LM613
LM613 Dual Operational Amplifiers, Dual Comparators, and Adjustable
Reference
Literature Number: SNOSC11A
LM613
Dual Operational Amplifiers, Dual Comparators, and
Adjustable Reference
General Description
The LM613 consists of dual op-amps, dual comparators, and
a programmable voltage reference in a 16-pin package. The
op-amps out-performs most single-supply op-amps by pro-
viding higher speed and bandwidth along with low supply
current. This device was specifically designed to lower cost
and board space requirements in transducer, test, measure-
ment, and data acquisition systems.
Combining a stable voltage reference with wide output swing
op-amps makes the LM613 ideal for single supply transduc-
ers, signal conditioning and bridge driving where large
common-mode-signals are common. The voltage reference
consists of a reliable band-gap design that maintains low
dynamic output impedance (1Ωtypical), excellent initial tol-
erance (0.6%), and the ability to be programmed from 1.2V
to 6.3V via two external resistors. The voltage reference is
very stable even when driving large capacitive loads, as are
commonly encountered in CMOS data acquisition systems.
As a member of National’s Super-Block™family, the LM613
is a space-saving monolithic alternative to a multi-chip solu-
tion, offering a high level of integration without sacrificing
performance.
Features
OP AMP
nLow operating current (Op Amp): 300 µA
nWide supply voltage range: 4V to 36V
nWide common-mode range: V
−
to (V
+
− 1.8V)
nWide differential input voltage: ±36V
nAvailable in plastic package rated for Military Temp.
Range Operation
REFERENCE
nAdjustable output voltage: 1.2V to 6.3V
nTight initial tolerance available: ±0.6%
nWide operating current range: 17 µA to 20 mA
nTolerant of load capacitance
Applications
nTransducer bridge driver
nProcess and mass flow control systems
nPower supply voltage monitor
nBuffered voltage references for A/D’s
Connection Diagrams
E Package Pinout
00922601
Top View 00922648
Ultra Low Noise, 10.00V Reference.
Total output noise is typically 14 µV
RMS
.
00922643
*10k must be low
t.c. trimpot
Super-Block™is a trademark of National Semiconductor Corporation.
August 2000
LM613 Dual Operational Amplifiers, Dual Comparators, and Adjustable Reference
© 2004 National Semiconductor Corporation DS009226 www.national.com
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Voltage on Any Pin Except V
R
(referred to V
−
pin)
(Note 2)
(Note 3)
36V (Max)
−0.3V (Min)
Current through Any Input Pin
&V
R
Pin ±20 mA
Differential Input Voltage
Military and Industrial
Commercial
±36V
±32V
Storage Temperature Range −65˚C ≤T
J
≤+150˚C
Maximum Junction Temp.(Note 4) 150˚C
Thermal Resistance,
Junction-to-Ambient (Note 5)
N Package
WM Package
100˚C/W
150˚C/W
Soldering Information (10 Sec.)
N Package
WM Package
260˚C
220˚C
ESD Tolerance (Note 6) ±1kV
Operating Temperature Range
LM613AI, LM613BI: −40˚C to +85˚C
LM613AM, LM613M: −55˚C to +125˚C
LM613C: 0˚C ≤T
J
≤+70˚C
Electrical Characteristics
These specifications apply for V
−
= GND = 0V, V
+
= 5V, V
CM
=V
OUT
= 2.5V, I
R
= 100 µA, FEEDBACK pin shorted to GND,
unless otherwise specified. Limits in standard typeface are for T
J
= 25˚C; limits in boldface type apply over the Operating
Temperature Range.
