VRE410

P r o d u c t IIn n o vva t i o n FF r o m rom nno a VRE410 VRE410 DESCRIPTION Precision Dual Voltage Reference FEaTuRES ♦ ♦ ♦ ♦ ♦ ♦ ±10 V Output, ± 1.0 mV (.01%) Temperature Drift: 0.6 ppm/ºC Low Noise: 6 μVP-P (0.1-10Hz) Tracking Error: 0.5 mV Max. Excellent Line Regulation: 6 ppm/V Typical Surface Mount Package The VRE410 is a low cost, high precision, ±10 V reference. Available in a 14-pin SMT package, the device is ideal for new designs that need a high performance reference. The device provides ultrastable ±10 V output with ±1.0 mV (.01%) initial accuracy and a temperature coefficient of 0.6 ppm/°C. This improvement in accuracy is made possible by a unique, patented multipoint laser compensation technique. Another key feature of this reference is the 0.5 mV maximum tracking error between the positive and negative output voltages over the full operating temperature range. This is extremely important in high performance systems for reducing overall system errors. aPPlICaTIONS The VRE410 is recommended for use as a reference for high precision D/A and A/D converters which require an external precision reference. The device is also ideal for calibrating scale factor on high resolution A/D converters. The VRE410 offers superior performance over monolithic references. Figure 1. BlOCK DIaGRaM SElECTION GuIDE Model VRE410A VRE410B VRE410C VRE410J VRE410L Initial Error Temp. Coeff. (mV) (ppm/ºC) ±1.0 ±1.6 ±2.0 ±1.0 ±2.0 0.6 1.0 2.0 0.6 2.0 Temp. Range (ºC) 0ºC to +70ºC 0ºC to +70ºC 0ºC to +70ºC -40ºC to +85ºC -40ºC to +85ºC 14-pin Surface Mount Package Style GE VRE410DS http://www.cirrus.com Copyright © Cirrus Logic, Inc. 2009 (All Rights Reserved) MaR 2009 1 APEX − VRE410DSREVB VRE410 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 = +25ºC, RL = 10KΩ Unless Otherwise Noted. Model Parameter aBSOluTE RaTINGS Power Supply Operating Temperature (A,B,C) Operating Temperature (J,L) Storage Temperature Short Circuit Protection OuTPuT VOlTaGE VRE410 OuTPuT VOlTaGE ERRORS Initial Error Warmup Drift TMIN - TMAX Tracking Error Long-Term Stability Noise (0.1 - 10Hz) OuTPuT CuRRENT Range REGulaTION Line Load POWER SuPPlY CuRRENT (Note 4) +PS -PS 7 4 9 6 * * * * * * * * mA mA 3 3 10 * * * * * * ppm/V ppm/mA ±10 * mA (Note 2) (Note 3) 6 6 (Note 1) 1 0.6 0.5 * * ±1.00 2 1.0 0.7 * * ±1.60 3 2.0 1.0 ±2.00 mV ppm ppm/ºC mV ppm/1000hrs. µVpp ±10.0 * * V ±13.5 0 -40 -65 Continuous ±15 ±22 +70 +85 +150 * * * * * * * * * * * * * * * * * * * * V ºC ºC ºC Min a/J Typ Max Min B Typ Max Min C/l Typ Max units NOTES: * Same as A/J Models. 1. The specified values are without external trim. 2. The temperature coefficient (TC) is determined by the box method using the following formula: VMAX – VMIN T.C. = x 106 VNOMINAL x (TMAX – TMIN) 4. The tracking error is the deviation between the positive and negative output over the operating temp. range. 5. The specified values are unloaded. 2 VRE410DS P r o d u c t I n n o v a t i o nF r o m VRE410 2. TYPICal PERFORMaNCE CuRVES VOUT vs. TEMPERATURE VOUT vs. TEMPERATURE VOUT vs. TEMPERATURE Temperature oC VRE410A Temperature oC VRE410B VOUT vs. TEMPERATURE Temperature oC VRE410C VOUT vs. TEMPERATURE Temperature oC VRE410J POSITIVE OUTPUT (TYP) QUIESCENT CURRENT VS. TEMP Temperature oC VRE410L JUNCTION TEMP. RISE VS. OUTPUT CURRENT PSRR VS. FREQUENCY Temperature oC QUIESCENT CURRENT VS. TEMP Output Current (mA) NEGATIVE OUTPUT (TYP) JUNCTION TEMP. RISE VS. OUTPUT CURRENT Frequency (Hz) PSRR VS. FREQUENCY Temperature oC Output Current (mA) Frequency (Hz) VRE410DS  VRE410 . ThEORY OF OPERaTION P r o d u c t I n n o v a t i o nF r o m The following discussion refers to the block diagram in Figure 1. In operation, approximately 6.3 V 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 6.3 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, a very stable voltage is produced over wide temperature ranges. The VRE400 series voltage references have the ground terminal brought out on two pins (pin 6 and 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. PIN CONFIGuRaTION N/C 1 2 3 4 5 6 7 14 13 N/C +VOUT N/C +VIN N/C N/C N/C - VOUT N/C VRE410 TOP VIEW 12 11 10 9 8 - VI N N/C REF. GND GND 4 VRE410DS P r o d u c t I n n o v a t i o nF r o m VRE410 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 tucson.support@cirrus.com. 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. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights. 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