LT1031/LH0070
Precision 10V Reference
FEATURES
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DESCRIPTIO
Pin Compatible with LH0070 and AD581*
Ultralow Drift—5ppm/°C Max Slope
Trimmed Output Voltage
Operates in Series or Shunt Mode
Output Sinks and Sources in Series Mode
Very Low Noise < 1ppm
P-P
0.1Hz to 10Hz
> 100dB Ripple Rejection
Minimum Input Voltage of 11V
The LT
®
1031 is a precision 10V reference with ultralow
drift and noise, extremely good long term stability, and
almost total immunity to input voltage variations. The
reference output will both source and sink up to 10mA and
can be used as a shunt regulator (two terminal Zener) with
the same precision characteristics as the three terminal
connection. Special care has been taken to minimize
thermal regulation effects and temperature induced
hysteresis.
The LT1031 reference is based on a buried Zener diode
structure which eliminates noise and stability problems
associated with surface breakdown devices. Further, a
subsurface Zener exhibits better temperature drift and
time stability than even the best band-gap references.
Unique circuit design makes the LT1031 the first three
terminal IC reference to offer ultralow drift without the
use of high power on-chip heaters. Output voltage is
pretrimmed to 0.05% accuracy.
The LT1031 can be used as a plug-in replacement for
the AD581 and LH0070,* with improved electrical and
thermal performance.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*See LH0070 Electrical Characteristics table and AD581 cross reference guide.
APPLICATIO S
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A-to-D and D-to-A Converters
Precision Regulators
Digital Voltmeters
lnertial Navigation Systems
Precision Scales
Portable Reference Standard
TYPICAL APPLICATIO
Basic Positive and
Negative Connections
LT1031
V
IN
IN
GND
OUT
V
OUT
GND
– V
OUT
R1 =
V
IN
– V
OUT
I
LOAD
+ 1.5mA
R1
LT1031
OUT
Distribution of Output Accuracy
T
A
= 25°C
35 DISTRIBUTION
FROM 5 RUNS
PERCENT OF UNITS (%)
30
25
20
15
10
5
40
– V
IN
LT1031 • TA01
0
–0.10 –0.06
U
–0.02 0 0.02
0.06
OUTPUT ACCURACY (%)
0.10
LT1031 TA02
U
U
1031fb
1
LT1031/LH0070
ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
BOTTOM VIEW
INPUT
Input Voltage ........................................................... 40V
Input-Output Voltage Differential ............................. 35V
Output to Ground Voltage
(Shunt Mode Current Limit) ................................. 16V
Trim Pin to Ground Voltage
Positive ................................................. Equal to V
OUT
Negative ............................................................. –20V
Output Short-Circuit Duration
V
IN
= 35V ......................................................... 10 sec
V
IN
≤
20V ..................................................... Indefinite
Operating Temperature Range
LT1031M .......................................... –55°C to 125°C
LT1031C .................................................. 0°C to 70°C
Lead Temperature (Soldering, 10 sec).................. 300°C
1
2
3
GROUND
H PACKAGE
3-LEAD TO-39 METAL CAN
T
JMAX
= 150°C,
θ
JA
= 150°C/W,
θ
JC
= 45°C/W (LH0070)
T
JMAX
= 150°C,
θ
JA
= 150°C/W,
θ
JC
= 45°C/W (LT1031M)
T
JMAX
= 85°C,
θ
JA
= 150°C/W,
θ
JC
= 45°C/W (LT1031C)
OUTPUT
ORDER PART NUMBER
LH0070-0H
LH0070-1H
LH0070-2H
LT1031BMH
LT1031DMH
LT1031BCH
LT1031CCH
LT1031DCH
ELECTRICAL CHARACTERISTICS
SYMBOL
V
R
PARAMETER
Output Voltage (Note 2)
(LT1031) The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 15V, I
OUT
= 0, Mil or Comm version, unless noted.
