DATASHEET SEARCH SITE | WWW.ALLDATASHEET.COM

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 12

Technical content

Low Power, Low Cost

2.5 V Reference

Rev. H Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent ri ghts of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2005 Analog Devices, Inc. All rights reserved.

FEATURES

Low quiescent current at 250 μA max Laser trimmed to high accuracy

2.5 V ± 5 mV max (AN, AR grades)

Trimmed temperature coefficient 20 ppm/°C max (AN, AR grades) Low noise at 8 μV p-p from 0.1 Hz to 10 Hz 250 nV/√Hz wideband Temperature output pin (N, R packages) Available in three package styles 8-lead PDIP, 8-lead SOIC, and 3-pin TO-92 GENERAL DESCRIPTION The AD680 is a band gap voltage reference that provides a fixed 2.5 V output from inputs between 4.5 V and 36 V . The architecture of the AD680 enables the reference to be operated at a very low quiescent current while still realizing excellent dc characteristics and noise performance. Trimming of the high stability thin-film resistors is performed for initial accuracy and temperature coefficient, resulting in low errors over temperature. The precision dc characteristics of the AD680 make it ideal for use as a reference for DACs that require an external precision reference. The device is also ideal for ADCs and, in general, can offer better performance than the standard on-chip references. Based upon its low quiescent current, which rivals that of many incomplete 2-terminal references, the AD680 is recommended for low power applications, such as hand-held, battery-operated equipment. A temperature output pin is provided on the 8-lead package versions of the AD680. The temperature output pin provides an output voltage that varies linearly with temperature and allows the AD680 to be configured as a temperature transducer while providing a stable 2.5 V output. The AD680 is available in five grades. The AD680AN is speci- fied for operation from −40°C to +85°C, while the AD680JN is specified for 0°C to 70°C operation. Both the AD680AN and AD680JN are available in 8-lead PDIP packages. The AD680AR is specified for operation from −40°C to +85°C, while the AD680JR is specified for 0°C to 70°C operation. Both are available in 8-lead SOIC packages. The AD680JT is specified for 0°C to 70°C operation and is available in a 3-pin TO-92 package. CONNECTION DIAGRAMS *TP DENOTES FACTORY TEST POINT. NO CONNECTIONS SHOULD BE MADE TO THESE PINS. NC = NO CONNECT AD680 TOP VIEW (Not to Scale) TP* 1 +VIN 2 TEMP 3 GND 4 TP* TP* V OUT NC 00813-003 Figure 1. 8-Lead PDIP and 8-Lead SOIC Pin Configuration Figure 2. Connection Diagram TO-92 ideal for use in power-sensitive applications. a maximum variation of 6.25 mV between −40°C and +85°C. 10 Hz. Spectral density is also low, typically 250 nV/√Hz. in which 2-terminal references are usually found.

Rev. H | Page 2 of 12 TABLE OF CONTENTS

REVISION HISTORY

8/05—Rev. G to Rev. H 12/04—Rev. F to Rev. G U 5/04—Rev. E to Rev. F C 5/03—Rev. D to Rev. E C 7/01—Rev. C to Rev. D C

Rev. H | Page 3 of 12 SPECIFICATIONS TA = 25°C, VIN = 5 V , unless otherwise noted. Specifications in boldface are tested on all production units at final electrical test. Results from these tests are used to calculate outgoing quality levels. All minimum and maximum specifications are guaranteed. Table 1. AD680AN/AD680AR AD680JN/AD680JR AD680JT Parameter Min Typ Max Min Typ Max Min Typ Max Unit OUTPUT VOLTAGE Initial Accuracy, VOERR −5 +5 −10 +10 −10 +10 mV OUTPUT VOLTAGE DRIFT1 0°C to 70°C 10 10 25 10 30 ppm/°C −40°C to +85°C 20 25 25 ppm/°C LINE REGULATION

