CMX971 Datasheet, PDF (3/25 Pages) CML Microcircuits – Small 16-lead VQFN Package

Quadrature Modulator
CMX971
Section
Page
Table 1 Main Pin Functions ................................................................................................ 5
Table 2 Direct Control Pin Functions.................................................................................. 5
Table 3 Power Supply Component Values......................................................................... 6
Table 4 Quadrature Modulator Output Components .......................................................... 7
Table 5 Typical Wideband Noise at 5MHz Offset with Different Frequency Control Settings
.......................................................................................................................................... 19
Table 6 Typical Modulator Harmonic Levels for Given Output Frequency....................... 20
Section
Page
Figure 1 Block Diagram ...................................................................................................... 4
Figure 2 Power Supply Connections and Decoupling ........................................................ 6
Figure 3 Modulator Output External Components (30MHz to 1GHz)................................. 7
Figure 4 LO Input Configuration ......................................................................................... 7
Figure 5 C-BUS Transactions .......................................................................................... 10
Figure 6 LO Impedance.................................................................................................... 15
Figure 7 Typical Variation in Modulator Output Level with Frequency ............................. 16
Figure 8 Modulator Accuracy with Frequency .................................................................. 17
Figure 9 Typical Spectrum with APCO C4FM, (TIA/EIA 102.CAAB-B) at 500MHz ......... 17
Figure 10 Linearity at 500 MHz, 1Vp-p and 0.5Vp-p Differential Input Levels.................. 18
Figure 11 Linearity Measured as Output Third Order Intercept Point (OIP3) Variation with
Frequency.......................................................................................................................... 19
Figure 12 C-BUS Timing .................................................................................................. 24
Figure 13 Q7 Mechanical Outline: Order as part no. CMX971Q7................................... 25
1.1 History
Version
4
3
2
1
Changes

 Added Smith Chart for LO input impedance, as section 8.1.1
 Information added on modulator harmonics (section 8.2.4).
 Clarification of Front Page, sections 5.2 and 7.0.
 Additional information on FREQ bit settings, section 5.2.1
 Updated parametric information, after further characterisation
 First Issue
Date
17/2/15
25/2/13
17/5/12
23/3/12
 2015 CML Microsystems Plc
3
D/971/4