AD4134 datasheet(48/92 Pages) AD

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Data Sheet

AD4134

DEVICE CONFIGURATION

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Rev. 0 | 48 of 92

PROGRAMMING OUTPUT DATA RATE AND

CLOCK

Output Data Rate

AD4134 can be programmed to any output data rate from 10 SPS

to 1496 kSPS. Depending on the MODE pin configuration, the ODR

can be generated by the AD4134 or provided externally. When the

AD4134 generates the ODR, the mode is called master mode, and

when ODR is provided externally, the mode is called slave mode.

Table 26. Mode Pin Configuration

MODE Pin

ASRC Mode of Operation

ODR Pin Direction

Slave

Input

Master

Output

ASRC Slave Mode

In ASRC slave mode, the ODR is controlled by a continuous exter-

nal pulse signal connected to the ODR pin, with the ODR equal

to the pulse frequency. This feature gives the user the flexibility

to update the frequency of the external pulse dynamically, which

changes the ODR value, but there is a loss of data during a change

over time plus the filter settling time. The change over time is

dominated by the unlocking and locking of the PLL that tracks the

ODR. For ODR values of >10 kSPS, a change of ODR value to

less than 500 SPS does not cause the PLL to unlock and lock back

again, allowing seamless data. Refer to Table 27 for change over

time for ODR ranges for various filters in slave mode.

For Example 1, if the user changes the ODR value from 300 kSPS

to 2500 SPS while using the digital FIR filter, the change over time

is 22 ms + 512/2500 = 226.8 ms.

For Example 2, if the user changes the ODR value from 1 MSPS to

500 kSPS while using a sinc3 digital filter, the change over time is

11 ms + 512/500,000 = 12 ms.

The supported ODR range varies by the power mode and the digital

filter type selected (see Table 19 for more details).

Table 27. ODR Change Over Time in Slave Mode

ODR Range

FIR

Sinc6

Sinc3

750 kHz to 1.46 MHz

Not applicable

5.5 ms + 512/ODR

374 kHz to 750 kHz

Not applicable

11 ms + 512/ODR

365 kHz to 374 kHz

ODR range not supported in slave mode

22 ms + 512/ODR

2.5 kHz to 365 kHz

22 ms + 512/ODR

1.46 kHz to 2.5 kHz

Not applicable

22 ms + 512/ODR

732 SPS to 1.46 kHz

Not applicable

44 ms + 512/ODR

366 SPS to 732 SPS

Not applicable

88 ms + 512/ODR

183 SPS to 366 SPS

Not applicable

6 sec + 512/ODR

91.5 SPS to 183 SPS

Not applicable

12 sec + 512/ODR

45.7 SPS to 97.5 SPS

Not applicable

24 sec + 512/ODR

22.8 SPS to 45.7 SPS

Not applicable

48 sec + 512/ODR

11.4 SPS to 22.8 SPS

Not applicable

96 sec + 512/ODR

10 SPS to 11.4 SPS

Not applicable

192 sec + 512/ODR

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