VRE305 RoHS Precision Voltage Reference COMPLIANT FEATURES +5V Output, 0.5mV (0.01%) Temperature Drift: 0.6ppm/C Low Noise: 3V (0.1-10 Hz) P-P Industry Standard Pinout: 8-pin DIP or Surface Mount Package Excellent Line Regulation: 6ppm/V Typical Output Trim Capability APPLICATIONS The VRE305 is recommended for use as a reference for 14, 16, or 18 bit D/A converters which require an external precision reference. The device is also ideal for calibrating scale factor on high resolution A/D con- verters. The VRE305 offers superior performance over monolithic references. DESCRIPTION The VRE305 is a low cost, high precision +5V reference. Packaged in an industry standard 8-pin DIP or SMT, the device is ideal for upgrading systems that use lower performance references. The device provides ultrastable +5V output with 0.5mV (0.01%) initial accuracy and a temperature coef- ficient of 0.6ppm/C. This improvement in accuracy is made possible by a unique, patented 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 VRE305 series the most accurate reference available in a standard 8-pin DIP or SMT. For enhanced performance, the VRE305 has an external trim option for users who want less than 0.01% initial error. For ultra low noise applications, an external capacitor can be attached between the noise reduc- tion pin and the ground pin. A reference ground pin is provided to eliminate socket contact resistance errors. SELECTION GUIDE Initial Error Temp. Coeff. Temp Range Package Model (mV) (ppm/C) (C) Options VRE305AD 0.5 0.6 0C to +70C DIP8 (KD) VRE305AS 0.5 0.6 0C to +70C SIP8 (GD) VRE305CD 1.0 2.0 0Cto +70C DIP8 (KD) VRE305CS 1.0 2.0 0C to +70C SIP8 (GD) Apex Microtechnology Inc. Nov 2020 www.apexanalog.com All rights reserved VRE305DS Rev LVRE305 TYPICAL CONNECTION Figure 1: Typical Connection PIN DESCRIPTIONS Pin Number Name Description 1 NC No connection. V 2 The supply voltage connection. IN 3 TEMP Provides voltage proportional to package temperature for monitoring purposes. 4 GND Ground. 5 TRIM Optional fine adjustment. Connect to a voltage divider between OUT and GND. 6 OUT 5V output. 7 REF GND Provided for accurate ground sensing. Internally connected to GND. 8 NOISE Optional noise reduction. Connect a 1F capacitor between this pin and GND. 2 VRE305DS Rev L