AD9985ASLASHPCB datasheet(27/32 Pages) AD

27 / 32 page

AD9985A

Rev. 0 | Page 27 of 32

Serial Interface Read/Write Examples

Write to one control register:

Start signal

Slave address byte (R/W Bit = low)

Base address byte

Data byte to base address

Stop signal

Write to four consecutive control registers:

Start signal

Slave address byte (R/W bit = low)

Base address byte

Data byte to base address

Data byte to (base address + 1)

Data byte to (base address + 2)

Data byte to (base address + 3)

Stop signal

Read from one control register:

Start signal

Slave address byte (R/W bit = low)

Base address byte

Start signal

Slave address byte (R/W bit = high)

Data byte from base address

Stop signal

Read from four consecutive control registers:

Start signal

Slave address byte (R/W bit = low)

Base address byte

Start signal

Slave address byte (R/W Bit = high)

Data byte from base address

Data byte from (base address + 1)

Data byte from (base Address + 2)

Data byte from (base Address + 3)

10. Stop signal

BIT 7

ACK

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

SDA

SCL

Figure 13. Serial Interface—Typical Byte Transfer

SYNC STRIPPER

ACTIVITY

DETECT

NEGATIVE PEAK

CLAMP

COMP

SYNC

SOG

HSYNC IN

ACTIVITY

DETECT

MUX 2

HSYNC OUT

PIXEL CLOCK

MUX 1

SYNC SEPARATOR

INTEGRATOR

VSYNC

SOG OUT

HSYNC OUT

VSYNC OUT

MUX 4

VSYNC IN

1/S

PLL

HSYNC

ACTIVITY

DETECT

AD9985A

CLOCK

GENERATOR

POLARITY

DETECT

POLARITY

DETECT

POLARITY

DETECT

MUX 3

COAST

Figure 14. Sync Processing Block Diagram

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