Datasheet

TLC3544, TLC3548
5-V ANALOG, 3-/5-V DIGITAL, 14-BIT, 200-KSPS, 4-/8-CHANNELS SERIAL
ANALOG-TO-DIGITAL CONVERTERS WITH 0-5 V (PSEUDODIFFERENTIAL) INPUTS
SLAS266C – OCTOBER 2000 – REVISED MAY 2003
26
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
conversion operation (continued)
***
Hi-Z
**
**
Data Lost
Hi-Z
** Select Channel
Possible
Signal
t
(sample)
t
(convert)
Select Channel
16 SCLK
Select Channel
16 SCLK
Previous Conversion Result
CS Tied to Low
CSTART
FS
SDI
INT
EOC
SDO
Hi-Z
OR
Conversion Result
Don’t Care
Possible Signal
Figure 14. Mode 00, CSTART Triggers Sampling/Conversion, FS Initiates Select
**
Hi-Z
*** *
**
*
* *
Select CH1
Select CH2
1/4 FIFO FULL 1/4 FIFO FULL
Don’t Care
*** –– WRITE CFR
** –– Select Channel
* –– FIFO Read
**
**
Select Any
Channel
Select Any
Channel
Possible Signal
DATA1 of CH1 DATA2 of CH1
MODE 01, FS Activates Conversion, FIFO Threshold = 1/4 Full
Read FIFO After Threshold Is Hit
CS
FS
SDI
SDO
INT
DATA1 of CH2 DATA2 of CH2
Figure 15. Mode 01, FS Initiates Operations
**
Hi-Z
*** *
**
* * *
1/4 FIFO FULL
1/4 FIFO FULL
Don’t Care
*** –– WRITE CFR
** –– Select Channel
* –– FIFO Read
Select CH1 Select CH2
DATA1 of CH1 DATA2 of CH1 DATA1 of CH2 DATA2 of CH2
MODE 01, FS Initiates Select Period, CSTART
Activates Conversion, FIFO Threshold = 1/4 Full,
Read FIFO After Threshold Is Hit
CS
FS
CSTART
SDI
SDO
INT
Possible Signal
Figure 16. Mode 01, CSTART Triggers Samplings/Conversions