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DAC1231LCJ-1 Datasheet(PDF) 7 Page - Texas Instruments |
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DAC1231LCJ-1 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 20 page Application Hints 10 DIGITAL INTERFACE These DACs are designed to provide all of the necessary digital input circuitry to permit a direct interface to a wide variety of microprocessor systems The timing and logic lev- el convention of the input control signals allow the DACs to be treated as a typical memory device or IO peripheral with no external logic required in most systems Essentially these DACs can be mapped as a two-byte stack in memory (or IO space) to receive their 12 bits of input data in two successive 8-bit data writing sequences The DAC1230 se- ries is intended for use in systems with an 8-bit data bus The DAC1208 series provides all 12 digital input lines which can be externally configured to be controlled from an 8-bit bus or can be driven directly from a 16-bit data bus All of the digital inputs to these DACs contain a unique threshold regulator circuit to maintain TTL voltage level compatibility independent of the applied VCC to the DAC Any input can also be driven from higher voltage CMOS logic levels in non-microprocessor based systems To pre- vent damage to the chip from static discharge all unused digital inputs should be tied to VCC or ground As a trouble- shooting aid if any digital input is inadvertently left floating the DAC will interpret the pin as a logic ‘‘1’’ Double buffered digital inputs allow the DAC to internally format the 12-bit word used to set the current switching R- 2R ladder network (see section 20) from two 8-bit data write cycles Figures 1 and 2 show the internal data regis- ters and their controlling logic circuitry The timing diagrams for updating the DAC output are shown in sections 11 12 and 13 for three possible control modes The method used depends strictly upon the particular application FIGURE 1 DAC1208 DAC1209 DAC1210 Functional Diagram TLH5690 – 6 FIGURE 2 DAC1230 DAC1231 DAC1232 Functional Diagram 6 |
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Similar Description - DAC1231LCJ-1 |
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