LT1634
Micropower Precision
Shunt Voltage Reference
FEATURES
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DESCRIPTION
The LT
®
1634 is a micropower, precision, shunt voltage
reference. The bandgap reference uses trimmed preci-
sion thin film resistors to achieve 0.05% initial voltage
accuracy. Improved curvature correction technique guar-
antees 10ppm/°C maximum temperature drift. Advances
in design, processing and packaging techniques guarantee
10μA operation and low temperature cycling hysteresis.
The LT1634 does not require an output compensation
capacitor, but is stable with capacitive loads. Low dynamic
impedance makes the LT1634 reference easy to use from
unregulated supplies.
The LT1634 reference can be used as a high performance
upgrade to the LM185/LM385, LT1004 and LT1034 where
lower power and guaranteed temperature drift is
required.
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Initial Voltage Accuracy: 0.05%
Low Operating Current: 10μA
Low Drift: 10ppm/°C Max
Less Than 1Ω Dynamic Impedance
Both Commercial and Industrial Temperature Range
Parts Are Available
Available in 1.25V, 2.5V, 4.096V and 5V in SO-8
and TO-92 Packages
1.25V and 2.5V Available in MSOP Package
APPLICATIONS
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Portable Meters
Precision Regulators
A/D and D/A Converters
Calibrators
TYPICAL APPLICATION
Super Accurate ±4.096V Output References
5V
45k
Temperature Drift
+
–
–5V
5V
4
5
LTC
®
1043
6
2.0
REVERSE VOLTAGE CHANGE (mV)
V
OUT
4.096V
LT1634-4.096
LT1495
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
I
R
= 10μA
V
OUT
= 1.25V
I
S
= 200μA
OUTPUT ACCURACY
BETTER THAN 0.075%
AT ±500μA OUTPUT
1μF
15
17
–5V
5V
18
–2.0
–40
–20
40
60
20
0
TEMPERATURE (°C)
80
100
1634 TA02
–
LT1495
V
OUT
–4.096V
+
1μF
–5V
1634 TA01
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LT1634
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Current Operating
1.25V ...............................................................100mA
2.5V ...................................................................50mA
4.096V, 5V .........................................................30mA
Forward Current .....................................................20mA
Operating Temperature Range
Commercial ............................................. 0°C to 70°C
Industrial .............................................–40°C to 85°C
Storage Temperature Range (Note 1) ..... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
DNC*
DNC*
DNC*
GND
1
2
3
4
8
7
6
5
DNC*
DNC*
V
OUT
TEST**
DNC* 1
DNC* 2
DNC* 3
GND 4
8 DNC*
7 DNC*
6 V
OUT
5 TEST**
Z PACKAGE
3-LEAD PLASTIC TO-92
T
JMAX
= 125°C,
θ
JA
= 190°C/W
TEST** V
OUT
GND
BOTTOM VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 250°C/W
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 125°C,
θ
JA
= 190°C/W
*Connected internally. Do Not Connect external circuitry to these pins.
