TLV1570

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

SERIAL ANALOG-TO-DIGITAL CONVERTER

SLAS169B – DECEMBER 1997– REVISED OCTOBER 2000

7

POST OFFICE BOX 655303

initialization-software sequence (continued)

Example 3. Auto-Scan Mode

This example shows a change in sequence in the middle of the current sequence. The following shows that after

the initial autoscan reset, a reset is not necessary again when switching channel sequences.

CYCLE

WRITE TO

SDIN

CHANNEL

SAMPLED

OUTPUT FROM

SDOUT

COMMENT

1st

0480h

N/A

N/A

No analog input channel sampled

2nd

0480h

N/A

N/A

Autoscan reset enabled, no analog input channel sampled

3rd

0400h

0

From Channel 0

Start of sequence 0

4th

0700h

1

From Channel 1

Enable channel sequence 3 (no auto-scan reset required)

5th

0700h

7

From Channel 7

Start of sequence 3

6th

0700h

6

From Channel 6

7th

0700h

5

From Channel 5

8th

0700h

4

From Channel 4

9th

0700h

3

From Channel 3

10th

0700h

2

From Channel 2

11th

0700h

1

From Channel 1

12th

0700h

0

From Channel 0

Example 4. Auto-Scan Mode

This example shows a switch in sequence in the course of a sequence. The following shows that a particular

sequence does not have to be continued if remaining channels do not need to be sampled (i.e., only channel

1 through channel 5 sampled, not channels 6, 7, 8)

CYCLE

WRITE TO

SDIN

CHANNEL

SAMPLED

OUTPUT FROM

SDOUT

COMMENT

1st

0480h

N/A

N/A

No analog input channel sampled

2nd

0480h

N/A

N/A

Autoscan reset enabled, 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

0480h

5

From Channel 5

Autoscan reset enabled

9th

0400h

0

From Channel 0

Sequence is reset to channel 0

10th

0400h

1

From Channel 1

11th

0400h

2

From Channel 2

The TLV1570 is a 800-ns 10-bit 8-analog input channel analog-to-digital converter with a throughput of up to

1.25 MSPS at 5 V and up to 625 KSPS at 3 V respectively. To run at its fastest conversion rate, it must be clocked

at 20 MHz at 5-V or 10 MHz at 3-V. The TLV1570 can be easily interfaced to microcontrollers, ASICs, DSPs,

or shift registers. The TLV1570 serial interface is designed to be fully compatible with serial peripheral interface

(SPI) and TMS320 DSP serial ports. No additional hardware is required to interface between the TLV1570 and

a microcontroller (

µCs) with a SPI serial port or a TMS320 DSP. However, the speed is limited by the SCLK rate

of the

µC or the DSP.