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LH0070-1H

P1-P3P4-P6P7-P9P10-P12
4
LT1031/LH0070
1031fb
TYPICAL PERFOR A CE CHARACTERISTICS
UW
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.
Ripple Rejection Minimum Input VoltageRipple Rejection
INPUT VOLTAGE (V)
0
85
REJECTION (dB)
90
95
100
105
10 20
30
40
LT1031 • TPC01
110
115
515
25
35
f = 150Hz
OUTPUT CURRENT (mA)
0
INPUT VOLTAGE (V)
11.6
11.4
11.2
11.0
10.8
10.6
10.4
10.2
10.0
16
LT1031 • TPC03
4 8 12 20142 6 10 18
GUARANTEED
CURVE-ALL
TEMPS
T
J
= 25°C
T
J
= 125°C
T
J
= –55°C
LT1031 • TPC02
FREQUENCY (Hz)
10
90
REJECTION (dB)
110
130
100 1k 10k
70
80
100
120
60
50
V
IN
= 15V
C
OUT
= 0
Start-Up (Series Mode) Start-Up (Shunt Mode) Output Voltage Noise Spectrum
TIME (µs)
3
OUTPUT VOLTAGE (V)
4
6
7
8
13
10
2
6
8
LT1031 • TPC04
5
11
12
9
04
10
12
14
V
IN
= 0 TO 12V
LT1031 • TPC06
FREQUENCY (Hz)
10
200
NOISE VOLTAGE (nV/√Hz)
300
400
100 1k 10k
100
150
250
350
50
0
CROSS REFERENCE
U
TIME (µs)
OUTPUT VOLTAGE (V)
9
10
11
48
8
7
02
61012
6
5
LT1031 • TPC05
NC
0V
–12V
GND
IN
V
OUT
OUT
1k
CROSS REFERENCE GUIDE/LT1031 TO AD581
AD581J order LT1031DCH
AD581K order LT1031CCH
AD581L order LT1031BCH
A0581S order LT1031DMH
A0581U order LT1031BMH
5
LT1031/LH0070
1031fb
Output Voltage Noise Load Regulation
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Output Voltage Temperature
LT1031 • TPC07
BANDWIDTH (Hz)
10
8
RMS NOISE (µV)
12
16
100 1k 10k
4
6
10
14
2
0
C
OUT
= 0
FILTER = 1 POLE
f
LOW
= 0.1Hz
SOURCING
OUTPUT CURRENT (mA)
SINKING
–10
OUTPUT CHANGE (mV)
1
3
2
0
–2
–4
5
4
6
–1
–3
–5
–6–8
–2–4
24 8
0
10
LT1031 • TPC08
V
IN
= 12V
TEMPERATURE (˚C)
–50
OUTPUT VOLTAGE (V)
10.002
10.004
10.006
25 75
10.000
9.998
–25 0
50 100 125
9.996
9.994
LT1031 • TPC09
Input Supply Current Shunt Mode Current LimitShunt Characteristics
INPUT VOLTAGE (V)
05
INPUT CURRENT (mA)
1.0
1.2
1.4
35 40
0.8
0.6
0.2
0
10
15 20
25 30
0.4
1.8
1.6
LT1031 • TPC10
I
OUT
= 0
T
J
= 125°C
T
J
= –55°C
T
J
= 25°C
OUTPUT TO GROUND VOLTAGE (V)
0
0
CURRENT INTO OUTPUT (mA)
0.2
0.6
0.8
1.0
8
1.8
0.4
42 6 10 12
1.2
1.4
1.6
LT1031 • TPC11
INPUT PIN OPEN
T
J
= 125°C
T
J
= –55°C
T
J
= 25°C
OUTPUT VOLTAGE (V)
0
0
CURRENT INTO OUTPUT (mA)
10
30
40
50
4
8
10 18
20
26
12
14
16
60
LT1031 • TPC12
INPUT PIN IS OPEN
Thermal Regulation
Load Transient Response
C
LOAD
= 0
Load Transient Response
C
LOAD
= 1000pF
TIME (µs)
OUTPUT VOLTAGE CHANGE
4
20
64
02 6
8
8
LT1031 • TPC15
NOTE VERTICAL SCALE CHANGE
BETWEEN SOURCING AND SINKING
I
SINK
= 2 TO 10mA
I
SOURCE
= 0
I
SINK
= 1.4mA
I
SINK
= 1.2mA
∆I
SOURCE
= 100µAp-p
I
SOURCE
= 0.5mA
I
SOURCE
= 2 TO 10mA
∆I
SINK
= 100µAp-p
5mV
20mV
I
SINK
= 0.8mA
TIME (ms)
*INDEPENDENT OF TEMPERATURE COEFFICIENT
OUTPUT CHANGE (mV)
–1.0
0
140
20–20
60
100
0
40
80
120
–1.5
–0.5
LT1031 • TPC13
I
LOAD
= 10mA
V
IN
= 30V
∆POWER = 200mW
LOAD
REGULATION
THERMAL*
REGULATION
TIME (µs)
OUTPUT VOLTAGE CHANGE
7
10–2
32
56 8
4
9
LT1031 • TPC14
NOTE VERTICAL SCALE CHANGE
BETWEEN SOURCING AND SINKING
I
SINK
= 2 TO 10mA
I
SOURCE
= 0
I
SINK
= 1.0mA
I
SINK
= 0.8mA
∆I
SOURCE
= 100µAp-p
I
SOURCE
= 0.2mA
I
SOURCE
= 2 TO 10mA
I
SINK
= 0.6mA
∆I
SINK
= 100µAp-p
10mV
50mV
6
LT1031/LH0070
1031fb
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Output Noise 0.1Hz to 10Hz
TIME (MINUTES)
035
12
46
OUTPUT VOLTAGE NOISE (10µV/DIV)
LT1031 • TPC16
10µV (1ppm)
FILTERING = 1 ZERO AT 0.1Hz
2 POLES AT 10Hz
APPLICATIO S I FOR ATIO
WUUU
Trimming Output Voltage
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
current of up to 1.5mA from the LT1031 or 3.5mA from the
–15V supply; however it is necessary to maintain low drift
in the reference. Ground pin current changes in the LT1031,
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, all resistor values in the trim circuit can be raised
proportionately to reduce current drain.
Output Voltage Trimming
LT1031 • TA04
–15V
*CAN BE INCREASED TO 5.6k FOR
LT1031B AND LH0070-2
**INCREASE TO 10Ω FOR LT1031D
R3
50k
R2*
4.3k
R1**
5Ω
V
IN
V
OUT
LT1031
GND
IN OUT
Effect of Reference Drift on System Accuracy
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
TEMPERATURE SPAN (°C)
10
MAXIMUM TEMPERATURE COEFFICIENT FOR
1/2LSB ERROR (ppm/°C)
30
100
1.0
10
20 100
90
807060
50
40
LT1031 • TA03
14-BIT
12-BIT
10-BIT
8-BIT
P1-P3P4-P6P7-P9P10-P12

LH0070-1H

Mfr. #:
Buy LH0070-1H
Manufacturer:
Analog Devices / Linear Technology
Description:
Voltage References LH0070 - Precision 10V Reference
Lifecycle:
New from this manufacturer.
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