DDC232 datasheet(22/35 Pages) TI2

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INT

* tCMDR ) tSDCV

(20

32)t

DCLK

1000ms * 286.8ms

(640)(100ns)

+ 11.14 ³ 11 DDC232

…

Side B

Data

Side A

Data

INT

CMDR

SDCV

CONV

DVALID

DCLK

DOUT

DDC232

SBAS331D – AUGUST 2004 – REVISED APRIL 2010

www.ti.com

RETRIEVAL BEFORE CONV TOGGLES

(CONTINUOUS MODE)

(1)

Data retrieval before CONV toggles is the most

NOTE: (16 × 32)tDCLK is used for Format = 0, where

straightforward method. Data retrieval begins soon

tDCLK is the period of the data clock. For example, if

after DVALID goes low and finishes before CONV

tINT = 1000ms and DCLK = 10MHz, the maximum

toggles,

shown

Figure

20.

For

best

number of DDC232s with Format = 1 is shown in

performance, data retrieval must stop tSDCV before

Equation 2:

CONV toggles. This method is most appropriate for

longer integration times. The maximum time available

for readback is tINT – tCMDR – tSDCV.

(2)

For DCLK = 10MHz and CLK = 5MHz, the maximum

(or 13 for Format = 0)

number of DDC232s that can be daisy-chained

together (Format = 1) is calculated by Equation 1:

Figure 20. Readback Before CONV Toggles

Table 15. Timing Characteristics for Readback

SYMBOL

DESCRIPTION

MIN

TYP

MAX

UNITS

tSDCV

Data Retrieval Shutdown Before or After Edge of CONV

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