LINER LT5400ACMS8E-3 Quad matched resistor network long-term stability: <2ppm at 2000 hr Datasheet

LT5400
Quad Matched
Resistor Network
FEATURES
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DESCRIPTION
Excellent Matching
– A-Grade: 0.01% Matching
– B-Grade: 0.025% Matching
0.2ppm/°C Matching Temperature Drift
±75V Operating Voltage (±80V Abs Max)
8ppm/°C Absolute Resistor Value Temperature Drift
Long-Term Stability: <2ppm at 2000 Hrs
–55°C to 150°C Operating Temperature
8-Lead MSOP Package
APPLICATIONS
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The LT®5400 is a quad resistor network with excellent
matching specifications over the entire temperature
range.
All four resistors can be accessed and biased independently,
making the LT5400 a convenient and versatile choice for
any application that can benefit from matched resistors.
These resistor networks provide precise ratiometric stability
required in highly accurate difference amplifiers, voltage
references and bridge circuits.
The LT5400 is available in a space-saving 8-pin MSOP
package, and is specified over the temperature range of
–55°C to 150°C.
Difference Amplifier
Reference Divider
Precision Summing /Subtracting
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Difference Amplifier
Distribution of Matching Drift
30
1
–
2
+
3
REF
4
INPUTS
R1
8
R2
7
R3
6
R4
5
5400 TA01a
–
+
25
RELATIVE OCCURRENCE
LT5400
20
15
10
5
0
–1 –0.8–0.6–0.4–0.2 0 0.2 0.4 0.6 0.8 1
ppm/°C
5400 G01
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1
LT5400
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
Total Voltage (Across Any 2 Pins) (Note 2).……….±80V
Power Dissipation (Each Resistor) (Note 3)........ 800mW
Operating Temperature Range (Note 4)
LT5400C............................................... –40°C to 85°C
LT5400I................................................ –40°C to 85°C
LT5400H............................................. –40°C to 125°C
LT5400MP.......................................... –55°C to 150°C
Specified Temperature Range (Note 4)
LT5400C................................................... 0°C to 70°C
LT5400I................................................ –40°C to 85°C
LT5400H............................................. –40°C to 125°C
LT5400MP.......................................... –55°C to 150°C
Maximum Junction Temperature ........................... 150°C
Storage Temperature Range.................... –65°C to 150°C
TOP VIEW
1
2
3
4
R1
R2
R3
R4
8
7
6
5
MS8E PACKAGE
8-LEAD PLASTIC MSOP
θJA = 40°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 9) IS FLOATING
AVAILABLE OPTIONS
PART NUMBER
R2 = R3 (Ω)
R1 = R4 (Ω)
RESISTOR RATIO
LT5400-1
10k
10k
1:1
LT5400-2
100k
100k
1:1
LT5400-3
10k
100k
1:10
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LT5400
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
SPECIFIED TEMPERATURE RANGE
LT5400ACMS8E-1#PBF
LT5400ACMS8E-1#TRPBF
LTFVR
8-Lead Plastic MSOP
0°C to 70°C
LT5400BCMS8E-1#PBF
LT5400BCMS8E-1#TRPBF
LTFVR
8-Lead Plastic MSOP
0°C to 70°C
LT5400AIMS8E-1#PBF
LT5400AIMS8E-1#TRPBF
LTFVR
8-Lead Plastic MSOP
–40°C to 85°C
LT5400BIMS8E-1#PBF
LT5400BIMS8E-1#TRPBF
LTFVR
8-Lead Plastic MSOP
–40°C to 85°C
LT5400AHMS8E-1#PBF
LT5400AHMS8E-1#TRPBF
LTFVR
8-Lead Plastic MSOP
–40°C to 125°C
LT5400BHMS8E-1#PBF
LT5400BHMS8E-1#TRPBF
LTFVR
8-Lead Plastic MSOP
–40°C to 125°C
LT5400BMPMS8E-1#PBF
LT5400BMPMS8E-1#TRPBF
LTFVR
8-Lead Plastic MSOP
–55°C to 150°C
LT5400ACMS8E-2#PBF
LT5400ACMS8E-2#TRPBF
LTGBG
8-Lead Plastic MSOP
0°C to 70°C
LT5400BCMS8E-2#PBF
LT5400BCMS8E-2#TRPBF
LTGBG
8-Lead Plastic MSOP
0°C to 70°C
LT5400AIMS8E-2#PBF
LT5400AIMS8E-2#TRPBF
LTGBG
8-Lead Plastic MSOP
–40°C to 85°C
LT5400BIMS8E-2#PBF
LT5400BIMS8E-2#TRPBF
LTGBG
8-Lead Plastic MSOP
–40°C to 85°C
LT5400AHMS8E-2#PBF
LT5400AHMS8E-2#TRPBF
LTGBG
8-Lead Plastic MSOP
–40°C to 125°C
LT5400BHMS8E-2#PBF
LT5400BHMS8E-2#TRPBF
LTGBG
8-Lead Plastic MSOP
–40°C to 125°C
LT5400BMPMS8E-2#PBF
LT5400BMPMS8E-2#TRPBF
LTGBG
8-Lead Plastic MSOP
–55°C to 150°C
LT5400ACMS8E-3#PBF
LT5400ACMS8E-3#TRPBF
LTGBH
8-Lead Plastic MSOP
0°C to 70°C
LT5400BCMS8E-3#PBF
LT5400BCMS8E-3#TRPBF
LTGBH
8-Lead Plastic MSOP
0°C to 70°C
LT5400AIMS8E-3#PBF
LT5400AIMS8E-3#TRPBF
LTGBH
8-Lead Plastic MSOP
–40°C to 85°C
LT5400BIMS8E-3#PBF
LT5400BIMS8E-3#TRPBF
LTGBH
8-Lead Plastic MSOP
–40°C to 85°C
LT5400BHMS8E-3#PBF
LT5400BHMS8E-3#TRPBF
LTGBH
8-Lead Plastic MSOP
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard 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/
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3
LT5400
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full specified
temperature range, otherwise specifications are at TA = 25°C.
