MAX148_V5 Datasheet, PDF (16/23 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
SSTRB
MODE
SETS INTERNAL
CLOCK MODE
SXXXXX10
CONVERSION
DATA VALID
POWERED OFF
INTERNAL
SETS
POWER-DOWN
5XXXXX00
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
1
DEVICE
MODE
Enabled
REFERENCE
BUFFER
COMPENSATION
Internal
INTERNAL
CLOCK
FREQUENCY
225kHz
Unconnected Enabled
External
1.8MHz
0
Power-
Down
—
—
AVERAGE SUPPLY CURRENT vs. CONVERSION
RATE WITH EXTERNAL REFERENCE
10,000
VREF = VDD = 3.0V
R_LOAD = ∞
1000 _{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
16  
AVERAGE SUPPLY CURRENT
vs. CONVERSION RATE (USING FULLPD)
100
RLOAD = ∞
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