LH0070-0H#PBF [ADI]
Three Terminal Voltage Reference, 1 Output, 10V, MBCY3;
| 型号： | LH0070-0H#PBF |
| 厂家： | 
ADI |
| 描述： | Three Terminal Voltage Reference, 1 Output, 10V, MBCY3 |
| 文件： | 总12页 (文件大小：160K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1031/LH0070
Precision 10V Reference
U
FEATURES
DESCRIPTIO
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.
■
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 < 1ppmP-P 0.1Hz to 10Hz
> 100dB Ripple Rejection
Minimum Input Voltage of 11V
■
■
■
■
■
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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.
APPLICATIO S
■
A-to-D and D-to-A Converters
■
Precision Regulators
■
Digital Voltmeters
■
lnertial Navigation Systems
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.
■
Precision Scales
■
Portable Reference Standard
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.
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TYPICAL APPLICATIO
Basic Positive and
Negative Connections
Distribution of Output Accuracy
40
T
= 25°C
A
DISTRIBUTION
FROM 5 RUNS
35
30
25
LT1031
GND
LT1031
V
V
IN
IN
OUT
OUT
OUT
GND
20
15
– V
OUT
10
5
V
– V
OUT
+ 1.5mA
IN
R1 =
R1
I
LOAD
– V
IN
LT1031 • TA01
0
–0.06
–0.02
0.02
0
–0.10
0.06
0.10
OUTPUT ACCURACY (%)
LT1031 TA02
1031fb
1
LT1031/LH0070
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ABSOLUTE AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
(Note 1)
BOTTOM VIEW
INPUT
Input Voltage ........................................................... 40V
Input-Output Voltage Differential ............................. 35V
Output to Ground Voltage
1
(Shunt Mode Current Limit)................................. 16V
Trim Pin to Ground Voltage
2
OUTPUT
3
Positive ................................................. Equal to VOUT
Negative............................................................. –20V
Output Short-Circuit Duration
GROUND
H PACKAGE
3-LEAD TO-39 METAL CAN
VIN = 35V ......................................................... 10 sec
VIN ≤ 20V ..................................................... Indefinite
Operating Temperature Range
LT1031M .......................................... –55°C to 125°C
LT1031C .................................................. 0°C to 70°C
Lead Temperature (Soldering, 10 sec).................. 300°C
T
= 150°C, θ = 150°C/W, θ = 45°C/W (LH0070)
JA JC
JMAX
T
T
= 150°C, θ = 150°C/W, θ = 45°C/W (LT1031M)
JMAX
JA JC
= 85°C, θ = 150°C/W, θ = 45°C/W (LT1031C)
JA JC
JMAX
ORDER PART NUMBER
LT1031BMH
LT1031DMH
LT1031BCH
LT1031CCH
LT1031DCH
LH0070-0H
LH0070-1H
LH0070-2H
ELECTRICAL CHARACTERISTICS
(LT1031) The
●
denotes the specifications which apply over the full operating
= 0, Mil or Comm version, unless noted.
temperature range, otherwise specifications are at T = 25°C. V = 15V, I
A
IN
OUT
LT1031
TYP
SYMBOL
PARAMETER
CONDITIONS
MIN
MAX
UNITS
V
Output Voltage (Note 2)
LT1031B
LT1031C
LT1031D
9.995
9.990
9.980
10.000
10.000
10.000
10.005
10.010
10.020
V
V
V
R
∆V
Output Voltage Temperature
Coefficient (Note 3)
T
≤ T ≤ T
MIN J MAX
R
∆T
LT1031B
LT1031C
LT1031D
●
●
●
3
6
10
5
15
25
ppm/°C
ppm/°C
ppm/°C
∆V
Line Regulation (Note 4)
11.5V ≤ V ≤ 14.5V
1
4
6
ppm/V
ppm/V
R
IN
∆V
∆V
●
●
●
●
●
IN
4.5V ≤ V ≤ 40V
0.5
12
50
1.2
2
4
ppm/V
ppm/V
IN
Load Regulation (Sourcing Current)
Load Regulation (Shunt Mode)
Series Mode Supply Current
0 ≤ I
≤ 10mA
25
40
ppm/mA
ppm/mA
R
O
OUT
(Note 4)
∆I
∆V
1.7mA ≤ I
≤ 10mA
SHUNT
100
150
ppm/mA
ppm/mA
R
O
∆I
(Notes 4, 5)
I
1.7
2.0
mA
mA
Q
I
Shunt Mode Minimum Current
Output Short-Circuit Current
Minimum Input Voltage (Note 7)
Output Voltage Noise
V
is Open
IN
1.1
30
1.5
mA
mA
V
MIN
11V ≤ V ≤ 35V
IN
l
≤ 1mA
10.8
11.0
OUT
e
0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 10kHz
6
11
µV
P-P
µV
RMS
n
∆V
Long Term Stability of
Output Voltage
∆t = 1000 Hrs
15
5
ppm
R
∆Time
Non-Cumulative
Temperature Hysteresis of Output
∆T = 50°C
ppm
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2
LT1031/LH0070
ELECTRICAL CHARACTERISTICS
(LH0070) The
●
denotes the specifications which apply over the full
operating temperature range. VIN = 15V, RL = 10kΩ, –55°C ≤ TA ≤ 125°C, unless noted.