4.5 V ≤ +VIN ≤ 15 V 40 40 40 μV/V

(@ TMIN to TMAX) 40 40 40 μV/V

15 V ≤ +VIN ≤ 36 V 40 40 40 μV/V

(@ TMIN to TMAX) 40 40 40 μV/V LOAD REGULATION 0 < IOUT < 10 mA 80 100 80 100 80 100 μV/mA (@ TMIN to TMAX) 80 100 80 100 80 100 μV/mA QUIESCENT CURRENT 195 250 195 250 195 250 μA (@ TMIN to TMAX) 280 280 280 μA POWER DISSIPATION 1 1.25 1 1.25 1 1.25 mW OUTPUT NOISE

0.1 Hz to 10 Hz 8 10 8 10 8 10 μV p-p

Spectral Density, 100 Hz 250 250 250 nV/√Hz CAPACITIVE LOAD 50 50 50 nF LONG-TERM STABILITY 25 25 25 ppm/1,000 hr SHORT-CIRCUIT CURRENT TO GROUND 25 50 25 50 25 50 mA TEMPERATURE PIN Voltage Output @ 25°C 540 596 660 540 596 660 mV Temperature Sensitivity 2 2 mV/°C Output Current −5 +5 −5 +5 μA Output Resistance 12 12 kΩ TEMPERATURE RANGE Specified Performance −40 +85 0 70 0 70 °C Operating Performance2 −40 +85 −40 +85 −40 +85 °C 1 Maximum output voltage drift is guaranteed for all packages. 2 The operating temperature range is defined as the temperature extremes at which the device will still function. Parts may deviate from their specified performance outside their specified temperature range.

Rev. H | Page 4 of 12 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Rating VIN to Ground 36 V Power Dissipation (25°C) 500 mW Storage Temperature −65°C to +125°C Lead Temperature (Soldering, 10 sec) 300°C Package Thermal Resistance θJA (All Packages) 120°C/W Stresses above those listed under Absolute Maximum Ratings ma y cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. OUTPUT PROTECTION Output safe for indefinite short to GND and momentary short to −VIN. ESD CAUTION ESD (electrostatic discharge) sensitive device. Electros tatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge wi thout detection. Although this product features proprietary ESD protection circuitry, permanent dama ge may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.

4.5 V REFERENCE FROM A 5 V SUPPLY

approximately 50 MHz (see Figure 19). Figure 19. 4.5 V Reference Running from a Single 5 V Supply reference voltage in portable equipment power supplies. to the ground side of R1 should be kept as short as possible. Figure 20. Voltage Regulator for Portable Equipment

Rev. H | Page 12 of 12 ORDERING GUIDE Initial Accuracy Model Output Voltage VO (V) (mV) (%) Temperature Coefficient (ppm/°C) Package Description Package Option Parts per Reel Temperature Range (°C) AD680AR 2.5 5 0.20 20 SOIC R-8 −40 to +85 AD680AR-REEL 2.5 5 0.20 20 SOIC R-8 2,500 −40 to +85 AD680AR-REEL7 2.5 5 0.20 20 SOIC R-8 1,000 −40 to +85 AD680ARZ1 2.5 5 0.20 20 SOIC R-8 −40 to +85 AD680ARZ-REEL71 2.5 5 0.20 20 SOIC R-8 1,000 −40 to +85 AD680JR 2.5 10 0.40 25 SOIC R-8 0 to 70 AD680JR-REEL7 2.5 10 0.40 25 SOIC R-8 1,000 0 to 70 AD680JRZ1 2.5 10 0.40 25 SOIC R-8 0 to 70 AD680JRZ-REEL71 2.5 10 0.40 25 SOIC R-8 1,000 0 to 70 AD680AN 2.5 5 0.20 20 PDIP N-8 −40 to +85 AD680ANZ1 2.5 5 0.20 20 PDIP N-8 −40 to +85 AD680JN 2.5 10 0.40 25 PDIP N-8 0 to 70 AD680JNZ1 2.5 10 0.40 25 PDIP N-8 0 to 70 AD680JT 2.5 10 0.40 30 TO-92 T-3 0 to 70 AD680JTZ1 2.5 10 0.40 30 TO-92 T-3 0 to 70 1 Z = Pb-free part. ©2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the prop erty of their respective owners. C00813–0–8/05(H)