DATASHEET SEARCH SITE

Document overview

  • Manufacturer or author: Provided By www.digicamel.com(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 16

Technical content

Very Low Distortion, Precision Difference Amplifier AD8274 Rev. C 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 rights 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 ©2008–2011 Analog Devices, Inc. All rights reserved.

FEATURES

0.00025% THD + N (20 kHz) 0.0015% THD + N (100 kHz) Drives 600 Ω loads Excellent gain accuracy 0.03% maximum gain error 2 ppm/°C maximum gain drift Gain of ½ or 2 AC specifications

20 V/μs minimum slew rate

800 ns to 0.01% settling time High accuracy dc performance 83 dB minimum CMRR 700 μV maximum offset voltage 8-lead SOIC and MSOP packages Supply current: 2.6 mA maximum Supply range: ±2.5 V to ±18 V

APPLICATIONS

Instrumentation amplifier building blocks Level translators Automatic test equipment Sine/cosine encoders FUNCTIONAL BLOCK DIAGRAM 2 5 3 1 12kΩ 6kΩ 12kΩ –VS +VS 6kΩ 07362-001 Figure 1. Table 1. Difference Amplifiers by Category excellent gain drift, gain accuracy, and CMRR. AD8274 is well suited for measuring large industrial signals. measure voltages beyond the supplies. gains ranging from −2 to +3. makes a very good cable driver.

Rev. C | Page 2 of 16 TABLE OF CONTENTS

REVISION HISTORY

8/11—Rev. B to Rev. C 1/11—Rev. A to Rev. B 12/08—Rev. 0 to Rev. A 7/08—Revision 0: Initial Version

Rev. C | Page 3 of 16 SPECIFICATIONS VS = ±15 V , VREF = 0 V , TA = 25°C, RL = 2 kΩ, unless otherwise noted. Table 2. G = ½ G = 2 Parameter Conditions Min Typ Max Min Typ Max Unit DYNAMIC PERFORMANCE Bandwidth 20 10 MHz Slew Rate 20 20 V/μs Settling Time to 0.1% 10 V step on output, CL = 100 pF 650 750 675 775 ns Settling Time to 0.01% 10 V step on output, CL = 100 pF 725 800 750 825 ns NOISE/DISTORTION1 THD + Noise f = 1 kHz, VOUT = 10 V p-p, 600 Ω load 0.00025 0.00035 % Noise Floor, RTO2 20 kHz BW −106 −100 dBu Output Voltage Noise (Referred to Output) f = 20 Hz to 20 kHz 3.5 7 μV rms f = 1 kHz 26 52 nV/√Hz GAIN Gain Error 0.03 0.03 % Gain Drift −40°C to +85°C 0.5 2 0.5 2 ppm/°C Gain Nonlinearity VOUT = 10 V p-p, 600 Ω load 2 2 ppm INPUT CHARACTERISTICS Offset3 Referred to output 150 700 300 1100 μV vs. Temperature −40°C to +85°C 3 6 μV/°C vs. Power Supply VS = ±2.5 V to ±18 V 5 10 μV/V Common-Mode Rejection Ratio VCM = ±40 V, RS = 0 Ω, referred to input 77 86 83 92 dB Impedance5 Differential V CM = 0 V 36 9 kΩ Common Mode6 9 9 kΩ OUTPUT CHARACTERISTICS Output Swing −VS + 1.5 +VS − 1.5 −VS + 1.5 +VS − 1.5 V Short-Circuit Current Limit Sourcing 90 90 mA Sinking 60 60 mA Capacitive Load Drive 200 1200 pF POWER SUPPLY Supply Current (per Amplifier) 2.3 2.6 2.3 2.6 mA TEMPERATURE RANGE Specified Performance −40 +85 −40 +85 °C 1 Includes amplifier voltage and current noise, as well as noise of internal resistors. 2 dBu = 20 log(V rms/0.7746). 3 Includes input bias and offset current errors. 4 May also be limited by absolute maximum input voltage or by the output swing. See the Absolute Maximum Ratings section and Figure 8 through Figure 11 for details. 5 Internal resistors are trimmed to be ratio matched but to have ±20% absolute accuracy. 6 Common mode is calculated by looking into both inputs. The common-mode impedance at only one input is 18 kΩ.

Table 4. Thermal Resistance extended period may result in a loss of functionality. Figure 2. Maximum Power Dissipation vs. Ambient Temperature part to exceed its maximum junction temperature.

Figure 48. Driving Cabling

REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. Figure 49. 8-Lead Standard Small Outline Package [SOIC_N]

0.65 BSC

1.10 MAX

Figure 50. 8-Lead Mini Small Outline Package [MSOP]

Rev. C | Page 16 of 16 NOTES ©2008–2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D07362-0-8/11(C)