CONDITIONS
LT1031B
LT1031C
LT1031D
T
MIN
≤
T
J
≤
T
MAX
LT1031B
LT1031C
LT1031D
11.5V
≤
V
IN
≤
14.5V
4.5V
≤
V
IN
≤
40V
●
●
●
●
0.5
●
12
●
50
●
1.2
●
Shunt Mode Minimum Current
Output Short-Circuit Current
Minimum Input Voltage (Note 7)
V
IN
is Open
11V
≤
V
IN
≤
35V
l
OUT
≤
1mA
0.1Hz
≤
f
≤
10Hz
10Hz
≤
f
≤
10kHz
∆t
= 1000 Hrs
Non-Cumulative
∆T
= 50°C
1.1
30
10.8
6
11
15
5
11.0
MIN
9.995
9.990
9.980
LT1031
TYP
10.000
10.000
10.000
3
6
10
1
MAX
10.005
10.010
10.020
5
15
25
4
6
2
4
25
40
100
150
1.7
2.0
1.5
UNITS
V
V
V
ppm/°C
ppm/°C
ppm/°C
ppm/V
ppm/V
ppm/V
ppm/V
ppm/mA
ppm/mA
ppm/mA
ppm/mA
mA
mA
mA
mA
V
µV
P-P
µV
RMS
ppm
ppm
1031fb
∆V
R
∆T
Output Voltage Temperature
Coefficient (Note 3)
∆V
R
∆V
IN
Line Regulation (Note 4)
∆V
R
∆I
O
∆V
R
∆I
O
I
Q
I
MIN
Load Regulation (Sourcing Current)
Load Regulation (Shunt Mode)
Series Mode Supply Current
0
≤
I
OUT
≤
10mA
(Note 4)
1.7mA
≤
I
SHUNT
≤
10mA
(Notes 4, 5)
e
n
∆V
R
∆Time
Output Voltage Noise
Long Term Stability of
Output Voltage
Temperature Hysteresis of Output
2
U
W
U
U
W W
W
LT1031/LH0070
ELECTRICAL CHARACTERISTICS
SYMBOL
V
R
∆V
R
PARAMETER
Output Voltage
Output Accuracy
– 0, –1
–2
Output Accuracy
– 0, –1
–2
Output Voltage Change
with Temperature
–0
–1
–2
Line Regulation
– 0, –1
–2
Input Voltage Range
∆V
R
∆I
O
I
Q
∆l
Q
∆V
IN
e
n
r
O
∆V
Z
∆Time
Load Regulation
Quiescent Current
Change in Quiescent Current
Output Noise Voltage
Ripple Rejection
Output Resistance
Long Term Stability
– 0, –1
–2
T
A
= 25°C (Note 8)
f = 120Hz
●
●
0mA
≤
l
OUT
≤
5mA
13V
≤
V
IN
≤
33V
∆V
IN
= 20V from 13V TO 33V
(LH0070) The
●
denotes the specifications which apply over the full
operating temperature range. V
IN
= 15V, R
L
= 10kΩ, – 55°C
≤
T
A
≤
125°C, unless noted.
CONDITIONS
T
A
= 25°C
T
A
= 25°C
MIN
LH0070
TYP
10.000
±
0.03
±
0.02
●
±
0.1
±
0.05
0.3
0.2
MAX
UNITS
V
%
%
%
%
∆V
R
T
A
= –55°C, 125°C
∆V
R
∆T
Note 6
●
●
●
13V
≤
V
IN
≤
33V, T
A
= 25°C
0.006
0.006
●
●
●
●
11.4
0.01
1.2
0.1
6
0.001
0.2
0.6
±
0.2
±
0.05
0.1
0.03
40
0.03
5
1.5
%
%
V
%
mA
mA
µV
P-P
%/V
P-P
Ω
%/Yr
%/Yr
±
0.02
±
0.01
±
0.2
±
0.1
±
0.04
%
%
%
∆V
R
∆V
IN
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
Output voltage is measured immediately after turn-on. Changes
due to chip warm-up are typically less than 0.005%.
Note 3:
Temperature coefficient is measured by dividing the change in
output voltage over the temperature range by the change in temperature.
Separate tests are done for hot and cold: T
MIN
to 25°C and 25°C to T
MAX
.
Incremental slope is also measured at 25
°
C.
For LT1031BMH, the
5ppm/°C drift specification is for – 25°C to 85°C. Drift over the full – 55°C
to 125°C range is guaranteed to 7ppm/°C.
Note 4:
Line and load regulation are measured on a pulse basis. Output
changes due to die temperature change must be taken into account
separately. Package thermal resistance is 150°C/W.
Note 5:
Shunt mode regulation is measured with the input open. With the
input connected, shunt mode current can be reduced to 0mA. Load
regulation will remain the same.
Note 6:
Temperature drift is guaranteed from –25°C to 85°C on LH0070.
Note 7:
See curve for guaranteed minimum V
IN
versus I
OUT
.
Note 8:
Guaranteed by design.
1031fb
3
LT1031/LH0070
CROSS REFERENCE
The following cross reference guide may be used to select
LT1031 grades which meet or exceed output voltage,
temperature drift, load and line regulation, and output
current specifications of the AD581 reference. Parameters
such as noise, hysteresis, and long term stability will be
significantly better for all LT1031 grades compared to the
AD581.
