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ADS7890 Datasheet(PDF) 10 Page - Texas Instruments

Part # ADS7890
Description  14-BIT, 1.25-MSPS LOW POWER SAR ANALOG-TO-DIGITAL CONVERTER
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

ADS7890 Datasheet(HTML) 10 Page - Texas Instruments

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ADS7890
SLAS409 − DECEMBER 2003
www.ti.com
10
D12
D13
td8
23
9
10
16
SCLK
CS
BUSY
SDO
Figure 6. Frame Abort During Sample
The falling edge of CS during a conversion (from BUSY high until the end of t(conv) as shown in Figure 7) aborts
the ongoing conversion. This starts the next frame. The device outputs 3F80 (hex) on SDO during the first frame
after the conversion abort.
MSB
Busy Fall Without
Conversion Abort
2
3
15
16
1
2
3
4
5
tw2
td4
t(CONV)
3F80 (hex)
SCLK
CS
BUSY
SDO
Figure 7. Frame Abort During Conversion
FRAME ABORT IN DSP INTERFACE MODE
The rising edge of FS (see Figure 8) or the rising edge of CS (see Figure 9) after the falling edge of FS and
before the 9th rising edge of SCLK aborts the frame. SDO goes to three-state with CS high and a new frame
is started with the rising edge of FS (see Figure 8 and Figure 9). Previous conversion results are available on
SDO during the new frame.
MSB− D13
D12
D6
MSB−D13
LSB−D0
2
3
8
9
2
3
15
16
Data From Last Conversion
SCLK
FS
BUSY
CS
SDO
(Held Low)
Figure 8. Frame Abort Using FS Before Sample Start


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