TI LT1004ID-2.5

LT1004-1.2, LT1004-2.5
MICROPOWER INTEGRATED VOLTAGE REFERENCES
SLVS022H – JANUARY 1989 – REVISED JULY 1999
D
D
D
D
D
Initial Accuracy
– ±4 mV for LT1004-1.2
– ±20 mV for LT1004-2.5
Micropower Operation
Operates up to 20 mA
Very Low Reference Impedance
Applications:
– Portable Meter Reference
– Portable Test Instruments
– Battery-Operated Systems
– Current-Loop Instrumentation
D PACKAGE
(TOP VIEW)
NC
NC
NC
ANODE
1
8
2
7
3
6
4
5
CATHODE
NC
CATHODE
NC
NC – No internal connection
Terminals 6 and 8 are internally connected.
LP PACKAGE
(TOP VIEW)
description
ANODE
The LT1004 micropower voltage reference is a
two-terminal band-gap reference diode designed
to provide high accuracy and excellent
temperature characteristics at very low operating
currents. Optimizing the key parameters in the
design, processing, and testing of the device
results in specifications previously attainable only
with selected units.
CATHODE
The LT1004 is a pin-for-pin replacement for the LM285 and LM385 series of references, with improved
specifications. It is an excellent device for use in systems in which accuracy was previously attained at the
expense of power consumption and trimming.
The LT1004C is characterized for operation from 0°C to 70°C. The LT1004I is characterized for operation from
–40°C to 85°C.
symbol
ANODE
(A)
CATHODE
(K)
AVAILABLE OPTIONS
PACKAGED DEVICES
TA
0°C to 70°C
–40°C
40°C to 85°C
VZ
TYP
SMALL
OUTLINE
(D)
PLASTIC
(LP)
CHIP
FORM
(Y)
1.2 V
LT1004CD-1.2
LT1004CLP-1.2
LT1004Y-1.2
2.5 V
LT1004CD-2.5
LT1004CLP-2.5
LT1004Y-2.5
1.2 V
LT1004ID-1.2
LT1004ILP-1.2
—
2.5 V
LT1004ID-2.5
LT1004ILP-2.5
—
For ordering purposes, the decimal point in the part number must be replaced with
a hyphen (e.g., show the -1.2 suffix as -1-2 and the -2.5 suffix as -2-5). The D
package is available taped and reeled. Add the R suffix to the device type (e.g.,
LT1004CDR-1-2). Chip forms are tested at 25°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright  1999, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303
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1
LT1004-1.2, LT1004-2.5
MICROPOWER INTEGRATED VOLTAGE REFERENCES
SLVS022H – JANUARY 1989 – REVISED JULY 1999
schematic
LT1004-1.2
CATHODE
Q12
7.5 kΩ
Q3
200 kΩ
Q11
Q4
Q2
Q10
Q1
20 pF
20 pF
50 kΩ
Q9
600 kΩ
300 kΩ
500 kΩ
Q5
Q8
500 Ω Q6
Q13
Q7
60 kΩ
ANODE
LT1004-2.5
CATHODE
Q12
7.5 kΩ
200 kΩ
Q11
Q3
Q4
Q2
500 kΩ
Q10
Q1
20 pF
20 pF
50 kΩ
600 kΩ
Q9
300 kΩ
500 kΩ
Q5
Q8
500 Ω
Q6
Q13
Q7
500 kΩ
60 kΩ
ANODE
NOTE A: All component values shown are nominal.
2
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LT1004-1.2, LT1004-2.5
MICROPOWER INTEGRATED VOLTAGE REFERENCES
SLVS022H – JANUARY 1989 – REVISED JULY 1999
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Reverse current, IR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 mA
Forward current, IF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mA
Package thermal impedance, θJA (see Notes 1 and 2): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97°C/W
LP package . . . . . . . . . . . . . . . . . . . . . . . . . . 156°C/W
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable
ambient temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can impact reliability.
2. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace
length of zero.
recommended operating conditions
LT1004C
Operating free
free-air
air temperature
temperature, TA
LT1004I
MIN
MAX
0
70
–40
85
UNIT
°C
electrical characteristics at specified free-air temperature
PARAMETER
VZ
aV
Reference voltage
Z
∆VZ
TEST
CONDITIONS
IZ = 100 µA
Full
range
Average
temperature coefficient
of reference voltage§
IZ = 10 µA
Change in
reference voltage
with current
IZ = IZ(min) to 1 mA
LT1004-1.2
LT1004-2.5
TA‡
MIN
TYP
MAX
MIN
TYP
MAX
25°C
1.231
1.235
2.5
2.52
1.239
2.48
LT1004C
1.225
1.245
2.47
2.53
LT1004I
1.225
1.245
2.47
2.53
UNIT
V
20
25°C
IZ = 20 µA
ppm/°C
20
IZ = 1 mA to 20 mA
∆VZ/∆t
Long-term change
in reference voltage
IZ(min)
Minimum
reference current
zz
Reference impedance
IZ = 100 µA
Vn
Broadband
noise voltage
IZ = 100 µA,
f = 10 Hz to 10 kHz
IZ = 100 µA
25°C
1
1
Full range
1.5
1.5
25°C
10
10
Full range
20
20
25°C
20
Full range
8
10
12
20
0.2
0.6
0.2
0.6
25°C
Full range
25°C
20
1.5
60
ppm/khr
1.5
120
mV
µA
Ω
µV
‡ Full range is 0°C to 70°C for the LT1004C and –40°C to 85°C for the LT1004I.
