LT1004
Micropower Voltage
Reference
FEATURES
s
s
s
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DESCRIPTION
The LT
®
1004 Micropower Voltage Reference is a
2-terminal bandgap reference diode designed to provide
high accuracy and excellent temperature characteristics at
very low operating currents. Optimization of the key
parameters in the design, processing and testing of the
device results in accuracy specifications previously attain-
able only with selected units. Below is a distribution plot of
reference voltage for a typical lot of LT1004-1.2. Virtually
all of the units fall well within the prescribed limits of
±4mV.
The LT1004 is a pin-for-pin replacement for the
LM185/LM385 series of references with improved accu-
racy specifications. More important, the LT1004 is an
attractive device for use in systems where accuracy was
previously obtained at the expense of power consump-
tion and trimming.
For a low drift micropower reference with guaranteed
temperature coefficient, see the LT1034 data sheet.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Guaranteed
±4mV
Initial Accuracy LT1004-1.2
Guaranteed
±20mV
Accuracy LT1004-2.5
Guaranteed
10µA Operating Current
Guaranteed
Temperature Performance
Operates up to 20mA
Very Low Dynamic Impedance
APPLICATIONS
s
s
s
s
Portable Meter References
Portable Test Instruments
Battery-Operated Systems
Current Loop Instrumentation
TYPICAL APPLICATION
Micropower Cold Junction Compensation for Thermocouples
200
100k
3V
LITHIUM
LT1004-1.2
186Ω
1.8k
*
R1
1684Ω
5k AT
25°C
†
Typical Distribution of
Reference Voltage (LT1004-1.2)
180
160
1200 PARTS
T
A
= 25°C
NUMBER OF PARTS
140
120
100
80
60
40
+
+
–
THERMOCOUPLE
TYPE
J
K
T
S
R
1
233k
299k
300k
2.1M
–
* QUIESCENT CURRENT
≅
15µA
† YELLOW SPRINGS INST. CO.
PART #44007
COMPENSATES WITHIN
±1°C
FROM 0°C TO 60°C
1004 TA01
20
1.2325
1.2335
1.2345
1.2355
1.2365
1004 TA02
1.2375
1.233
1.234
1.235
1.236
1.237
U
U
U
1
LT1004
ABSOLUTE
MAXIMUM
RATINGS
(Note 1)
PACKAGE/ORDER INFORMATION
BOTTOM VIEW
Reverse Breakdown Current ................................. 30mA
Forward Current................................................... 10mA
Operating Temperature Range
LT1004M ......................................... – 55°C to 125°C
LT1004I ............................................. – 40°C to 85°C
LT1004C ................................................. 0°C to 70°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec.)................ 300°C
ORDER PART
NUMBER
T
JMAX
= 150°C
θ
JA
= 440°C/ W
θ
JC
= 80°C/ W
1
2
H PACKAGE
2-LEAD TO-46 METAL CAN
LT1004MH-1.2
LT1004MH-2.5
LT1004CH-1.2
LT1004CH-2.5
LT1004CZ-1.2
LT1004CZ-2.5
LT1004IZ-1.2
LT1004IZ-2.5
LT1004CS8-1.2
LT1004CS8-2.5
LT1004IS8-1.2
LT1004IS8-2.5
S8 PART MARKING
0412
0425
0412I
0425I
BOTTOM VIEW
3
2
1
T
JMAX
= 100°C
θ
JA
= 160°C/ W
Z PACKAGE
3-LEAD PLASTIC TO-92
TOP VIEW
NC 1
NC 2
NC 3
GND 4
8 V
OUT
7 NC
6 V
OUT
5 NC (DO NOT USE)
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 100°C,
θ
JA
= 150°C/ W
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
V
Z
Reverse Breakdown Voltage
(Note 2)
LT1004-1.2
MIN
TYP
MAX
1.231 1.235 1.239
1.220 1.230 1.245
1.225 1.235 1.245
1.220 1.230 1.245
50
q
CONDITIONS
I
R
= 100µA
LT1004M: – 55°C
≤
T
A
≤
125°C
LT1004C: 0°C
≤
T
A
≤
70°C
LT1004I: – 40°C
≤
T
A
≤
85°C
I
MIN
≤
I
R
≤
20mA (Note 3)
q
q
q
LT1004-2.5
MIN
TYP
MAX
2.480 2.500 2.520
2.460 2.500 2.535
2.470 2.500 2.530
2.460 2.500 2.530
50
UNITS
V
V
V
V
ppm/°C
∆V
Z
∆Temp
I
MIN
∆V
Z
∆I
R
Average Temperature Coefficient
Minimum Operating Current
Reverse Breakdown Voltage
Change with Current
8
10
1.0
1.5
10
20
12
20
1.0
1.5
10
20
I
MIN
≤
I
R
≤
1mA
q
1mA
≤
I
R
≤
20mA
q
r
Z
e
n
∆V
Z
∆Time
Reverse Dynamic Impedance
Wide Band Noise (RMS)
Long Term Stability
I
R
= 100µA
q
0.2
0.6
1.5
0.2
0.6
1.5
I
R
= 100µA
10Hz
≤
f
≤
10kHz
I
R
= 100µA
T
A
= 25°C
±
0.1°C
60
20
120
20
ppm/kHr
The
q
denotes the specifications which apply over the full operating
temperature range.
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
All specifications are for T
A
= 25°C unless otherwise noted.
Note 3:
Selected devices with guaranteed maximum temperature
coefficient are available upon request.
For MIL-STD components, please refer to LTC 883C data sheet for test
listing and parameters.
