VRE210 VRE210 P r o VRE210 duct Innovation From Precision Voltage Reference FEATURES ♦ Very High Accuracy: +10 V Output, ±0.5 mV ♦ Extremely Low Drift: 0.6 ppm/ºC (-55ºC to +125ºC) ♦ Low Warm-up Drift: 1 ppm Typical ♦ Excellent Stability: 6 ppm/1000 Hrs. Typical ♦ Excellent Line Regulation: 3 ppm/V Typical ♦ Hermetic 20-terminal Ceramic LCC Package ♦ 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 VRE210 Series Precision Voltage References provide ultrastable +10 V outputs with ±0.5 mV initial accuracy and temperature coefficient as low as 0.6 ppm/ºC 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, warmup drift, line regulation, and long term stability, making the VRE210 series the most accurate and stable 10 V surface mount references available. VRE210 devices are available in two operating temperature ranges, -25ºC to +85ºC and -55ºC to +125ºC, and two electrical performance grades. All devices are packaged in 20-terminal ceramic LCC packages for maximum long-term stability. “M” versions are screened for high reliability and quality. Figure 1. BLOCK DIAGRAM 11 SELECTION GUIDE Output (V) Temperature Operating Range Volt Deviation (Max) VRE210C VRE210CA +10 +10 -25ºC to +85ºC -25ºC to +85ºC ±0.8mV ±0.6mV VRE210M VRE210MA +10 +10 -55ºC to +125ºC -55ºC to +125ºC ±1.2mV ±1.0mV Model VRE210DS www.cirrus.com Copyright © Cirrus Logic, Inc. 2009 (All Rights Reserved) 20-terminal Ceramic LCC Package Style HD NOV 20091 APEX − VRE210DSREVH VRE210 Product Innovation From 1. CHARACTERISTICS AND SPECIFICATIONS ELECTRICAL SPECIFICATIONS VPS =+15V, T = +25ºC, RL = 10KΩ Unless Otherwise Noted. Model VRE210C Parameter Min Typ VRE210CA Max Min +22 Typ VRE210M Max Min * * Typ VRE210MA Max Min * * Typ Max Units * * V ABSOLUTE MAXIMUM RATINGS Power Supply +13.5 Operating Temperature -25 +85 * * -55 +125 -55 +125 ºC Storage Temperature -65 +150 * * * * * * ºC Short Circuit Protection Continuous * * * +10 * * * OUTPUT VOLTAGE VRE210 V OUTPUT VOLTAGE ERRORS Initial Error ±700 Warmup Drift TMIN - TMAX ±500 2 (Note1) ±1000 1 800 ±800 2 600 1 1200 µV ppm 1000 µV 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 * * * mV/ºC/mV OUTPUT ADJUSTMENT POWER SUPPLY CURRENT (Note 2) VRE210 +PS 5 7 * * * * * * mA NOTES: * Same as C Models. 1. Using the box method, the specified value is the maximum deviation from the output voltage at 25ºC over the specified operating temperature range. 2. The specified values are unloaded. 2 VRE210DS VRE210 Product Innovation From 2. TYPICAL PERFORMANCE CURVES VOUT vs. TEMPERATURE VOUT vs. TEMPERATURE VOUT vs. TEMPERATURE VOUT vs. TEMPERATURE 1.2 0.8 1.0 0.6 -0.6 -0.8 -1.0 -1.2 Temperature oC VRE210C Temperature oC VRE210CA Temperature oC VRE210M QUIESCENT CURRENT VS. TEMP JUNCTION TEMP. RISE VS. OUTPUT CURRENT Temperature oC Output Current (mA) Temperature oC VRE210MA PSRR VS. FREQUENCY Frequency (Hz) 3. THEORY OF OPERATION The following discussion refers to the block diagram 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 V output. The gain is determined by the networks R1 and R2: G=1 + R2/R1. The 6.3V 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 that 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, Thaler Corporation 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. VRE210DS 3 VRE210 Product Innovation From 4. APPLICATION INFORMATION The proper connection of the VRE210 series voltage references with the optional trim resistor is shown below. Pay careful attention to the circuit layout to avoid noise pickup and voltage drops in the lines. The VRE210 series voltage references have the ground terminal brought out on two pins (pin 9 and pin 10) 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 10 to the power supply ground and pin 9 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 does not effect performance. PIN CONFIGURATION EXTERNAL CONNECTIONS 3 2 1 20 4 +15V 5 17 6 16 7 15 8 Ref. Gnd. 9 10 11 NC NC NC VOUT NC 19 18 12 13 18 17 16 15 14 13 NC NC 19 NC 20 VOUT = +10V 14 10KΩ NC 1 NC 2 NC 3 12 NC TOP VIEW VRE210 11 TRIM 10 GND Δ 4 9 5 NC VIN 6 7 REF GND 8 NC 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. No responsibility is assumed by Cirrus for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third parties. 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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. 4 VRE210DS