VRE100/101/102 VRE100 P r o d u c t IInnnnoovvaa t i o n FFr roomm Precision Voltage Reference Features ♦ Very High Accuracy: ±10 V Output, ±0.5 mV ♦ Extremely Low Drift: 0.5 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), -10 V (VRE101) and ±10 V (VRE102) outputs with ±0.5 mV initial accuracy and temperature coefficient as low as 0.5 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. VRE100/101/102 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 VRE100DS http://www.cirrus.com Copyright © Cirrus Logic, Inc. 2009 (All Rights Reserved) JUN 20091 APEX − VRE100DSREVF VRE100 P r o d u c t I n n o v a t i o nF r o m 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 MA Max Min * * * -55 * * Typ Max Units * * V +125 -55 +125 ºC * * * ºC ABSOLUTE MAXIMUM RATINGS Power Supply Short Circuit Protection Continuous * * * VRE100 +10 * * * V VRE101 -10 * * * V VRE102 ±10 * * * V OUTPUT VOLTAGE OUTPUT VOLTAGE ERRORS Initial Error ±1.0 Warmup Drift TMIN - TMAX ±0.5 2 (Note1) ±1.5 1 0.6 ±0.8 2 0.3 1 1.0 mV ppm 0.5 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 * * * V/ºC/mV OUTPUT ADJUSTMENT POWER SUPPLY CURRENT (Note 2) VRE100 +PS 5 7 * * * * * * mA VRE101 -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 P r o d u c t I n n o v a t i o nF r o m Selection Guide Output (V) Temperature Operating Range Volt Deviation (MAX) VRE100C VRE100CA VRE100M VRE100MA +10 +10 +10 +10 -25°C to +85°C -25°C to +85°C -55°C to +125°C -55°C to +125°C ±0.6mV ±0.3mV ±1.0mV ±0.5mV VRE101C VRE101CA VRE101M VRE100MA -10 -10 -10 -10 -25°C to +85°C -25°C to +85°C -55°C to +125°C -55°C to +125°C ±0.6mV ±0.3mV ±1.0mV ±0.5mV VRE102C VRE102CA VRE102M VRE102MA ±10 ±10 ±10 ±10 -25°C to +85°C -25°C to +85°C -55°C to +125°C -55°C to +125°C ±0.6mV ±0.3mV ±1.0mV ±0.5mV Model 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 P r o d u c t I n n o v a t i o nF r o m 4. TYPICAL PERFORMANCE CURVES VOUT vs. TEMPERATURE VOUT vs. TEMPERATURE VOUT vs. TEMPERATURE VOUT vs. TEMPERATURE Temperature oC VRE100/101/102C Temperature oC VRE100/101/102CA Temperature oC VRE100/101/102M Temperature oC VRE100/101/102MA VRE100/101 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 P r o d u c t I n n o v a t i o nF r o m EXTERNAL CONNECTIONS 1. Optional Fine Adjust for approximately ±20mV. VRE101 center tap connects to -PS. PIN CONFIGURATION TOP VIEW TOP VIEW NC NC NC NC VRE100 NC REF. GND GND FINE ADJ. +10V NC FINE ADJ. NC +PS NC NC NC NC NC FINE ADJ. NC REF. GND GND TOP VIEW VRE101 -10V FINE ADJ. -PS -ADJ. +ADJ. -10V +10V -ADJ. -PS VRE102 +ADJ. +PS NC NC NC REF. GND NC NC GND NC NC Contacting Cirrus Logic Support For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America. For inquiries via email, please contact [email protected]. International customers can also request support by contacting their local Cirrus Logic Sales Representative. To find the one nearest to you, go to www.cirrus.com IMPORTANT NOTICE Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. 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IF THE CUSTOMER OR CUSTOMER’S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES, BY SUCH USE, TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND OTHER AGENTS FROM ANY AND ALL LIABILITY, INCLUDING ATTORNEYS’ FEES AND COSTS, THAT MAY RESULT FROM OR ARISE IN CONNECTION WITH THESE USES. Cirrus Logic, Cirrus, and the Cirrus Logic logo designs, Apex Precision Power, Apex and the Apex Precision Power logo designs are trademarks of Cirrus Logic, Inc. All other brand and product names in this document may be trademarks or service marks of their respective owners. VRE100DS 5