NSC LM369DRC, LM369DN, LM369DMX, LM369DM Datasheet
LM169/LM369 Precision Voltage Reference
LM169/LM369 Precision Voltage Reference
December 1994
General Description
The LM169/LM369 are precision monolithic temperaturecompensated voltage references. They are based on a buried zener reference as pioneered in the LM199 references,
but do not require any heater, as they rely on special temperature-compensation techniques (Patent Pending). The
LM169 makes use of thin-film technology enhanced by the
discrete laser trimming of resistors to achieve excellent
Temperature coefficient (Tempco) of V
ppm/
C), along with tight initial tolerances (as low as 0.05%
§
max). The trim scheme is such that individual resistors are
(as low as 1
out
cut open rather than being trimmed (partially cut), to avoid
resistor drift caused by electromigration in the trimmed area.
The LM169 also provides excellent stability vs. changes in
input voltage and output current (both sourcing and sinking).
The devices have a 10.000V output and will operate in either series or shunt mode; the output is short-circuit-proof to
ground. A trim pin is available which permits fine-trimming of
V
, and also permits filtering to greatly decrease the out-
out
put noise by adding a small capacitor (0.05 to 0.5 mF).
Connection Diagrams
Metal Can Package (H)
Features
Y
Low Tempco 3 ppm/§C (max)
Y
Excellent initial accuracy
Y
Excellent line regulation 4 ppm/V (max)
Y
Excellent output impedance
Y
Excellent thermal regulationg20 ppm/100 mW (max)
Y
Low noise
Y
Easy to filter output noise
Y
Operates in series or shunt mode
g
5 mV (max)
g
0.8X (max)
Applications
Y
High-Resolution Data Acquisition Systems
Y
Digital volt meters
Y
Weighing systems
Y
Precision current sources
Y
Test Equipment
Dual-In-Line Package (N)
or S.O. Package (M)
Top View
TL/H/9110– 5
Order Number LM369DM, LM369DMX,** LM369N,
LM369BN, LM369CN or LM369DN
Top View
TL/H/9110– 1
(Case is connected to ground.)
*Do not connect; internal connection for factory trims.
See NS Package Number M08A or N08E
**X denotes 2500 units on Tape and Reel and is not included in the device
part number marking
TO-226 Plastic Package (RC)
Order Number LM169H, LM169BH,
LM169H/883, LM369H or LM369BH
See NS Package Number H08C
Bottom View
TL/H/9110– 28
Order Number LM369DRC
See NS Package Number RC03A
TeflonÉand MylarÉare registered trademarks of E.I. DuPont Corp.
C
1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.
TL/H/9110
Absolute Maximum Ratings (Note 8)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Input Voltage (Series Mode) 35V
Reverse Current (Shunt Mode) 50 mA
Power Dissipation (Note 7) 600 mW
Storage Temperature Range
Operating Temperature Range (Tjmin to Tjmax)
LM169H, LM169H/883
LM369 0
b
60§Ctoa150§C
b
55§Ctoa125§C
Ctoa70§C
§
Soldering Information
DIP (N) or Plastic (RC) Package, 10 sec.
H08 (H) Package, 10 sec.
SO (M) Package, Vapor Phase (60 sec.)
Infrared (15 sec.)
a
a
a
a
See AN-450 ‘‘Surface Mounting Methods and Their Effect
on Product Reliability’’ (Appendix D) for other methods of
soldering surface mount devices.
ESD Tolerance
e
C
100 pF, R
zap
e
1.5k 800V
zap
Electrical Characteristics, LM169, LM369 (Note 1)
Parameter Conditions Typical Limits Limit
Tested Design
(Notes 2, 13) (Note 3)
V
Nominal
out
V
Error (Note 11) 50
out
V
Tempco
out
LM169B, LM369B T
LM169, LM369 T
LM369C T
(Note 6) (Note 11)
Line Regulation 13VsV
min
min
min
k
k
T
T
j
max
k
k
T
T
j
max
k
k
T
T
j
max
s
30V 2.0 4.0 8.0 ppm/V
IN
a
10.000 V
g
500 ppm
0.50
g
5mV
1.0 3.0 Ð ppm/§C
2.7 5.0 Ð ppm/§C
6 10 Ð ppm/§C
Load Regulation
Sourcing 0 to 10 mA
Sinking (Note 12) 0 to
b
10 mA
a
3
a
80
g
8.0 20.0 ppm/mA
a
150 ppm/mA
(Note 4, Note 9)
Thermal Regulation (te10 msec
Sourcing After Load 3.0
g
20 Ð ppm/100 mW
Sinking (Note 12) is Applied) 3.0 Ð Ð ppm/100 mW
(Note 5)
Supply Current 1.4 1.8 2.0 mA
DSupply Current 13VsV
s
30V 0.06 0.12 0.2 mA
IN
Short Circuit 27 15 11 mA min
Current 50 65 mA max
Noise Voltage 10 Hz to 1 kHz 10 30 Ð mV rms
0.1 Hz to 10 Hz 4 Ð Ð mV p-p
(10 Hz to 10 kHz, 4 Ð Ð mV rms
e
C
0.1 mF)
filter
Long-term 1000 hours, 6 Ð Ð ppm
a
k
j
25§C)
T
max
Stability T
(Non-Cumulative) (Measured at
(Note 10)
Temperature DTe25§C 3 Ð Ð ppm
Hysteresis of V
out
Output Shift 1500 2600 Ð ppm
per 1 mA at Pin 5
Units
(Max
Unless
Noted)
260§C
300§C
215§C
220§C
2
Electrical Characteristics LM369D (Note 1)
is 160§C/W.
