Dual, Audio, Log Taper Digital Potentiometers

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7

8-BIT SERIAL WORD

A0

A1

A2

D4–D0

FUNCTION

0

0

0

5-bit DAC data

Set position of wiper W0A

0

0

1

5-bit DAC data

Set position of wiper W0B

0

1

0

5-bit DAC data

Set position of wiper W1A

0

1

1

5-bit DAC data

Set position of wiper W1B

100

4-bit mute data, D0 = “don’t care”

Data for mute register (see Table 4)

101

4-bit zero-crossing detection data,

D0 = “don’t care”

Data for zero-crossing detection register

(see Table 6)

1

1

0

00000

Readback contents of wiper register for W0A at DOUT

1

1

0

00001

Readback contents of wiper register for W0B at DOUT

1

1

0

00010

Readback contents of wiper register for W1A at DOUT

1

1

0

00011

Readback contents of wiper register for W1B at DOUT

1

1

0

00100

Readback contents of mute register at DOUT

1

1

0

00101

Readback contents of zero-crossing detection register at DOUT

1

1

1

D4 = 0, D3–D0 = “don’t care”

Analog power-down

1

1

1

D4 = 1, D3–D0 = “don’t care”

Analog power-up

Table 2. Serial Interface Programming Commands for MAX5409/MAX5411

DATA BIT

VALUE

FUNCTION

0

Set wiper W0A to preprogrammed value (-62dB on power-up)

D4

1

Set wiper W0A to mute (-90dB)

D3

“don’t care”

No change

0

Set wiper W1A to preprogrammed value (-62dB on power-up)

D2

1

Set wiper W1A to mute (-90dB)

D1

“don’t care”

No change

D0

“don’t care”

No change

Table 3. Mute Register Bit Definitions for MAX5408/MAX5410

DATA BIT

VALUE

FUNCTION

0

Set wiper W0A to preprogrammed value (-62dB on power-up)

D4

1

Set wiper W0A to mute (-90dB)

0

Set wiper W0B to preprogrammed value (-62dB on power-up)

D3

1

Set wiper W0B to mute (-90dB)

0

Set wiper W1A to preprogrammed value (-62dB on power-up)

D2

1

Set wiper W1A to mute (-90dB)

0

Set wiper W1B to preprogrammed value (-62dB on power-up)

D1

1

Set wiper W1B to mute (-90dB)

D0

“don’t care”

No change

Table 4. Mute Register Bit Definitions for MAX5409/MAX5411