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Dual RejustorTM Micro-Resistor
The Rejustor is a precision, electrically-adjustable resistor from Microbridge. The Rejustor can be adjusted to a precision of 0.1%, or better. The Rejustor can be re-adjusted many times bidirectionally within the active range using standard hardware and LabVIEW-based Rejust-it calibration software. Low-power Rejustors are suitable for applications where the total power dissipation (in the pair) does not exceed 1mW. As a passive device, there is no warm-up period or boot-up time. Each Rejustor is independently adjustable to any value in the 30% adjustment range while still offering excellent TCR. They are nonvolatile, maintaining their adjusted value indefinitely. Each Low-TCR Rejustor maintains 0ppm/K TCR across the adjustment range within 100ppm/K. Relative TCR between both Rejustors is less than 50ppm/K. PARAMETER Resistance (as-manufactured) Minimum adjustable resistance Adjustment Precision TCR (per Rejustor) Power dissipation (per Rejustor) BENEFITS SPECIFICATION 4.7K 3.3K 1 0.1% or 0.01% 0100ppm/K 0.5mW ELECTRICALLY ADJUSTABLE 4.7K 1:1 RESISTOR PAIR
R1 R2
Low TCR, 1mW
MBD-472-AL
R1ADJ
e
e
R2ADJ
HGND
Figure 1: Functional Block Diagram FEATURES Electrically adjustable 4.7K 1:1 dual resistor Passive, non-volatile variable resistor Adjustment range: 30% down from asmanufactured resistance Bi-directional adjustment within active range Long term stability 0.5%, see Table 5 Flexibility: Potential for multiple adjustments Stable Temperature Coefficient as resistance is adjusted - TCR: 0100ppm/K Power Rating up to 1.0mW at 70oC Suitable for operation from -40 to +125oC, refer to Table 2 Passive device, requires no power to operate or maintain adjustment Easy to adjust with Rejust-it software and external DAC/ADC hardware Typical adjust times: ~ 1sec1. APPLICATIONS Anywhere precision adjustment is required Gain and offset adjustment Reference voltage or current adjustment Precision Voltage Regulator adjustment Filter tuning RF Amplifier biasing Opto-electronics Frequency Control devices Mechanical or digital potentiometer replacement Suitable for high-frequency applications
R1
R2
Precision electrical in-circuit adjustment Externally adjust or calibrate parameters on circuits or sensors at final assembly Adjustment process isolated from circuit allows true in-circuit calibration Single chip solution to calibrate voltages, currents, offsets, gains, etc. No mechanical moving parts - suitable for vibration sensitive applications Improved reliability; dependability; dust and moisture resistance over mechanical parts Dynamic adjustment provides cost and labor savings Flexibility reduces rework cost
1
Adjustment precision is limited by temperature control, accuracy of measurement and adjustment equipment and may increase adjustment time
Information furnished by Microbridge Technologies is believed to be accurate and reliable. However, no responsibility is assumed by Microbridge Technologies for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Microbridge Technologies. Trademarks and registered trademarks are the property of their respective companies.