J-A
Units
(Max
Unless
Noted)
Parameter Conditions Typical Limits Limit
Tested Design
(Notes 2, 13) (Note 3)
V
Nominal
out
V
Error, 70
out
LM369D 0.7
s
V
Tempco T
out
(Note 6)
Line Regulation 13VsV
min
s
T
T
j
max
s
30V 2.4
IN
a
10.000 V
g
1000 Ð ppm
g
10.0 Ð mV
5 30 ppm/§C
g
6.0 12 ppm/V
Load Regulation
Sourcing 0 to 10 mA
Sinking (Note 12) 0 to
b
10 mA
a
3
a
80
g
12
a
160 ppm/mA
g
25 ppm/mA
(Note 4, Note 9)
Thermal Regulation (te10 msec
Sourcing After Load 4.0
g
25 Ð ppm/100 mW
Sinking (Note 12) is Applied) 4.0 Ð Ð ppm/100 mW
(Note 5)
Supply Current 1.5 2.0 2.4 mA
DSupply Current 13VsV
s
30V 0.06 0.16 0.3 mA
IN
Short Circuit 27 14 10 mA min
Current 50 65 mA max
Noise Voltage 10 Hz to 1 kHz 10 30 Ð mV rms
0.1 Hz to 10 Hz 4 Ð Ð mV p-p
(10 Hz to 10 kHz, 4 Ð Ð mV rms
e
C
0.1 mF)
filter
Long-Term 1000 Hours, 8 Ð Ð ppm
a
k
j
25§C)
T
max
Stability T
(Non-Cumulative) (Measured at
Temperature DTe25§C 5 Ð Ð ppm
Hysteresis of V
out
Output Shift 1500 2800 Ð ppm
Per 1 mA at Pin 5
Note 1: Unless otherwise noted, these conditions apply: T
TYPE apply over the rated operating temperature range.
Note 2: Tested limits are guaranteed and 100% tested in production.
Note 3: Design Limits are guaranteed (but not 100% production tested) over the indicated temperature and supply voltage ranges. These limits are not to be used
to calculate outgoing quality levels.
Note 4: The LM169 has a Class B output, and will exhibit transients at the crossover point. This point occurs when the device is required to sink approximately 1.0
mA. In some applications it may be advantageous to pre-load the output to either V
Note 5: Thermal regulation is defined as the change in the output voltage at a time T after a step change of power dissipation of 100 mW.
Note 6: Temperature Coefficient of V
Temperature Range (see graphs). There is no guarantee that the Specified Temperatures are exactly at the minimum or maximum deviation.
Note 7: In metal can (H), i
Note 8: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications are not guaranteed beyond
the Rated Operating Conditions.
Note 9: Regulation is measured at constant temperature using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered
under the specifications for Thermal Regulation and Tempco. Load Regulation is measured at a point on the output pin 1/8
Note 10: Consult factory for availability of devices with Guaranteed Long-term Stability.
Note 11: Consult factory for availability of devices with tighter Accuracy and Tempco Specifications.
Note 12: In Sinking mode, connect 0.1 m F tantalum capacitor from output to ground.
Note 13: A military RETS electrical test specification is available on request.
J-C
is defined as the worst-case DV
OUT
is 75§C/W and i
ea
25§C, 13VsV
j
is 150§C/W. In plastic DIP, i
J-A
s
17V, 0sI
in
or to ground, to avoid this crossover point.
in
measured at Specified Temperatures divided by the total span of the Specified
out
is 160§C/W. In S0-8, i
J-A
load
s
1.0 mA, C
is 180§C/W, in TO-226, i
J-A
s
e
200 pF. Specifications in BOLDFACED
L
below the bottom of the package.
×
3
Typical Performance Characteristics (Note 1)
Quiescent Current vs Input
Voltage and Temperature
Dropout Voltage vs
Output Current (Series
Mode Sourcing Current)
Output Change vs
Output Current
Output Impedance
vs Frequency
Output Noise vs Frequency
TL/H/9110– 24
Ripple Rejection
vs Frequency
Output Noise vs Filter
Capacitor
TL/H/9110– 25
LM369 Temperature
Coefficient Specified
Temperatures (see Note 6)
Start-up Response
TL/H/9110– 6
LM169 Temperature
Coefficient Specified
Temperatures (see Note 6)
TL/H/9110– 26
Typical Temperature Coefficient Calculations:
LM169 (see curve above):
e
T.C.