§ The average temperature coefficient of reference voltage is defined as the total change in reference voltage divided by the specified temperature
range.
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3
LT1004-1.2, LT1004-2.5
MICROPOWER INTEGRATED VOLTAGE REFERENCES
SLVS022H – JANUARY 1989 – REVISED JULY 1999
electrical characteristics, TA = 25°C
VZ
aV
IZ = 100 µA
IZ = 10 µA
Reference voltage
Z
LT1004Y-1.2
TEST
CONDITIONS
PARAMETER
Average
g temperature coefficient
of reference voltage†
∆VZ/∆t
IZ(min)
Long-term change in reference voltage
zz
Reference impedance
Vn
Broadband noise voltage
LT1004Y-2.5
MIN
TYP
MAX
MIN
TYP
MAX
1.231
1.235
1.239
2.48
2.5
2.52
20
IZ = 20 µA
IZ = 100 µA
IZ = 100 µA
IZ = 100 µA,
f = 10 Hz to 10 kHz
V
ppm/°C
20
Minimum reference current
UNIT
20
20
ppm/khr
8
12
µA
0.2
0.6
60
0.2
120
0.6
Ω
µV
† The average temperature coefficient of reference voltage is defined as the total change in reference voltage divided by the specified temperature
range.
TYPICAL CHARACTERISTICS
Table of Graphs
GRAPH TITLE
FIGURE
LT1004x-1.2
Reverse current vs Reverse voltage
1
Reference-voltage change vs Reverse current
2
Forward voltage vs Forward current
3
Reference voltage vs Free-air temperature
4
Reference impedance vs Reference current
5
Noise voltage vs Frequency
6
Filtered output noise voltage vs Cutoff frequency
7
LT1004x-2.5
Transient response
4
8
Reverse current vs Reverse voltage
9
Forward voltage vs Forward current
10
Reference voltage vs Free-air temperature
11
Reference impedance vs Reference current
12
Noise voltage vs Frequency
13
Filtered output noise voltage vs Cutoff frequency
14
Transient response
15
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LT1004-1.2, LT1004-2.5
MICROPOWER INTEGRATED VOLTAGE REFERENCES
SLVS022H – JANUARY 1989 – REVISED JULY 1999
TYPICAL CHARACTERISTICS†
100
LT1004x-1.2
LT1004x-1.2
REVERSE CURRENT
vs
REVERSE VOLTAGE
REFERENCE-VOLTAGE CHANGE
vs
REVERSE CURRENT
ÎÎÎÎÎÎ
ÎÎÎÎÎÎ
TA = –55°C to 125°C
∆V Z – Reference Voltage Change – mV
I R – Reverse Current – µ A
TA = –55°C to 125°C
10
1
0.2
0.4
0.6
0.8
1
1.2
12
8
4
0
–4
0.01
0.1
0
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
16
1.4
0.1
Figure 1
LT1004x-1.2
LT1004x-1.2
FORWARD VOLTAGE
vs
FORWARD CURRENT
REFERENCE VOLTAGE
vs
FREE-AIR TEMPERATURE
ÎÎÎ
1.245
ÎÎÎÎ
ÎÎÎÎ
IZ = 100 µA
V Z – Reference Voltage – V
V F – Forward Voltage – V
100
Figure 2
TA = 25°C
1
10
IR – Reverse Current – mA
VR – Reverse Voltage – V
1.2
1
0.8
0.6
0.4
1.24
1.235
1.23
0.2
1.225
0
0.01
0.1
1
10
100
–55 –35 –15
5
25
45
65
85
105 125
TA – Free-Air Temperature – °C
IF – Forward Current – mA
Figure 3
Figure 4
†Data at high and low temperatures are applicable only within the rated operating free-air temperature ranges of the various devices.
