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AD7768BSTZ Datasheet(PDF) 60 Page - Analog Devices

Part # AD7768BSTZ
Description  8-/4-Channel, 24-Bit, Simultaneous Sampling ADCs with Power Scaling, 110.8 kHz Bandwidth
PDF  106 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7768BSTZ Datasheet(HTML) 60 Page - Analog Devices

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Data Sheet
AD7768/AD7768-4
CIRCUIT INFORMATION
analog.com
Rev. C | 60 of 106
any reconfiguration of the device in SPI control mode, prior to
capturing ADC samples. After the SYNC_IN rising edge is provided,
there is a deterministic delay until the first new conversion result is
available, and until the first settled data is available. Table 28 and
Table 29 provide these delays, measured in MCLK cycles, for the
wideband and sinc5 filters, respectively, for each possible setting
of MCLK_DIV. Each table provides the delays for configurations
where all channels are using the exact same configuration (Group
B unused), and for configurations where one or more channels
have a different decimation rate applied (Group B is used).
For example, when the channels are configured with the wideband
filter and MCLK_DIV = MCLK/4, with some channels assigned to
Group A with decimate by 32 and other channels to Group B with
decimate by 64, then the delay until the first DRDY signal after the
SYNC_IN signal is 758 MCLK periods. All active channels output
the first data after 758 MCLK periods. However, due to differing
decimation rates across channels, in this case, the first settled data
is available for the Group A channels 8822 MCLK periods after the
SYNC_IN signal, and after 17,014 MCLK periods for the Group B
channels.
Table 28. Wideband Filter SYNC_IN to Settled Data (DCLK = MCLK)
MCLK_DIV
Setting
Filter Type
Decimation Factor
Delay from First MCLK Rise
After SYNC_IN Rise to First
DRDY Rise
Delay from First MCLK Rise After SYNC_IN Rise
to Earliest Settled Data DRDY Rise
MCLK Periods
Group A
Group B
Group A
Group B
MCLK Periods
Group A
Group B
MCLK/4
Wideband
Wideband
32
Unused
336
8400
Not applicable
Wideband
Wideband
64
Unused
620
16,748
Not applicable
Wideband
Wideband
128
Unused
1187
33,443
Not applicable
Wideband
Wideband
256
Unused
2325
66,837
Not applicable
Wideband
Wideband
512
Unused
4601
133,625
Not applicable
Wideband
Wideband
1024
Unused
9153
267,201
Not applicable
Wideband
Wideband
32
32
758
8822
8822
Wideband
Wideband
32
64
758
8822
17,014
Wideband
Wideband
32
128
758
8822
33,526
Wideband
Wideband
32
256
758
8822
66,934
Wideband
Wideband
32
512
758
8822
133,622
Wideband
Wideband
32
1024
758
8822
267,253
Wideband
Wideband
64
32
759
17,015
8823
Wideband
Wideband
128
32
760
33,528
8824
Wideband
Wideband
256
32
762
66,938
8826
Wideband
Wideband
512
32
782
133,646
8846
Wideband
Wideband
1024
32
806
267,302
8870
MCLK/8
Wideband
Wideband
32
Unused
656
16,784
Not applicable
Wideband
Wideband
64
Unused
1225
33,481
Not applicable
Wideband
Wideband
128
Unused
2359
66,871
Not applicable
Wideband
Wideband
256
Unused
4635
133,659
Not applicable
Wideband
Wideband
512
Unused
9187
267,235
Not applicable
Wideband
Wideband
1024
Unused
18,291
534,387
Not applicable
Wideband
Wideband
32
32
820
16,948
16,948
Wideband
Wideband
32
64
820
16,948
33,588
Wideband
Wideband
32
128
820
16,948
66,868
Wideband
Wideband
32
256
820
16,948
133,684
Wideband
Wideband
32
512
820
16,948
267,316
Wideband
Wideband
32
1024
820
16,948
534,580
Wideband
Wideband
64
32
822
33,590
16,950
Wideband
Wideband
128
32
824
66,872
16,952
Wideband
Wideband
256
32
844
133,708
16,972



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