis Equations
DS005654-37
• For nothing but a notch output: RIN = R, C' = C.
Capacitorless Active Filters (Basic Circuit)
DS005654-16
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Active Filters Applications
(Continued)
DS005654-38
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.
A 4th Order Butterworth Low Pass Capacitorless Filter
DS005654-17
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 (z1 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
DS005654-18
• For better performance, use a matched NPN pair.
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Miscellaneous Applications
(Continued)
Circuit Shutdown
DS005654-42
• 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
DS005654-43
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Miscellaneous Applications
(Continued)
X10 Micropower Instrumentation Amplifier with Buffered Input Guarding
DS005654-19
• CMRR: 100 dB (typ)
• Power dissipation: 0.4 mW
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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
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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
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