TLV1570

2.7 V TO 5.5 V 8-CHANNEL 10-BIT 1.25-MSPS

SERIAL ANALOG-TO-DIGITAL CONVERTER

SLAS169A – DECEMBER 1997– REVISED SEPTEMBER 1998

6

POST OFFICE BOX 655303

initialization-software sequence

This sequence shows the default settings, unless otherwise specified. The ADC requires that the user write to

it every cycle. There is a cycle delay before control bits are implemented.

Example 1. Normal Sample Mode With Internal Reference

CYCLE

WRITE TO

SDIN

CHANNEL

SAMPLED

OUPUT FROM

SDOUT

COMMENT

1st

0040h

N/A

Invalid

No analog input channel sampled

2nd

01C0h

N/A

Invalid

No analog input channel sampled

3rd

0040h

3

From Channel 3

4th

8040h

0

From Channel 0

Software power down enabled

5th

0040h

N/A

Invalid

Software power down mode, no analog input channel sampled

Wait 800 ns

Recovery time, no analog input channel sampled (16 SCLKs if AVDD = 5 V and

fCLK = 20 MHz)

6th

0140h

N/A

Invalid

Recovery time, no analog input channel sampled

7th

0040h

2

From Channel 2

Example 2. Auto Scan Mode

CYCLE

WRITE TO

SDIN

CHANNEL

SAMPLED

OUTPUT FROM

SDOUT

COMMENT

1st

0480h

N/A

Invalid

Auto-scan reset enabled, no analog input channel sampled

2nd

0480h

N/A

Invalid

No analog input channel sampled

3rd

0400h

0

From Channel 0

4th

0400h

1

From Channel 1

5th

0400h

2

From Channel 2

6th

0400h

3

From Channel 3

7th

0400h

4

From Channel 4

8th

0400h

5

From Channel 5

9th

0400h

6

From Channel 6

10th

0400h

7

From Channel 7

11th

0400h

0

From Channel 0

NOTE: If software power down is enabled during auto-scan mode, the next channel in the sequence is skipped.