LM613AM LM613M
Typical LM613AI LM613I
Symbol Parameter Conditions (Note 7) Limits LM613C Units
(Note 8) Limits
(Note 8)
I
S
Total Supply Current R
LOAD
=∞, 450 940 1000 µA (Max)
4V ≤V
+
≤36V (32V for LM613C) 550 1000 1070 µA (Max)
V
S
Supply Voltage Range 2.2 2.8 2.8 V (Min)
2.9 3 3 V (Min)
46 36 32 V (Max)
43 36 32 V (Max)
OPERATIONAL AMPLIFIERS
V
OS1
V
OS
Over Supply 4V ≤V
+
≤36V 1.5 3.5 5.0 mV (Max)
(4V ≤V
+
≤32V for LM613C) 2.0 6.0 7.0 mV (Max)
V
OS2
V
OS
Over V
CM
V
CM
= 0V through V
CM
= 1.0 3.5 5.0 mV (Max)
(V
+
− 1.8V), V
+
= 30V, V
−
=0V 1.5 6.0 7.0 mV (Max)
Average V
OS
Drift (Note 8) 15 µV/˚C
(Max)
I
B
Input Bias Current 10 25 35 nA (Max)
11 30 40 nA (Max)
I
OS
Input Offset Current 0.2 4 4 nA (Max)
0.3 5 5 nA (Max)
Average Offset Current
4pA/˚C
R
IN
Input Resistance Differential 1000 MΩ
C
IN
Input Capacitance Common-Mode 6 pF
e
n
Voltage Noise f = 100 Hz, Input Referred 74
I
n
Current Noise f = 100 Hz, Input Referred 58
CMRR Common-Mode V
+
= 30V, 0V ≤V
CM
≤(V
+
− 1.8V) 95 80 75 dB (Min)
Rejection Ratio CMRR = 20 log (∆V
CM
/∆V
OS
)90 75 70 dB (Min)
LM613
www.national.com 2
Electrical Characteristics (Continued)
These specifications apply for V
−
= GND = 0V, V
+
= 5V, V
CM
=V
OUT
= 2.5V, I
R
= 100 µA, FEEDBACK pin shorted to GND,
unless otherwise specified. Limits in standard typeface are for T
J
= 25˚C; limits in boldface type apply over the Operating
Temperature Range.
LM613AM LM613M
Typical LM613AI LM613I
Symbol Parameter Conditions (Note 7) Limits LM613C Units
(Note 8) Limits
(Note 8)
OPERATIONAL AMPLIFIERS
PSRR Power Supply 4V ≤V
+
≤30V, V
CM
=V
+
/2, 110 80 75 dB (Min)
Rejection Ratio PSRR = 20 log (∆V
+
/V
OS
)100 75 70 dB (Min)
A
V
Open Loop R
L
=10kΩto GND, V
+
= 30V, 500 100 94 V/mV
Voltage Gain 5V ≤V
OUT
≤25V 50 40 40 (Min)
SR Slew Rate V
+
= 30V (Note 9) 0.70 0.55 0.50 V/µs
0.65 0.45 0.45
GBW Gain Bandwidth C
L
= 50 pF 0.8 MHz
0.5 MHz
V
O1
Output Voltage R
L
=10kΩto GND, V
+
− 1.4 V
+
− 1.7 V
+
− 1.8 V (Min)
Swing High V
+
= 36V (32V for LM613C) V
+
− 1.6 V
+
− 1.9 V
+
− 1.9 V (Min)
V
O2
Output Voltage R
L
=10kΩto V
+
,V
−
+ 0.8 V
−
+ 0.9 V
−
+ 0.95 V (Max)
Swing Low V
+
= 36V (32V for LM613C) V
−
+ 0.9 V
−
+ 1.0 V
−
+ 1.0 V (Max)
I
OUT
Output Source Current V
OUT
= 2.5V, V
+IN
= 0V, 25 20 16 mA (Min)
V
−IN
= −0.3V 15 13 13 mA (Min)
I
SINK
Output Sink Current V
OUT
= 1.6V, V
+IN
= 0V, 17 14 13 mA (Min)
V
−IN
= 0.3V 98 8mA (Min)
I
SHORT
Short Circuit Current V
OUT
= 0V,V
+IN
= 3V, 30 50 50 mA (Max)
V
−IN
=2V 40 60 60 mA (Max)
V
OUT
= 5V, V
+IN
= 2V, 30 60 70 mA (Max)
V
−IN
=3V 32 80 90 mA (Max)
COMPARATORS
V
OS
Offset Voltage 4V ≤V
+
≤36V (32V for LM613C), 1.0 3.0 5.0 mV (Max)
R
L
=15kΩ2.0 6.0 7.0 mV (Max)
Offset Voltage 0V ≤V
CM
≤36V 1.0 3.0 5.0 mV (Max)
over V
CM
V
+
= 36V, (32V for LM613C) 1.5 6.0 7.0 mV (Max)
Average Offset 15 µV/˚C
Voltage Drift (Max)
I
B
Input Bias Current 5 25 35 nA (Max)
830 40nA (Max)
I
OS
Input Offset Current 0.2 4 4 nA (Max)
0.3 5 5 nA (Max)
A
V
Voltage Gain R
L
=10kΩto 36V (32V for
LM613C)
500 V/mV
2V ≤V
OUT
≤27V 100 V/mV
t
r
Large Signal V
+IN
= 1.4V, V
−IN
= TTL Swing, 1.5 µs
Response Time R
L
= 5.1 kΩ2.0 µs
I
SINK
Output Sink Current V
+IN
= 0V, V
−IN
= 1V, 20 10 10 mA (Min)
V
OUT
= 1.5V 13 8 8 mA (Min)
V
OUT
= 0.4V 2.8 1.0 0.8 mA (Min)
2.4 0.5 0.5 mA (Min)
LM613
www.national.com3
Electrical Characteristics (Continued)
These specifications apply for V
−
= GND = 0V, V
+
= 5V, V
CM
=V
OUT
= 2.5V, I
R
= 100 µA, FEEDBACK pin shorted to GND,
unless otherwise specified. Limits in standard typeface are for T
J
= 25˚C; limits in boldface type apply over the Operating
Temperature Range.
