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Summary of Contents for HOLT ADK-15850
- Page 1 ADK-15850 Quick Start Guide – HI-15850 Transceiver Demonstration Board June 2020 QSG-15850 Rev. New Holt Integrated Circuits...
- Page 2 QSG-15850 REVISION HISTORY Revision Date Description of Change QSG-15850 Rev. New 06/12/2020 Initial Release Holt Integrated Circuits...
- Page 3 QSG-15850 Introduction The Holt HI-15850 is a MIL-STD-1553 transceiver with a unique range of hardware configuration options. The ADK-15850 Demo Board provides a convenient way to evaluate the various features. HI-15850PC Signal Break-Out Board Set Up To demonstrate the board, an external power supply providing 3.3VDC at 800mA is needed. Connect the power supply to test points 3V3 and GND along the top edge of the board.
- Page 4 Crossover should occur mid-way between ground and the 3.3V supply rail to assure acceptable “output symmetry” or “tail-off” occurring at the end of long transmit messages. This effect is discussed at length in Holt application note AN-550. Transmit Signal Sync Option To accurately synchronize TX and nTX inputs, the HI-15850 offers the option to simultaneously clock transmit input signals for each bus with a clock pulse input pin.
- Page 5 The HI-15850 Signal Break-Out Board provides 12 solder jumpers for selecting direct- or transformer- coupled operation. Direct-coupled 1553 bus interface is also known as a “short stub” connection because the terminal’s stub cable cannot exceed 12 inches (31 mm) in length. Direct-coupled bus interface requires a pair of Holt Integrated Circuits...
- Page 6 The bus couplers have a bus connection jack at each end for serial connection into the 1553 bus structure. Each end of the bus has a 78Ω terminator. Holt application note AN-550 provides additional information about the direct- and transformer-coupled configurations.
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Page 7: Board Schematic Diagram
The above comments for configuring Bus A also apply for Bus B, substituting test points BUSB and nBUSB for test points BUSA and nBUSA respectively. Board Schematic Diagram The schematic diagram for the HI-15850 Signal Break-Out Board is on the following page. Holt Integrated Circuits... - Page 8 nABUS 55 1/2W 1 : 2.65 1 : 2.07 BUSOUTA Green LED BJ77 BUSOUTA BUSINA 70 1W 70 1W 47uF .1uF ABUS BUSOUTA PM-DB2779 BUSOUTA BUSINA 55 1/2W RXENA RXENA RXWENA RXWIDENA VDDA RXENB TP15 RXENB VDDA RXWENB RXWIDENB VDDA .1uF 47uF TP14...
- Page 9 Holt Integrated Circuits, Inc. Bill of Materials PCB P/N: HV052 HI-15850 Signal Breakout Board Item Qty Description Reference Digikey P/N Mfg P/N 1 PCB, Bare, Evaluation Board NewTek 14012 3 Capacitor, 47uF 20% 16V Tant SMD 6032 C1,C4,C6 399-9739-1-ND Kemet T491C476M016AT 6 Capacitor, Cer 0.1uF 20% 50V Y5V 0805...
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