. ~ - . -.. analog w devices inductosyntm preamplifier and power oscillator features ipa 1751 encapsulated for protection phase shift <5 phase match >1 load capacity 10,ooopf osc1754 isolated output multi-tapped quadrature reference output applications the ipa1751 and osc1754 when used with one of the irdc1730 series inductosyn/resolver-to-digital conver- ters offers the user all the electronic modules neces- sary for the inductosyn to controller interface. general description ipa1751 the output signals from an inductosyn slider are at a low level of the order millivolts and requires amplification and buffering before transmission to an inductosyn to digital converter. the ipa1751 provides the necessary gain and output impedance for this purpose. any gain mismatch in the two channels amplifying the sine and cosine outputs of the inductosyn slider contributes to the system error. the ipa1751 with a 0.15% gain match over the temperature range only contributes an error of 0.23 micron using a 2mm pitch inductosyn. by carefully controlling phase mismatch to less than 1 the error contribution is only 0.2 micron in a 2mm pitch inductosyn. the ipa1751 with an output resistance of less than 3 ohms and a capability of driving a cable capacity of 1o,ooopf is totally suited to machine tool application where the inductosyn to digital converter is remote from the measuring inductosyn. inductosyn is a registered trademark of farrand industries, inc. 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. no license is granted by implica- tion or otherwise under any patent or patent rights of analog devices. ---- osc1754 the osc1754 provides the drive for energization of the inductosyn track. transformer isolated outputs are available at four voltages that allows a wide range of track resistance to be accommodated. in addition to the power output, a two low power outputs are provided one in phase and one 90 in advance of the power output. the necessity for a quadrature output is for the reference input of the irdc, since inductosyn track impedance is predo- minantly resistive, the slider sine and cosine output voltages are in phase quadrature with the voltage. the demands on the absolute accuracy of the phase, frequency and amplitude are not exacting owing to the method of conversion used in the irdc that is tolerant to all these parameters (see irdci730/31/33 data sheets). models available model ipa1751/560 is a two channel preamplifier 1khz to 10khz operating 0 to + 70c. model osc1754/s00 is a power oscillator at 10khz operating 0 to + 70c. p.o. box 280; norwood, massachusetts 02062 u.s.a. tel: 617/3294700 twx: 710/394-6577 telex: 924491 cables: analog norwoodmass - ~ obsolete
. - s pee i fie at ion s (typical @ + 25oc over full range of power supply inputs unless otherwise noted) model gain gain mismatch channel to channel over temperature range phase shift phase mismatch channel to channel crosstalk operating frequency input resistance output resistance max load capacity maximum signal output level power supplies voltage current temperature range operating ipa1751/560 1300 :t 10% hybrid inductosyn preamplifier and power oscillator the ipai764 and osc1758 are extended temperature devices (- 55c to + 115c) with performance similar to the ipai751 and osci754 described in this data sheet. u.s. mil-std-883b processing is available on these products. these products are housed in a hermetically sealed 18-pin double dip metal case - 0.775" (i9.7mm) x 0.975" (24.8mm) x 0.2" (5.1mm). ,/ :t 0.15% (equivalent to 2.s arc mins) ~ /" s pee i fie a t ion s (typical @ + 25oc with j: 15v supplies unless otherwise noted) 10khz :!:5% comments and conditions over temperature range model frequency outputs osc1754/500 isolated powero/p 20v rms 15vrms lov rms 5v rms 2.5vrms@4mamaxin phase with power outputs 2.5vrms@4mamax90 phase advanced wr t power outputs + 12v to + 15v 100ma max 500ma max -12to -is 20ma max 5 watts maximum with + v = :!: 15v all output meet:!: 5% tolerance over temperature range fully loaded. additional 7% max change no load to full load. n.b. all outputs vary proportional to + v supply reference 1 reference 2 power supply no load full load -v independent of load temperature range operating storage size oto + 70c - 55c to + 125c 3.125" x 2.625" x 1" (79.4mm x 66.7mm x 25.4mm) ,---- 80z 224g weight note specifications subject to change without notice, outline dimensions dimensions shown in inches and (rom). -.l t 1.00 (25.4) 1 absolute maximum values +vpin +18v -v pin -18v ~5.1imin 0.2 r--: 15.11--1 ~ 0'~.~2~.001 dia brass gold plated 2.625 (66.7) 2.20 (55.4) ~1 -3- '-- i on/c [o t 150 4xo.2 output 10 0 (5.11 50 1.60 como (40.6) t t "" ..- (79.4) 0 ref 1 1.80 (45.8) 0 ref 2 1 5xo.2 0 ref com (5x5.11 o+v osc1754 1 ognd 0 -v n/co 0.263 (6.7) 0.263 16.71 t top view obsolete
application of osc1754 and ipa1751 the diagram below shows a "hookup" with the preamplifier power oscillator and an irdci733 with an inductosyn. precise application information is not possible as the inductosyn in its application has many variables. current set resistor this resistor is used to match the voltage output of the oscillator to the inductosyn track resistance and provide the manufacturer's recommended current. by variation of the voltage outputs and current resistance, track by this up to approximately 30 feet (9.1 meters) can be accommodated. decoupling the preamplifier and oscillator have internal high frequency decoupling capacitors on the supply lines, however, it is recom- mended that electrolytic decoupling capacitors are connected close to the module pins. current set resistor channel gains there are several ways to achieve a signal value of 2.5v rms at the converter input. when setting gains it is important that the 2.5v rms signal is the maximum in either channel. within the limits set by noise, slider exactation can be varied. a useful feature of the tracking converter is its ability to reject incoherent and common mode noise. as the input impedance of the irdc is resistive, the gain can be scaled by the addition of series resistors. the required value is 2.22kf1 per excess volt, the mismatch being more important than the absolute value. a mismatch of 0.1% in the values gives rise to an error of 0.0000787 of the inductosyn pitch. m 00 ;:;;: c:!, n cj, 00 ..... u sections of inductosyn track in series typically 250ma 000 0 > > > > 0 ..., 0 ..., n ... ... --------------- .. :!e 0 u osc1754 :!e 0 ... n u- ... ... ... uj uj uj a: a: a: 0 c > z > + c) i 000 ~ cos lip ~ sin lip c z c) ipa 1751 q. c -- z 0 c) c en >z>o~ i c)+uen 0 0 0 q. 0 z ii5 inductosyn slider sig com cos dir r.c. sin 120 110 irdc1733 100 0 busy 0 inhibit 90 80 controller 0 +15v ognd 70 60 0 -15v 0+5v 50 40 30 rlo rhi 20 (msb) 1 0 <{ r.t: use of irdc1733 with inductosyn preamplifier ipa 1751 and power oscillator osc1754 ::j z c u. t- z a: a. ordering information ip a 1751/560 preamplifier 0 to + 70c osci754/500 oscillator 10khz, 0 to + 70c -4- - ---- obsolete
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