LH0070
TYP
SYMBOL
PARAMETER
CONDITIONS
T = 25°C
MIN
MAX
UNITS
V
Output Voltage
10.000
V
R
A
∆V
∆V
∆V
Output Accuracy
– 0, –1
– 2
T = 25°C
A
R
R
R
± 0.03
± 0.02
± 0.1
%
%
± 0.05
Output Accuracy
– 0, –1
– 2
T = –55°C, 125°C
A
●
0.3
0.2
%
%
Output Voltage Change
with Temperature
Note 6
∆T
– 0
– 1
– 2
●
●
●
± 0.2
± 0.1
± 0.04
%
%
%
± 0.02
± 0.01
∆V
Line Regulation
– 0, –1
– 2
13V ≤ V ≤ 33V, T = 25°C
R
IN
A
∆V
∆V
0.006
0.006
0.1
0.03
%
%
IN
Input Voltage Range
Load Regulation
●
●
11.4
40
V
0mA ≤ l
≤ 5mA
0.01
0.03
%
R
O
OUT
∆I
I
Quiescent Current
13V ≤ V ≤ 33V
●
●
1.2
0.1
5
mA
mA
Q
IN
∆l
∆V
Change in Quiescent Current
∆V = 20V from 13V TO 33V
IN
1.5
Q
IN
e
Output Noise Voltage
Ripple Rejection
6
µV
n
P-P
f = 120Hz
●
●
0.001
0.2
%/V
P-P
r
Output Resistance
0.6
Ω
O
∆V
Long Term Stability
– 0, –1
– 2
T = 25°C (Note 8)
A
Z
∆Time
± 0.2
± 0.05
%/Yr
%/Yr
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
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.
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.
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.
Separate tests are done for hot and cold: T
to 25°C and 25°C to T
.
Note 6: Temperature drift is guaranteed from –25°C to 85°C on LH0070.
MIN
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 7: See curve for guaranteed minimum V versus I
.
IN
OUT
Note 8: Guaranteed by design.
