ADS7863A Datasheet, PDF (21/42 Pages) Texas Instruments – Dual, 2-MSPS, 12-Bit, 2 + 2 or 3 + 3 Channel, Simultaneous-Sampling, Analog-to-Digital Converter

ADS7863A
www.ti.com
SBAS610 – DECEMBER 2013
Mode IV
In the same way as Mode II, Mode IV uses the SDOA output line exclusively to transmit data while the
differential channels are switched automatically. Following the first conversion after M1 goes high, the SDOB
output 3-states (as shown in Figure 36).
Output data consist of a channel indicator ('0' for CHx0 or '1' for CHx1), followed by the ADC indicator ('0' for
CHAx or '1' for CHBx), 12 bits of conversion results, and end with '00'.
16
16
16
16
16
1
1
1
1
1
1
1
CLOCK
CONVST
Every 2nd
CONVST
Is Ignored
Every 2nd
CONVST
Is Ignored
Every 2nd
CONVST
Is Ignored
SDI
C[1:0] is Ignored
C[1:0] is Ignored
C[1:0] is Ignored
C[1:0] is Ignored
C[1:0] is Ignored
C[1:0] is Ignored
P[1:0] = 00 ® No Features P[1:0] = 00 ® No Features P[1:0] = 00 ® No Features P[1:0] = 00 ® No Features P[1:0] = 00 ® No Features P[1:0] = 00 ® No Features
M0
M1
Both channel 0s are converted first,
followed by conversion of both channel 1s.
RD
CS
CHx
SDOA
Previous 12-Bit
Data CHAx
CHx
SDOB
Previous 12-Bit
Data CHBx
0A
12-Bit
Data CHA0
0B
12-Bit
Data CHB0
1A
12-Bit
Data CHA1
High-Z
1B
12-Bit
Data CHB1
0A
12-Bit
Data CHA0
BUSY
Previous Conversion
of Both CHxx
Conversion
of Both CHx0
No Conversion,
Read Access Only
Conversion
of Both CHx1
No Conversion,
Read Access Only
Conversion
of Both CHx0
0 ms
0.5 ms
1.0 ms
1.5 ms
2.0 ms
2.5 ms
Figure 36. Mode IV Timing Diagram (M0 = 1, M1 = 1)
3.0 ms
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