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National Semiconductor
National Semiconductor

LM299A Datasheet

Precision Reference


LM299A Datasheet Preview


~National
~ Semiconductor
Voltage References
and Regulators
LM199A1LM299A1LM399A Precision Reference
General Description
The LM 199A/LM299A/LM399A are precision, tempera-
ture-stabilized monolithic zeners offering temperature
coefficients a factor of ten better than high qual ity
'reference zeners, Constructed on a single monolithic
chip is a temperature stabilizer circuit and an active
reference zener, The active circuitry reduces the dynamic
impedance of the zener to about 0.5S1 and allows the
zener to operate over 0.5 mA to 10 mA current range
with essentially no change in voltage or temperature
coefficient. Further, a new subsurface zener structure
gives low noise and excellent long term stability com-
pared to ordinary monolithic zeners. The package is
supplied with a thermal shield to minimize heater power
and improve temperature regulation.
The LM 199A series references are exceptionally easy to
use and free of the problems that are often experienced
with ordinary zeners. There is virtually no hysteresis in
reference voltage with temperature cycling. Also, the
LM199A is free of voltage shifts due to stress on the
leads. Finally, since the unit is temperature stabilized,
warm up time is fast.
The LM199A can De used in almost any application in
place of ordinary zeners with improved pe~formance.
Some ideal applications are analog to digital converters,
calibration standards, precision voltage or current sources
or precision power supplies. Further in many cases the
LM 199A can replace references in existing equipment
with a minimum of wiring changes.
The LM 199A series devices are packaged in a standard
hermetic TO-46 package inside a thermal shield. The
LM199 is rated for operation from -55°C to +125°C
while the LM299A is rated for operation from -25°C
to +85°C and the LM399A is rated from O°C to +70°C.
Features
• Guaranteed 0.00005%tC temperature coefficient
• Low dynamic impedance - 0.5S1
• Initial tolerance on breakdown voltage - 2%
• Sharp breakdown at 400pA
• Wide operating current - 500pA to 10 mA
• Wide supply range for temperature stabilizer
• Guaranteed low noise
• Low power for stabilization - 300 mW at 25°C
• Long term stability - 20 ppm
Schematic Diagrams
03
63v
0'
30pf
42
Temperature Stabilizer
Connection Diagram
Metal Can Package
~~
Order Number
LM199AH
LM299AH
LM399AH
See Package H04D
TOPVIEW
'Reference
Functional Block Diagram
Mr-. --- ""1
IH
I
II
LI ____ -lI
42
7-23
Page 1