LM613AM LM613M
Typical LM613AI LM613I
Symbol Parameter Conditions (Note 7) Limits LM613C Units
(Note 8) Limits
(Note 8)
COMPARATORS
I
LEAK
Output Leakage V
+IN
= 1V, V
−IN
= 0V, 0.1 10 10 µA (Max)
Current V
OUT
= 36V (32V for LM613C) 0.2 µA (Max)
VOLTAGE REFERENCE
V
R
Voltage Reference (Note 10) 1.244 1.2365 1.2191 V (Min)
1.2515 1.2689 V (Max)
(±0.6%) (±2%)
Average Temp. Drift (Note 11) 10 80 150 ppm/˚C
(Max)
Hysteresis (Note 12) 3.2 µV/˚C
V
R
Change V
R(100 µA)
−V
R(17 µA)
0.05 1 1 mV (Max)
with Current 0.1 1.1 1.1 mV (Max)
V
R(10 mA)
−V
R(100 µA)
1.5 5 5 mV (Max)
(Note 13) 2.0 5.5 5.5 mV (Max)
R Resistance ∆V
R(10→0.1 mA)
/9.9 mA 0.2 0.56 0.56 Ω(Max)
∆V
R(100→17 µA)
/83 µA 0.6 13 13 Ω(Max)
V
R
Change V
R(Vro = Vr)
−V
R(Vro = 6.3V)
2.5 7 7 mV (Max)
with High V
RO
(5.06V between Anode and 2.8 10 10 mV (Max)
FEEDBACK)
V
R
Change with V
R(V+ = 5V)
−V
R(V+ = 36V)
0.1 1.2 1.2 mV (Max)
V
ANODE
Change (V
+
= 32V for LM613C) 0.1 1.3 1.3 mV (Max)
V
R(V+ = 5V)
−V
R(V+ = 3V)
0.01 1 1 mV (Max)
0.01 1.5 1.5 mV (Max)
I
FB
FEEDBACK Bias V
ANODE
≤V
FB
≤5.06V 22 35 50 nA (Max)
Current 29 40 55 nA (Max)
e
n
V
R
Noise 10 Hz to 10 kHz, 30 µV
RMS
V
RO
=V
R
LM613
www.national.com 4
Electrical Characteristics (Continued)
Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the
device beyond its rated operating conditions.
Note 2: Input voltage above V+is allowed. As long as one input pin voltage remains inside the common-mode range, the comparator will deliver the correct output.
Note 3: More accurately, it is excessive current flow, with resulting excess heating, that limits the voltages on all pins. When any pin is pulled a diode drop below
V−, a parasitic NPN transistor turns ON. No latch-up will occur as long as the current through that pin remains below the Maximum Rating. Operation is undefined
and unpredictable when any parasitic diode or transistor is conducting.
Note 4: Simultaneous short-circuit of multiple comparators while using high supply voltages may force junction temperature above maximum, and thus should not
be continuous.
Note 5: Junction temperature may be calculated using TJ=T
A+P
DθJA. The given thermal resistance is worst-case for packages in sockets in still air. For packages
soldered to copper-clad board with dissipation from one comparator or reference output transistor, nominal θJA is 90˚C/W for the N package, and 135˚C/W for the
WM package.
Note 6: Human body model, 100 pF discharged through a 1.5 kΩresistor.
Note 7: Typical values in standard typeface are for TJ= 25˚C; values in bold face type apply for the full operating temperature range. These values represent the
most likely parametric norm.
