The LT1009 reference circuit is a precision-trimmed 2.5-V shunt regulator featuring low dynamic impedance and a wide operating current range. The reference tolerance is achieved by on-chip trimming, which minimizes the initial voltage tolerance and the temperature coefficient, αVZ.
Although the LT1009 needs no adjustments, a third terminal (ADJ) allows the reference voltage to be adjusted ±5% to eliminate system errors. In many applications, the LT1009 can be used as a terminal-for-terminal replacement for the LM136-2.5, which eliminates the external trim network.
The LT1009 uses include 5-V system references, 8-bit analog-to-digital converter (ADC) and digital-to-analog converter (DAC) references, and power-supply monitors. The device also can be used in applications such as digital voltmeters and current-loop measurement and control systems.
The LT1009 is characterized for operation from –55°C to 125°C.
(1) Custom temperature ranges available
|Initial Accuracy (Max) (%)|
|Temp Coeff (Max) (ppm/ degree C)|
|Operating Temperature Range (C)|
|VO Adj (Max) (V)|
|VO Adj (Min) (V)|
|Min Iz for Regulation (uA)|
|Temp Coeff (Typ) (ppm/ degree C)|
|-55 to 125|