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參數(shù)資料
| 型號： | LT1031DCH#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 10 V, MBCY3 |
| 封裝： | METAL CAN, TO-39, 3 PIN |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 156K |
| 代理商： | LT1031DCH#PBF |
6
LT1031/LH0070
1031fb
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Output Noise 0.1Hz to 10Hz
TIME (MINUTES)
03
5
12
46
OUTPUT
VOLTAGE
NOISE
(10
V/DIV)
LT1031 TPC16
10
V (1ppm)
FILTERING = 1 ZERO AT 0.1Hz
2 POLES AT 10Hz
APPLICATIO S I FOR ATIO
WU
UU
Trimming Output Voltage
The LT1031 output can be trimmed by driving the ground
pin. The suggested method is shown in the illustration
below. A 5
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 4
A/°C. This,
coupled with the 5
external resistor, creates up
to 2ppm/
°C drift in the reference (5 4A/°C = 20V/°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 10
FOR LT1031D
R3
50k
R2*
4.3k
R1**
5
VIN
VOUT
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
80
70
60
50
40
LT1031 TA03
14-BIT
12-BIT
10-BIT
8-BIT
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