MAX149A View Datasheet(PDF) - Maxim Integrated

Part Name

Description

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MAX149A

+2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs

Maxim Integrated 

+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

RLOAD = ∞

1000 CODE = 1010101000

100

8 CHANNELS

10

1 CHANNEL

1

AVERAGE SUPPLY CURRENT

vs. CONVERSION RATE (USING FULLPD)

100

RLOAD = ∞

CODE = 1010101000

8 CHANNELS

10

1 CHANNEL

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

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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