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ADS7890IPFBTG4 Datasheet(PDF) 11 Page - Texas Instruments

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No. de pieza ADS7890IPFBTG4
Descripción Electrónicos  14-BIT, 1.25-MSPS LOW POWER SAR ANALOG-TO-DIGITAL CONVERTER
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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ADS7890IPFBTG4 Datasheet(HTML) 11 Page - Texas Instruments

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ADS7890
SLAS409 − DECEMBER 2003
www.ti.com
11
2
3
9
2
3
15
16
D12
MSB-D13
MSB-D13
LSB-D0
Data From Last Conversion
SCLK
FS
CS
BUSY
SDO
Figure 9. Frame Abort Using CS Before Sample Start
The rising edge of FS (see Figure 10) or rising edge of CS (see Figure 11) during a sample period (td8 after the
9th rising edge of SCLK) to the 16th falling edge of SCLK aborts the sample and the device enters the
conversion phase, this also aborts the current data out operation on SDO (if aborted before 14th clock). As
expected, SDO goes to three-state with CS high. The conversion results can be latched in the next frame,
however reliability of the data depends on the sampling time available before the frame abort.
MSB− D13
D12
LSB−D0
td8
2
3
9
10
16
SCLK
FS
BUSY
CS
SDO
(Held Low)
Figure 10. Frame Abort Using FS During Sample
MSB− D13
D12
2
3
9
10
16
td8
SCLK
FS
BUSY
CS
SDO
Figure 11. Frame Abort Using CS During Sample
The rising edge of FS during a conversion (from BUSY high until the end of t(conv) as shown in Figure 12) aborts
the ongoing conversion. This starts the next frame. The device outputs 3F80 (hex) on SDO during the first frame
after the conversion abort. Toggling CS during a conversion (with FS low) does not have any effect on the
conversion.


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