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LT5400 Quad Matched Resistor Network FEATURES
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DESCRIPTION
The LT(R)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 -55C to 150C.
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.
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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 -55C to 150C Operating Temperature 8-Lead MSOP Package
APPLICATIONS
n n n
Difference Amplifier Reference Divider Precision Summing /Subtracting
TYPICAL APPLICATION
Difference Amplifier
30 LT5400 1 INPUTS R1 R2 R3 R4 8 7 6 5
5400 TA01a
Distribution of Matching Drift
- +
2 3 4
RELATIVE OCCURRENCE
- +
25 20 15 10 5 0
REF
-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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LT5400 ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW 1 2 3 4
R1 R2 R3 R4
Total Voltage (Across Any 2 Pins) (Note 2)...........80V Power Dissipation (Each Resistor) (Note 3) ....... 800mW Operating Temperature Range (Note 4) LT5400C .............................................. -40C to 85C LT5400I ............................................... -40C to 85C LT5400H ............................................ -40C to 125C LT5400MP ......................................... -55C to 150C Specified Temperature Range (Note 4) LT5400C .................................................. 0C to 70C LT5400I ............................................... -40C to 85C LT5400H ............................................ -40C to 125C LT5400MP ......................................... -55C to 150C Maximum Junction Temperature .......................... 150C Storage Temperature Range ................... -65C to 150C
8 7 6 5
MS8E PACKAGE 8-LEAD PLASTIC MSOP JA = 40C/W, JC = 10C/W EXPOSED PAD (PIN 9) IS FLOATING
AVAILABLE OPTIONS
PART NUMBER LT5400-1 LT5400-2 LT5400-3 R2 = R3 () 10k 100k 10k R1 = R4 () 10k 100k 100k RESISTOR RATIO 1:1 1:1 1:10
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LT5400 ORDER INFORMATION
LEAD FREE FINISH LT5400ACMS8E-1#PBF LT5400BCMS8E-1#PBF LT5400AIMS8E-1#PBF LT5400BIMS8E-1#PBF LT5400AHMS8E-1#PBF LT5400BHMS8E-1#PBF LT5400BMPMS8E-1#PBF LT5400ACMS8E-2#PBF LT5400BCMS8E-2#PBF LT5400AIMS8E-2#PBF LT5400BIMS8E-2#PBF LT5400AHMS8E-2#PBF LT5400BHMS8E-2#PBF LT5400BMPMS8E-2#PBF LT5400ACMS8E-3#PBF LT5400BCMS8E-3#PBF LT5400AIMS8E-3#PBF LT5400BIMS8E-3#PBF LT5400BHMS8E-3#PBF TAPE AND REEL LT5400ACMS8E-1#TRPBF LT5400BCMS8E-1#TRPBF LT5400AIMS8E-1#TRPBF LT5400BIMS8E-1#TRPBF LT5400AHMS8E-1#TRPBF LT5400BHMS8E-1#TRPBF LT5400BMPMS8E-1#TRPBF LT5400ACMS8E-2#TRPBF LT5400BCMS8E-2#TRPBF LT5400AIMS8E-2#TRPBF LT5400BIMS8E-2#TRPBF LT5400AHMS8E-2#TRPBF LT5400BHMS8E-2#TRPBF LT5400BMPMS8E-2#TRPBF LT5400ACMS8E-3#TRPBF LT5400BCMS8E-3#TRPBF LT5400AIMS8E-3#TRPBF LT5400BIMS8E-3#TRPBF LT5400BHMS8E-3#TRPBF PART MARKING* LTFVR LTFVR LTFVR LTFVR LTFVR LTFVR LTFVR LTGBG LTGBG LTGBG LTGBG LTGBG LTGBG LTGBG LTGBH LTGBH LTGBH LTGBH LTGBH PACKAGE DESCRIPTION 8-Lead Plastic MSOP 8-Lead Plastic MSOP 8-Lead Plastic MSOP 8-Lead Plastic MSOP 8-Lead Plastic MSOP 8-Lead Plastic MSOP 8-Lead Plastic MSOP 8-Lead Plastic MSOP 8-Lead Plastic MSOP 8-Lead Plastic MSOP 8-Lead Plastic MSOP 8-Lead Plastic MSOP 8-Lead Plastic MSOP 8-Lead Plastic MSOP 8-Lead Plastic MSOP 8-Lead Plastic MSOP 8-Lead Plastic MSOP 8-Lead Plastic MSOP 8-Lead Plastic MSOP SPECIFIED TEMPERATURE RANGE 0C to 70C 0C to 70C -40C to 85C -40C to 85C -40C to 125C -40C to 125C -55C to 150C 0C to 70C 0C to 70C -40C to 85C -40C to 85C -40C to 125C -40C to 125C -55C to 150C 0C to 70C 0C to 70C -40C to 85C -40C to 85C -40C to 125C
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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LT5400 ELECTRICAL CHARACTERISTICS
SYMBOL R/R PARAMETER Resistor Matching Ratio (Any Resistor to Any Other Resistor)
The l denotes the specifications which apply over the full specified temperature range, otherwise specifications are at TA = 25C.
