5

LTC1657L

CLR

CSMSB

CSLSB

WR

LDAC

FUNCTION

L

X

X

X

X

Clears input and DAC registers to zero

H

X

X

X

L

Loads DAC register with contents of input registers

H

X

X

X

H

Freezes contents of DAC register

H

L

H

L

X

Writes MSB byte into MSB input register

H

H

L

L

X

Writes LSB byte into LSB input register

H

L

L

L

X

Writes MSB and LSB bytes into MSB and LSB input registers

H

X

X

H

X

Inhibits write to MSB and LSB input registers

H

H

X

X

X

Inhibits write to MSB input register

H

X

H

X

X

Inhibits write to LSB input register

H

L

L

L

L

Data bus flows directly through input and DAC registers

CSMSB

WR

LDAC

1657 TD

CSLSB

DATA

DAC UPDATE

DATA VALID

DATA VALID