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PDF LH0070 Data sheet ( Hoja de datos )
| Número de pieza | LH0070 | |
| Descripción | Precision 10 Volt Reference | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT1031/LH0070
Precision 10V Reference
FEATURES
■ 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
U
APPLICATIO S
■ A-to-D and D-to-A Converters
■ Precision Regulators
■ Digital Voltmeters
■ lnertial Navigation Systems
■ Precision Scales
■ Portable Reference Standard
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.
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.
TYPICAL APPLICATIO
Basic Positive and
Negative Connections
LT1031
VIN IN
OUT VOUT
GND
LT1031
OUT
GND
– VOUT
R1 = VIN – VOUT
ILOAD + 1.5mA
R1
– VIN
LT1031 • TA01
Distribution of Output Accuracy
40
TA = 25°C
35 DISTRIBUTION
FROM 5 RUNS
30
25
20
15
10
5
0
–0.10 –0.06 –0.02 0 0.02 0.06 0.10
OUTPUT ACCURACY (%)
LT1031 TA02
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TYPICAL PERFOR A CE CHARACTERISTICS
LT1031/LH0070
Output Voltage Noise
16
COUT = 0
14 FILTER = 1 POLE
fLOW = 0.1Hz
12
10
8
6
4
2
0
10 100 1k 10k
BANDWIDTH (Hz)
LT1031 • TPC07
Input Supply Current
1.8
IOUT = 0
1.6
TJ = –55°C
1.4 TJ = 25°C
1.2
TJ = 125°C
1.0
0.8
0.6
0.4
0.2
0
0 5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
LT1031 • TPC10
Thermal Regulation
VIN = 30V
∆POWER = 200mW
0
LOAD
–0.5 REGULATION
–1.0
THERMAL*
REGULATION
–1.5
ILOAD = 10mA
–20 0 20 40 60 80 100 120 140
TIME (ms)
*INDEPENDENT OF TEMPERATURE COEFFICIENT
LT1031 • TPC13
Load Regulation
5
VIN = 12V
4
3
2
1
0
–1
–2
–3
–4
–5
–10 –8 –6 –4 –2 0 2 4 6 8 10
SOURCING
SINKING
OUTPUT CURRENT (mA)
LT1031 • TPC08
Shunt Characteristics
1.8
INPUT PIN OPEN
1.6
1.4
1.2 TJ = –55°C
1.0
TJ = 25°C
0.8
0.6
0.4 TJ = 125°C
0.2
0
02
46
8 10 12
OUTPUT TO GROUND VOLTAGE (V)
LT1031 • TPC11
Load Transient Response
CLOAD = 0
∆ISOURCE = 100µAp-p
ISOURCE = 0
10mV
∆ISINK = 100µAp-p
ISINK = 0.6mA
50mV
ISINK = 0.8mA
ISOURCE = 0.2mA
ISINK = 1.0mA
Output Voltage Temperature
10.006
10.004
10.002
10.000
9.998
9.996
9.994
–50 –25
0 25 50 75
TEMPERATURE (˚C)
100 125
LT1031 • TPC09
Shunt Mode Current Limit
60
INPUT PIN IS OPEN
50
40
30
20
10
0
02
4 6 8 10 12 14 16 18
OUTPUT VOLTAGE (V)
LT1031 • TPC12
Load Transient Response
CLOAD = 1000pF
∆ISOURCE = 100µAp-p ∆ISINK = 100µAp-p
ISOURCE = 0
ISINK = 0.8mA
20mV
5mV ISINK = 1.2mA
ISOURCE = 0.5mA
ISOURCE = 2 TO 10mA
ISINK = 1.4mA
ISOURCE = 2 TO 10mA ISINK = 2 TO 10mA
–2 0 1 2 3 4 5 6 7 8 9
TIME (µs)
NOTE VERTICAL SCALE CHANGE
BETWEEN SOURCING AND SINKING
LT1031 • TPC14
ISINK = 2 TO 10mA
0246802468
TIME (µs)
NOTE VERTICAL SCALE CHANGE
BETWEEN SOURCING AND SINKING
LT1031 • TPC15
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APPLICATIO CIRCUITS
LT1031/LH0070
Precision DAC Reference with System TC Trim
LT1031
15V IN
OUT
GND
8.87k
1%
1.24k
1%
D1
IN457
50k
TC TRIM*
10k
1%
50k
ROOM TEMP
TRIM
10k
1%
D2 200k
IN457 1%
10.36k
1%
50k
1mA
8.45k
*TRIMS 1mA REFERENCE CURRENT
TC BY ± 40ppm/°C. THIS TRIM
SCHEME HAS VERY LITTLE EFFECT ON ROOM
TEMPERATURE CURRENT TO MINIMIZE ITERATIVE
TRIMMING.
DAC
LT1031 • AC09
EQUIVALENT SCHEMATIC
INPUT
Q3
D1
D2
D3
OUTPUT
R1
Q1
–+
A1
D4
6.3V
R2
Q2
GND
LT1031 • ES01
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-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LH0070.PDF ] | |
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