Rainbow-electronics MAX149 Manual do Utilizador descarregar pdf (Página 16)

MAX148/MAX149

+2.7V to +5.25V, Low-Power, 8-Channel,

Serial 10-Bit ADCs

16 ______________________________________________________________________________________

Table 6. Hard-Wired Power-Down

and Internal Clock Frequency

PD1 PD0 DEVICE MODE

0 0 Full Power-Down

0 1 Fast Power-Down

1 0 Internal Clock

1 1 External Clock

Table 5. Software Power-Down

and Clock Mode

Figure 13. Average Supply Current vs. Conversion Rate with

External Reference

1000

10,000

0.1

AVERAGE SUPPLY CURRENT

vs. CONVERSION RATE

WITH EXTERNAL REFERENCE

100

CONVERSION RATE (Hz)

AVERAGE SUPPLY CURRENT (µA)

1 10010 1k 10k 1M100k

MAX148/9-13

VREF = V

= 3.0V

LOAD

= ∞

CODE = 1010101000

1 CHANNEL

8 CHANNELS

Figure 14a. MAX149 Supply Current vs. Conversion Rate,

FULLPD

100

0.01 0.1 1

AVERAGE SUPPLY CURRENT

vs. CONVERSION RATE

(USING FULLPD)

CONVERSION RATE

(Hz)

AVERAGE SUPPLY CURRENT (µA)

10010 1k

MAX148/9-F14A

LOAD

= ∞

CODE = 1010101000

8 CHANNELS

1 CHANNEL

POWER-DOWN

POWERED UP

DATA VALID

INTERNAL

S X

X X X X

1 0 S 0 0

X XXXX

MODE

DOUT

DIN

CLOCK

MODE

SETS INTERNAL

CLOCK MODE

SETS

POWER-DOWN

CONVERSION

SSTRB

Figure 12b. Timing Diagram Power-Down Modes, Internal Clock

N/AN/APower-Down0

1.8MHzExternalEnabledFloating

225kHzInternalEnabled1

INTERNAL

CLOCK

FREQUENCY

REFERENCE-

BUFFER

COMPENSATION

DEVICE

MODE

SHDN

STATE

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 22 23 24

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