**The TEST pin can be left unconnected or connected to the GND pin (GND pin on Z package, Pin4 on MS8 and S8 packages)
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LT1634BCMS8-1.25#PBF
LT1634BCMS8-1.25#TRPBF
LTCV
8-Lead Plastic MSOP
LT1634BCMS8-2.5#PBF
LT1634BCMS8-2.5#TRPBF
LTDF
8-Lead Plastic MSOP
LT1634ACS8-1.25#PBF
LT1634ACS8-1.25#TRPBF
1634A1
8-Lead Plastic SO
LT1634ACS8-2.5#PBF
LT1634ACS8-2.5#TRPBF
1634A2
8-Lead Plastic SO
LT1634ACS8-4.096#PBF
LT1634ACS8-4.096#TRPBF
1634A4
8-Lead Plastic SO
LT1634ACS8-5#PBF
LT1634ACS8-5#TRPBF
1634A5
8-Lead Plastic SO
LT1634AIS8-1.25#PBF
LT1634AIS8-1.25#TRPBF
634AI1
8-Lead Plastic SO
LT1634AIS8-2.5#PBF
LT1634AIS8-2.5#TRPBF
634AI2
8-Lead Plastic SO
LT1634AIS8-4.096#PBF
LT1634AIS8-4.096#TRPBF
634AI4
8-Lead Plastic SO
LT1634AIS8-5#PBF
LT1634AIS8-5#TRPBF
634AI5
8-Lead Plastic SO
LT1634BCS8-1.25#PBF
LT1634BCS8-1.25#TRPBF
1634B1
8-Lead Plastic SO
LT1634BCS8-2.5#PBF
LT1634BCS8-2.5#TRPBF
1634B2
8-Lead Plastic SO
LT1634BCS8-4.096#PBF
LT1634BCS8-4.096#TRPBF
1634B4
8-Lead Plastic SO
LT1634BCS8-5#PBF
LT1634BCS8-5#TRPBF
1634B5
8-Lead Plastic SO
LT1634BIS8-1.25#PBF
LT1634BIS8-1.25#TRPBF
634BI1
8-Lead Plastic SO
LT1634BIS8-2.5#PBF
LT1634BIS8-2.5#TRPBF
634BI2
8-Lead Plastic SO
LT1634BIS8-4.096#PBF
LT1634BIS8-4.096#TRPBF
634BI4
8-Lead Plastic SO
LT1634BIS8-5#PBF
LT1634BIS8-5#TRPBF
634BI5
8-Lead Plastic SO
LT1634CCZ-1.25#PBF
LT1634CCZ-1.25#TRPBF
3-Lead Plastic TO-92
LT1634CCZ-2.5#PBF
LT1634CCZ-2.5#TRPBF
3-Lead Plastic TO-92
LT1634CCZ-4.096#PBF
LT1634CCZ-4.096#TRPBF
3-Lead Plastic TO-92
LT1634CCZ-5#PBF
LT1634CCZ-5#TRPBF
3-Lead Plastic TO-92
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
SPECIFIED TEMPERATURE RANGE
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
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LT1634
AVAILABLE OPTIONS
TEMPERATURE
0°C to 70°C
ACCURACY (%)
0.05
TEMPERATURE COEFFICIENT
(ppm/°C)
10
MS8
PACKAGE TYPE
S8
LT1634ACS8-1.25
LT1634ACS8-2.5
LT1634ACS8-4.096
LT1634ACS8-5
LT1634AIS8-1.25
LT1634AIS8-2.5
LT1634AIS8-4.096
LT1634AIS8-5
LT1634BCS8-1.25
LT1634BCS8-2.5
LT1634BCS8-4.096
LT1634BCS8-5
LT1634BIS8-1.25
LT1634BIS8-2.5
LT1634BIS8-4.096
LT1634BIS8-5
Z
–40°C to 85°C
0.05
10
0°C to 70°C
0.05
25
LT1634BCMS8-1.25
LT1634BCMS8-2.5
–40°C to 85°C
0.05
25
0°C to 70°C
0.20
25
LT1634CCZ-1.25
LT1634CCZ-2.5
LT1634CCZ-4.096
LT1634CCZ-5
1.25V ELECTRICAL CHARACTERISTICS
The
l
denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 3)
PARAMETER
Reverse Breakdown Voltage
CONDITIONS
LT1634ACS8/LT1634BCMS8/LT1634BCS8/
LT1634AIS8/LT1634BIS8 (I
R
= 10μA)
LT1634CCZ (I
R
= 10μA)
LT1634ACS8 (I
R
= 10μA)
LT1634AIS8 (I
R
= 10μA)
LT1634BCS8/LT1634BCMS8 (I
R
= 10μA)
LT1634BIS8 (I
R
= 10μA)
LT1634CCZ (I
R
= 10μA)
Reverse Breakdown Change
with Current (Note 4)
10μA ≤ I
R
≤ 2mA
2mA ≤ I
R
≤ 20mA
Minimum Operating Current
Temperature Coefficient (Note 8)
Reverse Dynamic Impedance (Note 5)