Note 8: All limits are guaranteed at room temperature (standard type face) or at operating temperature extremes (bold type face).
Note 9: Slew rate is measured with the op amp in a voltage follower configuration. For rising slew rate, the input voltage is driven from 5V to 25V, and the output
voltage transition is sampled at 10V and @20V. For falling slew rate, the input voltage is driven from 25V to 5V, and the output voltage transition is sampled at 20V
and 10V.
Note 10: VRis the Cathode-to-feedback voltage, nominally 1.244V.
Note 11: Average reference drift is calculated from the measurement of the reference voltage at 25˚C and at the temperature extremes. The drift, in ppm/˚C, is
106•∆VR/(VR[25˚C]•∆TJ), where ∆VRis the lowest value subtracted from the highest, VR[25˚C] is the value at 25˚C, and ∆TJis the temperature range. This parameter
is guaranteed by design and sample testing.
Note 12: Hysteresis is the change in VRcaused by a change in TJ, after the reference has been “dehysterized”. To dehysterize the reference; that is minimize the
hysteresis to the typical value, its junction temperature should be cycled in the following pattern, spiraling in toward 25˚C: 25˚C, 85˚C, −40˚C, 70˚C, 0˚C, 25˚C.
Note 13: Low contact resistance is required for accurate measurement.
LM613
www.national.com5
Simplified Schematic Diagrams
Op Amp
00922602
Comparator
00922603
Reference/Bias
00922604
LM613
www.national.com 6
Typical Performance Characteristics (Reference)
T
J
= 25˚C, FEEDBACK pin shorted to V
−
= 0V, unless
otherwise noted
Reference Voltage vs Temp. Reference Voltage Drift
00922649 00922650
Accelerated Reference
Voltage Drift vs Time
Reference Voltage vs
Current and Temperature
00922651 00922652
Reference Voltage vs
Current and Temperature
Reference Voltage vs
Reference Current
00922653 00922654
LM613
www.national.com7
Typical Performance Characteristics (Reference) T
J
= 25˚C, FEEDBACK pin shorted to V
−
=
0V, unless otherwise noted (Continued)
Reference Voltage vs
Reference Current
Reference AC
Stability Range
00922655 00922656
FEEDBACK Current vs
FEEDBACK-to-Anode Voltage
FEEDBACK Current vs
FEEDBACK-to-Anode Voltage
00922657 00922658
Reference Noise Voltage
vs Frequency
Reference Small-Signal
Resistance vs Frequency
00922659 00922660
LM613
www.national.com 8
Typical Performance Characteristics (Reference) T
J
= 25˚C, FEEDBACK pin shorted to V
−
=
0V, unless otherwise noted (Continued)
Reference Power-Up Time
Reference Voltage with
FEEDBACK Voltage Step
00922661 00922662
Reference Voltage with
100 ∼12 µA Current Step
Reference Step Response
for 100 µA ∼10 mA
Current Step
00922663 00922664
Reference Voltage Change
with Supply Voltage Step
Reference Change vs
Common-Mode Voltage
00922665
00922666
LM613
www.national.com9
Typical Performance Characteristics (Op Amps)
V
+
= 5V, V
−
= GND = 0V, V
CM
=V
+
/2, V
OUT
=V
+
/2, T
J
=
25˚C, unless otherwise noted
Input Common-Mode
Voltage Range vs
Temperature
V
OS
vs Junction
Temperature
00922667 00922668
Input Bias Current vs
Common-Mode Voltage
Large-Signal
Step Response
00922669 00922670
Output Voltage Swing
vs Temp. and Current
Output Source Current vs
Output Voltage and Temp.
00922671 00922672
LM613
www.national.com 10
Typical Performance Characteristics (Op Amps) V
+
= 5V, V
−
= GND = 0V, V
CM
=V
+
/2, V
OUT
=V
+
/2, T
J
= 25˚C, unless otherwise noted (Continued)
Output Sink Current vs
Output Voltage
Output Swing,
Large Signal
00922673 00922674
Output Impedance vs
Frequency and Gain
Small Signal Pulse
Response vs Temp.
