Rainbow-electronics MAX1249 Bedienungsanleitung PDF herunterladen (Seite 15)

POWERED UP

HARDWARE

POWER-

DOWN

POWERED UP

10+2 DATA BITS

INVALID

DATA

VALID

DATA

EXTERNAL

S X

X X X X

1 1 S 0 0

X XXXX X X X X X

S 1 1

SOFTWARE

POWER-DOWN

MODE

DOUT

DIN

CLOCK

MODE

SHDN

SETS EXTERNAL

CLOCK MODE

SETS EXTERNAL

CLOCK MODE

SETS SOFTWARE

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 11a. Timing Diagram Power-Down Modes, External Clock

Figure 11b. Timing Diagram Power-Down Modes, Internal Clock

MAX1248/MAX1249

+2.7V to +5.25V, Low-Power, 4-Channel,

Serial 10-Bit ADCs in QSOP-16

______________________________________________________________________________________ 15

REFERENCE

BUFFER

REFERENCE-BUFFER

COMPENSATION

MODE

VREF

CAPACITOR

(µF)

POWER-DOWN

MODE

POWER-UP

DELAY

(µs)

MAXIMUM

SAMPLING RATE

(ksps)

Disabled — — Full 2 133

Enabled Internal — Fast 5 26

Enabled Internal — Full 300 26

Enabled External 4.7 Fast See Figure 13c 133

Enabled External 4.7 Full See Figure 13c 133

Disabled — — Fast 2 133

Table 4. Typical Power-Up Delay Times

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 23 24

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