ANALOG DEVICES Inductosyn Preamplifier and Power Oscillator IPA1751, 0SC1754 FEATURES IPA1751 Encapsulated for Protection Phase Shift <5 Phase Match >1 Load Capacity 10,000pF OSC1754 tsolated 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 [PA1751 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 IPAI751 provides the necessary gain and output impedance for this purpoce. 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 10,000pF 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. 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 13 and amplitude are not exacting owing to the method of conversion used in the IRDC that is tolerant to all these parameters (see IRDC1730/31/33 Data Sheets). MODELS AVAILABLE Model IPA1751/560 is a two channel preamplifier 1kKHz to 10kKHz operating 0 to + 70C. Model OSC1754/500 is a power oscillator at 10kHz operating 0 to + 70C. SYNCHRO & RESOLVER CONVERTERS VOL. Il, 13-17SPEC I Fl CATIONS (typical @ + 25C over full range of power supply inputs unless otherwise noted) Model IPA175 1/560 GAIN 1300 + 10% GAIN MISMATCH Channel to Channel Over Temperature Range +0.15% (equivalent to2.5 arc mins) PHASE SHIFT <5 PHASE MISMATCH Channel to Channel <I CROSSTALK <0.1% OPERATING FREQUENCY 10kHz INPUT RESISTANCE 5kQ + 10% OUTPUT RESISTANCE <5, MAX LOAD CAPACITY 10,000pF MAXIMUM SIGNAL OUTPUT LEVEL 3V rms POWER SUPPLIES Voltage +12Vto + 15V Current 30mA max TEMPERATURE RANGE Operating Oto + 70C Storage 55C x0 +: 125C SIZE 2.0" x 2.0" x 0.4" (50.8mrn X 50.8mm x 10.2mm) NOTE Specifications subject to change without notice. OUTLINE DIMENSIONS Dimensions shown in inches aid (mm). 1 ye 0.4 +0.02 (10.2) 0.020 +0.001 > i Er (05 +0.913) DA f 1.175 +0.025 (4.4) 0.10 (2.5) BRASS GOLD PLATED 2.00 + 0,02 (50.8) 4.80 (45.7} ~ 021 | 7 } cos ve o+ . -vo] wo 2.00 + 0.02 (50.8) 12 +vO0 (30.4) 5x 0.2 cos 30 | x 22, 1PAI751 SIGGNDO sine O |] 0.215) | > SINUP lo+ 0.175 (4.4) 0.2 (5) OPTION TT TOP VIEW VOL. Il, 13-18 SYNCHRO & RESOLVER CONVERTERS HYBRID INDUCTOSYN PREAMPLIFIER AND POWER OSCILLATOR The IPA1764 and OSC1758 are extended temperature devices ( 55C to + 125C) with performance similar to the IPA1751 and OSC1754 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 (19.7mm) x 0.975" (24.8mm) x 0.2 (5.1mm). OTHER PRODUCTS We manufacture a range of Inductosyn/resolver-to-digital con- verters specifically designed for the numerical controlled machine tool and robot applications. IRDC1730 -- 12-bit parallel binary output with analog velocity output, direction and ripple carry logic outputs. Tracking rate up to 170 revolutions per second. IRDC1731 - A serial output converter with 4,000 counts per revolution, direction and ripple carry output. Tracking rate up to 100 revolutions/pitches per second. IRDC1732 -- A low cost hybrid. Twelve-bit parallel tri-state latched binary output. IRDC1733 -- With the features of the IRDC1730 without analog velocity and at a reduced cost. In addition to this above range, we manufacture a complete range of modular and hybrid synchro/resolver-to-digital and digital-to-synchro/resolver converters. ABSOLUTE MAXIMUM VALUES Sin& CosP 2... ee V AV Pin 2. +17V VPin 20. ee -17V Sin & Cos O/P Ik Load... 2. ee +10V Indefinite Short Circuit ProofSPECIFICATIONS (typical @ + 25C with + 15V supplies unless otherwise noted) Model 0SC1754/500 Comments and Conditions FREQUENCY 10kHiz +5% Over Temperature Range OUTPUTS. 20V rms With +V = +15V ISOLATED 15Vrms 5 Watts All Output Meet + 5% POWER O/P 10V rms Maximum Tolerance Over Temperature 5V rms Range Fully Loaded. REFERENCE | 2.5V rms @ 4mA max in Additional 7% max Change No Phase with Power Outputs Load to Full Load. REFERENCE 2 2.5V rms @ 4mA max 90 N.B. All Outputs Vary Proportional to Phase Advanced WRT Power Outputs +V Supply POWER SUPPLY +12Vto + 15V 100mA max No Load 500mA max Full Load -V -12w -15 20mA max Independent of Load TEMPERATURE RANGE Operating Oto + 70C Storage 55C to + 125C SIZE 3.125 x 2.625" x 1 (79.4mm Xx 66.7mm X 25.4mm) WEIGHT 80z 224g NOTE Specifications subject to change without notice. OUTLINE DIMENSIONS Dimensions shown in inches and (mm). I 1.00 (25.4) 4 + l Tozen MIN -- 2.625 (66.7) 0.040 +0.001 | F {1.02} DIA BRASS GOLD PLATED 02 6 - 2.20 (55.4) Onc 200 - qi 150 ouTpur 190 Bar 50 , aoe) como qi 3.125 0.020 (79.4) 1.80 OREFt (45.8) REF 2 5x02] OREFCOM 6x51 oy OSC1754 t ocno | O-Vv Nc oO - 0.263 {6.7) 0.283 (6.7) { i TOP VIEW | ABSOLUTE MAXIMUM VALUES SYNCHRO & RESOLVER CONVERTERS VOL. Il, 13-19APPLICATION OF OSC1754 AND IPAI751 The diagram below shows a hookup with the preamplifier power oscillator and an IRDC1733 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 manufacturers recommended current. By variation of the voltage outputs and current resistance, track by this up to ajproximately 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 2.22kQ. 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. TYPICALLY 250mA WA SECTIONS OF INDUCTOSYN TRACK IN SERIES _ < 00460 22286 2 r are" 8 INDUCTOSYN SLIDER OSC1754 5 DIRO4 - N OO _ webs 2s [Vv SIG COM B.C. Of xeoeoe+ @ 1 0900000 tt - COS 120 6 0 C89 8 2 SIN 110 cosi/P 2 SIN I/P IRDC1733. 100 IPA1751 BUSY 90 a Q a 66S INAIBIT 80 g 2 oo 2 > 678 & G 0 +15V 70 oo 0 p>? OGND 60 CONTROLLER -15V 50 O+5V 40 30 ORio 20 ORHi (MSB) 10 Use of 1RDC1733 with Inductosyn Preamplifier IPA1751 and Power Oscillator OSC1754 ORDERING INFORMATION IPA1751/560 Preamplifier 0 to + 70C OSC1754/500 Oscillator 10kHz, 0 to + 70C VOL. Il, 13-20 SYNCHRO & RESOLVER CONVERTERS