2
U
W
U
U
W W
W
µA
mV
mV
mV
mV
Ω
Ω
µV
LT1004
TYPICAL PERFORMANCE CHARACTERISTICS (1.2V)
Reverse Characteristics
100
–55°C TO 125°C
OUTPUT VOLTAGE CHANGE (mV)
REVERSE CURRENT (µA)
10
FORWARD VOLTAGE (V)
1
0.1
0
0.2
0.4 0.6 0.8
1.0
REVERSE VOLTAGE (V)
1.2
1.4
Temperature Drift
1.245
100
DYNAMIC IMPEDANCE (Ω)
10
DYNAMIC IMPEDANCE (Ω)
1.240
REVERSE VOLTAGE (V)
1.235
1.230
1.225
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1004 G04
Noise Voltage
700
600
500
NOISE (nV/√Hz)
I
R
= 100µA
T
A
= 25°C
NOISE (nV/√Hz)
400
300
200
100
0
10
100
1k
10k
FREQUENCY (Hz)
100k
1004 G07
40
30
20
10
0
100
VOLTAGE (V)
U W
1004 G01
Reverse Voltage Change
16
–55°C TO 125°C
12
0.8
1.2
Forward Characteristics
T
A
= 25°C
8
4
0.4
0
–4
0.01
1
10
0.1
REVERSE CURRENT (mA)
100
1004 G02
0
0.01
0.1
1
10
FORWARD CURRENT (mA)
100
1004 G11
Reverse Dynamic Impedance
10k
–55°C TO 125°C
f = 25Hz
Reverse Dynamic Impedance
T
A
= 25°C
I
R
= 100µA
1k
100
10
1
1
0.1
0.01
0.1
1
10
REVERSE CURRENT (mA)
100
1004 G05
0.1
10
100
10k
1k
FREQUENCY (Hz)
100k
1M
1004 G06
Filtered Output Noise
70
I
R
= 100µA
60
50
100µA
R
C
RC LOW PASS
1.5
1.0
Reponse Time
OUTPUT
36k
0.5
0
V
IN
V
OUT
5V
INPUT
0
1k
10k
FREQUENCY (Hz)
100k
1004 G08
0
100
TIME (µs)
500
600
1004 G09
3
LT1004
TYPICAL PERFORMANCE CHARACTERISTICS (2.5V)
Reverse Characteristics
100
–55°C TO 125°C
REVERSE CURRENT (µA)
FORWARD VOLTAGE (V)
10
1
0.1
0
0.5
Temperature Drift
1000
2.515
DYNAMIC IMPEDANCE (Ω)
100
2.505
2.500
2.495
2.490
2.485
2.480
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1004 G12
DYNAMIC IMPEDANCE (Ω)
REFERENCE VOLTAGE (V)
2.510
Noise Voltage
1400
I
R
= 100µA
1200
100
120
INTEGRATED NOISE (µV)
1000
NOISE (nV/√Hz)
800
600
400
200
0
10
100
1k
10k
FREQUENCY (Hz)
100k
1004 G15
VOLTAGE (V)
4
U W
Forward Characteristics
1.2
T
A
= 25°C
0.8
0.4
1.0
1.5
2.0
REVERSE VOLTAGE (V)
2.5
3.0
1004 G10
0
0.01
0.1
1
10
FORWARD CURRENT (mA)
100
1004 G11
Reverse Dynamic Impedance
10k
Reverse Dynamic Impedance
T
A
= 25°C
I
R
= 100µA
1k
f = 25Hz
–55°C TO 125°C
100
10
10
1
1
0.1
0.01
0.1
1
10
0.1
REVERSE CURRENT (mA)
100
1004 G13
10
100
10k
1k
FREQUENCY (Hz)
100k
1M
1004 G14
Filtered Output Noise
I
R
= 100µA
100µA
R
C
60
40
20
0
100
3
2
1
0
Reponse Time
80
RC LOW PASS
OUTPUT
24k
V
OUT
V
IN
5V
INPUT
0
1k
10k
CUTOFF FREQUENCY (Hz)
100k
1004 G16
100
TIME (µs)
500
1004 G17
LT1004
TYPICAL APPLICATIONS
High Stability 5V Regulator
LT1338A
V
IN
≥
8V
IN
OUT
ADJ
300Ω
1%
LT1004-2.5
LT1004-1.2
100Ω
1%
1004 TA03
+
1µF
Constant Gain Amplifier
Over Temperature
V
+
≥
5V
250k
250k
INPUT
2N3904
200k
LT1004-1.2
60k
V
–
≤
–5V
1004 TA07
Lead Acid Low Battery Detector
BATTERY
OUTPUT
R1
†
1%
1M
3
12V
+
–
7
LM4250
6
8
4
10M
LO = BATTERY LOW
133k
1%
2
LT
1004-1.2
†
R1 SETS TRIP POINT, 60.4k
PER CELL FOR 1.8V/CELL
U
Variable Output Supply
LT338A
5V
V
IN
V
IN
V
OUT
ADJ
120Ω
V
OUT
+
1µF
+
10µF
1004 TA08
2k
R1
R1
≤
V
–
– 1V
0.015
V
–
Micropower 5V Reference
V
IN
9V to 15V
LM334
R
OUTPUT
5.6k
3
+
–
4
7
LM4250
6
8
22M
150pF
V
OUT
5V
3.01M
1%
2
LT1004-1.2
1M
1%
1004 TA13
Ground Referenced Current Source
15V
2k*
LT1004-1.2
R
2
–
+
4
7
6
I
OUT
=
1004 TA04
LT1007C
3
1004 TA14
I
OUT
–5V
1.235
R
2V
R
≈
I
OUT
+ 10µA
* MAY BE INCREASED
FOR SMALL OUTPUT CURRENTS
5
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