Rainbow Electronics MAX1243 - Manual (Page 9)

MAX1242/MAX1243
+2.7V to +5.25V, Low-Power, 10-Bit
Serial ADCs in SO-8
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EOC
INTERFACE IDLE
CONVERSION
IN PROGRESS
EOC
0 µ s
TRAILING
ZEROS
SUB
BITS
IDLE CLOCK OUT SERIAL DATA
TRACK/HOLD
STATE
TRACK HOLD TRACK
DOUT B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 S1 S0
SCLK
1 4 8 12 16
7.5 µ s (t CONV )
HOLD
0 µ s
(t CS )
TOTAL = 13.7 µ s
12.5 × 0.476 µ s = 5.95 µ s
CYCLE TIME
CS
0.24 µ s
Figure 8a. Interface Timing Sequence
EOC
INTERFACE IDLE
CONVERSION
IN PROGRESS
EOC
0 µ s
IDLE CLOCK OUT SERIAL DATA
TRACK/HOLD
STATE
TRACK HOLD TRACK
DOUT B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
SCLK
1 4 8
7.5 µ s (t CONV )
HOLD
(t CS )
TOTAL = 12.74 µ s
10.5 × 0.476 µ s = 5 µ s
CYCLE TIME
CS
0.24 µ s
Figure 8b. Interface Timing Sequence—Minimum Cycle Time
…
…
…
…
CS
SCLK
DOUT
INTERNAL
T/H
(TRACK/ACQUIRE)
t CS0
t
CONV t DV
t STR
t
AP
(HOLD) (TRACK/ACQUIRE)
B0 S1 S0
t
CH
t DO
t CL t TR
t CS
Figure 9. Detailed Serial-Interface Timing