LT1034-1.2/LT1034-2.5
Micropower Dual
Reference
FEATURES
s
s
s
s
s
DESCRIPTIO
Guaranteed 20 ppm/
°
C Drift
Guaranteed 40 ppm/
°
C Drift (SO-8 Package)
20
µ
A to 20mA Operation (1.2V)
Dynamic Impedance: 1Ω
7V, 100µA Reference
APPLICATIO S
s
s
s
Portable Meters
Precision Regulators
Calibrators
The LT
®
1034 is a micropower, precision 1.2V/2.5 refer-
ence combined with a 7V auxiliary reference. The 1.2V/2.5V
reference is a trimmed, thin-film, band-gap, voltage refer-
ence with 1% initial tolerance and guaranteed 20ppm/°C
temperature drift. Operating on only 20µA, the LT1034
offers guaranteed drift, low temperature cycling hyster-
esis and good long-term stability. The low dynamic im-
pedance makes the LT1034 easy to use from unregulated
supplies. The 7V reference is a subsurface zener device for
less demanding applications.
The LT1034 reference can be used as a high performance
upgrade of the LM385 or LT1004, where guaranteed
temperature drift is desired.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
15V
Temperature Drift LT1034CS8-1.2
2.5
2.0
REVERSE VOLTAGE CHANGE (mV)
50k
500k
1.2V OR 2.5V
OUTPUT
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
7V OUTPUT
7V
1.225V
OR 2.500V
LT1034 • TA01
–2.5
–50 –25
U
50
25
0
75
TEMPERATURE (°C)
100
125
LT1034 • TPC02
U
U
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1
LT1034-1.2/LT1034-2.5
ABSOLUTE
MAXIMUM
RATINGS
Operating Current ................................................. 20mA
Forward Current (Note 2) ..................................... 20mA
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
BOTTOM VIEW
1.2V
7V
ORDER PART NUMBER
LT1034BCH-1.2
LT1034BCH-2.5
LT1034BMH-1.2
LT1034BMH-2.5
LT1034CH-1.2
LT1034CH-2.5
LT1034MH-1.2
LT1034MH-2.5
H PACKAGE
3-LEAD TO-46 METAL CAN
T
JMAX
= 150°C,
θ
JA
= 440°C/ W,
θ
JC
= 80°C/ W
OBSOLETE PACKAGE
Consider the Z Package for Alternate Source
BOTTOM VIEW
1.2V
7V
ORDER PART NUMBER
LT1034BCZ-1.2
LT1034BCZ-2.5
LT1034BIZ-1.2
LT1034BIZ-2.5
LT1034CZ-1.2
LT1034CZ-2.5
LT1034IZ-1.2
LT1034IZ-2.5
Z PACKAGE
3-LEAD TO-92 PLASTIC
T
JMAX
= 100°C,
θ
JA
= 160°C/ W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
2
U
U
W
W W
U
W
(Note 1)
Operating Temperature
Commercial ............................................. 0° to 70°C
Industrial .......................................... – 40°C to 85°C
Military
(OBSOLETE) .................
– 55°C to 125°C
ORDER PART
NUMBER
TOP VIEW
NC 1
NC 2
NC 3
GND 4
8
7
6
5
2.5V
NC
2.5V
7V
LT1034CS8-1.2
LT1034CS8-2.5
LT1034IS8-1.2
LT1034IS8-2.5
PART MARKING
3401
3402
1034I12
34I02
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 175°C,
θ
JA
= 150°C/ W
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LT1034-1.2/LT1034-2.5
The
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER
Reverse Breakdown Voltage
Reverse Breakdown Change
with Current
CONDITIONS
I
R
= 100µA
q
ELECTRICAL CHARACTERISTICS
(Note 4)
q
2mA
≤
I
R
≤
20mA
q
Minimum Operating Current
Temperature Coefficient
Reverse Dynamic Impedance (Note 3)
Low Frequency Noise
Long-Term Stability
q
I
R
= 100µA
I
R
= 100µA
LT1034B
LT1034
q
q
I
R
= 100µA, 0.1Hz
≤
F
≤
10Hz
I
R
= 100µA
q
LT1034-1.2
MIN TYP
MAX
1.210 1.225 1.240
1.205 1.225 1.245
0.5
2.0
1.0
4.0
4.0
8.0
6.0
15.0
10
20
10
20
20
40
0.25
1.0
0.50
2.0
4
20
LT1034-2.5
MIN
TYP
MAX
2.46
2.5
2.54
2.43
2.5
2.57
1.0
3.0
1.5
6.0
6.0
16.0
10.0
20.0
15
30
10
20
20
40
0.5
1.5
1.0
2.5
6
20
UNITS
V
V
mV
mV
mV
mV
µA
ppm/°C
ppm/°C
Ω
Ω
µV
P-P
ppm/√khrs
The
q
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
7V Reference.