00922675 00922676
Small-Signal Pulse
Response vs Load
Op Amp Voltage Noise
vs Frequency
00922677 00922678
LM613
www.national.com11
Typical Performance Characteristics (Op Amps) V
+
= 5V, V
−
= GND = 0V, V
CM
=V
+
/2, V
OUT
=V
+
/2, T
J
= 25˚C, unless otherwise noted (Continued)
Op Amp Current Noise
vs Frequency
Small-Signal Voltage Gain vs
Frequency and Temperature
00922679 00922680
Small-Signal Voltage Gain
vs Frequency and Load
Follower Small-Signal
Frequency Response
00922681 00922682
Common-Mode Input
Voltage Rejection Ratio
Power Supply Current
vs Power Supply Voltage
00922683 00922684
LM613
www.national.com 12
Typical Performance Characteristics (Op Amps) V
+
= 5V, V
−
= GND = 0V, V
CM
=V
+
/2, V
OUT
=V
+
/2, T
J
= 25˚C, unless otherwise noted (Continued)
Positive Power Supply
Voltage Rejection Ratio
Negative Power Supply
Voltage Rejection Ratio
00922685 00922686
Slew Rate vs Temperature
Input Offset Current vs
Junction Temperature
00922687 00922688
Input Bias Current vs
Junction Temperature
00922689
LM613
www.national.com13
Typical Performance Characteristics (Comparators)
Output Sink Current
Input Bias Current vs
Common-Mode Voltage
00922610 00922611
Comparator
Response Times — Inverting
Input, Positive Transition
Comparator
Response Times — Inverting
Input, Negative Transition
00922612 00922613
LM613
www.national.com 14
Typical Performance Characteristics (Comparators) (Continued)
Comparator
Response Times — Non-Inverting
Input, Positive Transition
Comparator
Response Times — Non-Inverting
Input, Negative Transition
00922614 00922615
Comparator
Response Times — Inverting
Input, Positive Transition
Comparator
Response Times — Inverting
Input, Negative Transition
00922616 00922617
LM613
www.national.com15
Typical Performance Characteristics (Comparators) (Continued)
Comparator
Response Times — Non-Inverting
Input, Positive Transition
Comparator
Response Times — Non-Inverting
Input, Negative Transition
00922618 00922619
Typical Performance Distributions
Average V
OS
Drift
Military Temperature Range
Average V
OS
Drift
Industrial Temperature Range
00922620 00922621
LM613
www.national.com 16
Typical Performance Distributions (Continued)
Average V
OS
Drift
Commercial Temperature Range
Average I
OS
Drift
Military Temperature Range
00922622 00922623
Average I
OS
Drift
Industrial Temperature Range
Op Amp Voltage
Noise Distribution
00922624 00922627
LM613
www.national.com17
Typical Performance Distributions (Continued)
Average I
OS
Drift
Commercial Temperature Range
Op Amp Current
Noise Distribution
00922625 00922628
Voltage Reference Broad-Band
Noise Distribution
00922626
Application Information
VOLTAGE REFERENCE
Reference Biasing
The voltage reference is of a shunt regulator topology that
models as a simple zener diode. With current I
r
flowing in the
“forward” direction there is the familiar diode transfer func-
tion. I
r
flowing in the reverse direction forces the reference
voltage to be developed from cathode to anode. The cath-
ode may swing from a diode drop below V
−
to the reference
voltage or to the avalanche voltage of the parallel protection
diode, nominally 7V. A 6.3V reference with V
+
=3Visal-
lowed.
The reference equivalent circuit reveals how V
r
is held at the
constant 1.2V by feedback, and how the FEEDBACK pin
passes little current.
To generate the required reverse current, typically a resistor
is connected from a supply voltage higher than the reference
voltage. Varying that voltage, and so varying I
r
, has small
effect with the equivalent series resistance of less than an
ohm at the higher currents. Alternatively, an active current
source, such as the LM134 series, may generate I
r
.
00922629
FIGURE 1. Voltage Associated with Reference
(current source I
r
is external)
00922630
FIGURE 2. Reference Equivalent Circuit
LM613
www.national.com 18
Application Information (Continued)
Capacitors in parallel with the reference are allowed. See the
Reference AC Stability Range typical curve for capacitance
values —from 20 µA to 3 mA any capacitor value is stable.
With the reference’s wide stability range with resistive and
capacitive loads, a wide range of RC filter values will perform
noise filtering.
