LT1025_15 Datasheet, PDF (2/12 Pages) Linear Technology – Micropower Thermocouple Cold Junction Compensator

LT1025
ABSOLUTE AXI U RATI GS
(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
UW U
PACKAGE/ORDER I FOR ATIO
E
60.9µV/°C
1
V_IN 2
V_O
10mV/°C
3
GND 4
TOP VIEW
8
J
51.7µV/°C
7
K, T
40.6µV/°C
6
5
R, S
6Rµ_–V/°C
COMMON
ORDER PART
NUMBER
LT1025ACN8
LT1025CN8
LT1025CS8
N8 PACKAGE
S8 PACKAGE
8-LEAD PDIP 8-LEAD PLASTIC SO
T_JMAX = 150°C, θ_JA = 130°C/W (N8)
T_JMAX = 150°C, θ_JA = 190°C/W (S8)
S8 PART MARKING
1025
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.
ELECTRICAL CHARACTERISTICS _{The q 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.
PARAMETER
Temperature Error at
10mV/°C Output (Notes 4, 5)
Resistor Divider Accuracy
(Notes 2, 4)
Supply Current
Line Regulation (Note 3)
Load Regulation (Note 3)
Divider Impedance
Change in Supply Current
CONDITIONS
T_J = 25°C
LT1025A
LT1025
Full Temperature Span
V_OUT = 10mV/°C
LT1025A
E
J
K, T
R, S
LT1025
E
J
K, T
R, S
4V ≤ V_IN ≤ 36V
LT1025AC, LT1025C
LT1025AM, LT1025M
4V ≤ V_IN ≤ 36V
0 ≤ I_O ≤ 1mA
E
J
K, T
R, S
4V ≤ V_IN ≤ 36V
MIN
TYP
MAX
UNITS
0.3
0.5
°C
0.5
2.0
°C
q
See Curve
60.6
51.4
40.3
5.8
60.4
51.2
40.2
5.75
50
q 50
q
q
q
60.9
51.7
40.6
5.95
60.9
51.7
40.6
5.95
80
0.003
0.04
2.5
2.1
4.4
3.8
0.01
61.3
µV/°C
52.1
µV/°C
41.0
µV/°C
6.2
µV/°C
61.6
µV/°C
52.3
µV/°C
41.2
µV/°C
6.3
µV/°C
100
µA
150
µA
200
µA
0.02
°C/V
0.2
°C
kΩ
kΩ
kΩ
kΩ
0.05
µA/V
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.
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.
1025fb
2