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| Preliminary Technical Data FEATURES Easy to Use Programmable Gains: 1, 2, 5, 10 Digitally Latched or Pin Strapped Gain Setting Temp Range -40C to 85C EXCELLENT DC PERFORMANCE High CMRR 100dB G=10 Low Gain Drift: 10ppm/C Low Input Offset Drift: 1uV/C Low Input Offset: 100uV EXCELLENT AC PERFORMANCE Fast Settle Time: 0.5us to 0.01% High Slew Rate: 30V/s High CMRR over Frequency: 80dB to 10kHz Low Noise: 15nVHz, G=10 Low Power: 3mA (typ) Supply: 5V t0 12V Applications Data Acquisition Bio-Medical Analysis Test and Measurement High Performance System Monitoring 10MHz G=1, 2, 5, 10 Programmable Gain iCMOSTM Instrumentation Amplifier AD8250 30 20 10 Gain (dB ) 0 -10 -20 -30 100Hz 1kHz 10kHz 1MHz 100kHz Frequency 10MHz 100MHz 1GHz Figure 2. Gain vs Frequency GENERAL DESCRIPTION The AD8250 is a digitally gain programmable instrumentation amplifier with high G input impedance and low distortion making it suitable for sensor interfacing and driving high sample rate analog to digital converters. It has a bandwidth of 10MHz, low distortion, and settling time of 0.5us to 0.01%. The offset and gain drift are 1uV/C and 10ppm/C respectively. It has a high common-mode rejection of 74dB at G=1 from DC to 100kHz. The combination of precision DC performance coupled with high speed capabilities make the AD8250 an excellent candidate for data acquisition and medical applications. Furthermore, this monolithic solution simplifies design, manufacturing and boosts performance of instrumentation by maintaining tight match of internal resistors and amplifiers. OUT DGD WR A1 A0 -IN Logic +IN AD8250 +VS -VS REF The AD8250's user interface comprises of a parallel port that allows users to set the gain in one of three different ways. A two bit word sent to A1 and A2, via a bus may be latched using the CLK input. An alternative is to set the gain within 1s by using the gain port in transparent mode. The last method is to strap A1 and A2 to a high or low voltage potential, permanently setting the gain. The AD8250 is available in a 10-Lead MSOP package and specified over -40C to 85C, making it an excellent solution for applications where size and packing density are important considerations. Figure 1. Functional Block Diagram Rev. PrA 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 companies. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. www.analog.com Tel: 781.329.4700 Fax: 781.326.8703 (c) 2006 Analog Devices, Inc. All rights reserved. AD8250 Preliminary Technical Data TABLE OF CONTENTS AD8250--Specifications.................................................................. 3 Absolute Maximum Ratings............................................................ 6 Thermal Resistance ........................................................................ Pin Configurations And Functional Descriptions ....................... 7 Typical Performance Characteristics ........ Error! Bookmark not defined. Theory of Operation ........................................................................... Basic Frequency Response ............................................................. Outline Dimensions ..........................................................................8 ESD Caution...................................................................................8 REVISION HISTORY Revision prA: Initial Version Rev.prA | Page 2 of 9 Preliminary Technical Data AD8250--SPECIFICATIONS Table 1. VS = 12 V, VREF = 0 V (@TA = 25oC, G = +1, RL = 2 k, unless otherwise noted.) Parameter COMMON-MODE REJECTION RATIO (CMRR) CMRR to 60 Hz with 1 k Source Imbalance Conditions Min AD8250 AD8250ARM Typ Max Unit CMRR to 100kHz VCM = -10 V to +10 V G=1 G=2 G=5 G = 10 VCM = -10 V to +10 V G=1 G=2 G=5 G = 10 G=1 G=2 G=5 G=10 G=1 G=2 G=5 G=10 f = 1kHz G=1, VS = 5 V to 12 V T = -40C to +85C T = -40C to +85C G=2, VS = 5 V to 12 V T = -40C to +85C T = -40C to +85C G=5, VS = 5 V to 12 V T = -40C to +85C T = -40C to +85C G=10, VS = 5 V to 12 V T = -40C to +85C T = -40C to +85C VS = 2.5 V to 8 V 76 80 86 94 100 74 dB dB dB dB dB dB dB dB nV/Hz nV/Hz nV/Hz NOISE Voltage Noise, 1kHz 15 nV/Hz V p-p V p-p V p-p V p-p fA/Hz RTI, 0.1 Hz to 10 Hz Current Noise VOLTAGE OFFSET Input Offset, VOS Over Temperature Average TC Input Offset, VOS Over Temperature Average TC