Rev. 1.2
(c) 2007 Microbridge Technologies, Inc. 1980 Sherbrooke St. West, Montreal, Quebec, H3H 1E8 Tel: 514-938-8089 Fax: 514-938-9089 July 19, 2007
MBD-472-AL PIN CONFIGURATION
NC NC R1 R1 R2 R2 NC NC NC NC NC NC NC NC NC NC R1ADJ R2ADJ HGND NC
www.microbridgetech.com PIN FUNCTIONAL DESCRIPTION
Table 1: Pin Function Descriptions
Mnemonic R1 R1 R2 R2 HGND R2ADJ R1ADJ NC Description Rejustor 1 Terminal Rejustor 1 Terminal Rejustor 2 Terminal Rejustor 2 Terminal Heater Ground Rejustor 2 Adjust Input Rejustor 1 Adjust Input No Connect 16-Pin QFN Pin No. 1 2 3 4 10 11 12 5, 6, 7, 8, 9, 13, 14, 15, 16
Figure 3: Pin Configuration, 16-pin QFN package (3x3mm)
GENERAL OVERVIEW The Microbridge Technologies Low TCR dual Rejustor family of electrically adjustable micro-resistors can be adjusted and matched to resistance values for precision control of sensors, voltage regulators, amplifiers and other applications. Rejustors are passive, non-volatile devices capable of being readjusted many times to very-high precision, bi-directionally; using only integrated circuit level electrical signals. Each Rejustor is independently adjustable to any ohmic value within a continuous range from the as-manufactured resistance to at least 70% of the as-manufactured value. Rejustors are a major improvement over thin-film laser trim and fusible link technologies at the wafer and chip level; as well as manual trim pots, digital potentiometers and thick-film laser trim at the hybrid and board level. Rejustors can be adjusted in-circuit to match any desired output condition using standard test equipment. Once adjusted, Rejustors maintain their precision indefinitely. Unlike laser trimming, the Rejustor can be adjusted up or down within the active adjustment range to facilitate rework or to enhance precision, for example, Rejustors can be used to iterate towards a final value. The Rejustor does not require active power. It is electrically isolated from both substrate and heater and can therefore float, electrically. Operation of the Rejustor die has been confirmed well beyond 100MHz. High-frequency performance of a packaged Rejustor is limited by the capacitance and inductance of the package. Rejustors can be adjusted using the low-cost MBK-408 Rejustor Calibration Tool from Microbridge or National Instruments based system or other suitable electronic test equipment. The adjustment process is controlled with Rejust-it software, which is based on LabVIEW and available as executable for a standard Windows-based PC. Available in16-pin QFN packages, Rejustors are RoHS and Pb-free and green compliant.
Rev. 1.2
(c) 2007 Microbridge Technologies, Inc. 1980 Sherbrooke St. West, Montreal, Quebec, H3H 1E8 Tel: 514-938-8089 Fax: 514-938-9089 2 July 19, 2007
121S 111R ZZZZ
MBD-472-AL
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Table 2: RATINGS - Rejustor R1 and R2 (4.7K) Rejustors 0C < TA < +70C; unless otherwise noted.
Item Nominal Resistance R1 R1 Maximum Power Nominal Resistance R2 R2 Maximum Power Operating Temperature Conditions Typical Specifications 4,700 0.5mW 4,700 0.5mW As specified in this datasheet As specified in Application Note "Rejustor Operating Guidelines for -40 to +125C Operation" o Beyond -40 to +125 C Subject to power limits 0C to +70C o -40 to +125 C Contact Microbridge 25V As-manufactured resistance is 10% from nominal +0 to -30% from as-manufactured Unadjusted 2%
Isolation Voltage (between any pins) Total Resistance Tolerance Nominal Adjustment range Nominal Pair Matching
Table 3: TCR CHARACTERISTICS - Rejustors Characteristics Specification Test Method or Conditions (Worst Case)
Temperature Coefficient Unadjusted Adjusted Change in Temperature Coefficient Temperature Coefficient Matching of pairs Rejustor Self-heating Coefficient of Resistance Relative Self-heating Coefficient of Resistance Characteristics QFN Capacitive Loading QFN Mutual Capacitance 0100ppm/K 0100ppm/K 50ppm/K
TCR change in adjusted device relative to unadjusted device, by analysis Adjusted to match resistance, by analysis Per Rejustor, unadjusted When both Rejustors carry the same current
10ppm/K +4800 ppm/mW 20% 100 ppm/mW
Table 4: PACKAGE ELECTRICAL CHARACTERISTICS
Specification (Typical) 0.7pF 0.1pF Test Method or Conditions Per package pin, by analysis at 100MHz By analysis at 100MHz
Table 5: RELIABILITY DATA Characteristics
Thermal Shock/ Cycling Overload High Temperature Exposure (long-term stability) Humidity and Moisture Resistance Operational Life Test Shock Vibration, High Frequency
Limit
+ 0.5% 2 + 0.5%
2
Test Method or Conditions
JESD22-A104, -65 C to 125 C, 1000 cycles at 2 cycles/hour MIL-R-55342H Par 4.8.6 (Rated Voltage x2.5, 5sec.), Rated voltage based on 1mW maximum power
o o
V = PR
+ 0.5% 2 + 0.8% + 0.5% 0.1% 0.1%
2
2
JESD22-A103 150 C, 1000hrs o JESD22-A101, 85% RH, 85 C, 1000hrs JESD22-A108, 125 C, 1000 hrs., static operation at rated power 500G, 1ms duration, X,Y,Z axes each 5 shocks Max acceleration 20G, 20~2000~20Hz, 8 min, X,Y,Z each 4 sweeps
o
o
Where indicated, drift specifications refer to resistance drift in the positive direction. Best performance is achieved at adjustments larger than 10% down from the as-manufactured resistance.
