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AS1539/AS1541

Data Sheet - D e t a i l e d D e s c r i p t i o n

Where:

SD: Single-Ended/Differential Inputs

0: Differential Inputs

1: Single-Ended Inputs

C2, C1, C0: Channel Selections

PD1, PD0: Power-Down Selection

X: Unused

Powerdown Selection

Powerdown modes for the AS1539/AS1541 are selected by setting bits PD0 and PD1 of a command byte (see Com-

mand Byte on page 12).

Channel Selection

Channel selection for the AS1539/AS1541 is made using a command byte (see Command Byte on page 12).

Table 5. Powerdown Mode Bit Settings

PD1

PD0

Description

0

0

Powerdown between A/D converter conversions.

0

1

Internal reference off and A/D converter on.

1

0

Internal reference on and A/D converter off.

1

1

Internal reference on and A/D converter on.

Table 6. Channel Selection Bit Settings

1

1. For the 4-channel AS1541 only combinations of CH0:CH3 applies.

SD

C2

C1

C0

CH0

CH1

CH2

CH3

CH4

CH5

CH6

CH7

COM

0000

+IN

–IN

-------

0001

-

-

+IN

–IN

-----

0

0

1

0

-

-

-

-

+IN

–IN

-

-

-

0

0

1

1

-

-

-

-

-

-

+IN

–IN

-

0100

–IN

+IN

-------

0101

-

-

–IN

+IN

-----

0

1

1

0

-

-

-

-

–IN

+IN

-

-

-

0

1

1

1

-

-

-

-

-

-

–IN

+IN

-

1000

+IN

-------

–IN

1001

-

-

+IN

-----

–IN

1

0

1

0

-

-

-

-

+IN

-

-

-

–IN

1

0

1

1

-

-

-

-

-

-

+IN

-

–IN

1100

-

+IN

------

–IN

1101

-

-

-

+IN

----

–IN

1

1

1

0

-

-

-

-

-

+IN

-

-

–IN

1

1

1

1

-

-

-

-

-

-

-

+IN

–IN