CROSS REFERENCE GUIDE/LT1031 TO AD581
AD581J
AD581K
AD581L
A0581S
A0581U
order LT1031DCH
order LT1031CCH
order LT1031BCH
order LT1031DMH
order LT1031BMH
TYPICAL PERFOR A CE CHARACTERISTICS
Ripple Rejection
115
110
REJECTION (dB)
REJECTION (dB)
f = 150Hz
INPUT VOLTAGE (V)
105
100
95
90
85
0
5
10
15 20 25 30
INPUT VOLTAGE (V)
Start-Up (Series Mode)
13
12
11
OUTPUT VOLTAGE (V)
V
IN
= 0 TO 12V
NOISE VOLTAGE (nV/√Hz)
10
9
8
7
6
5
4
3
0
2
4
6
8
TIME (µs)
10
12
14
OUTPUT VOLTAGE (V)
4
U W
U
Ripple Rejection
130
120
110
100
90
80
70
60
50
35
40
10
100
1k
FREQUENCY (Hz)
10k
LT1031 • TPC02
LT1031 • TPC01
Minimum Input Voltage
11.6
11.4
11.2
11.0
10.8
10.6
10.4
10.2
10.0
0
2
4
6 8 10 12 14 16 18 20
OUTPUT CURRENT (mA)
LT1031 • TPC03
V
IN
= 15V
C
OUT
= 0
GUARANTEED
CURVE-ALL
TEMPS
T
J
= 125°C
T
J
= –55°C
T
J
= 25°C
Start-Up (Shunt Mode)
11
10
9
8
–12V
1k
V
OUT
OUT
NC
IN
GND
Output Voltage Noise Spectrum
400
350
300
250
200
150
100
50
7
6
5
0
2
0V
6
4
TIME (µs)
8
10
12
0
10
100
1k
FREQUENCY (Hz)
10k
LT1031 • TPC06
LT1031 • TPC04
LT1031 • TPC05
1031fb
LT1031/LH0070
TYPICAL PERFOR A CE CHARACTERISTICS
Output Voltage Noise
16
14
12
RMS NOISE (µV)
C
OUT
= 0
FILTER = 1 POLE
f
LOW
= 0.1Hz
OUTPUT CHANGE (mV)
2
1
0
–1
–2
–3
–4
OUTPUT VOLTAGE (V)
10
8
6
4
2
0
10
100
1k
BANDWIDTH (Hz)
10k
LT1031 • TPC07
Input Supply Current
1.8
1.6
1.4
INPUT CURRENT (mA)
I
OUT
= 0
T
J
= –55°C
CURRENT INTO OUTPUT (mA)
T
J
= 25°C
T
J
= 125°C
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
T
J
= 125°C
T
J
= 25°C
T
J
= –55°C
CURRENT INTO OUTPUT (mA)
1.2
1.0
0.8
0.6
0.4
0.2
0
0
5
10
25 30
INPUT VOLTAGE (V)
15
20
Thermal Regulation
V
IN
= 30V
∆POWER
= 200mW
OUTPUT VOLTAGE CHANGE
OUTPUT CHANGE (mV)
OUTPUT VOLTAGE CHANGE
0
–0.5
–1.0
–1.5
I
LOAD
= 10mA
LOAD
REGULATION
THERMAL*
REGULATION
–20
40 60 80 100 120 140
TIME (ms)
*INDEPENDENT OF TEMPERATURE COEFFICIENT
0
20
LT1031 • TPC13
U W
35
LT1031 • TPC10
Load Regulation
5
4
3
V
IN
= 12V
10.006
10.004
10.002
10.000
9.998
9.996
Output Voltage Temperature
–5
–10 –8 –6 –4 –2 0 2 4 6 8
SOURCING
SINKING
OUTPUT CURRENT (mA)
10
9.994
–50 –25
50
25
75
0
TEMPERATURE (˚C)
100
125
LT1031 • TPC08
LT1031 • TPC09
Shunt Characteristics
1.8
1.6
INPUT PIN OPEN
Shunt Mode Current Limit
60
50
40
30
20
10
0
INPUT PIN IS OPEN
40
0
2
4
6
10
8
OUTPUT TO GROUND VOLTAGE (V)
12
0
2
4
6
8 10 12 14
OUTPUT VOLTAGE (V)
16
18
LT1031 • TPC11
LT1031 • TPC12
Load Transient Response
C
LOAD
= 0
∆I
SOURCE
= 100µAp-p
I
SOURCE
= 0
∆I
SINK
= 100µAp-p
I
SINK
= 0.6mA
50mV
10mV
I
SINK
= 0.8mA
I
SOURCE
= 0.2mA
Load Transient Response
C
LOAD
= 1000pF
∆I
SOURCE
= 100µAp-p
I
SOURCE
= 0
∆I
SINK
= 100µAp-p
I
SINK
= 0.8mA
20mV
5mV
I
SINK
= 1.2mA
I
SOURCE
= 0.5mA
I
SOURCE
= 2 TO 10mA
I
SINK
= 1.4mA
I
SINK
= 1.0mA
I
SOURCE
= 2 TO 10mA
–2
0
1
2
I
SINK
= 2 TO 10mA
9
0
2
4
I
SINK
= 2 TO 10mA
6 8 0 2 4 6
TIME (µs)
NOTE VERTICAL SCALE CHANGE
BETWEEN SOURCING AND SINKING
8
3 4 5 6 7 8
TIME (µs)
NOTE VERTICAL SCALE CHANGE
BETWEEN SOURCING AND SINKING
LT1031 • TPC14
LT1031 • TPC15
1031fb
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