PARAMETER
Reverse Breakdown Voltage
Reverse Breakdown Change
with Current
CONDITIONS
I
R
= 100µA
q
MIN
6.80
6.75
Temperature Coefficient
Long-Term Stability
100µA
≤
I
R
≤
1mA
100µA
≤
I
R
≤
1mA
1mA
≤
I
R
≤
20mA
1mA
≤
I
R
≤
20mA
I
R
= 100µA
I
R
= 100µA
q
q
q
TYP
7.0
7.0
90
100
160
200
40
20
MAX
7.3
7.4
140
190
250
350
UNITS
V
V
mV
mV
mV
mV
ppm/°C
ppm/√khrs
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
Forward biasing either diode will affect the operation of the other
diode.
Note 3:
This parameter guaranteed by “reverse breakdown change with
current” test.
Note 4:
For the LT1034-1.2: 20µA
≤
I
R
≤
2mA. For the LT1034-2.5:
30µA
≤
I
R
≤
2mA.
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3
LT1034-1.2/LT1034-2.5
TYPICAL PERFORMANCE CHARACTERISTICS
Reverse Voltage Change 1.2V
8
T
A
= –55°C TO 125°C
REVERSE VOLTAGE CHANGE (mV)
6
1.2V
4
REVERSE VOLTAGE CHANGE(V)
2µV/DIV
2
0
–2
0.01
0.1
1
10
REVERSE CURRENT (mA)
Reverse Dynamic Impedance 1.2V
100
REVERSE DYNAMIC IMPEDANCE (Ω)
60
REVERSE DYNAMIC IMPEDANCE (Ω)
50
40
30
20
10
0
0.01
1.2V
10
REVERSE DYNAMIC IMPEDANCE (Ω)
T
A
= 25°C
f = 25Hz
1
0.1
0.01
0.1
1
10
REVERSE CURRENT (mA)
4
U W
LT1034 • TPC01
LT1034 • TPC04
Reverse Voltage Change 7V
0.4
T
A
= 25°C
0.3
7V
0.2
11
10
8
6
4
2
0
–2
–4
–6
0
–8
–10
100
–0.1
0.1
1
10
100
LT1034 • TPC02
0.1Hz to 10Hz Noise 1.2V
0.1
–11
0
1
2
3
4
5
REVERSE CURRENT (mA)
6 7
1s/DIV
8
9
10 11 12
LT1034 • TPC03
Reverse Dynamic Impedance 2.5V
100
I
Z
= 100µA
Reverse Dynamic Impedance 7V
T
A
= 25°C
I
Z
= 100µA
10
1.2V
1
100
0.1
1
FREQUENCY (kHz)
10
100
LT1034 • TPC05
0.1
10
100
1k
10k
FREQUENCY (Hz)
100k
LT1034 • TPC06
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LT1034-1.2/LT1034-2.5
TYPICAL PERFORMANCE CHARACTERISTICS
Reverse Characteristics 1.2V
16
T
A
= –55°C TO 125°C
V
REF
= 1.2V
REVERSE CURRENT (µA)
REVERSE CURRENT (mA)
12
10
REVERSE CURRENT (µA)
8
4
0
0
0.8
0.4
1.2
REVERSE VOLTAGE (V)
Forward Characteristics
1.2
T
A
= 25°C
FORWARD VOLTAGE (V)
VOLTAGE (V)
VOLTAGE (V)
0.8
0.4
0
0.01
0.1
1
10
FORWARD CURRENT (mA)
LT1034 • TPC10
U W
LT1034 • TPC07
Reverse Characteristics 2.5V
100
100
Reverse Characteristics 7V
T
A
= –55°C TO 125°C
V
REF
= 7V
80
60
1
40
0.1
20
1.6
0.01
2.490
2.495
2.500
2.505
2.510
0
0
1
2
REVERSE VOLTAGE (V)
LT1034 • TPC02
3 4 5 6 7 8
REVERSE VOLTAGE (V)
9
10
LT1034 • TPC09
Response Time
8
6
82k
4
2
0
V
IN
V
OUT
7V
1.0
Response Time
OUTPUT
1.5
OUTPUT
36k
V
IN
0.5
0
V
OUT
1.2V
15
0
100
INPUT
5
0
INPUT
0
40
20
TIME (µs)
60
80
0
200
100
TIME (µs)
300
400
LT1180A • TPC11
LT1180A • TPC12
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