描述 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.特性Excellent Temperature Stability Initial Tolerance: 0.2% Typical Dynamic Impedance: 0.6 Ω Typical Wide Operating Current Range Directly Interchangeable With LM136 Needs No Adjustment for Minimum Temperature Coefficient Available in Military (–55°C/125°C) Temperature Range(1)(1) Custom temperature ranges available