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3
LT1031/LH0070
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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
currentspecificationsoftheAD581reference.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
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TYPICAL PERFOR A CE CHARACTERISTICS
Ripple Rejection
Ripple Rejection
Minimum Input Voltage
11.6
11.4
11.2
11.0
10.8
10.6
10.4
10.2
10.0
130
120
110
100
90
115
110
105
100
95
T = 125°C
V
= 15V
OUT
f = 150Hz
J
IN
GUARANTEED
CURVE-ALL
TEMPS
C
= 0
T = –55°C
J
T = 25°C
J
80
70
90
60
50
85
25 30
10 15 20
INPUT VOLTAGE (V)
0
5
35 40
10
100
1k
10k
0
2
4
6
8
10 12 14 16 18 20
FREQUENCY (Hz)
OUTPUT CURRENT (mA)
LT1031 • TPC02
LT1031 • TPC01
LT1031 • TPC03
Start-Up (Series Mode)
Start-Up (Shunt Mode)
Output Voltage Noise Spectrum
13
12
11
10
9
11
10
9
400
350
300
250
200
150
100
50
V
= 0 TO 12V
IN
8
8
–12V
0V
1k
7
V
OUT
7
6
5
6
OUT
GND
NC IN
5
4
3
0
6
10
12
12
0
2
4
8
0
2
4
6
8
10
14
10
100
1k
10k
TIME (µs)
TIME (µs)
FREQUENCY (Hz)
LT1031 • TPC04
LT1031 • TPC05
LT1031 • TPC06
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LT1031/LH0070
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TYPICAL PERFOR A CE CHARACTERISTICS
Output Voltage Noise
Load Regulation
Output Voltage Temperature
5
4
16
14
12
10
8
10.006
10.004
10.002
10.000
V
= 12V
C
= 0
IN
OUT
FILTER = 1 POLE
= 0.1Hz
f
LOW
3
2
1
0
–1
–2
–3
6
9.998
9.996
9.994
4
2
–4
–5
0
–10 –8 –6 –4 –2
SOURCING
0
2
4
6
8
10
50
TEMPERATURE (˚C)
100 125
10
100
1k
10k
–50 –25
0
25
75
SINKING
BANDWIDTH (Hz)
OUTPUT CURRENT (mA)
LT1031 • TPC07
LT1031 • TPC09
LT1031 • TPC08
Input Supply Current
Shunt Characteristics
Shunt Mode Current Limit
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
60
50
1.8
1.6
1.4
1.2
INPUT PIN OPEN
I
= 0
INPUT PIN IS OPEN
OUT
T = –55°C
J
T = 25°C
J
T
= –55°C
J
40
T = 125°C
J
1.0
0.8
0.6
0.4
0.2
T
= 25°C
J
30
20
T
= 125°C
J
10
0
0
0
15 20
INPUT VOLTAGE (V)
0
2
4
6
10
12
0
5
10
25 30 35 40
0
2
4
6
10
14 16 18
8
8
12
OUTPUT TO GROUND VOLTAGE (V)
OUTPUT VOLTAGE (V)
LT1031 • TPC11
LT1031 • TPC12
LT1031 • TPC10
Load Transient Response
CLOAD = 0
Load Transient Response
CLOAD = 1000pF
Thermal Regulation
∆I
= 100µAp-p
∆I
SINK
= 100µAp-p
∆I
= 100µAp-p
SOURCE
∆I
= 100µAp-p
V
= 30V
SINK
IN
SINK
SOURCE
I
= 0.6mA
∆POWER = 200mW
I
= 0
I
= 0
I
= 0.8mA
SOURCE
SOURCE
SINK
20mV
= 1.2mA
50mV
0
–0.5
–1.0
–1.5
LOAD
5mV
I
SINK
10mV
REGULATION
I
= 0.8mA
SINK
THERMAL*
REGULATION
I
= 0.5mA
SOURCE
I
I
= 0.2mA
I
= 1.0mA
I
= 1.4mA
SOURCE
SOURCE
SINK
SINK
I
= 2 TO 10mA
SOURCE
I
= 10mA
LOAD
I
= 2 TO 10mA
= 2 TO 10mA
I
= 2 TO 10mA
SINK
SINK
60 80
TIME (ms)
0
2
0
2
4
6
8
–20
0
20 40
100 120 140
–2
0
1
5
6
8
4
6
8
2
3
4
7
9
TIME (µs)
NOTE VERTICAL SCALE CHANGE
BETWEEN SOURCING AND SINKING
TIME (µs)
NOTE VERTICAL SCALE CHANGE
BETWEEN SOURCING AND SINKING
*INDEPENDENT OF TEMPERATURE COEFFICIENT
LT1031 • TPC13
LT1031 • TPC15
LT1031 • TPC14
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LT1031/LH0070
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TYPICAL PERFOR A CE CHARACTERISTICS
Output Noise 0.1Hz to 10Hz
FILTERING = 1 ZERO AT 0.1Hz
2 POLES AT 10Hz
10µV (1ppm)
4
6
0
1
2
3
5
TIME (MINUTES)
LT1031 • TPC16
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APPLICATIO S I FOR ATIO
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Trimming Output Voltage
Effect of Reference Drift on System Accuracy
The LT1031 output can be trimmed by driving the ground
pin. The suggested method is shown in the illustration
below. A 5Ω resistor is inserted in series with the ground
pin. The top of the resistor is supplied current from a trim
potentiometer. This technique requires fairly high trim
currentofupto1.5mAfromtheLT1031or3.5mAfromthe
–15V supply; however it is necessary to maintain low drift
inthereference.GroundpincurrentchangesintheLT1031,
with temperature, could be as high as 4µA/°C. This,
coupled with the 5Ω external resistor, creates up
to 2ppm/°C drift in the reference (5Ω • 4µA/°C = 20µV/°C
= 2ppm/°C). If induced drift higher than this can be
tolerated,allresistorvaluesinthetrimcircuitcanberaised
proportionately to reduce current drain.
