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176 F2PIP / Second Tuner Second (PIP) Tuner The second tuner contained in the MM101 is used exclusively for PIP tuning functions. With one exception noted below, when broadcast programming is the source of both signals, the PIP and Main video is "swapped". The PIP tuner signal will only appear in the PIP window and main tuner signal will always be the main video. The two tuners are retuned to the required channels during the swap. When the same channel is displayed in PIP as is displayed in the Main display, the PIP window receives its signal from the Main tuner/IF. Further, the PIP tuner local oscillator (LO) is tuned to a frequency different from the normal range. This assures local oscillators from both tuners cannot concurrently add and complies with FCC Local Field Radiation requirements. The second tuner is identical to the CTC197 main tuner in topography and electrical operation. See the CTC195/197 Technical Training Manual (T-CTC195/197-1) for further information.
RF to Main Tuner ANT Main/PIP Splitter UHF Single Tuned UHF/VHF Splitter VHF VHF Single Tuned RF Amp Double Tuned PRI/SEC 4 2 VHF Hi VHF Lo 9 VHF TANK CR17702 CR17703 RF IN UHF RF Amp Double Tuned PRI/SEC 12
UHF Hi UHF 10 Lo
U17301 VHF/UHF Mixer/Osc
14
16
UHF TANK CR17301 CR17304
11
7 6 ST 10 L01 7 8 BV/U PRI SEC 14
IF OUT 1
U17401 PLL
C RUN 2 D 3 4 18 19 C D
Q17402
BS1/2 17 LO2 Loop Filter 5 11 +12Vr IF to Saw Filter
U13203 BUS MULTIPLEXER
Figure 12-1, Second Tuner Block Diagram
F2PIP / Second Tuner 177
+12Vrt R27921 2400 +12Vrt R27920 1000 Q27902 Second Tuner IF from U17301-1 PIP RF AGC Q27908
PIP Video to U16501-28 PIP Video Active: On PIP Video Disabled: Off R27938 8200 Q27905
+5Vrt 4.5 MHz Trap
U27901 PIP IF
Q27906 2nd Tuner Sync
U27903 Second Tuner EEPROM
C 6 C D 5 C
AGC Delay 25
VCO 19
AFT 10 Out
2 3
2nd Tuner AFT R27938 1000
U27904 AMP
9 11
U13101 Syscon
5
4
U27902 PIP DAC
PIP Video Active: Hi 15 PIP Video Disabled: Lo PIP Video Switch
U13203 D 14 Multiplexer
3
D
Figure 12-2, Second Tuner IF Block Diagram Second Tuner IF The second tuner IF has been modified from the CTC197. A PIP DAC controls the PIP IF IC, U27901 and PIP tuner and IF alignments are stored in an EEPROM dedicated to the second tuner operation.
178 F2PIP / Second Tuner
Q18101 Main_CV From Vid Switch U16501-15/16 Buffers PIP_CV Q16502 1
PIP Analog Switch Y
C
51
Main Analog Switch
Comb Filter
10Bit D/A
47
Comb_C To Video Switch U16500-11/20 Comb_Y
Y 8Bit D/A
49
8Bit A/D
C
From Video Switch U16500-15/16/17/18
Y1 C1 Y2 C2
7 11 3 5
8Bit A/D
Y Video C Switch Y C
PIP OverLay Switch C Y
39 41
Main_C Main_Y
To Video Processer U22300-13/15
35
PIP Process 8Bit D/A PIP_Y 8Bit D/A
To ys Ctl Clk 13101 Data pin 3/4
28 Q18103 27
C Bus Decoder
2
33
Q18109 PIP Luma
Buffer 26 +12V Q18104 Buffer
37
U18100
FPIP Switch
V Sync FB Pulse
PIP_C
31
Q18110 PIP Chroma
24
Buffers Q18112/113
Figure 12-3, F2PIP Switching
F2PIP Overview The F2PIP IC provides Pix-in-Pix functions for the MM101. The F2PIP contains analog switches necessary to perform the swap and overlay functions. All A/D's (Analog-to-Digital converters), D/A's (Digital-to-Analog Converters) and digital circuits necessary to process and control the small overlay picture are contained within the F2PIP IC. The F2PIP IC, U18100 is designed to be a 1-chip solution for most picture-in-picture functions. In addition, it provides a digital comb filter for the main picture Y/C separation. The F2PIP contains analog switches to select between two composite or two component (S-Video) sources. Any combination (two of the four possible inputs) can be selected for the main picture or the PIP picture. The design of the F2PIP IC is intended to keep external components to a minimum. All inputs are designed to accept industry standard 1 volt (p-p) video sources, and all outputs are designed to provide the same standard 1 volt outputs.
F2PIP / Second Tuner 179 The larger on-screen picture is referred to as the "main" picture and the small window is referred to as the "PIP" picture. The main tuner is always responsible for the main picture, while the PIP tuner always provides signal for the PIP window. The exception is when a video source input is selected as the main or PIP picture. When looking at the tuner outputs, if the two pictures are swapped, the main tuner will retune to the PIP channel for the large screen (main) and the PIP tuner will retune to the previous large screen channel selection and display it in the PIP window. The exception, as previously noted is when the PIP and Main window are tuned to the same channel.
