Datasheet

+2.7V to +5.25V, Low-Power, 8-Channel,
Serial 10-Bit ADCs
MAX148/MAX149
16
Figure 12b. Timing Diagram Power-Down Modes, Internal Clock
Table 5. Software Power-Down and Clock
Mode
Table 6. Hard-Wired Power-Down and
Internal Clock Frequency
Figure 13. Average Supply Current vs. Conversion Rate with
External Reference
Figure 14a. MAX149 Supply Current vs. Conversion Rate,
FULLPD
INTERNAL
DATA VALID
CONVERSION
SETS INTERNAL
CLOCK MODE
SETS
POWER-DOWN
DATA VALID
CONVERSION
POWERED UP
CLOCK
MODE
DIN
DOUT
SSTRB
MODE
POWER-DOWN
POWERED OFF
S X X X X X 1 0
5 X X X X X 0 0
S
PD1 PD0 DEVICE MODE
0 0 Full Power-Down
0 1 Fast Power-Down
1 0 Internal Clock
1 1 External Clock
SHDN
STATE
DEVICE
MODE
REFERENCE
BUFFER
COMPENSATION
INTERNAL
CLOCK
FREQUENCY
1 Enabled Internal 225kHz
Unconnected Enabled External 1.8MHz
0
Power-
Down
— —
AVERAGE SUPPLY CURRENT vs. CONVERSION
RATE WITH EXTERNAL REFERENCE
MAX148/9-F13
CONVERSION RATE (Hz)
AVERAGE SUPPLY CURRENT (µA)
100k10k1k100101
1
10
100
1000
10,000
0.1
0.1 1M
V
REF
= V
DD
= 3.0V
R
LOAD
= ∞
CODE = 1010101000
8 CHANNELS
1 CHANNEL
AVERAGE SUPPLY CURRENT
vs. CONVERSION RATE (USING FULLPD)
MAX148/9-F14A
CONVERSION RATE (Hz)
AVERAGE SUPPLY CURRENT (µA)
0.1 1 10 100
10
100
1
0.01 1k
R
LOAD
= ∞
CODE = 1010101000
8 CHANNELS
1 CHANNEL