Quadrature Modulator

CMX993/CMX993W

 2013 CML Microsystems Plc

2

D/993/10

CONTENTS

Section

Page

1

Brief Description .................................................................................................. 1

1.1

History............................................................................................................. 3

2

Block Diagrams .................................................................................................... 4

3

Signal List ............................................................................................................. 5

3.1

Signal Definitions .......................................................................................... 6

4

External Components .......................................................................................... 7

4.1

Power Supply Decoupling ............................................................................ 7

4.2

Quadrature Modulator ................................................................................... 8

4.3

Local Oscillator Input .................................................................................. 10

5

General Description ........................................................................................... 11

5.1

Quadrature Modulator ................................................................................. 11

5.2

Differential Amplifiers.................................................................................. 11

5.3

Reference Voltages ..................................................................................... 12

5.4

Data Interface ............................................................................................... 12

6

C-BUS Interface and Register Description ...................................................... 13

6.1

General Reset Command: C-BUS address $01 ....................................... 13

6.2

General Control Register: C-BUS address $02 8-bit write-only ............ 14

6.3

Gain Control Register: C-BUS address $05 8-bit write-only ................ 14

6.4

Frequency Control Register: C-BUS address $08 8-bit write-only ....... 15

7

Application Notes............................................................................................... 16

7.1

Typical Performance ................................................................................... 16

7.2

Intermodulation and Modulator Spurious ................................................. 18

8

Performance Specification ................................................................................ 20

8.1

Electrical Performance ................................................................................ 20

8.2

Packaging ..................................................................................................... 26