A large portion of the temperature drift error budget in
many systems is the system reference voltage. The graph
below indicates the maximum temperature coefficient
allowable if the reference is to contribute no more than
1/2LSB error to the overall system performance. The
example shown is a 12-bit system designed to operate
over a temperature range from 25°C to 65°C. Assuming
the system calibration is performed at 25°C, the
temperature span is 40°C. The graph shows that the
temperature coefficient of the reference must be no worse
than 3ppm/°C if it is to contribute less than 1/2LSB error.
For this reason, the LT1031 has been optimized for low
drift.
Maximum Allowable Reference Drift
100
Output Voltage Trimming
8-BIT
LT1031
V
IN
OUT
V
OUT
IN
10-BIT
GND
10
R2*
4.3k
R3
50k
12-BIT
14-BIT
R1**
5Ω
–15V
1.0
*CAN BE INCREASED TO 5.6k FOR
LT1031B AND LH0070-2
**INCREASE TO 10Ω FOR LT1031D
10 20
40
60 70 80
100
90
30
50
TEMPERATURE SPAN (°C)
LT1031 • TA04
LT1031 • TA03
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LT1031/LH0070
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APPLICATIO S I FOR ATIO
Capacitive Loading and Transient Response
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Series Mode with Boost Transistor
INPUT
The LT1031 is stable with all capacitive loads, but for
optimum settling with load transients, output capacitance
shouldbeunder1000pF. Theoutputstageofthereference
is class AB with a fairly low idling current. This makes
transient response worst-case at light load currents.
Because of internal current drain on the output, actual
worst-case occurs at ILOAD = 1.4mA (sinking).
Significantly better load transient response is obtained by
moving slightly away from these points. See Load
Transient Response curves for details. In general, best
transientresponseisobtainedwhentheoutputissourcing
current. In critical applications, a 10µF solid tantalum
capacitor with several ohms in series provides optimum
output bypass.
R1
220Ω
2N3906
IN
LT1031 OUT
GND
R2*
5.6k
LOAD
GROUND
RETURN
*OPTIONAL—REDUCES CURRENT IN OUTPUT SENSE LEAD
LT1031 • TA06
Kelvin Connections
Effects of Air Movement on Low Frequency Noise
Although the LT1031 does not have true force/sense
capabilityatitsoutputs,significantimprovementsinground
loop and line loss problems can be achieved with proper
hook-up. In series mode operation, the ground pin of the
LT1031carriesonly≈1mAandcanbeusedasasenseline,
greatlyreducinggroundloopandlossproblemsonthelow
side of the reference. The high side supplies load current
so line resistance must be kept low. Twelve feet of
#22 gauge hook up wire or 1 foot of 0.025 inch printed
circuit trace will create 2mV loss at 10mA output current.
This is equivalent to 1LSB in a 10V, 12-bit system.
TheLT1031hasverylownoisebecauseoftheburiedzener
usedinitsdesign.Inthe0.1Hzto10Hzband,peak-to-peak
noise is about 0.5ppm of the DC output. To achieve this
low noise, however, care must be taken to shield the
reference from ambient air turbulence. Air movement can
create noise because of thermoelectric differences
betweenICpackageleads(especiallykovarleadTO-5)and
printed circuit board materials and/or sockets. Power
dissipation in the reference, even though it rarely exceeds
20mW, is enough to cause small temperature gradients in
thepackageleads.Variationsinthermalresistance,caused
The following circuits show proper hook-up to minimize by uneven airflow, create differential lead temperatures,
errors due to ground loops and line losses. Losses in the therebycausingthermoelectricvoltagenoiseattheoutput
output lead can be greatly reduced by adding a PNP boost of the reference. The XY plotter trace shown on the
transistor if load currents are 5mA or higher. R2 can be following page dramatically illustrates this effect. The first
added to further reduce current in the output sense lead. half of the plot was done with the LT1031 shielded from
ambient air with a small foam cup. The cup was then
Standard Series Mode
removed for the second half of the trace. Ambient in both
LT1031
cases was a lab environment with no excessive air turbu-
KEEP THIS LINE RESISTANCE LOW
IN
OUT
INPUT
lence from air conditioners, opening/closing doors, etc.