The following screens show the relative position of the PIP window, information display and menu and their appearance with a video background. Note the PIP window may be moved around the perimeter of the screen on some models. The menu and information display are fixed.
5:30PM
CC
3
PIP Window
Information Display
MAIN MENU 1 2 3 4 5 6 7 Audio ... Picture Quality ... Screen ... Channel ... Time ... Parental Controls ... Setup ...
0 Go Back
Menu Figure 12-4, Various On-Screen Display Modes
180 F2PIP / Second Tuner F2PIP IC The F2PIP is divided into several sections; the PIP processor, comb filter, analog video switching, PIP overlay switching and IIC bus decoder sections. Both the main and PIP pictures are first converted to digital signals for processing. The main picture is applied to a comb filter. The digitized PIP picture is applied to the PIP processing section within U18100. After comb filtering and PIP processing, both signals are converted back to analog where they are applied to the main video switch (which is also analog) and the PIP overlay switch (analog). F2PIP Communications The IIC bus section controls F2PIP functionality. Registers holding control information are distributed throughout the IC. The F2PIP IC must receive and transmit status data, however it operates on a 3.3V supply. The MM101 uses 5V IIC bus lines. To provide the necessary logic level shift, bi-directional buffer transistors Q18103 and Q18104 are used. F2PIP Signal Switching The F2PIP IC provides all control for PIP operation. The main and PIP composite video signals from switching IC, U16501-15/16, are input to pins 1 and 51 of U18100. The two S-Video inputs are applied directly to U18100 at pins 3 & 5 and 7 & 11. Internal to the IC, the S-Video luma and chroma signals are combined to form a third and fourth composite signal. These four composite video input signals are applied to two analog switch circuits within the IC. One is the "Main" picture analog switch and the other is the "PIP" picture analog switch. The outputs of both analog switches are applied to 8 bit A/D (analog-to-digital) converters. The two uncombined S-Video inputs are both applied to an S-Video switch. The output of the analog switch processing (the "main" signal) is applied to an A/D converter producing an 8 bit digital representation of the composite signal. From here, the digital comb filter separates luma and chroma information. After main picture digital video is separated by the comb filter, the digital luma and chroma signals are converted back to analog signals by an 8 bit (luma) and a 10 bit (chroma) D/A converter. The luma and chroma signals then exits the IC at pin 49 and 47 where they are applied to the S-Video switch IC U16500 at pins 11 & 20. The output of the PIP analog switch (within U18100) is also digitized and applied to a PIP processing circuit that separates luma and chroma. The separate PIP luma and chroma signals are both converted back to analog via two D/A converters. The analog PIP luma signal then exits the IC at pin 33, is buffered and reenters at pin 35. PIP luma is then applied to the "Over-Lay" switch. The PIP chroma signal exits at pin 31, is buffered and reenters at pin 37. The PIP chroma signal is also applied to the overlay switch. Remember, the output of the Main Analog switch is processed by the digital comb filter and always serves as the main picture except when S-Video is selected as the main picture by the S-Video switch.
F2PIP / Second Tuner 181
Q18101 Main_CV From Vid Switch U16501-15/16 Buffers PIP_CV Q16502 1
PIP Analog Switch Y
C
51
Main Analog Switch
Comb Filter
10Bit D/A
47
Comb_C To Video Switch U16500-11/20 Comb_Y
Y 8Bit D/A
49
8Bit A/D
C
From Video Switch U16500-15/16/17/18
Y1 C1 Y2 C2
7 11 3 5
8Bit A/D
Y Video C Switch Y C
PIP OverLay Switch C Y
39 41
Main_C Main_Y
To Video Processer U22300-13/15
35
PIP Process 8Bit D/A PIP_Y 8Bit D/A
To ys Ctl Clk 13101 Data pin 3/4
28 Q18103 27
C Bus Decoder
2
33
Q18109 PIP Luma
Buffer 26 +12V Q18104 Buffer
37
U18100
FPIP Switch
V Sync FB Pulse
PIP_C
31
Q18110 PIP Chroma
24
Buffers Q18112/113
Figure 12-5, F2PIP IC Processing
The function of the S-Video switch is to select between the output from the Main Analog switch and the S-Video input at pins 3 and 5. The output of the S-Video switch always serves as the Main picture video and is applied to the Overlay Switch. The PIP picture Y/C signals are also applied to the Overlay switch. The Overlay switch combines the analog luma and chroma (Y/C) signals of both the main pix and the PIP pix with the PIP signal overlaid on top of the main picture. This signal is then output at pins 39 and 41 where they are sent to the Video Processor , U22300, pins 13 and 15 for further processing. The F2PIP Switch, U18100, is controlled via the IIC bus. However, the data line from the microcomputer to IC U18100 is a two-way data communications line. The data going to the IC (function and control information) is buffered by Q18103 and input into pin 27. The data coming out of the IC (status information) exits the IC at pin 26 and is buffered by Q18142 before its sent back to the System Control Microcomputer U13101. The IIC bus decoder in U18100 is responsible for controlling all the switching circuits inside the F2PIP IC according to instructions from system control. For internal synchronization and switching purposes, a vertical sync signal and a horizontal signal are combined and input at pin 24 of the IC.
