Multimedia ICs NTSC / PAL digital RGB encoder BU1425AK / BU1425AKV The BU1425AK / BU1425AKV are ICs which convert digital RGB / YUV input to composite (NTSC / PAL / PAL60), luminance (Y), and chrominance (C) signals, and outputs the results. Applications •Video interfaces for VIDEO-CDs and CD-G decoders •1)Features Input clocks supported 27.0 / 13.5MHz 28.636 / 14.318MHz 28.375 / 14.1875MHz 35.4695 / 17.73475MHz 2) 24-bit RGB and 16-bit YUV input signals are supported. 3) Both master and slave systems are supported. 4) 9-bit high-speed DAC is used for DAC output of composite VIDEO, Y, and C signals. 5) Internal 8-color OSD output function is provided. 6) FSC-TRAP on the Y channel can be turned on and off. 7) C channel is equipped with an internal chrominance band-pass filter in addition to the U.V. lowpass filter. 8) 5V single power supply, low power consumption (0.4W typ.) 9) Y and C output can be turned off (the power consumption with Y and C off is 0.25W typ.). 10) In the Master mode, applying 3.3V to the I / O VDD and 5.0V to other VDDs produces HSY and VSY output with an amplitude of 3.3V. This enables direct connection to LSIs that use a power supply voltage of 3.3V. (The clock output for the OSD has a fixed amplitude of 5.0V.) 11) In the Slave mode, applying voltage to the I / O VDD only, and applying 0V to other VDDs, enables a current consumption of 0 even when RGB DATA, HSY, VSY, and OSD DATA are in the active state. 1 Multimedia ICs BU1425AK / BU1425AKV OSDSW ROSD GOSD BOSD •Block diagram RGB 24BITS OSD PALETTE DAC Y-FILTER RD GD / Y LATCH RGB to YUV Y-LEVEL ADJ UV FILTER BD / UV CHROMA GEN MIX SIG and sync burst C-FILTER V VOUT Y YOUT C COUT VCLK RSTB PIXCLK VIDEO TIMING CONTROL SYNC BLANK HSY SUB CARRIER BURST GENERATOR BURST 2 CLKSW NTB PAL60B CDGSWB YFILONB [1.0] IM [0.1] INT ADDH TEST12 MODE CONTROL FIELD / FLAME CONTROL VSY Multimedia ICs BU1425AK / BU1425AKV •Pin descriptions Pin No. Pin name Function Function Pin No. Pin name 1 BOSD OSD BLUE DATA INPUT 33 SLABEB 2 GD0 / Y0 GREEN DATA Bit0 (LSB) 34 ADDH + 0.5 / – 0.5LINE at NON-INTER 3 GD1 / Y1 GREEN DATA Bit1 35 VREF-C DAC BIAS 4 GD2 / Y2 GREEN DATA Bit2 36 CGND CHROMA OUTPUT GROUND 5 GD3 / Y3 GREEN DATA Bit3 37 COUT CHROMA OUTPUT 6 GD4 / Y4 GREEN DATA Bit4 38 VGND Composite Output Ground 7 GD5 / Y5 GREEN DATA Bit5 39 VOUT COMPOSITE OUTPUT 8 GD6 / Y6 GREEN DATA Bit6 40 AVSS Analog Ground (DAC VREF) 9 GND DIGITAL GROUND 41 P-VDD POWER (DAC) VDD 10 GD7 / Y7 GREEN DATA Bit7 (MSB) 42 IR 11 BD0 / UV0 BLUE DATA Bit0 (LSB) 43 AVDD 12 BD1 / UV1 BLUE DATA Bit1 44 YGND Luminance Output Ground 13 BD2 / UV2 BLUE DATA Bit2 45 YOUT Luminance Output 14 BD3 / UV3 BLUE DATA Bit3 46 VDD 15 OSDSW OSD ENABLE / DISABLE 47 YFILON2B Y-FILSEL THROU / FILON2 16 CDGSWB SELECT Video-CD / CD-G 48 YCOFF DAC (YOUTCOUT) OFF 17 BD4 / UV4 BLUE DATA Bit4 49 YFILON1B Y-FILSEL THROU / FILON1 18 BD5 / UV5 BLUE DATA Bit5 50 PAL60B NORMAL / PAL60 at PALMODE 19 BD6 / UV6 BLUE DATA Bit6 51 VCLK Video Clock Input 20 BD7 / UV7 BLUE DATA Bit7 (MSB) 52 RSTB NORMAL / RESET 21 GND DIGITAL GROUND 53 CLKSW 22 NTB SELECT NTSC / PAL MODE 54 RD0 RED DATA Bit0 (LSB) 23 IM0 SELECT YUV / RGB 55 RD1 RED DATA Bit1 24 IM1 SELECT DAC / NORMAL 56 RD2 RED DATA Bit2 25 TEST1 Normally pull down to GND 57 ROSD 26 TEST2 SELECT U / V TIMING 58 RD3 RED DATA Bit3 SELECT MASTER / SLAVE REFERENCE RESISTOR ANALOG (VREF) VDD DIGITAL VDD SEL ×1CLK / ×2CLK OSD RED DATA INPUT 27 VSY V-SYNC INPUT or OUTPUT 59 RD4 RED DATA Bit4 28 HSY H-SYNC INPUT or OUTPUT 60 RD5 RED DATA Bit5 29 PIXCLK 1 / 2freq. of BCLK 61 IOVDD ∗ VDD for I / O 30 VDD DIGITAL VDD 62 RD6 RED DATA Bit6 31 IOVDD VDD for I / O 63 RD7 RED DATA Bit7 32 INT Interlace / Non-Interlace 64 GOSD OSDGREEN DATA INPUT ∗ With pull-down resistor (approx. 