Removing the foam cup increases the output noise by
almost an order of magnitude in the 0.01Hz to 1Hz band!
The kovar leads of the TO-5 (H) package are the primary
culprit. Alloy 42 and copper lead frames used on dual-in-
line packages are not nearly as sensitive to thermally
generated noise because they are intrinsically matched.
+
LOAD
GND
GROUND
RETURN
LT1031 • TA05
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7
LT1031/LH0070
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Noise Induced by Air Turbulence
(TO-5 Package)
APPLICATIO S I FOR ATIO
There is nothing magical about foam cups—any
enclosure which blocks air flow from the reference will do.
Smaller enclosures are better since they do not allow the
build-up of internally generated air movement. Naturally,
heat generating components external to the reference
itself should not be included inside the enclosure.
(TO-5 PACKAGE)
f = 0.01Hz to 10Hz
20µV
FOAM CUP REMOVED
8
12
0
2
4
6
10
TIME (MINUTES)
LT1031 • TA07
U
APPLICATIO CIRCUITS
Negative Series Reference
Boosted Output Current with No Current Limit
+
15V
V
≥ 11.8V
R1
220Ω
R1
4.7k
LT1031
OUT
2N2905
10V
IN
D1
R2
4.7k
IN
15V
GND
LT1031 OUT
GND
AT 100mA
–10V
+
–15V
2µF
SOLID
TANT
AT 50mA
Q1
2N2905
LT1031 • AC01
LT1031 • AC02
Boosted Output Current with Current Limit
Handling Higher Load Currents
15V
30mA
+
V
≥ 12.8V
D1*
LED
R1
220Ω
8.2Ω
R1*
169Ω
IN
V
= 10V
LT1031 OUT
GND
OUT
2N2905
IN
TYPICAL LOAD
CURRENT = 30mA
R
L
10V
AT 100mA
LT1031 OUT
GND
+
2µF
SOLID
TANT
*SELECT R1 TO DELIVER TYPICAL LOAD CURRENT
LT1031 WILL THEN SOURCE OR SINK AS NECESSARY
TO MAINTAIN PROPER OUTPUT. DO NOT REMOVE LOAD,
AS OUTPUT WILL BE DRIVEN (UNREGULATED) HIGH. LINE
REGULATION IS DEGRADED IN THIS APPLICATION
LT1031 • AC04
*GLOWS IN CURRENT LIMIT
DO NOT OMIT
LT1031 • AC03
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8
LT1031/LH0070
U
APPLICATIO CIRCUITS
Strain Gauge Conditioner
for 350Ω Bridge
R1
357Ω
1/2W
28mA
LT1031
OUT
28.5mA
IN
15V
5V
350Ω STRAIN
GUAGE BRIDGE**
R3
2MΩ
GND
R2
20k
–
3
2
2
+
6
V
• 100
6
OUT
LM301A†
LT1012C
+
R4
20k
3
1
–
R5
2M
100pF
8
R6
2MΩ*
–5V
*THIS RESISTOR PROVIDES POSITIVE FEEDBACK TO THE BRIDGE TO ELIMINATE
LOADING EFFECT OF THE AMPLIFIER. EFFECTIVE Z OF AMPLIFIER STAGE IS
357Ω
1/2W
IN
≥ 1MΩ. IF R2–R5 ARE CHANGED, SET R6 = R3
**BRIDGE IS ULTRA LINEAR WHEN ALL LEGS ARE ACTIVE, TWO IN COMPRESSION
AND TWO IN TENSION, OR WHEN ONE SIDE IS ACTIVE WITH ONE COMPRESSED
AND ONE TENSIONED LEG
–15V
†OFFSET AND DRIFT OF LM301A ARE VIRTUALLY ELIMINATED BY DIFERENTIAL
CONNECTION OF LT1012C
LT1031 • AC05
Ultralinear Platinum Temperature Sensor*
LT1031
OUT
IN
20V
GND
R2*
5k
R1**
253k
R14
5k
R10
182k
1%
R11
6.65M
1%
R15
10k
R **
f
654k
R8
10M
R9
100k
R12
1k
R13
24.3k
20V
7
R5
200k
1%
2
–
+
R4
4.75k
1%
R3**
5k
6
V
= 100mV/°C
OUT
–50°C ≤ T ≤ 150°C
LT1001
3
4
†
R
S
–15V
100Ω
AT 0°C
†STANDARD INDUSTRIAL 100Ω PLATINUM 4-WIRE SENSOR, ROSEMOUNT 78S,
OR EQUIVALENT. α = 0.00385
R6
619k
1%
R7
392k
1%
TRIM R9 FOR V
TRIM R12 FOR V
TRIM R14 FOR V
= 0 AT 0°C
OUT
OUT
OUT
= 10V AT 100°C
= 5V AT 50°C
USE TRIM SEQUENCE AS SHOWN. TRIMS ARE NON-INTERACTIVE SO THAT ONLY ONE
TRIM SEQUENCE IS NORMALLY REQUIRED.