CONDITIONS A-Grade TA = 0C to 70C TA = -40C to 85C TA = -40C to 125C B-Grade A-Grade (Note 6) B-Grade (Note 6) (Note 5) Mil-Std-202 Method 308 A-Grade B-Grade Distributed Capacitance R/T Absolute Resistor Value Temperature Drift Resistor Matching Ratio Long-Term Drift Resistor Matching Ratio Moisture Resistance Resistor to Exposed Pad Resistor to Resistor (Note 5) 35C 2000Hours 85C 85%R.H. 168Hours
l l l l l l l l l l l
MIN
TYP
MAX 0.010 0.010 0.0125 0.0125 0.025 0.005 0.015
UNITS % % % % % % % ppm/C ppm/V dB
(R/R)CMRR Matching for CMRR (R/R)/T Resistor Matching Ratio Temperature Drift Resistor Voltage Coefficient Excess Current Noise R Absolute Resistor Tolerance
0.2 <0.1 <-55
1
7.5 15 5.5 1.4 -10 8 <2 <2 25
% % pF pF ppm/C ppm 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 -40C to 85C. The LT5400C is designed, characterized and expected to meet specified performance from -40C to 85C but is not tested or QA sampled at these temperatures. The LT5400I is guaranteed to meet specified performance from -40C to 85C. The LT5400H is guaranteed to meet specified performance from -40C to 125C and is 100% tested at these temperature extremes. The LT5400MP is guaranteed to meet specified performance from -55C to 150C and is 100% tested at these temperature extremes.
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): 1 R3 R1 ( R/R) CMRR = 2 * R2 - R4 * R2 R1 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
30 CHANGE IN RESISTOR MATCHING (ppm) 25 RELATIVE OCCURRENCE 20 15 10 5 0 5 4 3 2 1 0 -1 -2 -3 -4 -5 0 400 800 1200 TIME (HOURS) 1600 2000
5400 G02
Change in Matching vs Time
-1 -0.8-0.6-0.4-0.2 0 0.2 0.4 0.6 0.8 1 ppm/C
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 (JA or JC as applicable). For example, if each resistor dissipates 250mW, for a total of 1W, the total temperature rise inside the package equals 40C. 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- BAV99 LT5400 EXTERNAL CONNECTOR EXTERNAL CONNECTOR LT5400 UMZ36K V+
5400 F01
Figure 1
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LT5400 TYPICAL APPLICATIONS
Difference Amplifier
LT5400 1 INPUTS
R1 R2 R3 R4
8 7 6 5
5400 TA02
- +
2 3 4
- +
THIS CIRCUIT CAN BE IMPLEMENTED USING ANY LT5400 RESISTOR OPTION
Reference Divider with Op Amp Input Bias Current Balancing
1 2 REF 3 4
LT5400-1 R1 R2 R3 R4
8 7 6 5
5400 TA03
-
REF/2
+
THIS CIRCUIT CAN BE IMPLEMENTED USING ANY LT5400 RESISTOR OPTION THAT HAS A RESISTOR RATIO OF 1:1
Reference Divide-by-4
LT5400-1 R1 R2 R3 R4
REF
1 2 3 4
8 7 6 5
+
REF/4
-
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 1.88 (.074) 1.68 (.066) 0.05 REF 0.29 REF
1.88 0.102 (.074 .004)
0.889 0.127 (.035 .005)
5.23 (.206) MIN
1.68 0.102 3.20 - 3.45 (.066 .004) (.126 - .136)
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0.42 0.038 (.0165 .0015) TYP
0.65 (.0256) BSC
3.00 0.102 (.118 .004) (NOTE 3)
DETAIL "B" CORNER TAIL IS PART OF DETAIL "B" THE LEADFRAME FEATURE. FOR REFERENCE ONLY NO MEASUREMENT PURPOSE 0.52 (.0205) REF
8
7 65
RECOMMENDED SOLDER PAD LAYOUT
DETAIL "A" 0 - 6 TYP
0.254 (.010)
GAUGE PLANE
4.90 0.152 (.193 .006)
3.00 0.102 (.118 .004) (NOTE 4)
0.53 0.152 (.021 .006)
DETAIL "A"
1 1.10 (.043) MAX
23
4 0.86 (.034) REF
0.18 (.007)
SEATING PLANE
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.
0.22 - 0.38 (.009 - .015) TYP
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.
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LT5400 TYPICAL APPLICATION
Precision Single-Ended to Differential Conversion
IN +
2 3 4
R2 R3 R4
7 6 5
RELATED PARTS
PART NUMBER LT1991 LT1990 LT1167 DESCRIPTION Precision Difference Amplifier High Voltage Difference Amplifier Instrumentation Amplifier COMMENTS 0.04% Resistor Matching,100A Op Amp 250V Input Range >90dB CMRR
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507
www.linear.com
+
-
1
LT5400 R1
8
OUTPUT
- +
5400 TA05
5400f LT 0411 * PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 2011

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