LT6657 1.5ppm/C Drift, Low Noise, Buffered Reference Fea T Descrip T n Low Drift The LT 6657 is a precision voltage reference that combines n A Grade: 1.5ppm/C Max robust operating characteristics with extremely low drift n B Grade: 3ppm/C Max and low noise. With advanced curvature compensation, n Low Noise: this bandgap reference achieves 1.5ppm/C drift with n 0.5ppm (0.1Hz to 10Hz) predictable temperature behavior, and an initial voltage P-P n 0.8ppm (10Hz to 1kHz) accuracy of 0.1%. It also offers 0.5ppm noise and very RMS P-P n Wide Supply Range to 40V low temperature cycling hysteresis. n Sources and Sinks 10mA Min The LT6657 is a low dropout reference that can be powered n Line Regulation: 0.2ppm/V from as little as 50mV above the output voltage, up to 40V. n Load Regulation: 2V/mA The buffered output supports 10mA of output drive with n Reverse Supply Protection low output impedance and precise load regulation. The n Reverse Output Protection high sink current capability allows operation as a negative n Low Power Shutdown: <4A Max voltage reference with the same precision as a positive n 1.5V Min Supply for 1.25V Option reference. This part is safe under reverse battery condi- n Thermal Protection tions, and includes current protection when the output is n Can Operate in Shunt Mode short-circuited and thermal shutdown for overload condi- n Configurable as a Negative Reference tions. A shutdown is included to allow power reduction n Available Output Voltage Options: 1.25V, 2.5V, 3V, while enabling a quick turn-on. 4.096V, 5V n The LT6657 is fully specified over the temperature range of MSOP-8 Package 40C to 125C. It is available in the 8-lead MSOP package. a T 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. n High Temperature Industrial n High Resolution Data Acquisition Systems n Instrumentation and Process Control n Automotive Control and Monitoring n Medical Equipment n Shunt and Negative Voltage References Output Voltage Temperature Drift Typical a T 200 THREE TYPICAL PARTS Basic Connection 100 1ppm/C BOX 2 0 (V + 50mV) < V < 40V OUT IN IN 6 V LT6657 OUT OUT 3 C SHDN C IN OUT 0.1F 1F 100 GND 6657 TA01a 4 200 45 20 5 30 55 80 105 130 TEMPERATURE (C) 6657 TA01b 6657fd 1 For more information www.linear.com/LT6657 OUTPUT VOLTAGE CHANGE (NORMALIZED) (PPM) ion pplica ions pplica ion uresLT6657 a Te Maxi Mu M r a T p in c F T (Note 1) Input Voltage V (to GND) .......................... 40V to 40V IN TOP VIEW Shutdown Voltage SHDN ............................ 20V to 40V DNC 1 8 DNC V 2 7 DNC IN Output Voltage V ..................................... 3V to 30V OUT SHDN 3 6 V OUT GND 4 5 DNC Input-to-Output Differential Voltage (Note 2) ..........40V MS8 PACKAGE Output Short-Circuit Duration .......................... Indefinite 8-LEAD PLASTIC MSOP Operating Junction Temperature T = 150C, = 273C/W JMAX JA DNC: CONNECTED INTERNALLY Range ................................................ 40C to 150C DO NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS Storage Temperature Range .................. 65C to 150C Lead Temperature (Soldering 10 sec) (Note 3) ............................................................300C