Low TCR, 1mW
Dual Rejustor™ Micro-Resistor
MBD-472-AL
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 bi-
directionally within the active range using standard
hardware and LabVIEW-based Rejust-it calibration
software.
ELECTRICALLY ADJUSTABLE 4.7KΩ 1:1
RESISTOR PAIR
R2
R1
R1ADJ
R2ADJ
HGND
e
e
Low-power Rejustors are suitable for applications
where the total power dissipation (in the pair) does
not exceed 1mW.
R1
R2
Figure 1: Functional Block Diagram
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 non-
volatile, maintaining their adjusted value indefinitely.
FEATURES
° Electrically adjustable 4.7KΩ 1:1 dual resistor
° Passive, non-volatile variable resistor
° Adjustment range: 30% down from as-
manufactured resistance
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.
° 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: 0±100ppm/K
PARAMETER
SPECIFICATION
4.7KΩ
° Power Rating up to 1.0mW at 70oC
° Suitable for operation from -40 to +125oC,
refer to Table 2
Resistance (as-manufactured)
Minimum adjustable resistance
Adjustment Precision
TCR (per Rejustor)
Power dissipation (per Rejustor)
3.3KΩ
0.1% or 0.01%1
0±100ppm/K
0.5mW
° Passive device, requires no power to operate
or maintain adjustment
° Easy to adjust with Rejust-it software and
external DAC/ADC hardware
BENEFITS
° 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
° 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
° Improved reliability; dependability; dust and
moisture resistance over mechanical parts
° Dynamic adjustment provides cost and labor
savings
° Frequency Control devices
° Mechanical or digital potentiometer
replacement
°
Suitable for high-frequency applications
° 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.
© 2007 Microbridge Technologies, Inc. 1980 Sherbrooke St. West, Montreal, Quebec, H3H 1E8 Tel: 514-938-8089 Fax: 514-938-9089
Rev. 1.2
July 19, 2007
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