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TDC1016 Folha de dados(PDF) 8 Page - Fairchild Semiconductor |
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TDC1016 Folha de dados(HTML) 8 Page - Fairchild Semiconductor |
8 / 12 page TDC1016 PRODUCT SPECIFICATION 8 Input Coding Table Notes: 1. For TTL, 0.0 < VIL < +0.8V is Logic 0. 2. For TTL, +2.0 < VIH < +5.0V is Logic 1. 3. For ECL, -1.85 < VIL < -1.67V is Logic 0. 4. For ECL, -1.0 < VIH < -0.8V is Logic 1. 5. x = don’t care. NDIS N2C NFH NFL Data Output Description 0 x x x xxxxxxxxxx 0.0 Output Disabled 1 1 1 1 1 1 1 1 1111111111 0000000000 0.0 -1.0 Binary (Default State for TTL Mode Control) Inputs Open 1 1 1 1 0 0 0 0 1111111111 0000000000 -1.0 0.0 Inverse Binary 1 1 0 0 1 1 1 1 0111111111 1000000000 0.0 -1.0 Two’s Complement 1 1 0 0 0 0 0 0 0111111111 1000000000 -1.0 0.0 Inverse Two’s Complement 1 1 x x 0 1 1 0 xxxxxxxxxx xxxxxxxxxx 0.0 -1.0 Force HIGH Force LOW Applications Discussion Calibration The TDC1016 is calibrated by adjusting the voltage refer- ence to give the desired full-scale output voltage. The current switches can be turned on either by loading the data register with full-scale data or by bringing the NFH input to a logic zero. Note that all 10 current switches are activated by the NFH input and the resulting full-scale output voltage will be greater than if the system used only eight or nine bits for full-scale data. Typical Application The Typical Interface Circuit (Figure 5) shows the TDC1016 in a typical application, reconstructing video signals from digital data. Television timing signals, SYNC and BLANKING, are added by injecting current from the Wilson current source into a resistor divider circuit at the output of the TDC1016. The TDC1016 output and currents from the SYNC and BLANKING inputs are summed and amplified by the HA2539 wide-band operational amplifier. Note the careful power supply decoupling at the power input pins of the amplifier. The output of the circuit is a composite video sig- nal with SYNC and BLANKING levels coming from exter- nal sources. This technique allows the TDC1016 to use its entire dynamic range for the video information while pulses are added by other means. The reference for the TDC1016 is generated by dividing the output voltage from a two-terminal band-gap voltage refer- ence. System gain is calibrated by adjusting variable resistor R1. Analog and digital grounds should be routed back to sys- tem power supply ground by separate paths. |
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