MAX148 Maxim, MAX148 Datasheet - Page 15

• Manufacturer Part Number: MAX148
• Description: +2.7V to +5.25V / Low-Power / 8-Channel / Serial 10-Bit ADCs
• Manufacturer: Maxim

Figure 11a. External Clock Mode, 15 Clocks/Conversion Timing
Figure 11b. External Clock Mode, 16 Clocks/Conversion Timing
Figure 12a. Timing Diagram Power-Down Modes, External Clock
delay and maximum sample rate. In external compensa-
tion mode, power-up time is 20ms with a 4.7µF compen-
sation capacitor when the capacitor is initially fully
discharged. From fast power-down, start-up time can be
eliminated by using low-leakage capacitors that do not
DOUT
SCLK
DIN
CLOCK
SSTRB
CS
MODE
MODE
DOUT
SCLK
SHDN
DOUT
DIN
DIN
CS
S
1
S X X X X X 1 1
S
1
CONTROL BYTE 0
______________________________________________________________________________________
CONTROL BYTE 0
+2.7V to +5.25V, Low-Power, 8-Channel,
SETS EXTERNAL
CLOCK MODE
10 + 2 DATA BITS
POWERED UP
8
8
B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 S1 S0
B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 S1 S0
EXTERNAL
S
X
CONVERSION RESULT 0
X
X
X
CONVERSION RESULT 0
X
0 0
15
S
1
16
SETS SOFTWARE
POWER-DOWN
10 + 2 DATA BITS
CONTROL BYTE 1
discharge more than 1/2LSB while shut down. In power-
down, leakage currents at VREF cause droop on the ref-
erence bypass capacitor. Figures 12a and 12b show
the various power-down sequences in both external and
internal clock modes.
S
1
CONTROL BYTE 1
POWER-DOWN
SOFTWARE
Serial 10-Bit ADCs
SETS EXTERNAL
CLOCK MODE
8
S
X X X X X
POWERED UP
B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 S1 S0
8
1 1
CONVERSION RESULT 1
VALID
DATA
15
HARDWARE
CONVERSION RESULT 1
EXTERNAL
B9
POWER-
INVALID
DOWN
DATA
S
1
B8
CONTROL BYTE 2
B7
POWERED UP
B6
16
15