ST TDA911 Series, Application Note, Page: 2 / 62

Obsolete Product(s) - Obsolete Product(s)
AN1290
2/62 STMicroelectronics Confidential
Table of Contents
Chapter 1 Main Characteristics of the TDA9112 Deflection Processor Family . . . . . . . . .5
Chapter 2 Special Features of the TDA9112A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Chapter 3 TDA9112 Family Pin Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Chapter 4 Horizontal Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
4.1 Theory of Operation ........................................................................................................... 11
4.1.1 Horizontal Section Structure ..............................................................................................................11
4.1.2 Digital Sync Detection ........................................................................................................................12
4.1.3 Composite Sync .................................................................................................................................12
4.1.4 Voltage-controlled Oscillator ..............................................................................................................12
4.1.5 PLL1 ..................................................................................................................................................13
4.1.6 Free-running Frequency and Range ..................................................................................................13
4.1.7 Frequency Precision ..........................................................................................................................14
4.1.8 PLL1 Inhibition ...................................................................................................................................15
4.1.9 Frequency Change Speed Limitation .................................................................................................16
4.1.10 PLL2, Duty Factor, ON/OFF ...............................................................................................................16
4.1.11 Soft-start ............................................................................................................................................17
4.1.12 Output Stage ......................................................................................................................................17
4.1.13 X-ray Protection .................................................................................................................................17
4.1.14 Lock-Unlock Detection .......................................................................................................................17
4.1.15 H Moire Cancellation .........................................................................................................................18
4.2 Application Hints ................................................................................................................ 19
4.2.1 Minimizing Jitter .................................................................................................................................19
4.2.2 Output Stage ......................................................................................................................................20
4.2.3 Enlarging the Frequency Range ........................................................................................................21
4.2.4 X-Ray Protection ................................................................................................................................22
Chapter 5 Vertical Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
5.1 Theory of Operation ........................................................................................................... 23
5.1.1 Structure of V Section ........................................................................................................................23
5.1.2 Ramp Generator and AGC Loop .......................................................................................................23
5.1.3 Frequency Range and Precision ........................................................................................................24
5.1.4 Sync Detection ...................................................................................................................................25
5.1.5 AGC Loop Stability .............................................................................................................................26
5.1.6 S and C Correction (TDA9112 to TDA9116) ......................................................................................26
5.1.7 Output Stage and Vertical Shift ..........................................................................................................28
5.1.8 Vertical Signal Management in the TDA9112A ..................................................................................29
5.1.9 ON/OFF Function ..............................................................................................................................30
5.1.10 V Lock/Unlock ....................................................................................................................................30
5.1.11 V Moire ..............................................................................................................................................31
5.1.12 Vertical Breathing Function (EHT Compensation) .............................................................................31
5.1.13 Implementing the Breathing Function ................................................................................................31