Low Frequency Noise (Note 6)
Hysteresis (Note 7)
LT1634A, I
R
= 10μA
LT1634B/LT1634C, I
R
= 10μA
10μA ≤ I
R
≤ 2mA
I
R
= 10μA, 0.1Hz ≤ f ≤ 10Hz
ΔT = –40°C to 85°C
ΔT = 0°C to 70°C
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MIN
1.24937
–0.05
1.24750
–0.20
1.24849
–0.12
1.24781
–0.175
1.24718
–0.225
1.24547
–0.362
1.24531
–0.375
TYP
1.250
1.250
1.250
1.250
1.250
1.250
1.250
0.25
0.30
2
2
4
10
0.125
0.150
10
160
40
MAX
1.25062
0.05
1.25250
0.20
1.25149
0.12
1.25218
0.175
1.25281
0.225
1.25453
0.362
1.25469
0.375
1
2
8
10
7
10
25
0.5
1.0
UNITS
V
%
V
%
V
%
V
%
V
%
V
%
V
%
mV
mV
mV
mV
μA
ppm/°C
ppm/°C
Ω
Ω
μV
P-P
ppm
ppm
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LT1634
2.5V ELECTRICAL CHARACTERISTICS
PARAMETER
Reverse Breakdown Voltage
CONDITIONS
LT1634ACS8/LT1634BCMS8/LT1634BCS8/
LT1634AIS8/LT1634BIS8 (I
R
= 10μA)
LT1634CCZ (I
R
= 10μA)
LT1634ACS8 (I
R
= 10μA)
LT1634AIS8 (I
R
= 10μA)
LT1634BCMS8/LT1634BCS8 (I
R
= 10μA)
LT1634BIS8 (I
R
= 10μA)
LT1634CCZ (I
R
= 10μA)
Reverse Breakdown Change
with Current (Note 4)
10μA ≤ I
R
≤ 2mA
2mA ≤ I
R
≤ 20mA
Minimum Operating Current
Temperature Coefficient (Note 8)
Reverse Dynamic Impedance (Note 5)
Low Frequency Noise (Note 6)
Hysteresis (Note 7)
LT1634A, I
R
= 10μA
LT1634B/LT1634C, I
R
= 10μA
10μA ≤ I
R
≤ 2mA
I
R
= 10μA, 0.1Hz ≤ f ≤ 10Hz
ΔT = –40°C to 85°C
ΔT = 0°C to 70°C
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The
l
denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 3)
MIN
2.49875
–0.05
2.49500
–0.20
2.49700
–0.12
2.49562
–0.175
2.49437
–0.225
2.49094
–0.362
2.49062
–0.375
TYP
2.500
2.500
2.500
2.500
2.500
2.500
2.500
0.30
0.40
2
2
4
10
0.15
0.20
15
160
40
MAX
2.50125
0.05
2.50500
0.20
2.50300
0.12
2.50437
0.175
2.50562
0.225
2.50906
0.362
2.50937
0.375
1.5
3.0
8
10
8
10
25
0.75
1.50
UNITS
V
%
V
%
V
%
V
%
V
%
V
%
V
%
mV
mV
mV
mV
μA
ppm/°C
ppm/°C
Ω
Ω
μV
P-P
ppm
ppm
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4.096 ELECTRICAL CHARACTERISTICS
PARAMETER
Reverse Breakdown Voltage
CONDITIONS
LT1634ACS8/LT1634BCS8/
LT1634AIS8/LT1634BIS8 (I
R
= 20μA)
LT1634CCZ (I
R
= 20μA)
LT1634ACS8 (I
R
= 20μA)
LT1634AIS8 (I
R
= 20μA)
LT1634BCS8 (I
R
= 20μA)
LT1634BIS8 (I
R
= 20μA)
LT1634CCZ (I
R
= 20μA)
Reverse Breakdown Change
with Current (Note 4)
20μA ≤ I
R
≤ 2mA
2mA ≤ I
R
≤ 20mA
Minimum Operating Current
The
l
denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 3)
MIN
4.09395
–0.05
4.08780
–0.20
4.09108
–0.12
4.08883
–0.175
4.08678
–0.225
4.08115
–0.362
4.08064
–0.375
TYP
4.096
4.096
4.096
4.096
4.096
4.096
4.096
0.30
0.40
6
6
MAX
4.09805
0.05
4.10419
0.20
4.10091
0.12
4.10317
0.175
4.10522
0.225
4.11085
0.362
4.11137
0.375
1.5
3.0
15
20
15
UNITS
V
%
V
%
V
%
V
%
V
%
V
%
V
%
mV
mV
mV
mV
μA
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LT1634
4.096V ELECTRICAL CHARACTERISTICS
PARAMETER
Temperature Coefficient (Note 8)