POST OFFICE BOX 655303
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5
LT1004-1.2, LT1004-2.5
MICROPOWER INTEGRATED VOLTAGE REFERENCES
SLVS022H – JANUARY 1989 – REVISED JULY 1999
TYPICAL CHARACTERISTICS†
LT1004x-1.2
LT1004x-1.2
REFERENCE IMPEDANCE
vs
REFERENCE CURRENT
NOISE VOLTAGE
vs
FREQUENCY
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
100
ÎÎÎÎÎ
ÎÎÎÎÎ
700
600
Vn – Noise Voltage – nV/ Hz
z z – Reference Impedance – Ω
f = 25 Hz
TA = –55°C to 125°C
10
1
IZ = 100 µA
TA = 25°C
500
400
300
200
100
0.1
0.01
0.1
1
10
0
10
100
100
1k
10 k
100 k
f – Frequency – Hz
IZ – Reference Current – mA
Figure 5
Figure 6
TL1004x-1.2
FILTERED OUTPUT NOISE VOLTAGE
vs
CUTOFF FREQUENCY
60
50
ÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎ ÎÎÎÎÎ
40
IZ = 100 µA
TA = 25°C
100 µA
R
C
30
20
10
0
0.1
2
RC Low Pass
Input and Output Voltages – V
Filtered Output Noise Voltage – µV
70
LT1004x-2.5
TRANSIENT RESPONSE
ÎÎÎ
1.5
Output
1
36 kΩ
VI
0.5
0
ÎÎÎ
5
Input
0
1
10
VO
100
0
100
500
t – Time – µs
Cutoff Frequency – kHz
Figure 7
Figure 8
†Data at high and low temperatures are applicable only within the rated operating free-air temperature ranges of the various devices.
6
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600
LT1004-1.2, LT1004-2.5
MICROPOWER INTEGRATED VOLTAGE REFERENCES
SLVS022H – JANUARY 1989 – REVISED JULY 1999
TYPICAL CHARACTERISTICS†
100
LT1004x-2.5
LT1004x-2.5
REVERSE CURRENT
vs
REVERSE VOLTAGE
FORWARD VOLTAGE
vs
FORWARD CURRENT
ÎÎÎÎ
ÎÎÎÎ
1.2
ÎÎÎÎÎÎÎ
TA = 25°C
1
V F – Forward Voltage – V
I R – Reverse Current – µ A
TA = –55°C to 125°C
10
1
0.8
0.6
0.4
0.2
0
0.1
0
0.5
1
1.5
2
2.5
0.1
0.01
3
VR – Reverse Voltage – V
1
10
100
IF – Forward Current – mA
Figure 9
Figure 10
LT1004x-2.5
REFERENCE VOLTAGE
vs
FREE-AIR TEMPERATURE
ÎÎÎÎÎ
ÎÎÎÎÎ
2.52
IZ = 100 µA
V Z – Reference Voltage – V
2.515
2.51
2.505
2.5
2.495
2.49
2.485
2.48
2.475
–55 –35 –15
5
25
45
65
85
105 125
TA – Free-Air Temperature – °C
Figure 11
†Data at high and low temperatures are applicable only within the rated operating free-air temperature ranges of the various devices.
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7
LT1004-1.2, LT1004-2.5
MICROPOWER INTEGRATED VOLTAGE REFERENCES
SLVS022H – JANUARY 1989 – REVISED JULY 1999
TYPICAL CHARACTERISTICS†
LT1004x-2.5
LT1004x-2.5
REFERENCE IMPEDANCE
vs
REFERENCE CURRENT
NOISE VOLTAGE
vs
FREQUENCY
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
1400
1000
1200
100
Vn – Noise Voltage – nV/ Hz
z z – Reference Impedance – Ω
f = 25 Hz
TA = –55°C to 125°C
10
1
ÎÎÎÎÎ
ÎÎÎÎÎ
IZ = 100 µA
TA = 25°C
1000
800
600
400
200
0.1
0.01
0.1
1
10
0
10
100
100
1k
10 k
f – Frequency – Hz
IZ – Reference Current – mA
Figure 12
Figure 13
TL1004x-2.5
FILTERED OUTPUT NOISE VOLTAGE
vs
CUTOFF FREQUENCY
LT1004x-2.5
TRANSIENT RESPONSE
ÎÎÎÎÎ
ÎÎÎÎÎ ÎÎÎÎÎ
ÎÎÎÎÎ
IZ = 100 µA
TA = 25°C
4
100
Input and Output Voltages – V
Filtered Output Noise Voltage –µV
120
RC Low Pass
80
100 µA
R
60
C
40
20
3
Output
2
24 kΩ
VI
1
VO
0
5
Input
0
0
0.1
1
10
100
0
100
500
t – Time – µs
Cutoff Frequency – kHz
Figure 14
Figure 15
†Data at high and low temperatures are applicable only within the rated operating free-air temperature ranges of the various devices.
