DDC232 datasheet(19/35 Pages) TI2

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CONV

Continuous

Noncontinuous

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

CONV

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

Noncontinuous

Continuous

DDC232

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SBAS331D – AUGUST 2004 – REVISED APRIL 2010

is increased so that tINT is always ≥ tMRAZ as shown in

Changing Between Modes

Figure 16 (see Figure 13 and Table 11, page 18).

With a longer tINT, the m/r/az cycle has enough time

Changing from Cont to Ncont mode occurs whenever

to finish before the next integration begins and

tINT < tMRAZ. Figure 15 shows an example of this

continuous integration of the input signal is possible.

transition. In this figure, Cont mode is entered when

For the special case of the very first integration when

the integration on side A is completed before the

changing to the Cont mode, tINT can be < tMRAZ. This

m/r/az cycle on side B is complete. The DDC232

is allowed because there is no simultaneous m/r/az

completes the measurement on sides B and A during

cycle on the side B during state 3—therefore, there is

states 8 and 7 with the input signal shorted to ground.

no need to wait for it to finish before ending the

Ncont integration begins with state 6.

integration on side A.

Changing from Ncont to Cont mode occurs when tINT

Figure 15. Changing from Continuous Mode to Noncontinuous Mode

Figure 16. Changing from Noncontinuous Mode to Continuous Mode

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