Reverse Dynamic Impedance (Note 5)
Low Frequency Noise (Note 6)
Hysteresis (Note 7)
CONDITIONS
LT1634A, I
R
= 20μA
LT1634B/LT1634C, I
R
= 20μA
20μA ≤ I
R
≤ 2mA
I
R
= 20μA, 0.1Hz ≤ f ≤ 10Hz
ΔT = –40°C to 85°C
ΔT = 0°C to 70°C
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l
l
The
l
denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 3)
MIN
TYP
4
10
0.15
0.20
30
160
40
MAX
10
25
0.75
1.50
UNITS
ppm/°C
ppm/°C
Ω
Ω
μV
P-P
ppm
ppm
5V ELECTRICAL CHARACTERISTICS
PARAMETER
Reverse Breakdown Voltage
CONDITIONS
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 3)
MIN
4.99750
–0.05
4.99000
–0.20
4.99400
–0.12
4.99125
–0.175
4.98875
–0.225
498188
–0.362
4.98126
–0.375
TYP
5.000
5.000
5.000
5.000
5.000
5.000
5.000
0.30
0.40
6
6
4
10
0.15
0.20
35
160
40
MAX
5.00250
0.05
5.01000
0.20
5.00600
0.12
5.00875
0.175
5.01125
0.225
5.01813
0.362
5.01876
0.375
1.5
3.0
15
20
15
10
25
0.75
1.50
UNITS
V
%
V
%
V
%
V
%
V
%
V
%
V
%
mV
mV
mV
mV
μA
ppm/°C
ppm/°C
Ω
Ω
μV
P-P
ppm
ppm
LT1634ACS8/LT1634BCS8/
LT1634AIS8/LT1634BIS8 (I
R
= 20μA)
LT1634CCZ (I
R
= 20μA)
LT1634ACS8 (I
R
= 20μA)
LT1634AIS8 (I
R
= 20μA)
LT1634BCS8 (I
R
= 20μA)
LT1634BIS8 (I
R
= 20μA)
LT1634CCZ (I
R
= 20μA)
Reverse Breakdown Change
with Current (Note 4)
20μA ≤ I
R
≤ 2mA
2mA ≤ I
R
≤ 20mA
Minimum Operating Current
Temperature Coefficient (Note 8)
Reverse Dynamic Impedance (Note 5)
Low Frequency Noise (Note 6)
Hysteresis (Note 7)
LT1634A, I
R
= 20μA
LT1634B/LT1634C, I
R
= 20μA
20μA ≤ I
R
≤ 2mA
I
R
= 20μA, 0.1Hz ≤ f ≤ 10Hz
ΔT = –40°C to 85°C
ΔT = 0°C to 70°C
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Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
If the part is stored outside of the specific operating temperature
range, the output may shift due to hysteresis.
Note 3:
ESD (Electrostatic Discharge) sensitive device. Use proper ESD
handling precautions.
Note 4:
Output requires 0.1μF for operating current greater than 1mA.
Note 5:
This parameter is guaranteed by “reverse breakdown change with
current” test.
Note 6:
Peak-to-peak noise is measured with a single highpass filter at
0.1Hz and 2-pole lowpass filter at 10Hz.
Note 7:
Hysteresis in output voltage is created by package stress that
differs depending on whether the IC was previously at a higher or lower
temperature. Output voltage is always measured at 25°C but the IC is
cycled to 85°C or –40°C before successive measurements. Hysteresis is
roughly proportional to the square of the temperature change. Hysteresis
is not normally a problem for operational temperature excursions where
the instrument might be stored at high or low temperature.
Note 8:
Temperature coefficient is calculated from the minimum and
maximum output voltage measured at T
MIN
, Room and T
MAX
as follows:
TC = (V
OMAX
– V
OMIN
)/(T
MAX
– T
MIN
)
Incremental slope is also measured at 25°C.
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