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
27
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
conversion operation (continued)
1st Sweep
1st FIFO Read
Configure
2nd FIFO Read
***
CH0 CH1 CH2 CH3
CH0
* * * * *
Hi-Z
*** Command = Configure Write for Mode 10, FIFO
Threshold = 1/2 Full, Sweep Sequence: 0–1–2–3
** COMMAND = Select Any Channel
* COMMAND = Read FIFO
** ** ** ** ** ** ** **
Conversion
From CH0
Conversion
From CH3
Conversion
From CH0
Conversion
From CH3
2nd Sweep
Using Existing
Configuration
Read FIFO After FIFO Threshold Is Hit
CS
FS
SDI
INT
SDO
Don’t Care
Figure 17. Mode 10, FS Initiates Operations
1st Sweep
1st FIFO Read
Configure
2nd FIFO Read
Hi-Z
*** Command = Configure Write for Mode 10, FIFO
Threshold = 1/2 Full, Sweep Sequence: 0–0–2–2
** COMMAND = Select Any Channel
* COMMAND = Read FIFO
Conversion
From CH0
Conversion
From CH2
Conversion
From CH0
Conversion
From CH2
2nd Sweep
Using Existing
Configuration
Read FIFO After FIFO Threshold Is Hit, FS Initiates Select Period
CS Tied
to Low
FS
SDI
INT
***
CH0 CH0 CH2 CH2
CH0
* * * * ***
SDO
**
CSTART
Don’t Care
Figure 18. Mode 10, CSTART Initiates Operations
START 2nd Round SWEEP CONVERSION,
the DATA of the 1st Round Are Lost
CS
FS=High
SDI
INT
SDO
READ the DATA of 2nd
Sweep From FIFO
CH1 CH3CH2CH0
START 2nd Sweep conversion immediately (NO FIFO READ) after the 1st SWEEP completed.
***
*** Command = Configure Write for Mode 11, FIFO
Threshold = 1/2 Full, Sweep Sequence: 0–1–2–3
** COMMAND = Select Any Channel
* COMMAND = Read FIFO
**** ** ** ** ** ** ** * * * * **
Configure
Conversion
From CH0
Conversion
From CH3
Conversion
From CH3
Conversion
From CH0
Conversion
From CH0
Don’t Care
Figure 19. Mode 11, CS Initiates Operations