8
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100 k
LT1004-1.2, LT1004-2.5
MICROPOWER INTEGRATED VOLTAGE REFERENCES
SLVS022H – JANUARY 1989 – REVISED JULY 1999
APPLICATION INFORMATION
100 pF
24 V
24 V
600 µs RC
+
22 kΩ
Output
LM301A
12 kΩ
21 V
–
16.9 kن
LT1004-1.2
–5 V
0.05 µF
1.05 kن
10 kΩ
2N3904
TTL Input
56 kΩ
–5 V
† 1% metal-film resistors
Figure 16. VI(PP) Generator for EPROMs (No Trim Required)
Network Detail
YSI 44201
RT Network
YSI 44201
15 V
6250 Ω
Red
2.7 kΩ
5%
–
10 kΩ
0.1%
LT1004-1.2
Brown
Green
1/2
TLE2022
2765 Ω
0.1%
302 kΩ
+
1/2
TLE2022
+
0–10 V
0°C–100°C
–
10 kΩ
0.1%
168.3 Ω
0.1%
10 kΩ
0.1%
Figure 17. 0°C-to-100°C Linear-Output Thermometer
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9
LT1004-1.2, LT1004-2.5
MICROPOWER INTEGRATED VOLTAGE REFERENCES
SLVS022H – JANUARY 1989 – REVISED JULY 1999
APPLICATION INFORMATION
VI = 6.5 V to 15 V
V+
R
LM334
V–
5.6 kΩ
3
7
8
+
TLC271
2
6
VO = 5 V
–
4
LT1004-1.2
3.01 MΩ
1%
150 pF
1 MΩ
1%
Figure 18. Micropower 5-V Reference
VI ≥ 5 V
9V
100 µA
22 Ω
510 kΩ
Output
+
1.235 V
50 µF
LT1004-1.2
LT1004-1.2
Figure 19. Low-Noise Reference
Figure 20. Micropower Reference From 9-V Battery
†
100 kΩ
R1
1684 Ω
3 V,
Lithium
5 kΩ at 25°C‡
THERMOCOUPLE
TYPE
R1
+
J
K
T
S
232 kΩ
298 kΩ
301 kΩ
2.1 MΩ
LT1004-1.2
187 Ω
1800 Ω
+
–
–
† Quiescent current ≅ 15 µA
‡ Yellow Springs Inst. Co., Part #44007
NOTE A: This application compensates within ±1°C from 0°C to 60°C.
Figure 21. Micropower Cold-Junction Compensation for Thermocouples
10
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LT1004-1.2, LT1004-2.5
MICROPOWER INTEGRATED VOLTAGE REFERENCES
SLVS022H – JANUARY 1989 – REVISED JULY 1999
APPLICATION INFORMATION
LT1084
VI ≥ 8 V
IN
5V
OUT
5V
+
ADJ
10 µF
50 kΩ
10 µF
+
301 Ω
1%
LT1004-2.5
2.5 V
100 Ω
1%
LT1004-2.5
Figure 22. 2.5-V Reference
Figure 23. High-Stability 5-V Regulator
VCC+ ≥ 5 V
250 kΩ
15 V
250 kΩ
2 kن
Output
LT1004-1.2
Input
–
R1
(see Note A)
TLE2027
2N3904
+
IO (see Note A)
200 kΩ
–5 V
LT1004-1.2
60 kΩ
† May be increased for small output currents
NOTE A: R1 ≈
VCC– ≤ –5 V
2V
1.235 V
,I =
IO + 10 µA O
R1
Figure 24. Ground-Referenced Current Source
Figure 25. Amplifier With Constant Gain
Over Temperature
V+
LM334
1.5 V (see Note A)
R
6.8 kΩ
3 kΩ
R ≤ 5 kΩ
1.235 V
LT1004-1.2
LT1004-1.2
IO ≈
NOTE A: Output regulates down to 1.285 V for IO = 0.
Figure 26. 1.2-V Reference From 1.5-V Battery
POST OFFICE BOX 655303
1.3 V
R
Figure 27. Terminal Current Source
With Low Temperature Coefficient
• DALLAS, TEXAS 75265
11
LT1004-1.2, LT1004-2.5
MICROPOWER INTEGRATED VOLTAGE REFERENCES
SLVS022H – JANUARY 1989 – REVISED JULY 1999
APPLICATION INFORMATION
Battery Output
R1†
1%
1 MΩ
12 V
+
TLC271
–
LO = Battery Low
133 kΩ
1%
LT1004-1.2
†R1 sets trip point, 60.4 kΩ per cell for 1.8 V per cell
Figure 28. Lead-Acid Low-Battery-Voltage Detector
LT1084
VI
VI
10 µF
VO
+
ADJ
VO
120 Ω
+
LT1004-1.2
R1 ≤
VCC – 1 V
0.015
R1
2 kΩ
VCC–
Figure 29. Variable-Voltage Supply
12
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10 µF
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accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
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Copyright  1999, Texas Instruments Incorporated