MIL-STD-1553 and 1760 DATA BUS TRANSFORMERS FEATURES Meets the requirements of MIL-STD-1553B Centre-tapped primary and secondary for increased flexibility Choice of transformation ratios to accommodate the complete range of C-MAC transceivers and remote terminals, in either transformer or directcoupled configurations Leaded and surface mount versions available ZO ZO FAULT ISOLATION RESISTORS: R = 0.75 Z O (supplier by user) FC1553TI R COUPLING TRANSFORMER R R R 8 4 1 3 1 4 8 8 5 7 1: 2 1553 TERMINATED DATA BUS Cable characteristic impedance = Z O ZO = 70 ohms nominal 1 2 3 STUB length 20 ft max (Transformer-coupled only) TRANSFORMER-COUPLED NTXDATAOUT NRXDATAIN RXDATAIN 3 TXDATAOUT 2 NTXDATAOUT TXDATAOUT BUS TRANSCEIVER RXDATAIN 1 NRXDATAIN ISOLATION TRANSFORMER (Transformer-coupled only) DIRECT-COUPLED Fig. 1 Connection Diagram TRANSFORMATION RATIOS Pins (1-3) : (5-7) Pins (1-3) : (4-8) (1-2)+(2-3) : (5-6)+(6-7) : (4-6)+(6-8) 2:1 1.41 : 1 1+1 : 0.5+0.5 : 0.71+0.71 FC1553TI (12V) 1.66 : 1 1.20 : 1 1+1 : 0.6+0.6 : 0.83+0.83 FC1553TI (V) 1.41 : 1 1:1 1+1 : 0.71+0.71 : 1+1 FC1553TI (5V) 0.67 : 1 0.47 : 1 1+1 : 1.5+1.5 : 2.12+2.12 FC1553TI (5VX) 0.57 : 1 0.40 : 1 1+1 : 1.75+1.75 : 2.5+2.5 FC1760TI 0.60 : 1 0.42 : 1 1+1 : 1.67+1.67 : 2.38+2.38 C-MAC Part No. FC1553TI NOTE: For surface mount variant append part number with `-SM' www.cmac.com 2 MIL-STD 1553 and 1760 DATA BUS TRANSFORMERS f = 1MHz1 Vin = 4Vpk-pk f = 75kHz1 Vin = 8Vpk-pk 7 1 1 Vin V CMRR = 20 log10 in Vcm Vcm 5 Vin 100R 3 V2 Fig.2 Open-circuit Primary Impedence 1 3 Fig. 3 Common Mode Rejection Ratio f = 250kHz1 Vin = 27Vpk-pk 360R V1 Zp = V x 100 ohms 2 V1 Vor Vout ED 7 Ep Vout Vin overshoot = Vor ED droop = E x 100% P Ep ED 3 Vor 5 Fig. 4 Overshoot and Ringing, droop Operating Conditions Symbol f T CO T CS V WP Parameter Operating Frequency Range Operating Case Temperature Range Storage Temperature Range Peak Working Voltage Min 75 -55 -55 Typical Max 1000 +125 +150 50 Unit kHz deg C deg C V Electrical Characteristics Symbol TR CMRR ZP Parameter Test Conditions Typical Turns Ratio Tolerance Common Mode Rejection Ratio Open-Circuit Primary Impedance Fig. 2 Fig. 3 Overshoot and Ringing Fig. 4 ED I Droop Leakage Industance R DC R IW C IW DC Winding Resistance Interwinding Resistance Interwinding Capacitance Fig. 4 (1-3) with (4-8) short circuit (1-3), 10mA (2-6), 100V (2-6), 0.1V, 10kHz or Min www.cmac.com 45 3 Max Unit 3 % 50 dB k 1 Vpk-pk 10 20 % 1 5 3 uH M pF 50 70 MIL-STD 1553 and 1760 DATA BUS TRANSFORMERS OUTLINE DRAWINGS Plug-in 8 3 2.54 (0.10) typ 7 15.9 (0.626) max 2 TOP VIEW 6 5 1 Diam. 0.5 (0.97) nom 4 7.6 (0.299) max 10.0 (0.394) min 12.7 (0.5) nom 15.9 (0.626) max Surface mount 1 8 3 7 16.5 (0.65) 2 TOP VIEW 6 5 1 4 16.5 (0.65) 5.0 max (0.197) 4 5 2.54 (0.10) typ BOTTOM VIEW 2 6 7 3.0 x 1.25 TYP (0.118 x 0.049) in 8 places 3 8 APPLICATION NOTES Refer to the appropriate C-MAC transceiver data sheet for the correct selection of transformer In `transformer-coupled' configuration, the chosen transformer forms the `isolation transformer', see Fig.1 In `direct coupled' configuration, the same transformer forms the `coupling transformer', see Fig.1 Always use FC1553TI for the `coupling transformer' in the `transformer-coupled' configuration, see Fig. 1 For PCB layout the transformer connections should be short and balanced to ensure the series inductance and resistance are minimised For further information contact us at: C-MAC MicroTechnology South Denes, Great Yarmouth, Norfolk, NR30 3PX, UK Tel: +44 (0) 1493 743 100 Email: info@cmac.com SAS6102 Issue 2 April 2008