1.6 mV/(180
e
8.9c10
LM369 (see curve at left):
e
T.C.
0.5 mV/(75
e
6.7c10
b
7
b
7
c
§
e
0.89 ppm/§C
c
§
e
0.67 ppm/§C
10V)
10V)
TL/H/9110– 27
4
Application Hints
The LM169/LM369 can be applied in the same way as any
other voltage reference. The adjacent Typical Applications
Circuits suggest various uses for the LM169/LM369. The
LM169 is recommended for applications where the highest
stability and lowest noise is required over the full military
temperature range. The LM369 is suitable for limited-temperature operation. The curves showing the Noise vs. Capacitance in the Typical Performance Characteristics section show graphically that a modest capacitance of 0.1 to
0.3 microfarads can cut the broadband noise down to a level of only a few microvolts, less than 1 ppm of the output
voltage. The capacitor used should be a low-leakage type.
For the temperature range 0 to 50
will be suitable, but at higher temperatures, a premium film
capacitor such as polypropylene is recommended. For oper-
a
ation at
125§C, a TeflonÉcapacitor would be required, to
ensure sufficiently low leakage. Ceramic capacitors may
seem to do the job, but are not recommended for production use, as the high-K ceramics cannot be guaranteed for
low leakage, and may exhibit piezo-electric effects, converting vibration or mechanical stress into excessive electrical
noise.
Additionally, the inherent superiority of the LM169/369’s
buried Zener diode provides freedom from low-frequency
noise, wobble, and jitter, in the frequency range 0.01 to 10
Hertz, where capacitive filtering is not feasible.
Pins 1, 3, 7, and 8 of the LM169/369 are connected to
internal trim circuits which are used to trim the device’s output voltage and Tempco during final testing at the factory.
Do not connect anything to these pins, or improper operation may result. These pins would not be damaged by a
short to ground, or by Electrostatic Discharges; however,
keep them away from large transients or AC signals, as
stray capacitance could couple noises into the output.
These pins may be cut off if desired. Alternatively, a shield
foil can be laid out on the printed circuit board, surrounding
these pins and pin 5, and this guard foil can be connected to
ground or to V
coupling and DC leakages.
, effectively acting as a guard against AC
out
The trim pin (pin 5) should also be guarded away from noise
signals and leakages, as it has a sensitivity of 15 millivolts of
DV
per microampere. The trim pin can also be used in
out
C, polyester or Mylar
§
the circuits shown, to provide an output trim range of
millivolts. Trimming to a wider range is possible, but is not
recommended as it may degrade the Tempco and the
Tempco linearity at temperature extremes. For example, if
the output were trimmed up to 10.240V, the Tempco would
be degraded by 8 ppm/
be degraded by 1 ppm/
C. As a general rule, Tempco will
§
C per 30 mV of output adjustment.
§
The output can sink current as well as source it, but the
output impedance is much better for sourcing current. Also,
the LM169/369 requires a 0.1 mF tantalum capacitor (or,
0.1 mF in series with 10X) bypass from the output to ground,
for stable operation in shunt mode (output sinking current).
É
The output has a class-B stage, so if the load current changes from sourcing to sinking, an output transient will occur.
To avoid this transient, it may be advisable to preload the
output with a few milliamperes of load to ground. The
LM169/369 does have an excellent tolerance of load capacitance, and in cases of load transients, electrolytic or
tantalum capacitors in the range 1 to 500 microfarads have
been shown to improve the output impedance without degrading the dynamic stability of the device. The LM169/369
are rated to drive an output of
cy, any load current larger than 1 mA can cause thermal
errors (such as, 1 mA
g
10 mA, but for best accura-
c5Vc
4 ppm/100 mWe0.2 ppm
or 2 microvolts) and degrade the ultimate precision of the
output voltage.
The output is short-circuit-proof to ground. However, avoid
overloads at high ambient temperatures, as a prolonged
short-circuit may cause the junction temperature to exceed
the Absolute Maximum Temperature. The device does not
include a thermal shut-down circuit. If the output is pulled to
a positive voltage such as
will be limited, but overheating may occur. Avoid such overloads for voltages higher than
a
15 ora20V, the output current
a
20 V, for more than 5 sec-
onds, or, at high ambient temperatures.
The LM169/369 has an excellent long-term stability, and is
suitable for use in high-resolution Digital Voltmeters or Data
Acquisition systems. Its long-term stability is typically 3 to 10
ppm per 1000 hours when held near T
ter when operated at room temperature. Contact the factory
for availability of devices with proven long-term stability.
, and slightly bet-
max
g
10
Typical Applications
Series Reference
TL/H/9110– 2
NOTE: Pin numbers for H, M or N packages.
Shunt Reference with Optional Trim
TL/H/9110– 3
5
Series Reference with
Optional Filter
for Reduced Noise
TL/H/9110– 4
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