THS1209 Datasheet, PDF (26/33 Pages) Texas Instruments – 12-BIT, 2 ANALOG INPUT, 8MSPS, SIMULTANEOUS SAMPLING ANALOG-TO-DIGITAL CONVERTER

THS1209
SLAS288B – JULY 2000 – REVISED DECEMBER 2002
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Read Timing (using R/W, CS0-controlled)
Figure 5 shows the read-timing behavior when the WR(R/W) input is programmed as a combined read-write input
R/W. The RD input has to be tied to high-level in this configuration. This timing is called CS0-controlled because CS0
is the last external signal of CS0, CS1, and R/W which becomes valid. The reading of the data should be done with
a certain timing relative to the conversion clock CONV_CLK, as illustrated in Figure 31.
tsu(CONV_CLKL_–CSOL)
tsu(CSOH_{–CONV_CLKL)}
CONV_CLK
10%
10%
tw(CS)
90%
CS0
10%
10%
CS1
ÓÓÓÓÓÓ _R/W
90%
RD
D(0–11)
tsu(R/W)
ta
90%
ÔÔÔÔÔÔÔÔ ^th(R/W)
90%
th
90%
Figure 31. Read Timing Diagram Using R/W (CS0-controlled)
Read Timing Parameter (CS0-controlled)⁽¹⁾
PARAMETER
MIN
tsu(CONV_CLKL_CSOL) Setup time, CONV_CLK low before CS valid
10
tsu(CSOH_{–CONV_CLKL)} Setup time, CS invalid to CONV_CLK low
20
tsu(R/W)
Setup time, R/W high to last CS valid
0
ta
Access time, last CS valid to data valid
0
th
Hold time, first CS invalid to data invalid
0
th(R/W)
Hold time, first external CS invalid to R/W change
5
tw(CS)
Pulse duration, CS active
10
(1) _{CS = CSO}
TYP MAX UNIT
ns
ns
ns
10 ns
5 ns
ns
ns
26