CMX971 Datasheet, PDF (2/25 Pages) CML Microcircuits – Small 16-lead VQFN Package

Quadrature Modulator
CMX971
CONTENTS
Section
Page
1
Brief Description .................................................................................................. 1
1.1 History.............................................................................................................. 3
2
Block Diagram ...................................................................................................... 4
3
Pin and Signal List ............................................................................................... 5
3.1 Main Functions ................................................................................................ 5
3.2 Direct Control Functions .................................................................................. 5
4
External Components .......................................................................................... 6
4.1 Power Supply Decoupling ................................................................................ 6
4.2 Quadrature Modulator...................................................................................... 7
4.3 Local Oscillator (LO) Input ............................................................................... 7
5
General Description ............................................................................................. 8
5.1 Programmable Data Interface ......................................................................... 8
5.2 Quadrature Modulator...................................................................................... 8
5.2.1 DC Offsets and Carrier Leakage............................................................... 8
5.3 Local Oscillator ................................................................................................ 8
6
C-BUS Interface and Register Description ........................................................ 9
6.1 General Reset Command .............................................................................. 10
6.1.1 General Reset Command C-BUS address $1A ...................................... 10
6.2 General Control Register ............................................................................... 11
6.2.1 General Control Register: C-BUS address $1B ...................................... 11
6.2.2 General Control Register C-BUS address $EB....................................... 11
6.3 Control Register ............................................................................................. 11
6.3.1 Control Register: C-BUS address $1E .................................................... 11
6.3.2 Control Register C-BUS address $EE .................................................... 12
7
Direct Control Option......................................................................................... 13
8
Application Notes ............................................................................................... 15
8.1 Impedance Matching Information .................................................................. 15
8.1.1 LO Input................................................................................................... 15
8.2 Modulator Operation ...................................................................................... 15
8.2.1 Quadrature Accuracy .............................................................................. 16
8.2.2 Linearity ................................................................................................... 18
8.2.3 Wideband Noise...................................................................................... 19
8.2.4 Harmonics ............................................................................................... 20
9
Performance Specification ................................................................................ 21
9.1 Electrical Performance................................................................................... 21
9.1.1 Absolute Maximum Ratings .................................................................... 21
9.1.2 Operating Limits ...................................................................................... 21
9.1.3 Operating Characteristics........................................................................ 22
9.2 Packaging ...................................................................................................... 25
 2015 CML Microsystems Plc
2
D/971/4