LM129

Features n Guaranteed 10ppm/°C Temperature Coefficient n Guaranteed 1Ω Maximum Dynamic Impedance n Guaranteed 20µV Maximum Wideband Noise n Wide Operating Current Range: 0.6mA to 15mA Applications n Transducers n A/D and D/A Converters n Calibration Standards n Instrumentation Reference Typical Application 20mA Positive Current Source 20V 20k 0.1% 174Ω 0.1% LM329 6.95V 2– 7 LT1001 3+ 4 20k 0.1% 6 10k 4.3k OUT 20mA 129329 TA01 REVERSE VOLTAGE CHANGE (mV) LM129/LM329 6.9V Precision Voltage Reference Description The LM®329 temperature compensated 6.9V Zener references provide excellent stability over time and temperature, very low dynamic impedance and a wide operating current range. The device achieves low dynamic impedance by incorporating a high gain shunt regulator around the Zener. The excellent noise performance of the device is achieved by using a “buried Zener” design which eliminates surface noise phenomenon associated with ordinary Zeners. To serve a wide variety of applications, the LM129 is available in several temperature coefficient grades and two package styles. A 20mA positive current source application is shown below. 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. Reverse Voltage Change 8 TA = 25°C 7 6 5 4 3 2 1 0 0 2 4 6 8 10 REVERSE CURRENT (mA) 129329 TA01b For more information www.linear.com/LM329 129329fd 1...