www.ti.com

DAC8574

SLAS377B – JANUARY 2003 – REVISED DECEMBER 2004

EXAMPLE 11: Simultaneous Update of All Channels

Write 4/4 Scale, 4/3 Scale, 2/4 Scale, and 1/4 Scale Data to Temporary Registers of Channels A, B, C, D Serially, and Update all

DACs Simultaneously

ADDRESS [7...0]

C [7...0]

M [7...0]

L [7...0]

START

1001 1000

ACK

0000 0000

ACK

1111 1111

ACK

1111 1111

ACK

STOP

Previous DAC output voltages are valid for all channels

START

1001 1000

ACK

0000 0010

ACK

1100 0000

ACK

0000 0000

ACK

Previous DAC output voltages are valid for all channels

START

1001 1000

ACK

0000 0100

ACK

1000 0000

ACK

0000 0000

ACK

Previous DAC output voltages are valid for all channels

START

1001 1000

ACK

0010 0110

ACK

0100 0000

ACK

0000 0000

ACK

Previous DAC output voltages are valid for all channels

New data is valid

EXAMPLE 12: Simultaneous Update Channels A, B, C and Power-Down of Channel D at The End of The Fourth Cycle

Write 4/4 Scale, 3/4 Scale, 2/4 Scale, and Power-Down (Hi-Z) Data to Temporary Registers of Channels A, B, C, D Serially, and

Update Simultaneously

ADDRESS [7...0]

C [7...0]

M [7...0]

L [7...0]

START

1001 1000

ACK

0000 0000

ACK

1111 1111

ACK

1111 1111

ACK

STOP

Previous DAC output voltages are valid for all channels

START

1001 1000

ACK

0000 0010

ACK

1100 0000

ACK

0000 0000

ACK

STOP

Previous DAC output voltages are valid for all channels

START

1001 1000

ACK

0000 0100

ACK

1000 0000

ACK

0000 0000

ACK

STOP

Previous DAC output voltages are valid for all channels

START

1001 1000

ACK

0010 0111

ACK

0000 0000

ACK

0000 0000

ACK

STOP

Previous DAC output voltages are valid for all channels

New data is valid

EXAMPLE 13: Store data and wait for update command (Write codes 128, 256, 512, and 1024 to temporary registers of channels A,

B, C, D)

Write 4/4 Scale, 3/4 Scale, 2/4 Scale, and 1/4 Scale Data to Temporary Registers of Channels A, B, C, D Serially, and Update all

DACs Simultaneously

ADDRESS [7...0]

C [7...0]

M [7...0]

L [7...0]

START

1001 1000

ACK

0000 0000

ACK

0000 0000

ACK

1000 0000

ACK

STOP

Previous DAC output voltages are valid for all channels

START

1001 1000

ACK

0000 0010

ACK

0000 0001

ACK

0000 0000

ACK

STOP

Previous DAC output voltages are valid for all channels

START

1001 1000

ACK

0000 0100

ACK

0000 0010

ACK

0000 0000

ACK

STOP

Previous DAC output voltages are valid for all channels

START

1001 1000

ACK

0010 0110

ACK

0100 0100

ACK

0000 0000

ACK

STOP

Previous DAC output voltages are valid for all channels

36