182 F2PIP / Second Tuner PIP IC U18100 Pinout The following pages contain a complete pin out diagram of the F2PIP IC and descriptions of all pin functions.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
CV 2 TEST 6 SV1 Y TEST 0 SV1 C VDD AN SV2 Y VSS AN COMB AD T COMB AD M SV2 C COMB AD B COMB AD N VDD AD VSS AD P IP AD T PIP AD B ANA BIAS
U18100 FPIP IC
IIC D IN IIC C VSS DIG TEST 7 PIP C VDD SRAM PIP Y TEST 5 PIP YI PIP C ADJ PIP CI PIP Y ADJ C OUT VDD DA Y OUT VSS DA COMB YI COMB ADJ COMB CI TEST 4 COMB CO TEST 3 COMB YO TEST 2 CV 1 TEST1
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52
ANALOOP FIL OSC IN OSC OUT VDD DIG POR MAIN COMP SYNC GTE IIC DOUT
FPIP Power Supply 3 +5Vr U18101 1 2 +3.3Vr
Figure 12-6, F2PIP IC Pinout
F2PIP / Second Tuner 183 1. CV 2 One of the four Composite Video inputs available as a source for either the Main Picture or the PIP Picture. Only two are available from outside the IC.
2. 3. 4. 5.
TEST 6 (Manufacturing Use Only) SV1 Y One of the two S-Video Luminance inputs available as a source of Luminance for either the Main Picture or the PIP Picture TEST 0 (Manufacturing Use Only) SV1 C One of two S-Video Chrominance inputs available as a source of Chroma for either the Main Picture or the PIP Picture. The S-Video Luma and Chroma signals are combined inside the F2PIP IC and routed to the internal composite video switches. VDD ANSupply voltage, all analog blocks (except A/Ds D/As and VCXO)
6. 7.
SV2 Y One of two S-Video Luma inputs available as a source of luma for either the Main Picture or the PIP Picture. S-Video Luma and Chroma signals are combined inside the F2PIP IC and routed to the internal composite video switches. VSS AN Ground reference for pin 6, analog
8. 9. 10. 11.
COMB AD T Bypass capacitor for Main Picture A/D. COMB AD N Bypass capacitor for Main Picture A/D. SV2 C One of the two S-Video Chrominance inputs available as a source of Chrominance for either the Main Picture or the PIP Picture
12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24.
COMB AD B Bypass capacitor input for Main Picture A/D. COMB AD N Bypass capacitor input for Main Picture A/D. VDD AD VSS AD PIP AD T PIP AD B ANA BIAS ANA FIL OSC IN OSC OUT VDD DIG POR Supply voltage, analog (A/Ds and OSC) Ground reference for pin 14, analog VDD Bypass capacitor input for PIP A/D. Bypass capacitor input for PIP A/D. Clock Generator Bias Clock Generator Bias Filter Timing Crystal Input Timing Crystal Output Supply voltage, digital Power-On Reset (active low)
MAIN COMP SYNC Composite Sync Input
184 F2PIP / Second Tuner 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. 43. 44. 45. 46. 47. 48. 49. 50. 51. GTE IIC DOut IIC DIn IIC C VSS DIG TEST 7 PIP C Global Test Enable (Not used) I2C bus data output I2C bus data input I2C bus clock Ground reference, digital (Manufacturing Use Only) PIP (Small) Picture Chrominance Output
VDD SRAM Supply voltage, digital PIP Y TEST5 PIP YI PIP C ADJ PIP CI PIP Y ADJ C OUT VDD DA Y OUT VSS DA COMB YI PIP (small) Picture Luminance Output (Manufacturing Use Only) Overlay switch (PIP) Luma input Bypass capacitor for PIP Chroma D/A Adjust Overlay switch (PIP) Chroma input Bypass capacitor for PIP Luma D/A Adjust Main Pix Chroma Output with PIP Chroma overlay Supply voltage, analog (D/As and Sub-D/As) Main Pix Luma Output with PIP Luma overlay Ground reference for pin 40, analog VDD S-Video Luma input
COMB ADJ Bypass capacitor for Comb D/A Adjust. There is one adjustment D/A for two Comb output D/A's. COMB CI TEST 4 COMB CO TEST 3 COMB YO TEST 2 CV 1 S-Video Chroma input (Manufacturing Use Only) Digital Line Comb Filter Main Picture Chrominance Output (Manufacturing Use Only) Digital Line Comb Filter Main Picture Luminance Output (Manufacturing Use Only) One of the four Composite Video inputs available as a source for either the Main Picture or the PIP Picture. Only two of the inputs are available from outside the IC. (Manufacturing Use Only)
52.
TEST 1
F2PIP / Second Tuner 185
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