DDC112YSLASH2K datasheet(19/34 Pages) TI

19 / 34 page

DDC112

SBAS085B

www.ti.com

CONV

Non-Continuous

Continuous

State

mbsy

m/r/az

Status

Integration

Status

m/r/az A

m/r/az B

m/r/az A

Int B

Int A

Integrate A

Integrate B

FIGURE 18. Changing from Continuous Mode to Non-Continuous Mode.

FIGURE 19. Changing from Non-Continuous Mode to Continuous Mode.

CONV

Continuous

Non-Continuous

State

Integration

Status

m/r/az

Status

mbsy

m/r/az B

m/r/az A

m/r/az B

m/r/az A

m/r/az B

Integrate A

Integrate B

Int A

Int B

Changing Between Modes

Changing from the cont to ncont mode occurs whenever

TINT < t6. Figure 18 shows an example of this transition.

In this figure, the cont mode is entered when the integration

on side A is completed before the m/r/az cycle on side B is

complete. The DDC112 completes the measurement on

sides B and A during states 8 and 7 with the input signal

shorted to ground. Ncont integration begins with state 6.

Changing from the ncont to cont mode occurs when TINT is

increased so that TINT is always ≥ t6 (see Figure 14). With a

longer TINT, the m/r/az cycle has enough time to finish before

the next integration begins and continuous integration of the

input signal is possible. For the special case of the very first

integration when changing to the cont mode, TINT can be

< t6. This is allowed because there is no simultaneous

m/r/az cycle on the side B during state 3—there is no need

to wait for it to finish before ending the integration on side A.

DDC112Y/2K Datasheet(PDF) 19 Page - Texas Instruments

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