Adjustable Reference
The FEEDBACK pin allows the reference output voltage,
V
ro
, to vary from 1.24V to 6.3V. The reference attempts to
hold V
r
at 1.24V. If V
r
is above 1.24V, the reference will
conduct current from Cathode to Anode; FEEDBACK current
always remains low. If FEEDBACK is connected to Anode,
then V
ro
=V
r
= 1.24V. For higher voltages FEEDBACK is
held at a constant voltage above Anode — say 3.76V for V
ro
= 5V. Connecting a resistor across the constant V
r
generates
a current I=R1/V
r
flowing from Cathode into FEEDBACK
node. A Thevenin equivalent 3.76V is generated from FEED-
BACK to Anode with R2=3.76/I. Keep I greater than one
thousand times larger than FEEDBACK bias current for
<0.1% error — I≥32 µA for the military grade over the military
temperature range (I≥5.5 µA for a 1% untrimmed error for a
commercial part).
Understanding that V
r
is fixed and that voltage sources,
resistors, and capacitors may be tied to the FEEDBACK pin,
a range of V
r
temperature coefficients may be synthesized.
00922631
FIGURE 3. 1.2V Reference
00922632
FIGURE 4. Thevenin Equivalent of Reference
with 5V Output
00922633
R1 = Vr/I = 1.24/32µ = 39k
R2 = R1 {(Vro/Vr) − 1} = 39k {(5/1.24) − 1)} = 118k
FIGURE 5. Resistors R1 and R2 Program Reference
Output Voltage to be 5V
00922634
FIGURE 6. Output Voltage has Negative Temperature
Coefficient (TC) if R2 has Negative TC
00922635
FIGURE 7. Output Voltage has Positive TC
if R1 has Negative TC
LM613
www.national.com19
Application Information (Continued)
Connecting a resistor across Cathode-to-FEEDBACK cre-
ates a 0 TC current source, but a range of TCs may be
synthesized.
Reference Hysteresis
The reference voltage depends, slightly, on the thermal his-
tory of the die. Competitive micro-power products vary —
always check the data sheet for any given device. Do not
assume that no specification means no hysteresis.
OPERATIONAL AMPLIFIERS AND COMPARATORS
Any amp, comparator, or the reference may be biased in any
way with no effect on the other sections of the LM613,
except when a substrate diode conducts, see Electrical
Characteristics (Note 1). For example, one amp input may
be outside the common-mode range, another amp may be
operating as a comparator, and all other sections may have
all terminals floating with no effect on the others. Tying
inverting input to output and non-inverting input to V
−
on
unused amps is preferred. Unused comparators should have
non-inverting input and output tied to V
+
, and inverting input
tied to V
−
. Choosing operating points that cause oscillation,
such as driving too large a capacitive load, is best avoided.
Op Amp Output Stage
These op amps, like the LM124 series, have flexible and
relatively wide-swing output stages. There are simple rules
to optimize output swing, reduce cross-over distortion, and
optimize capacitive drive capability:
1. Output Swing: Unloaded, the 42 µA pull-down will bring
the output within 300 mV of V
−
over the military tempera-
ture range. If more than 42 µA is required, a resistor from
output to V
−
will help. Swing across any load may be
improved slightly if the load can be tied to V
+
, at the cost
of poorer sinking open-loop voltage gain.
2. Cross-Over Distortion: The LM613 has lower cross-over
distortion (a 1 V
BE
deadband versus 3 V
BE
for the
LM124), and increased slew rate as shown in the char-
acteristic curves. A resistor pull-up or pull-down will force
class-A operation with only the PNP or NPN output
transistor conducting, eliminating cross-over distortion.
3. Capacitive Drive: Limited by the output pole caused by
the output resistance driving capacitive loads, a pull-
down resistor conducting 1 mA or more reduces the
output stage NPN r
e
until the output resistance is that of
the current limit 25Ω. 200 pF may then be driven without
oscillation.
00922636
FIGURE 8. Diode in Series with R1 Causes Voltage
Across R1 and R2 to be Proportional to Absolute
Temperature (PTAT)
00922637
I = Vr/R1 = 1.24/R1
FIGURE 9. Current Source is Programmed by R1
00922638
FIGURE 10. Proportional-to-Absolute-Temperature
Current Source
00922639
FIGURE 11. Negative-TC Current Source
LM613
www.national.com 20
Application Information (Continued)
Comparator Output Stage
The comparators, like the LM139 series, have open-collector
output stages. A pull-up resistor must be added from each
output pin to a positive voltage for the output transistor to
switch properly. When the output transistor is OFF, the out-
put voltage will be this external positive voltage.