SYMBOL
PARAMETER
CONDITIONS
∆R/R
Resistor Matching Ratio (Any Resistor to Any
Other Resistor)
A-Grade
TA = 0°C to 70°C
TA = –40°C to 85°C
TA = –40°C to 125°C
(∆R/R)CMRR Matching for CMRR
(∆R/R)/∆T
Resistor Matching Ratio Temperature Drift
MIN
∆R/∆T
MAX
UNITS
l
l
l
±0.010
±0.010
±0.0125
±0.0125
%
%
%
%
B-Grade
l
±0.025
%
A-Grade (Note 6)
l
±0.005
%
B-Grade (Note 6)
l
(Note 5)
l
±0.2
l
<0.1
Resistor Voltage Coefficient
∆R
TYP
±0.015
±1
%
ppm/°C
ppm/V
Excess Current Noise
Mil-Std-202 Method 308
Absolute Resistor Tolerance
A-Grade
l
<–55
±7.5
dB
%
B-Grade
l
±15
%
Distributed Capacitance
Resistor to Exposed Pad
Resistor to Resistor
Absolute Resistor Value Temperature Drift
(Note 5)
Resistor Matching Ratio Long-Term Drift
35°C 2000Hours
<2
ppm
Resistor Matching Ratio Moisture Resistance
85°C 85%R.H. 168Hours
<2
ppm
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: The instantaneous difference between the highest voltage applied
to any pin and the lowest voltage applied to any other pin should not
exceed the Absolute Maximum Rating. This includes the voltage across
any resistor, the voltage across any pin with respect to the exposed pad of
the package, and the voltage across any two unrelated pins.
Note 3: In order to keep the junction temperature within the Absolute
Maximum Rating, maximum power dissipation should be derated at
elevated ambient temperatures.
Note 4: The LT5400C is guaranteed functional over the operating
temperature range of –40°C to 85°C. The LT5400C is designed,
characterized and expected to meet specified performance from –40°C to
85°C but is not tested or QA sampled at these temperatures. The LT5400I
is guaranteed to meet specified performance from –40°C to 85°C. The
LT5400H is guaranteed to meet specified performance from –40°C to
125°C and is 100% tested at these temperature extremes. The LT5400MP
is guaranteed to meet specified performance from –55°C to 150°C and is
100% tested at these temperature extremes.
5.5
1.4
l
–10
8
pF
pF
25
ppm/°C
Note 5: This parameter is not 100% tested.
Note 6: (∆R/R)CMRR (Matching for CMRR) is a metric for the contribution
of error from the LT5400 when configured in a difference amplifier (see
Difference Amplifier in Typical Applications):
R3   R1
–
•
( ∆R/R) CMRR = 21 •  R2
R1 R4   R2 
The resistor contribution to CMRR can then be calculated in the following
way:
R2 

4•

R1 
CMRR = ( ∆R/R)
•
CMRR 
R2 R3 
+

 2 +
R1 R4 
For LT5400 options with resistor ratio 1:1, the resistor contribution to
CMRR can be simplified:
CMRR ≈ (∆R/R)CMRR
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LT5400
TYPICAL PERFORMANCE CHARACTERISTICS
Distribution of Matching Drift
Change in Matching vs Time
5
CHANGE IN RESISTOR MATCHING (ppm)
30
RELATIVE OCCURRENCE
25
20
15
10
5
0
4
3
2
1
0
–1
–2
–3
–4
–5
–1 –0.8–0.6–0.4–0.2 0 0.2 0.4 0.6 0.8 1
ppm/°C
0
400
800
1200
TIME (HOURS)
1600
2000
5400 G02
5400 G01
APPLICATIONS INFORMATION
Where to Connect the Exposed Pad
The exposed pad is not DC connected to any resistor
terminal. Its main purpose is to reduce the internal temperature rise when the application calls for large amounts
of dissipated power in the resistors. The exposed pad can
be tied to any voltage (such as ground) as long as the
absolute maximum ratings are observed.