–15V
*FEEDBACK LINEARIZES OUTPUT TO 0.005°C FROM –50°C TO 150°C
**WIREWOUND RESISTORS WITH LOW TC
LT1031 • AC06
1031fb
9
LT1031/LH0070
U
APPLICATIO CIRCUITS
2-Pole Lowpass Filtered Reference
MYLAR
1µF
V
IN
–
+
R1
LT1031
OUT
+V
LT1001
REF
36k
IN
V
IN
R2
36k
GND
TOTAL NOISE
RMS
1Hz ≤ f ≤ 10kHz
f = 10Hz
≤ 2µV
0.5µF
MYLAR
–V
REF
LT1031 • AC07
Negative Shunt Reference Driven
by Current Source
LT1031
OUT
GND
–10V (I
≤ 1mA)
LOAD
2.5mA
LM334
27Ω
–11V TO –40V
LT1031 • AC08
1031fb
10
LT1031/LH0070
U
APPLICATIO CIRCUITS
Precision DAC Reference with System TC Trim
LT1031
IN
OUT
15V
8.87k
1%
GND
50k
ROOM TEMP
TRIM
D1
IN457
10k
1%
10.36k
1%
50k
TC TRIM*
1.24k
1%
10k
1%
200k
1%
D2
IN457
50k
8.45k
1mA
*TRIMS 1mA REFERENCE CURRENT
TC BY ± 40ppm/°C. THIS TRIM
DAC
SCHEME HAS VERY LITTLE EFFECT ON ROOM
TEMPERATURE CURRENT TO MINIMIZE ITERATIVE
TRIMMING.
LT1031 • AC09
U
W
EQUIVALENT SCHEMATIC
INPUT
Q3
D1
D2
OUTPUT
R1
D3
Q1
–
+
A1
R2
D4
6.3V
Q2
GND
LT1031 • ES01
1031fb
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
LT1031/LH0070
U
PACKAGE DESCRIPTIO
H Package
3-Lead TO-39 Metal Can
(Reference LTC DWG # 05-08-1330)
.350 – .370
(8.890 – 9.398)
.305 – .335
(7.747 – 8.509)
.050
(1.270)
MAX
.165 – .185
(4.191 – 4.699)
REFERENCE
PLANE
*
.016 – .019**
.500
(12.700)
MIN
(0.406 – 0.483)
DIA
.200
(5.080)
TYP
.100
(2.540)
PIN 1
.029 – .045
(0.737 – 1.143)
.100
(2.540)
.028 – .034
(0.711 – 0.864)
45°
H3(TO-39) 0801
*LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE
AND .050" BELOW THE REFERENCE PLANE
.016 – .024
**FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS
(0.406 – 0.610)
1031fb
LT 1105 REV B • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
12
●
●
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2005
相关型号：
LH0070-0H/883
IC 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 10 V, MBCY3, METAL CAN, TO-5, 3 PIN, Voltage Reference
Linear
LH0070-0H/883C
IC 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 10 V, MBCY3, METAL CAN, TO-5, 3 PIN, Voltage Reference
Linear
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