Absolute Maximum Ratings
Temperature Stabilizer Voltage
Reverse Breakdown Current
Forward Current
Reference to Substrate Voltage V(AS) (Note 1)
Operating Temperature Range
LM199A
LM299A
LM399A
Storage Temperature Range
Lead Temperature (Soldering, 10 seconds)
40V
20mA
1 mA
+40V
-D.1V
-55°C to +125°C
-25°C to +85°C
O°C to +70°C
-55°C to +150°C
300°C
Electrical Characteristics (Note 2)
PARAMETER
CONDITIONS
LM199A, LM299A
MIN TYP
MAX
MIN
LM399A
TYP
MAX
Reverse Breakdown Voltage
Reverse Breakdown Voltage
Change With Current
0.5 mA::; I R ::; 10 mA
0.5 mA ::; I R ::; 10 mA
6.8 6.95
6
7.1
9
6.6 6.95
6"
7.3
12
Reverse Dynamic Impedance IR = 1 mA
0.5 0.5 1.5
Reverse Breakdown
Temperature Coefficient
-55°C<TA <85°C} " LM199A
85°C::; T A ::; 125°C
~25°C ::; TA ::; 85°C
O°C ::; TA ::; 70°C
LM299A
LM399A
0.00002
0.0005
0.00002
0.00005
0.0010
0.00005
0.00003 0.0001
RMS Noise
10 Hz ::; f ::; 10kHz
7 20
7 50
Long Term Stability
Stabilized, 22°C::; T A ::; 28°C,
1000 Hours, I R = 1 mA ±0.1 %
20
20
Temperature Stabilizer
Supply Current
TA = 25°C, Still Air, Vs = 30V
TA = -55°C
8.5 14
22 28
8.5 15
Temperature Stabilizer
Supply Voltage (Note 3)
9 40 9 40
Warm·Up Time to 0.05%
Vs = 30V, TA = 25°C
3
3
Initial Turn-on Current
9::; Vs ::; 40, T A = 25°C
140 200
140 200
UNITS
V
mV
.Q
%/oC
%fC
%fC
%/oC
IlV
ppm
mA
V
Seconds
mA
Note 1: The substrate is electrically connected to the negative terminal of the temperature stabilizer. The voltage that can be applied to either
terminal of the reference is 40V more positive or 0.1 V more negative than the substrate_
Note 2: These specifications apply for 30V applied to the temperature stabilizer and -55"C::; TA::; +125°C for the LM199A; -25°C::; TA::;
+85°C for the LM299A and O°C::; TA::; +70°C for ·the LM399A_
Note 3: CAUTION. If the device is operated for more than 60 seconds with heater supply voltage between 2V and 9V the heater temperature
control circuitry is not properly biased and the device can rise to approximately +150° C.
7-24
Page 2

Typical Performance Characteristics
Reverse Characteristics
Reverse Voltage Change
~... 10->
z
aa::
::>
10-3
u
V)
a:
:>
a:
10-·
~t:::: ~
~;t1.ABILIZED
V I(T, "9~ C)
6.45 6.65 6.B5
REVERSE VOLTAGE (V)
7.05
V)
a:
:>
a:
REVERSE CURRENT (mA)
10
Dynamic Impedance
loa
-....
uz 10
~
~
u
~1.0
II
/J
STABILlZE~
(Tj - 90"C)
./ /
/'4: 25'C=
, --==
0.1 1...-_-1.._ _.l.....-_-...l._ _...J
10 100 11
10k lOOk
FREQUENCY (Hz)
Zener Noise Voltage
200
1\~i 150 1\
...(
~
~V)
~ 100
-STABILIZED (Tj ,,90 C) _
T, =125 C
50
10
100 lk 10k
FREQUENCY (Hz)
lOOk
Stabilization Time
I
TA : 25 C
--
-'~A =J5 C
I:;
.,.g.
-1
I
::>
I "...::> -2
I0
I
-3
-4
o
! iI VH 15V
12 16
HEATER ON TIME - (SEC)
20
Heater Current
-55 -35 -15 5 25 45 65 85 105
TEMPE RATURE ('C)
Initial Heater Current
250
4dv1
VH =
;;(
,.g..
z
200
f'.. r-.....
a:
a:
150
::>
u
...a:
100
""" j'-...I.......
f'.
~
;;: 50
;::
~ '-r-
-55 -35 -15 5 25 45 65 85 105 125
TURN ON TEMPERATURE ('C)
Heater Current
160
TA =25 C
140
...;;(
,g
120
z 100
aa:: 80
::>
u
.a.:. 60
~ 40
20
~t--...l' yVH ='lIiJ-t-
\ -l\
"
VI VH
~I\-1Y''l\:r=:::VH
:
~
20V
30V
40
-t-
V-t-
~
o 2 4 6 8 10 12 14 16 18
TIME (SEC)
Response Time
to
~
:>
1100
t=j=:=t:;:~~~
INPUT
0~--4---+---+----+--
100 200 300 400
TIME (",)
Low Frequency Noise Voltage
0.01 Hz '.' f -: 1 Hz
STABILizED
(T; - 90 C)
TIME (MINUTES)
10
7-25
Page 3
Part Number LM299A
Manufactur National Semiconductor
Description Precision Reference
Total Page 6 Pages
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