LT6657 1.5ppm/°C Drift, Low Noise, Buffered Reference FeaTuresDescripTion 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 0.5ppmP-P (0.1Hz to 10Hz) predictable temperature behavior, and an initial voltage n 0.8ppmRMS (10Hz to 1kHz) accuracy of 0.1%. It also offers 0.5ppmP-P noise and very 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: 2µV/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: <4µA 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 MSOP-8 Package The LT6657 is fully specified over the temperature range of –40°C to 125°C. It is available in the 8-lead MSOP package. applicaTions 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 Typical applicaTionOutput Voltage Temperature Drift 200 THREE TYPICAL PARTS Basic Connection 100 1ppm/°C BOX (V 2 OUT + 50mV) < VIN < 40V IN 0 6 LT6657 OUT VOUT 3 CIN SHDN COUT 0.1µF 1µF TAGE CHANGE (NORMALIZED) (PPM) –100 GND 6657 TA01a 4 OUTPUT VOL –200–45 –20 5 30 55 80 105 130 TEMPERATURE (°C) 6657 TA01b 6657fd For more information www.linear.com/LT6657 1