There is capacitive coupling between the resistors and the
exposed pad, as specified in the Electrical Characteristics
table. To avoid interference, do not tie the exposed pad to
noisy signals or noisy grounds.
Connecting the exposed pad to a quiet AC ground is
recommended as it acts as an AC shield and reduces the
amount of resistor-resistor capacitance.
Thermal Considerations
Each resistor is rated for relatively high power dissipation,
as listed in the Absolute Maximum Ratings section of
this data sheet. To calculate the internal temperature rise
inside the package, add together the power dissipated in
all of the resistors, and multiply by the thermal resistance
coefficient of the package (θJA or θJC as applicable).
For example, if each resistor dissipates 250mW, for a total
of 1W, the total temperature rise inside the package equals
40°C. All 4 resistors will be at the same temperature,
regardless of which resistor dissipates more power. The
junction temperature must be kept within the Absolute
Maximum Rating. At elevated ambient temperatures, this
places a limit on the maximum power dissipation.
In addition to limiting the maximum power dissipation,
the maximum voltage across any two pins must also be
kept less than the absolute maximum rating.
ESD
The LT5400 can withstand up to ±1kV of electrostatic
discharge (ESD, human body). To achieve the highest
precision matching, the LT5400 is designed without explicit
ESD internal protection diodes. ESD beyond this voltage
can damage or degrade the device including causing
pin-to-pin shorts.
To protect the LT5400 against large ESD strikes, external
protection can be added using diodes to the circuit supply
rails or bidirectional Zeners to ground (Figure 1).
V–
V+
BAV99
LT5400
EXTERNAL
CONNECTOR
LT5400
EXTERNAL
CONNECTOR
UMZ36K
5400 F01
Figure 1
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LT5400
TYPICAL APPLICATIONS
Difference Amplifier
LT5400
1
INPUTS
–
2
+
3
R1
8
R2
R3
6
R4
4
–
7
+
5
5400 TA02
THIS CIRCUIT CAN BE IMPLEMENTED USING ANY LT5400 RESISTOR OPTION
Reference Divider with Op Amp Input Bias Current Balancing
1
2
3
REF
4
LT5400-1 R1
8
R2
–
7
R3
REF/2
6
R4
+
5
5400 TA03
THIS CIRCUIT CAN BE IMPLEMENTED USING ANY LT5400
RESISTOR OPTION THAT HAS A RESISTOR RATIO OF 1:1
Reference Divide-by-4
REF
1
2
3
4
LT5400-1 R1
R2
R3
R4
8
7
6
+
REF/4
5
–
5400 TA04
THIS CIRCUIT CAN BE IMPLEMENTED USING ANY LT5400
RESISTOR OPTION THAT HAS A RESISTOR RATIO OF 1:1
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LT5400
PACKAGE DESCRIPTION
MS8E Package
8-Lead Plastic MSOP, Exposed Die Pad
(Reference LTC DWG # 05-08-1662 Rev I)
BOTTOM VIEW OF
EXPOSED PAD OPTION
1.88
(.074)
1
1.88 ± 0.102
(.074 ± .004)
0.29
REF
1.68
(.066)
0.889 ± 0.127
(.035 ± .005)
0.05 REF
5.23
(.206)
MIN
DETAIL “B”
CORNER TAIL IS PART OF
DETAIL “B” THE LEADFRAME FEATURE.
FOR REFERENCE ONLY
NO MEASUREMENT PURPOSE
1.68 ± 0.102 3.20 – 3.45
(.066 ± .004) (.126 – .136)
8
3.00 ± 0.102
(.118 ± .004)
(NOTE 3)
0.65
(.0256)
BSC
0.42 ± 0.038
(.0165 ± .0015)
TYP
8
7 6 5
0.52
(.0205)
REF
RECOMMENDED SOLDER PAD LAYOUT
0.254
(.010)
3.00 ± 0.102
(.118 ± .004)
(NOTE 4)
4.90 ± 0.152
(.193 ± .006)
DETAIL “A”
0° – 6° TYP
GAUGE PLANE
0.53 ± 0.152
(.021 ± .006)
DETAIL “A”
1
2 3
4
1.10
(.043)
MAX
0.86
(.034)
REF
0.18
(.007)
SEATING
PLANE
0.22 – 0.38
(.009 – .015)
TYP
0.65
(.0256)
NOTE:
BSC
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
6. EXPOSED PAD DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH ON E-PAD
SHALL NOT EXCEED 0.254mm (.010") PER SIDE.
0.1016 ± 0.0508
(.004 ± .002)
MSOP (MS8E) 0910 REV I
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Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
7
LT5400
TYPICAL APPLICATION
Precision Single-Ended to Differential Conversion
1
IN +
2
3
4
LT5400 R1
R2
R3
R4
8
–
–
7
6
OUTPUT
+
+
5
5400 TA05
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1991
Precision Difference Amplifier
0.04% Resistor Matching,100µA Op Amp
LT1990
High Voltage Difference Amplifier
±250V Input Range
LT1167
Instrumentation Amplifier
>90dB CMRR
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Linear Technology Corporation
LT 0411 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2011
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