MP7542 查看數據表（PDF） - Exar Corporation

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MP7542

5 V CMOS 4-Bit Input, 12-Bit Digital-to-Analog Converter

Exar Corporation 

MP7542

APPLICATION NOTES

Refer to Section 8 for Applications Information

Interface Logic Information

The MP7542 is designed to interface as a memory-mapped

output device.

A typical system configuration is shown below. CS is the de-

coded device address, and is derived by decoding the 14 higher

order address bits. A0 and A1 are the MP7542 operation ad-

dress bits, and are decoded internally in the MP7542 to point to

the desired loading operation (i.e. load high byte, middle byte,

low byte or DAC register). See Table 1.

All data loading operations are identical to the write cycle of a

RAM.

Additionally, the CLR input allows the MP7542 DAC register

to be cleared asynchronously to 0000 0000 0000. When operat-

ing the MP7542 in a unipolar mode a CLEAR sets the DAC out-

put to zero scale output. In the bipolar mode a CLEAR causes

the DAC output to go to –VREF.

In summary:

1. The MP7542 DAC register can be asynchronously

cleared with the CLR input.

2. Each MP7542 requires only 4 bits of memory.

3. Any of the four basic loading operations (i.e. load low

byte data register, middle byte data register, high byte

data register or 12-bit DAC register) are accomplished

by executing a memory WRITE operation to the applica-

ble address location for the required DAC operation.

ADDR (8)

8085

ALE

or comparable

WR

8212

ADDRESS BUS (16)

A0-15

A0

A1

A2 - 15

Address

Decode

ADDR/DATA

(8) AD0-7

DATA

AD0 AD1 AD2 AD3

+5 V

A0 A1 WR CS

DB3

DB2

MP7542

DB1

DB0

CLR

FROM SYSTEM RESET

ADDRESS (16)

DECODED A2 - 15

USED AS

CHIP SELECT

DATA (8)

Figure 2. 8085/MP7542 Interface (Memory Mapped Output)

Rev. 2.00

6

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