Data Sheet

AD8372

Rev. C | Page 5 of 16

SERIAL CONTROL INTERFACE TIMING

DON'T CARE

WRITE BIT

LSB

LSB + 1

LSB + 2

MSB – 2

MSB – 1

MSB

NOTES

1. THE FIRST SDI BIT DETERMINES WHETHER THE PART IS WRITING TO OR READING FROM THE INTERNAL GAIN WORD REGISTER. FOR A

WRITE OPERATION, THE FIRST BIT SHOULD BE A LOGIC 1. THE GAIN WORD BIT IS THEN REGISTERED INTO THE SDI PIN ON CONSECUTIVE

RISING EDGES OF THE CLOCK.

CLK1 OR CLK2

LCH1 OR LCH2

SDI1 OR SDI2

Figure 2. Write Mode Timing Diagram

DC

DC

READ BIT

DC

DC

DC

DC

DC

LSB

LSB + 1

LSB + 2

MSB – 2

MSB – 1

MSB

CLK1 OR CLK2

LCH1 OR LCH2

SDI1 OR SDI2

SDO1 OR SDO2

NOTES

1. THE FIRST SDI BIT DETERMINES WHETHER THE PART IS WRITING TO OR READING FROM THE INTERNAL GAIN WORD REGISTER. FOR A

READ OPERATION, THE FIRST BIT SHOULD BE A LOGIC 0. THE GAIN WORD BIT IS THEN UPDATED AT THE SDO PIN ON CONSECUTIVE

FALLING EDGES OF THE CLOCK.

Figure 3. Read Mode Timing Diagram

Table 3. Serial Programming Timing Parameters

Parameter

Min

Unit

10

ns

20

ns

Write Mode

0.0

ns

1.6

ns

−1.8

ns

2.0

ns

Read Mode

4.5

ns