TLV5618A

2.7-V TO 5.5-V LOW-POWER DUAL 12-BIT

DIGITAL-TO-ANALOG CONVERTER WITH POWER DOWN

SLAS230H – JULY 1999 – REVISED JULY 2002

11

POST OFFICE BOX 655303

APPLICATION INFORMATION

data format

The 16-bit data word for the TLV5618A consists of two parts:

(D15..D12)

(D11..D0)

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

R1

SPD

PWR

R0

MSB

12 Data bits

LSB

SPD: Speed control bit

1

→ fast mode

0

→ slow mode

PWR: Power control bit

1

→ power down

0

→ normal operation

On power up, SPD and PWD are reset to 0 (slow mode and normal operation)

The following table lists all possible combinations of register-select bits:

register-select bits

R1

R0

REGISTER

0

0

Write data to DAC B and BUFFER

0

1

Write data to BUFFER

1

0

Write data to DAC A and update DAC B with BUFFER content

1

1

Reserved

The meaning of the 12 data bits depends on the register. If one of the DAC registers or the BUFFER is selected,

then the 12 data bits determine the new DAC value:

examples of operation

Write new DAC A value and update DAC A output:

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

1

1

0

0

New DAC A output value

The DAC A output is updated on the rising clock edge after D0 is sampled.

Write new DAC B value to BUFFER and update DAC B output:

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

0

1

0

0

New BUFFER content and DAC B output value

The DAC A output is updated on the rising clock edge after D0 is sampled.

1.

Write data for DAC B to BUFFER:

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

0

0

0

1

New DAC B value

2.

Write new DAC A value and update DAC A and B simultaneously:

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

1

0

0

0

New DAC A value