MAX148 Datasheet, PDF (16/24 Pages) Maxim Integrated Products – +2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs

+2.7V to +5.25V, Low-Power, 8-Channel,
Serial 10-Bit ADCs
CLOCK
MODE
DIN
DOUT
SETS INTERNAL
CLOCK MODE
SXXXXX10
INTERNAL
SETS
POWER-DOWN
SX X XXX0 0
DATA VALID
SSTRB
MODE
CONVERSION
POWERED UP
CONVERSION
S
DATA VALID
POWER-DOWN
POWERED UP
Figure 12b. Timing Diagram Power-Down Modes, Internal Clock
Table 5. Software Power-Down
and Clock Mode
PD1
PD0
0
0
0
1
1
0
1
1
DEVICE MODE
Full Power-Down
Fast Power-Down
Internal Clock
External Clock
Table 6. Hard-Wired Power-Down
and Internal Clock Frequency
SHDN
STATE
DEVICE
MODE
REFERENCE-
INTERNAL
BUFFER
CLOCK
COMPENSATION FREQUENCY
1
Floating
0
Enabled
Enabled
Power-Down
Internal
External
N/A
225kHz
1.8MHz
N/A
10,000
1000
AVERAGE SUPPLY CURRENT
vs. CONVERSION RATE
WITH EXTERNAL REFERENCE
VREF = V_DD = 3.0V
R_LOAD = ∞
CODE = 1010101000
100
8 CHANNELS
10
1 CHANNEL
1
0.1
0.1 1 10 100 1k 10k 100k 1M
CONVERSION RATE (Hz)
Figure 13. Average Supply Current vs. Conversion Rate with
External Reference
AVERAGE SUPPLY CURRENT
vs. CONVERSION RATE
(USING FULLPD)
100
R_LOAD = ∞
CODE = 1010101000
8 CHANNELS
10
1 CHANNEL
1
0.01 0.1
1
10 100 1k
CONVERSION RATE (Hz)
Figure 14a. MAX149 Supply Current vs. Conversion Rate,
FULLPD
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