For the output voltage to be under the TTL-low voltage
threshold when the output transistor is ON, the output cur-
rent must be less than 8 mA (over temperature). This im-
pacts the minimum value of pull-up resistor.
The offset voltage may increase when the output voltage is
low and the output current is less than 30 µA. Thus, for best
accuracy, the pull-up resistor value should be low enough to
allow the output transistor to sink more than 30 µA.
Op Amp and Comparator Input Stage
The lateral PNP input transistors, unlike those of most op
amps, have BV
EBO
equal to the absolute maximum supply
voltage. Also, they have no diode clamps to the positive
supply nor across the inputs. These features make the in-
puts look like high impedances to input sources producing
large differential and common-mode voltages.
LM613
www.national.com21
Typical Applications
00922640
FIGURE 12. High Current, High Voltage Switch
00922641
FIGURE 13. High Speed Level Shifter. Response time is approximately
1.5 µs, where output is either approximately +V or −V.
00922643
*10k must be low
t.c. trimpot
FIGURE 14. Ultra Low Noise, 10.00V Reference. Total output noise is typically 14 µV
RMS
.
LM613
www.national.com 22
Typical Applications (Continued)
Ordering Information
Reference
Tolerance & V
OS
Temperature Range
Package NSC
Drawing
Military Industrial
−55˚C ≤T
A
≤+125˚C −40˚C ≤T
A
≤+85˚C
±0.6%
80 ppm/˚C Max.
V
OS
≤3.5 mV
LM613AMJ/883 (Note 14) 16-Pin
Ceramic DIP
J16A
±2.0%
150 ppm/˚C Max.
V
OS
≤5.0 mV Max.
LM613IWM
LM613IWMX
16-Pin Wide
Surface Mount
M16B
Note 14: A military RETS 613AMX electrical test specification is available on request. The Military screened parts can also be procured as a Standard Military
Drawing.
00922644
FIGURE 15. Basic Comparator
00922645
FIGURE 16. Basic Comparator with External Strobe
00922646
FIGURE 17. Wide-Input Range
Comparator with TTL Output
00922647
FIGURE 18. Comparator with
Hysteresis (∆V
H
=
+
V(1k/1M))
LM613
www.national.com23
Physical Dimensions inches (millimeters)
unless otherwise noted
16-Lead Ceramic Dual-In-Line Package (J)
Order Number LM613AMJ/883
NS Package Number J16A
16-Lead Small Outline Package (WM)
Order Number LM613IWM or LM613IWMX
NS Package Number M16B
LM613
www.national.com 24
Notes
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
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
Français 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
www.national.com
LM613 Dual Operational Amplifiers, Dual Comparators, and Adjustable Reference
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.
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements,
and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should
obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are
sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard
warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where
mandated by government requirements, testing of all parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and
applications using TI components. To minimize the risks associated with customer products and applications, customers should provide
adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right,
or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information
published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a
warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual
property of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied
by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive
business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional
restrictions.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all
express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not
responsible or liable for any such statements.
TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would reasonably
be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing
such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products
and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be
provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in
such safety-critical applications.
TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are
specifically designated by TI as military-grade or "enhanced plastic."Only products designated by TI as military-grade meet military
specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at
the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use.
TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are
designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated
products in automotive applications, TI will not be responsible for any failure to meet such requirements.
Following are URLs where you can obtain information on other Texas Instruments products and application solutions:
Products Applications
Audio www.ti.com/audio Communications and Telecom www.ti.com/communications
Amplifiers amplifier.ti.com Computers and Peripherals www.ti.com/computers
Data Converters dataconverter.ti.com Consumer Electronics www.ti.com/consumer-apps
DLP®Products www.dlp.com Energy and Lighting www.ti.com/energy
DSP dsp.ti.com Industrial www.ti.com/industrial
Clocks and Timers www.ti.com/clocks Medical www.ti.com/medical
Interface interface.ti.com Security www.ti.com/security
Logic logic.ti.com Space, Avionics and Defense www.ti.com/space-avionics-defense
Power Mgmt power.ti.com Transportation and Automotive www.ti.com/automotive
Microcontrollers microcontroller.ti.com Video and Imaging www.ti.com/video
RFID www.ti-rfid.com
OMAP Mobile Processors www.ti.com/omap
Wireless Connectivity www.ti.com/wirelessconnectivity
TI E2E Community Home Page e2e.ti.com
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright ©2011, Texas Instruments Incorporated