Rev. 1.2 (c) 2007 Microbridge Technologies, Inc. 1980 Sherbrooke St. West, Montreal, Quebec, H3H 1E8 Tel: 514-938-8089 Fax: 514-938-9089 3 July 19, 2007
2
MBD-472-AL Table 6: MANUFACTURABILITY DATA Characteristics Test Method or Conditions
ESD Discharge Solder ability
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JESD22-A114, human body model weakest pin pair, all lead combinations. Class 1A o JESD22-A113, 235 C, slope 6 C/second
PACKAGING OPTIONS Table 7: NOMINAL PACKAGE DIMENSIONS
Type QFN Lead Count 16 Body Width 3.0mm Body Length 3.0mm Lead Pitch 0.5mm Lead Width 0.25mm Lead Length 0.4mm Body Thickness 0.85mm JEDEC/ EIAJ MO-220 (VEED)
0.85
0.2 ref.
QFN-16 SIDE VIEW 0.4 0.25 3.0 0.5 3.0 0.625 Nom. All dimensions in millimeters
QFN-16 BOTTOM VIEW
Figure 4: Package Dimensions
TAPE CARRIER PACKAGING
330mm
8.0mm
12mm
The tape in the reel contains 400mm Leaders and Trailers where products are not packed.
End user direction feed
Figure 5: Tape Carrier Dimensions
Rev. 1.2
(c) 2007 Microbridge Technologies, Inc. 1980 Sherbrooke St. West, Montreal, Quebec, H3H 1E8 Tel: 514-938-8089 Fax: 514-938-9089 4 July 19, 2007
MBD-472-AL Table 8: ORDERING INFORMATION
Part Number MBD-472-AL Order Code 111R Package QFN-16 Part Marking 111R-ZZZZ
3
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Delivery Tape and Reel
Quantity 4 3000
NOMINAL VALUES AVAILABLE The following additional Micro Power Dual Rejustors are available with similar performance specifications. Consult the individual datasheet for more information.
Part Number MBD-472-AL MBD-472-CL MBD-902-AL MBD-902-CL MBD-902-XL MBD-153-AL MBD-153-KL MBD-333-AL Resistance R1 Value () 4700 4700 9,000 9,000 9,000 15,000 15,000 33,000 Resistance R2 Value () 4700 24,500 9,000 45,000 63,000 15,000 45,000 33,000 Ratio 1:1 1:5 1:1 1:5 1:7 1:1 1:3 1:1 QFN Order Code 111R 1121 111T 1127 111X 111Y 111U 111Z
Please check with Microbridge Technologies Inc prior to design to ensure you have the latest revision of the datasheet for this part
3
4
Where ZZZZ represents the 4-digit date code Smaller sample quantities available on tape
Rev. 1.2 (c) 2007 Microbridge Technologies, Inc. 1980 Sherbrooke St. West, Montreal, Quebec, H3H 1E8 Tel: 514-938-8089 Fax: 514-938-9089 5 July 19, 2007

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