Datasheet

2
LT1025
1025fb
PARAMETER CONDITIONS MIN TYP MAX UNITS
Temperature Error at T
J
= 25°C
10mV/°C Output (Notes 4, 5) LT1025A 0.3 0.5 °C
LT1025 0.5 2.0 °C
Full Temperature Span ● See Curve
Resistor Divider Accuracy V
OUT
= 10mV/°C
(Notes 2, 4) LT1025A E 60.6 60.9 61.3 µV/°C
J 51.4 51.7 52.1 µV/°C
K, T 40.3 40.6 41.0 µV/°C
R, S 5.8 5.95 6.2 µV/°C
LT1025 E 60.4 60.9 61.6 µV/°C
J 51.2 51.7 52.3 µV/°C
K, T 40.2 40.6 41.2 µV/°C
R, S 5.75 5.95 6.3 µV/°C
Supply Current 4V ≤ V
IN
≤ 36V 50 80 100 µA
LT1025AC, LT1025C
● 50 150 µA
LT1025AM, LT1025M
● 200 µA
Line Regulation (Note 3) 4V ≤ V
IN
≤ 36V ● 0.003 0.02 °C/V
Load Regulation (Note 3) 0 ≤ I
O
≤ 1mA ● 0.04 0.2 °C
Divider Impedance E 2.5 kΩ
J 2.1 kΩ
K, T 4.4 kΩ
R, S 3.8 kΩ
Change in Supply Current 4V ≤ V
IN
≤ 36V 0.01 0.05 µA/V
(Note 1)
Input Supply Voltage .......................................... 36V
Output Voltage (Forced)........................................ 5V
Output Short-Circuit Duration..................... Indefinite
Operating Temperature Range
LT1025AC, LT1025C ............................0°C to 70°C
LT1025AM, LT1025M .................. – 55°C to 125°C
Storage Temperature Range ............ – 55°C to 150°C
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specificatons are at T
A
= 25°C. V
S
= 5V, Pin 5 tied to Pin 4, unless otherwise noted.
Note 1: Absolute Maximum Ratings are those values beyond which the
life of a device may be impaired.
Note 2: Divider accuracy is measured by applying a 10.000V signal to the
output divider and measuring the individual outputs.
Note 3: Regulation does not include the effects of self-heating. See
“Internal Temperature Rise” in Application Guide. Load regulation is
30µA ≤ I
O
≤ 1mA for T
A
≤ 0°C.
ABSOLUTE AXI U RATI GS
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PACKAGE/ORDER I FOR ATIO
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ELECTRICAL CHARACTERISTICS
Note 4: To calculate total temperature error at individual thermocouple
outputs, add 10mV/°C output error to the resistor divider error. Total error
for type K output at 25°C with an LT1025A is 0.5°C plus (0.4µV/°C)(25°C)/
(40.6µV/°C) = 0.5°C + 0.25°C = 0.75°C.
Note 5: Temperature error is defined as the deviation from the following
formula: V
OUT
= 10mV(T) + (10mV)(5.5 • 10
-4
)(T – 25°C)
2
. The second
term is a built-in nonlinearity designed to help compensate the nonlinearity
of the cold junction . This “bow” is ≈0.34°C for a 25°C temperature change.
1
2
3
4
8
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6
5
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SO
N8 PACKAGE
8-LEAD PDIP
J
51.7µV/°C
K, T
40.6µV/°C
R, S
6µV/°C
R
–
COMMON
E
60.9µV/°C
V
IN
V
O
10mV/°C
GND
ORDER PART
NUMBER
LT1025ACN8
LT1025CN8
LT1025CS8
T
JMAX
= 150°C, θ
JA
= 130°C/W (N8)
T
JMAX
= 150°C, θ
JA
= 190°C/W (S8)
J8 PACKAGE 8-LEAD CERDIP
T
JMAX
= 150°C, θ
JA
= 100°C/W
LT1025AMJ8
LT1025MJ8
OBSOLETE PACKAGE
Consider the N8 Package for Alternate Source
Consult LTC Marketing for parts specified with wider operating temperature ranges.
S8 PART MARKING
1025