VRE102C

VRE100/102 VRE100 VRE100, VRE101, VRE102 Precision Voltage Reference FEATURES ♦ Very High Accuracy: ±10 V Output, ±1.0 mV ♦ Extremely Low Drift: 1.09 ppm/ºC (-55ºC to +125ºC) ♦ Low Warm-up Drift: 1.0 ppm Typical ♦ Excellent Stability: 6 ppm/1000 Hrs. Typical ♦ Excellent Line Regulation: 3 ppm/V Typical ♦ Hermetic 14-pin Ceramic DIP ♦ Military Processing Option APPLICATIONS ♦ Precision A/D and D/A Converters ♦ Transducer Excitation ♦ Accurate Comparator Threshold Reference ♦ High Resolution Servo Systems ♦ Digital Voltmeters ♦ High Precision Test and Measurement Instruments DESCRIPTION VRE100 Series Precision Voltage References provide ultrastable +10 V (VRE100) and ±10 V (VRE102) outputs with ±1.0 mV initial accuracy and temperature coefficient as low as 1.09 ppm/°C over the full military temperature range. This improvement in accuracy is made possible by a unique, proprietary multipoint laser compensation technique. Significant improvements have been made in other performance parameters as well, including initial accuracy, warm-up drift, line regulation, and long-term stability, making the VRE100 series the most accurate and stable 10 V reference available. VRE100/102 devices are available in two operating temperature ranges, -25°C to +85°C and -55°C to +125°C, and two performance grades. All devices are packaged in 14-pin hermetic ceramic packages for maximum long-term stability. “M” versions are screened for high reliability and quality. Superior stability, accuracy, and quality make these references ideal for precision applications such as A/D and D/A converters, high-accuracy test and measurement instrumentation, and transducer excitation. Figure 1. BLOCK DIAGRAMS VRE100 VRE102 www.apexanalog.com VRE100DS Copyright © Apex Microtechnology, Inc. 2012 (All Rights Reserved) MAR 2015 1 VRE100DS REVM VRE100 1. CHARACTERISTICS AND SPECIFICATIONS ELECTRICAL SPECIFICATIONS VPS =±15V, T = +25°C, RL = 10K UNLESS OTHERWISE NOTED. Grade Parameter C Min Typ CA Max Min ±13.5 ±22 Operating Temperature -25 Storage Temperature -65 Typ M Max Min * * +85 * +150 * Typ Max Units * * V * -55 +125 ºC * * * ºC ABSOLUTE MAXIMUM RATINGS Power Supply Short Circuit Protection Continuous * * VRE100 +10 * * V VRE102 ±10 * * V OUTPUT VOLTAGE OUTPUT VOLTAGE ERRORS Initial Error ±1.2 Warmup Drift TMIN - TMAX ±1.0 2 (Note1) ±1.7 1 0.8 2 0.6 mV ppm 1.2 mV Long-Term Stability 6 * * ppm/1000hrs Noise (0.1 - 10Hz) 6 * * µVpp OUTPUT CURRENT Range ±10 * * mA REGULATION Line 3 10 * * * * ppm/V Load 3 * * ppm/mA Range 20 * * mV Temperature Coefficient 4 * * µV/ºC/mV OUTPUT ADJUSTMENT POWER SUPPLY CURRENT (Note 2) VRE100 +PS 5 7 * * * * mA VRE102 +PS 7 9 * * * * mA VRE102 -PS 4 6 * * * * mA NOTES: * Same as C Models. 1. Using the box method, the specified value is the maximum deviation from the output voltage at 25°C over the specified operating temperature range. 2. The specified values are unloaded. 2 VRE100DS VRE100 SELECTION GUIDE Model VRE102C VRE102CA VRE102M Output (V) Temperature Operating Range Volt Deviation (MAX) ±10 ±10 ±10 -25°C to +85°C -25°C to +85°C -55°C to +125°C ±0.8mV ±0.6mV ±1.2mV Hermetic 14-pin Ceramic DIP Package Style HC 2. THEORY OF OPERATION The following discussion refers to the block diagrams in Figure 1. In operation, approximately 6.3 volts is applied to the noninverting input of the op amp. The voltage is amplified by the op amp to produce a 10.000 V output. The gain is determined by the networks R1 and R2: G=1 + R2/R1. The 6.3 V zener diode is used because it is the most stable diode over time and temperature. The zener operating current is derived from the regulated output voltage through R3. This feedback arrangement provides a closely regulated zener current. This current determines the slope of the references’ voltage vs. temperature function. By trimming the zener current a lower drift over temperature can be achieved. But since the voltage vs. temperature function is nonlinear this compensation technique is not well suited for wide temperature ranges. A nonlinear compensation network of thermistors and resistors is used in the VRE series voltage references. This proprietary network eliminates most of the nonlinearity in the voltage vs. temperature function. By then adjusting the slope, this series produces a very stable voltage over wide temperature ranges. This network is less than 2% of the overall network resistance so it has a negligible effect on long term stability. By using highly stable resistors in our network, we produce a voltage reference that also has very good long term stability. 