AD9853_15 datasheet(13/31 Pages) AD

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OBSOLETE

AD9853

–13–

REV. C

DEVICE ADDRESS

A(S)

DATA

A(S)

WRITE

DATA

A(S)

DEVICE ADDRESS

A(S)

READ

DATA

A(M)

DEVICE ADDRESS

A(S)

DATA

A(M)

LSB = 0

LSB = 1

A(S) = ACKNOWLEDGE BY SLAVE

A(M) = ACKNOWLEDGE BY MASTER

S = START CONDITION

P = STOP CONDITION

A(M) = NO ACKNOWLEDGE BY MASTER

Figure 27. Serial Control Bus—Read and Write Sequences

R/W

MSB

LSB

0 = WRITE / 1 = READ

ADDRESS CONTROL

(SET VIA DEVICE PIN 6)

Figure 28. Serial Control Bus—8-Bit Device Address Detail

tFH

tFL

FEC DISABLE/

ENABLE CONTROL

TXENABLE

tFH = FEC TO TXENABLE SETUP TIME = 0ns

tFL = FEC TO TXENABLE HOLD TIME = 0ns

Figure 29. FEC Enable/Disable Timing Diagram

tTR

tRL

TXENABLE

RESET

CONTROL CLOCK

CONTROL DATA

tRH

tPWH

tPWL

tCH

tDS

tDH

tCS

tTR = MINIMUM TXENABLE LOW TO RESET LOW = 10ns

tRL = MINIMUM RESET PULSEWIDTH = 10ns

tRH = MINIMUM RESET TO START CONDITION = 10ns

tCH = MINIMUM CLOCK HOLD TIME START CONDITION = 10ns

tCS = MINIMUM CLOCK SETUP TIME STOP CONDITION = 10ns

tDS = MINIMUM DATA SETUP TIME = 10ns

tDH = MINIMUM DATA HOLD TIME = 10ns

tPWH = tPWL = MINIMUM CLOCK PULSEWIDTH HIGH/LOW = 10ns

tMP = MINIMUM CLOCK PERIOD = 40ns = 25MHz

tMP

Figure 30. Serial Control Interface Timing Diagram

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