ADS7863
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SBAS383–JUNE 2007
MODE IV
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 ends with '00'.
In the same way as Mode II, Mode IV uses the
SDOA output line exclusively to transmit data while
the multiplexer channels are switched automatically.
Following the first conversion after M1 goes high, the
SDOB output tri-states (see Figure 19).
16
1
16
1
16
1
16
16
1
1
1
1
CLOCK
Every 2nd
CONVST
Is Ignored
Every 2nd
CONVST
Is Ignored
Every 2nd
CONVST
Is Ignored
CONVST
C[1:0] is Ignored
P[1:0] = '00'
C[1:0] is Ignored
P[1:0] = '11'
SDI Ignored
SDI Ignored
SDI
M0
Both channel 0s are converted first,
followed by conversion of both channel 1s.
M1
RD
CS
CHx
0 A
0 B
1 A
1 B
0 A
Previous 12-Bit
Data CHAx
12-Bit
12-Bit
12-Bit
12-Bit
12-Bit
SDOA
Data CHA0
Data CHB0
Data CHA1
Data CHB1
Data CHA0
CHx
High-Z
Previous 12-Bit
Data CHBx
SDOB
BUSY
Previous Conversion
of Both CHxx
Conversion
No Conversion,
Read Access Only
Conversion
No Conversion,
Read Access Only
Conversion
of Both CHx0
of Both CHx1
of Both CHx0
0ms
0.5ms
1.0ms
1.5ms
2.0ms
2.5ms
3.0ms
Figure 19. Mode IV Timing Diagram (M0 = 1 ; M1 = 1)
17
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