AD698SQ Analog Devices Inc, AD698SQ Datasheet
AD698SQ
Specifications of AD698SQ
Related parts for AD698SQ
AD698SQ Summary of contents
Page 1
... The AD698 is available in two performance grades: Grade Temperature Range AD698AP – +85 C AD698SQ – +125 C REV. B 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 which may result from its use ...
Page 2
... POWER SUPPLY REQUIREMENTS Operating Range Dual Supply Operation ( 10 V Output) Single Supply Operation +10 V Output Output Current (No Load at Signal and Excitation Outputs MIN MAX OPERATING TEMPERATURE RANGE (@ and V+, V– dc, unless otherwise noted AD698SQ Min Typ Max A V 500 A OUT B 0.4 1. 500 0.1 1 ...
Page 3
... Storage Temperature Range P Package . . . . . . . . . . . . . . . . . . . . . . . . . – +150 C Q Package . . . . . . . . . . . . . . . . . . . . . . . . – +150 C Operating Temperature Range AD698SQ . . . . . . . . . . . . . . . . . . . . . . . . – +125 C AD698AP . . . . . . . . . . . . . . . . . . . . . . . . . – +85 C Lead Temperature Range (Soldering 60 sec +300 C Power Dissipation Derates above + Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 mW Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 mW/ C THERMAL CHARACTERISTICS ...
Page 4
AD698 Typical Characteristics (at +25 C and V 240 200 160 GAIN PSRR 15–18V 120 80 40 GAIN PSRR 12–15V 20 OFFSET PSRR 12–15V 0 OFFSET PSRR 15–18V –20 –60 –40 – TEMPERATURE – C Figure ...
Page 5
THEORY OF OPERATION A block diagram of the AD698 along with an LVDT (linear variable differential transformer) connected to its input is shown in Figure 5 below. The LVDT is an electromechanical trans- ducer—its input is the mechanical displacement of ...
Page 6
AD698 CONNECTING THE AD698 The AD698 can easily be connected for dual or single supply operation as shown in Figures 7, 8 and 13. The following gen- eral design procedures demonstrate how external component values are selected and can be ...
Page 7
Multiply the primary excitation voltage by the VTR to get the expected secondary voltage at mechanical full scale. For example, for an LVDT with a sensitivity of 2.4 mV/V/mil and a full scale of 0.1 inch, the VTR = 0.0024 ...
Page 8
AD698 Note that V should be chosen so that R3 cannot have negative OS value . Figure 12 shows the desired response. V (VOLTS) OUT +10 +5 +0.1d (INCHES) –0.1 Figure 12 V–10 V Full Scale) vs. Displacement ...
Page 9
R2 = 81k – 10kHz EXC –70 0 0.033µF –60 –120 –180 0.1µF –240 R2 = 81k –300 f = 10kHz EXC –360 –420 0 100 1k FREQUENCY – Hz ...
Page 10
AD698 Determining LVDT Sensitivity LVDT sensitivity can be determined by measuring the LVDT secondary voltages as a function of primary drive and core posi- tion, and performing a simple computation. Energize the LVDT at its recommended primary drive level, V ...
Page 11
OUT Solving for 400 and setting R OUT [400 – 19. Choose an oscillator amplitude that is in the range ...
Page 12
AD698 0.005 (0.13) MIN PIN 1 0.200 (5.08) MAX 0.200 (5.08) 0.125 (3.18) 0.023 (0.58) 0.014 (0.36) 0.048 (1.21) 0.042 (1.07) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 24-Pin Cerdip (Wide) 0.098 (2.49) MAX 24 13 0.610 (15.5) 0.520 ...