MP7641AS データシートの表示（PDF） - Exar Corporation

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MP7641AS

8-Channel Voltage Output 10 MHz Input Bandwidth 8-Bit Multiplying DACs with Serial Digital Port

Exar Corporation 

MP7641

8085

ALE

WR

SOD

8

8

8212

8

ADDRESS BUS

+5

E1

E3

E2

3

A0 to A2

74LS138

ADDRESS

DECODER

DATA BUS

LD

SDI

CLK

MP7641

RST

FROM SYSTEM RESET

Figure 6. 8085 Interface (Simplified Diagram)

NOTES:

1. Clock generated by WR and decoding address 8000

2. Data is clocked into the DAC shift register by executing memory write instructions. the clock input is

generated by decoding address 8000 and WR. Data is then loaded into the DAC register with a memory

write instruction to address 4000.

3. Serial data must be present in the right justified format in registers H & L of the microprocessor.

Rev. 2.00

11

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