AD9879BS View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD9879BS

Mixed-Signal Front End Set-Top Box, Cable Modem

Analog Devices 

AD9879

TABLE OF CONTENTS

Specifications..................................................................................... 4

Absolute Maximum Ratings............................................................ 7

Explanation of Test Levels ........................................................... 7

Thermal Characteristics .............................................................. 7

ESD Caution.................................................................................. 7

Pin Configuration and Function Descriptions............................. 8

Terminology .................................................................................... 10

Theory of Operation ...................................................................... 11

Transmit Path.............................................................................. 11

Data Assembler........................................................................... 11

Interpolation Filter ..................................................................... 12

Digital Upconverter.................................................................... 12

DPLL-A Clock Distribution...................................................... 12

Clock and Oscillator Circuitry ................................................. 12

Programmable Clock Output REFCLK................................... 13

Reset and Transmit Power-Down ............................................ 14

Σ-Δ Outputs ................................................................................ 15

Register Map and Bit Definitions ................................................. 16

Register 0x00—Initialization .................................................... 17

Register 0x01—Clock Configuration....................................... 17

Register 0x02—Power-Down.................................................... 17

Registers 0x03–0x04—Σ-Δ and Flag Control......................... 17

Register 0x07—Video Input Configuration............................ 17

Register 0x08—ADC Clock Configuration ............................ 18

Register 0x0C—Die Revision.................................................... 18

Register 0x0D—Tx Frequency Tuning Words LSBs.............. 18

Register 0x0E—DAC Gain Control ......................................... 18

Register 0x0F—Tx Path Configuration ................................... 18

Registers 0x10–0x17—Carrier Frequency Tuning................. 19

Serial Interface for Register Control ............................................ 20

General Operation of the Serial Interface............................... 20

Instruction Byte .......................................................................... 20

Serial Interface Port Pin Description....................................... 20

MSB/LSB Transfers .................................................................... 20

Notes on Serial Port Operation ................................................ 21

Transmit Path (Tx) ......................................................................... 22

Transmit Timing......................................................................... 22

Data Assembler........................................................................... 22

Half-Band Filters (HBFs) .......................................................... 22

Cascaded Integrator-Comb (CIC) Filter................................. 22

Combined Filter Response........................................................ 22

Tx Signal Level Considerations ................................................ 24

Tx Throughput and Latency ..................................................... 24

Digital-to-Analog Converter .................................................... 25

Programming the AD8321/AD8323 or AD8322/AD8327 Cable

Driver Amplifier Gain Control..................................................... 26

Receive Path (Rx) ........................................................................... 27

IF10 and IF12 ADC Operation ................................................ 27

Input Signal Range and Digital Output Codes....................... 27

Driving the Inputs ...................................................................... 27

PCB Design Considerations.......................................................... 28

Component Placement .............................................................. 28

Power Planes and Decoupling .................................................. 28

Ground Planes ............................................................................ 29

Signal Routing............................................................................. 29

Outline Dimensions ....................................................................... 30

Ordering Guide .......................................................................... 30

Rev. A | Page 2 of 32

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