3. APPLICATION INFORMATION Page 5 shows the proper connection of the VRE100 series voltage reference with the optional trim resistors. When trimming the VRE102, the positive voltage should be trimmed first since the negative voltage tracks the positive side. Pay careful attention to the circuit layout to avoid noise pickup and voltage drops in the lines. The VRE100 series voltage references have the ground terminal brought out on two pins (pin 6 and pin 7) which are connected together internally. This allows the user to achieve greater accuracy when using a socket. Voltage references have a voltage drop across their power supply ground pin due to quiescent current flowing through the contact resistance. If the contact resistance was constant with time and temperature, this voltage drop could be trimmed out. When the reference is plugged into a socket, this source of error can be as high as 20 ppm. By connecting pin 7 to the power supply ground and pin 6 to a high impedance ground point in the measurement circuit, the error due to the contact resistance can be eliminated. If the unit is soldered into place the contact resistance is sufficiently small that it doesn’t effect performance. The VRE series voltage references can be connected with or without the use of pin 6 and still provide superior performance. VRE100DS 3 VRE100 4. TYPICAL PERFORMANCE CURVES VOUT vs. TEMPERATURE VOUT vs. TEMPERATURE VOUT vs. TEMPERATURE VOUT vs. TEMPERATURE Temperature oC VRE102M Temperature oC VRE100MA 1.2 0.8 0.6 -0.6 -0.8 -1.2 Temperature oC VRE102C Temperature oC VRE102CA VRE100 QUIESCENT CURRENT VS. TEMP Temperature oC JUNCTION TEMP. RISE VS. OUTPUT CURRENT Output Current (mA) PSRR VS. FREQUENCY Frequency (Hz) VRE102 POSITIVE OUTPUT QUIESCENT CURRENT VS. TEMP Temperature oC JUNCTION TEMP. RISE VS. OUTPUT CURRENT Output Current (mA) PSRR VS. FREQUENCY Frequency (Hz) NEGATIVE OUTPUT QUIESCENT CURRENT VS. TEMP Temperature oC 4 JUNCTION TEMP. RISE VS. OUTPUT CURRENT Output Current (mA) PSRR VS. FREQUENCY Frequency (Hz) VRE100DS VRE100 EXTERNAL CONNECTIONS 1. Optional Fine Adjust for approximately ±20mV. PIN CONFIGURATION TOP VIEW FINE ADJ. +10V NC NC NC NC TOP VIEW VRE100 NC REF. GND GND FINE ADJ. +PS -ADJ. +ADJ. -10V +10V -ADJ. -PS VRE102 +ADJ. +PS NC NC NC NC REF. GND NC NC GND NC NEED TECHNICAL HELP? CONTACT APEX SUPPORT! For all Apex Microtechnology product questions and inquiries, call toll free 800-546-2739 in North America. For inquiries via email, please contact apex.support@apexanalog.com. International customers can also request support by contacting their local Apex Microtechnology Sales Representative. To find the one nearest to you, go to www.apexanalog.com IMPORTANT NOTICE Apex Microtechnology, Inc. has made every effort to insure the accuracy of the content contained in this document. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (expressed or implied). Apex Microtechnology reserves the right to make changes without further notice to any specifications or products mentioned herein to improve reliability. This document is the property of Apex Microtechnology and by furnishing this information, Apex Microtechnology grants no license, expressed or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights. Apex Microtechnology owns the copyrights associated with the information contained herein and gives consent for copies to be made of the information only for use within your organization with respect to Apex Microtechnology integrated circuits or other products of Apex Microtechnology. This consent does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale. APEX MICROTECHNOLOGY PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN PRODUCTS USED FOR LIFE SUPPORT, AUTOMOTIVE SAFETY, SECURITY DEVICES, OR OTHER CRITICAL APPLICATIONS. PRODUCTS IN SUCH APPLICATIONS ARE UNDERSTOOD TO BE FULLY AT THE CUSTOMER OR THE CUSTOMER’S RISK. Apex Microtechnology, Apex and Apex Precision Power are trademarks of Apex Microtechnolgy, Inc. All other corporate names noted herein may be trademarks of their respective holders. www.apexanalog.com VRE100DS Copyright © Apex Microtechnology, Inc. 2012 (All Rights Reserved) MAR 20155 VRE100DS REVM