Input Offset, VOS Over Temperature Average TC Input Offset, VOS Over Temperature Average TC Offset Referred to the Input vs. Supply (PSR) G=1 G=2 G=5 G = 10 100 1 100 1 100 1 100 1 V V V/C V V V/C V V V/C V V V/C dB dB dB 96 dB INPUT CURRENT Input Bias Current Over Temperature T = -40C to +85C 10 15 25 nA nA Rev. prA | Page 3 of 9 AD8250 Parameter Average TC Input Offset Current Over Temperature Average TC Preliminary Technical Data Conditions Min AD8250ARM Typ Max 5 T = -40C to +85C Unit pA/C nA nA pA/C 10 1.5 DYNAMIC RESPONSE Small Signal -3dB Bandwidth , G=1 G=2 G=5 G=10 Settling Time 0.01% 10 V Step G=1 G=2 G=5 G=10 17 15 10 3.5 0.5 MHz MHz MHz MHz S S S S S S S S Settling Time 0.001% 10 V Step G=1 G=2 G=5 G=10 Slew Rate G=1 G=2 G=5 G=10 Gain 1 to Gain 10, 1V signal. 0.01% (if this is just the sum of gain time + settle, then remove) Gain 1 to Gain 10, 1V signal. 0.001% RL = 100kOhms, G=1 RL = 2kOhms (try 600Ohms?), G=1 1 VOUT= 10 V G=1 G=2 G=5 G=10 VOUT = -10 V to +10 V G=1, RL = 10 k G=2, RL = 10 k G=5, RL = 10 k G=10, RL = 10 k G=1-10, RL = 2 k All Gains 10 0.10 20 35 V/S V/S V/S V/S S S % % V/V % Gain Switching and Settle Time Total Harmonic Distortion + Noise GAIN Gain Range: 1, 2, 5, 10 Gain Error Gain Nonlinearity 10 40 ppm Ppm Ppm Ppm Ppm Gain Nonlinearity Gain vs. Temperature INPUT Input Impedance Differential Common Mode Input Operating Voltage Range 10 3 ppm/C 1|| 2 1|| 2 VS = 5 V to 15 V Rev.prA | Page 4 of 9 G|| pF G|| pF V Preliminary Technical Data Parameter Over Temperature OUTPUT Output Swing Over Temperature Short Circuit Current REFERENCE INPUT RIN IIN Voltage Range Gain to Output Digital Logic Inputs Digital Ground Voltage, DGND Digital Input Voltage Low Digital Input Voltage High Digital Input Leakage Current Gain Switching Time TSU THD TWR_LO TWR_HI POWER SUPPLY Operating Range3 Quiescent Current Over Temperature TEMPERATURE RANGE Specified Performance T = -40C to +85C AD8250 Min AD8250ARM Typ Max Unit V Conditions T = -40C to +85C RL = 10 k, VS = 5 V to 15 V T = -40C to +85C -Vs + 1.5 +Vs - 2 V V mA 20 VIN+, VIN-, VREF = 0 -Vs +Vs k A V V/V V V V V pA Ns Ns ns Ns Ns 5 3 15 mA mA -40 +85 C Rev. prA | Page 5 of 9 AD8250 ABSOLUTE MAXIMUM RATINGS Board) Preliminary Technical Data Table 2. AD8250 Absolute Maximim Ratings Parameter Supply Voltage Power Dissipation Output Short Circuit Current Common-Mode Input Voltage Differential Input Voltage Storage Temperature Operating Temperature Range Lead Temperature Range (Soldering 10 sec) Junction Temperature JA (4 layer JEDEC Standard Rating +/-14V See Figure 2 VEE - 0.5 V to VCC + 0.5 V V -65C to +125C -40C to +85C C C C/W Package Glass Transition Temperature ESD (Human Body Model) ESD (Charge Device Model) ESD (Machine Model) C kV kV kV Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other condition s 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. Rev.prA | Page 6 of 9 Preliminary Technical Data PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS -IN 1 DGND 2 -VS 3 10 +IN AD8250 Table 3. Pin Function Descriptions-- 10-Lead MSOP(ARM PACKAGE) Pin No. 1 2 3 4 5 6 7 8 9 Name -IN DGND -Vs A0 A1 WR VOUT +Vs VREF Description Inverting Input Terminal (True differential input) Digital Ground. Negative Supply Terminal Gain Setting Pin (LSB) Gain Setting Pin (MSB) Write Enable Output Terminal Positive Supply Terminal Reference Voltage Terminal (drive this pin with a low impedance voltage source to level shift the output signal) Non-inverting Input Terminal (True differential input) AD8250 9 8 VREF +VS TOP VIEW A0 4 (Not to Scale) 7 VOUT A1 5 6 WR Figure 3. 10-Lead MSOP 10 +IN Rev. prA | Page 7 of 9 AD8250 OUTLINE DIMENSIONS Preliminary Technical Data Figure 4. 10 Lead MSOP (RM) - Dimensions shown in millimeters ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. Table 4. Ordering Guide AD8250 Products AD8250ARMZ AD8250ARMZ-RL AD8250ARMZ-R7 AD8250-EVAL Temperature Package -40C to +85C -40C to +85C -40C to +85C Package Description 10-Lead MSOP 10-Lead MSOP 10-Lead MSOP Evaluation Board Package Option RM-10 RM-10 RM-10 Branding Rev.prA | Page 8 of 9 Preliminary Technical Data AD8250 NOTES (c) 2006 (c) 2003 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective companies. Printed in the U.S.A. PR06288-0-7/06(PrA) Rev. prA | Page 9 of 9 |
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