TUA6039 Infineon Technologies Corporation, TUA6039 Datasheet - Page 22

• Manufacturer Part Number: TUA6039
• Description: Stationary - Mopll & Silicon Tuner
• Manufacturer: Infineon Technologies Corporation

loop filter and its post filter configuration. The measurement result is based on TUA6039-2 C1 typical
sample
configured according to following component values:
DVB-T:
ATSC:
Hybrid:
The above test result shows that the rejection ratio for reference frequency of 62.5kHz is
dependant of the loop filter and post filter configuration. This application note covers only DVB-T
reception with reference frequency of 166.67kHz. Although Loop filter can be modified to cover
both 166.67kHz and 62.5kHz for hybrid purposes, there is always compromise among Phase
Noise, Reference Frequency Rejection and PLL Lock-in Time. It is strongly recommended that
designers decide the reference frequency first (62.5kHz or 166.67kHz or both) before adopting the
relevant loop filter and post filter configuration.
-61
-66
-71
-76
The following graph shows the 62.5kHz reference frequency rejection ratio based on different
Referring to the schematic diagram of the reference mini half nim with TUA6039-2, the loop filter and its post filter is
Main Loop Filter Config:
Post Filter Config:
Main Loop Filter Config:
Post Filter Config:
Main Loop Filter Config:
Post Filter Config:
Application Notes Revision 3.0
DVB-T
ATSC
Hybrid
Ref Spur (62.5kHz) Rejection
C68 = 6.8nF
C65 = 33pF
R39 = 150kOhm
R40 = 33kOhm
R45 = 2.2kOhm
C41 = 3.3nF
C24 = 15nF
C68 = 47nF
C65 = 470pF
R39 = 100kOhm
R40 = 330kOhm
R45 = 15kOhm
C41 = 6.8nF
C24 = 22nF
C68 = 6.8nF
C65 = 33pF
R39 = 100kOhm
R40 = 150kOhm
R45 = 2.2kOhm
C41 = 3.3nF
C24 = 15nF
Application Engineering
Frequency (MHz)
21
Communication Solutions
IFAP COM Tuner Systems
May 2007