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AD7777 データシート(PDF) 8 Page - Analog Devices |
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AD7777 データシート(HTML) 8 Page - Analog Devices |
8 / 12 page AD7776/AD7777/AD7778 –8– REV. 0 Microprocessor Interfacing Circuits The AD7776/AD7777/AD7778 family of ADCs is intended to interface to DSP machines such as the ADSP-2101, ADSP-2105, the TMS320 family and microcontrollers such as the 80C196 family. Figure 7 shows the AD7776/AD7777/AD7778 interfaced to the TMS320C10 @ 20.5 MHz and the TMS320C14 @ 25 MHz. Figure 8 shows the interface with the TMS320C25 @ 40 MHz. Note that one wait state is required with this interface. The ADSP-2101-50 and the ADSP-2105-40 interface is shown in Figure 9. One wait state is required with either of these machines. * ADDITIONAL PINS OMITTED FOR CLARITY ADDR DECODE ADDRESS BUS DATA BUS D15–D0 TMS320C10-20.5 TMS320C14-25 A11–A0 WE (C10) DEN (C14) REN CS DB9–DB0 AD7776/7/8* RD WR Figure 7. AD7776/AD7777/AD7778 to TMS320C10 and TMS320C14 Interface ADDRESS BUS DATA BUS * ADDITIONAL PINS OMITTED FOR CLARITY CS DB9–DB0 AD7776/7/8* RD WR ADDR DECODE D15–D0 A15–A0 IS READY MSC STRB R/W TMS320C25-40 Figure 8. AD7776/AD7777/AD7778 to TMS320C25 Interface Figure 10 shows the interface with the 80C196KB @ 12 MHz and the 80C196KC @ 16 MHz. One wait state is required with the 16 MHz machine. The 80C196 is configured to operate with a 16-bit multiplexed address/data bus. Table I gives a truth table for the AD7776/AD7777/AD7778 and summarizes their microprocessor interfacing features. Note that a read instruction to any of the devices while a conversation is in progress will immediately stop that conversion and return unreliable data over the data bus. * ADDITIONAL PINS OMITTED FOR CLARITY ADDRESS BUS DATA BUS CS DB9–DB0 AD7776/7/8* RD WR D23–D6 A13–A0 WR RD DMS ADSP-2101-50 ADSP-2105-40 ADDR DECODE EN Figure 9. AD7776/AD7777/AD7778 to ADSP-2101 and ADSP-2105 Interface * ADDITIONAL PINS OMITTED FOR CLARITY DATA BUS (10) CS DB9–DB0 AD7776/7/8* RD WR ADDR DECODER '373 LATCH ADDRESS BUS AD7–AD0 (PORT 3) AD15–AD6 (PORT 4) WR RD 80C196KB-12 80C196KC-16 ALE Figure 10. AD7776/AD7777/AD7778 to 80C196 Interface |
同様の部品番号 - AD7777 |
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同様の説明 - AD7777 |
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