Synchro / Resolver Simulation

See D/S and D/R for newest architecture.


The unique Digital-to-Synchro/Resolver (D/S) converter modules used in NAI’s Multi-function boards are solid state designs that eliminate the need for external transformers and operate with lower AC reference frequencies – offering huge space savings. The reduced size and low power consumption of these modules make it possible to supply up to 10 channels of standard-power or 18 channels of lower-power output drive.

NAI offers three types of programmable, isolated output, Digital-to-Synchro/Resolver simulation (D/S) function modules.

The first and most commonly used form factor is a three-channel, high density module with lower-power (0.25 VA max.) output drive capability supported on all multi-function I/O platforms.

The second, a two-channel form factor with standard-power 1.5 / 2.2 VA max. for 2-28 VLL and 28-90 VLL output ranges respectively, and the third is a single-channel high-power (3 VA max.) form factor with output drive capability. (Types two and three are supported on certain platforms).

All D/S modules feature a wrap-around self-test capability and most platforms support an optional programmable AC excitation supply. Utilizing state-of-the-art technologies and design algorithms, many useful application features such as reference voltage and frequency measurement, reference loss detection, paired channel two-speed operation and many others are “built-in.” All type (D/S) converter modules used/supported on the Multi-function I/O board platforms are unique solid-state designs that operate down to 47 Hz.


Click below for detailed function module specifications:

6*D/S (Module 6*) - Three channels, 0.25 VA Power Output
DS*1D/S (Module 3*, 4*) - Single channel, 3.0 VA Power Output
DS*2D/S (Module 1*, 2*) - Two channels, 01.5/2/2 VA Outputs

Function module(s) featured in products below:

ModelBoard TypeFunction Module SlotsBoard ArchitectureSizeOn Board ReferenceEthernetOtherMaster / Slave
76C2PCI3 1/2N/A    
64C36U VME6BF533 / Cyclone® III Y2 x GB Both 
64C26U VME 6BF533 / Cyclone® II Y1 x GB Slave 
64CS46U VME5BF533 / Cyclone® II Y1 x GBHigh power D/S capableSlave 
76CS3PCI5 FullY High power D/S capable  
79C3PCIe3 1/2N/A    
75C33U cPCI2 + 1/2S/B Cyclone® II  1 x GB Slave 
75C53U cPCI2 + 1/2BF533 / Cyclone® III  1 x GB Both 
78C26U cPCI6BF533 / Cyclone® II Y1 x GBHigh power D/S capableSlave 
78CS26U cPCI5BF533 / Cyclone® II Y1 x GB Slave 
67C36U OpenVPX6BF533 / Cyclone® III Y2 x GB Both 
68C33U OpenVPX2 + 1/2BF533 / Cyclone® IV  2 x GB Both 
ModelPhotoBoard TypeDimensions w/Connectors (w x h x d)Volume w/Connectors (in3)Weight / lbs (fully populated)Est. Typ. Power Dissipation (W)# of Board SlotsFunction Module SlotsMax I/O PinsEthernet
SIU66U VME11.75" x 3.35" x 8.65"340.49<14.012 to 60 W2123162 x GB
ModelForm FactorMax ChannelsFunctionOn Board ReferenceOther
75DS23U cPCI4Synchro / Resolver / LVDT / RVDT SimulationYConvection and Conduction Cooled
73DS2PC1043Synchro / Resolver SimulationY option in lieu of one channelConvection Cooled
ModelFunctionVoltage RangeFrequency RangeExcitation / Reference SupplyNumber of ChannelsOther
65CS4 Synchro/Resolver Measurement and Stimulus1.0 to 90VL-L47 Hz to 4,000 Hz For 47Hz to 10kHz or 20kHz2 to 115Vrms4 Measurement Channels 4 Stimulus Channels5410C-89 Replacement
5388S/D & D/S2 to 115Vac47Hz to 10kHzNone2