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

OPERATION WITH DUAL POSITIVE POWER SUPPLIES

For the dual positive supplies operation, VCC = +10 V, VDD = 5 V, VEE = 0 V and analog output zero level is to be referenced to (VCC +

VEE) /2 by setting the AGND pin to 5 V.

MICROPROCESSOR INTERFACE

A0 to A23

ADDRESS BUS

AS

VMA

MC68000

UPA

UDS

DB0 to DB15

CS

ADDRESS

DECODER

1/4 7HC125

16

CLK LD

SDI

MP7641

RST

DB0

16

FROM SYSTEM RESET

DATA BUS

Figure 4. MC68000 Interface (Simplified Diagram)

16

A0 to A15

MC6800

02

R/W

8

DB0 to DB7

1 ADDRESS BUS

3

E1 A0 to A2

74LS138

E3

ADDRESS

E2 DECODER

8

DATA BUS

LD

CLK

DB7

SDI

MP7641

RST

FROM SYSTEM RESET

NOTES:

1. Execute consecutive memory write instructions while manipulating the data between WRITEs so that

each WRITE presents the next bit

2. The serial data loading is triggered by the CLK pulse which is asserted by a decoded memory WRITE

location 2000, R/W, and 02. A WRITE to address 4000 transfers data from the input shift register to the

DAC register.

Figure 5. MC6800 Interface (Simplified Diagram)

Rev. 2.00

10

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