Datasheet

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      
    
SLAS251A − DECEMBER 1999 − REVISED JANUARY 2003
16
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
modes using the FIFO: modes 01, 10, 11 timing (continued)
CS
CSTART
SDI
INT
SDO
Hi-Z
FS
(DSP)
Configure Select
Conversion #1 From Channel 2
Select
Conversion #4 From Channel 2
Read FIFO
First FIFO Read
‡‡‡ ‡ §
#1 #2 #3 #4
†
§
t
(sample)
Hi-Z
Sample Times ≥ MIN t
(sample)
(See Operating Characteristics)
t
(sample)
t
(sample)
t
(sample)
¶
†
Command = Configure write for mode 01, FIFO threshold = 1/2
‡
Command = Read FIFO, 1st FIFO read
§
Command = Select ch2.
¶
Minimum CS
low time for select cycle is 6 SCLKs. The same amount of time is required between FS low to CSTART for proper channel decoding.
The low time of CSTART
, not overlapped with CS low time, is the valid sampling time for the select cycle (see Figure 18).
Figure 11. TLV1504/TLV1508 Mode 01 µp/DSP Serial Interface (Conversions Triggered by CSTART)
CS
CSTART
SDI
INT
SDO
From Channel 0
FS
(DSP)
From Channel 3
Configure
Conversion
Conversion
Read FIFO #1 #2 #3 #4
Top of FIFO
‡
‡
†
‡‡‡
Read FIFO #1
From Channel 0
Conversion
From Channel 3
Conversion
Repeat
Second FIFO Read
Repeat
First FIFO Read
§ § § § § § § §
†
Command = Configure write for mode 10 or 11, FIFO threshold = 1/2, sweep seq = 0−1−2−3.
‡
Command = Read FIFO
§
Use any channel select command to trigger SDI input.
Figure 12. TLV1504/TLV1508 Mode 10/11 DSP Serial Interface (Conversions Triggered by FS)