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AD1970

Digital BTSC Encoder with Integrated ADC and DAC

Analog Devices 

AD1970

TABLE OF CONTENTS

Specifications..................................................................................... 3

Absolute Maximum Ratings............................................................ 6

Package Characteristics (48-Lead LQFP).................................. 6

ESD Caution.................................................................................. 6

Pin Configuration and Function Descriptions............................. 7

Theory of Operation ........................................................................ 9

Signal Processing ............................................................................ 10

Background of BTSC ................................................................. 10

Performance Factors .................................................................. 10

Separation Alignment ................................................................ 11

Phase Linearity of the External Analog Filter......................... 11

Input Levels ................................................................................. 11

Clocking and PLL....................................................................... 11

Crystal Oscillator........................................................................ 11

General Purpose Input/Output (GPIO) Pins ......................... 11

REVISION HISTORY

4/05—Revision 0: Initial Version

Power-Up Sequence ................................................................... 11

Control Port .................................................................................... 12

I2C Port Overview ...................................................................... 12

I2C Address Decoding................................................................ 12

Input Level Control.................................................................... 13

Output Level Control................................................................. 13

I2C Read/Write Data Formats................................................... 14

Analog Input/Output ..................................................................... 16

ADC Input................................................................................... 16

DAC Output................................................................................ 16

Serial Data Port........................................................................... 16

Serial Data Modes ...................................................................... 16

Typical Applications Circuit.......................................................... 18

Outline Dimensions ....................................................................... 19

Ordering Guide .......................................................................... 19

Rev. 0 | Page 2 of 20

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