30kΩ ) 3 Multimedia ICs BU1425AK / BU1425AKV •Absolute maximum ratings (Ta = 25°C) Parameter Applied voltage Symbol Limits Unit VDD, AVDD – 0.5 ~ + 7.0 V Input voltage – 0.3 ~ IOVDD + 0.3 V Tstg – 55 ~ + 150 °C Pd 1350∗1 mW VIN Storage temperature Power dissipation ∗1 Reduced by 11mW for each increase in Ta of 1°C over 25°C. ∗1 When mounted on 120mm × 140mm × 1.0mm glass epoxy board. ∗ Operation is not guaranteed at this value. 䊊 Not designed for radiation resistance. •Recommended operating conditions Symbol Limits Unit Power supply voltage Parameter VDD = AVDD∗ 4.50 ~ 5.50 V Power supply voltage IOVDD 3.30 ~ 5.50 V Input high level voltage VIH 2.1 ~ VDD V Input low level voltage VIL 0 ~ + 0.8 V Analog input voltage VAIN 0 ~ AVDD V Operating temperature Topr °C – 25 ~ + 60 ∗ Should be used at VDD = AVDD. •Electrical characteristics (unless otherwise noted, Ta = 25°C, V DD Parameter = AVDD = 5.0V, GND = AVSS = VGND = CGND = YGND) Symbol Min. Typ. Max. Unit Burst frequency 1 fBST1 — 3.57954 — MHz Burst frequency 2 fBST2 — 4.43361 — MHz Burst cycle Conditions 〈Digital block〉 CBST — 9 — CYC Operating circuit current 1 Idd1 — 80 — mA 27MHz color bar Operating circuit current 2 Idd2 — 40 — mA 27MHz color bar PD mode Output high level voltage VOH 4.0 4.5 — V IOH = – 2.0mA Output low level voltage VOL — 0.5 1.0 V IOH = 2.0mA Input high level voltage VIH 2.1 — — V Input low level voltage VIL — — 0.8 V Input high level current IIH – 10 0.0 10.0 µA Input low level current IIL – 10 0.0 10.0 µA 〈DAC block〉 — BITS ± 3.0 LSB 25.14 — mA 7.24 — mA 0.0 10.0 µA — 25.14 — mA IYB — 7.24 — mA IYZ – 10 0.0 10.0 µA — — 1.0 µA RES — EL — Y white level current IYW — Y black level current IYB — Y zero level current IYZ – 10 V white level current IYW V black level current V zero level current Sleep mode current Iddpd DAC resolution Linearity error 4 9 ± 0.5 IR = 1.2kΩ VIN Max. = IOVDD + 0.3V VIN Min. = – 0.3V 25 26 27 28 29 30 31 32 SLABEB ADDH VREF CGND COUT VGND VOUT AVSS AVDD IR AVDD YGND YOUT VDD YFILON2B YCOFF 35 36 37 38 39 40 41 42 43 44 45 46 47 48 BU1425AK / AKV 9 8 7 6 5 4 3 2 1 GND GD6 GD5 GD4 GD3 GD2 GD1 GD0 BOSD BD1 11 12 BD2 10 13 BD3 GD7 14 OSDSW BD0 16 15 CDGSWB GOSD RD7 RD6 I / O VDD RD5 RD4 RD3 ROSD RD2 RD1 RD0 CLKSW RSTB VCLK PAL GOB YFILON1B 64 63 62 60 59 58 57 55 56 54 MAIN VDD 5.0 V 24 Pixel Clock in Y-filter select Reset [Low active] in 3 SLEEP MODE CTL L: SLEEP H: NORMAL 23 4 I / O VDD 5.0V or 3.3V 22 6 5 Luminance 21 34 7 75 20 Composite 1.2k 19 BD4 BD5 BD6 BD7 GND NTB IM0 IM1 TEST1 TEST2 VSY HSY PIXCLK VDD I / O VDD INT 75 18 33 DIGITAL GND INTERLACE / NON-INTER PAL / NTSC 3 Chrominance 17 0.01µF ANALOG GND 4 5 6 7 75 POWER GND OSD CLOCK Vsync out Hsync out B Data 0...7 G Data 0...7 R Data 0...7 OSD enable OSD in [Blue] OSD in [Green] [Red] OSD in Video-CD / CD-G Multimedia ICs BU1425AK / BU1425AKV example •(1)Application Example in Master mode: Doubled clock is input and 24-bit RGB input is used 2 1 0 2 1 0 7 6 61 5 4 3 2 1 0 53 52 51 50 49 ANALOG VDD POWER VDD DIGITAL VDD Fig.1 5 27 28 29 30 31 32 0.01µF Fig.2 SLABEB ADDH VREF CGND COUT VGND VOUT AVSS AVDD IR 35 36 37 38 39 40 41 42 YGND YOUT VDD YFILON2B YCOFF 44 45 46 47 48 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 CDGSWB OSDSW BD3 BD2 BD1 BD0 GD7 GND GD6 GD5 GD4 GD3 GD2 GD1 GD0 BOSD 64 63 62 60 59 58 57 55 56 54 MAIN VDD 5.0V 26 BU1425AK / AKV GOSD RD7 RD6 I / O VDD RD5 RD4 RD3 ROSD RD2 RD1 RD0 CLKSW RSTB YCLK PAL GOB YFILON1B SLEEP MODE CTL L: SLEEP H: NORMAL 25 Pixel Clock in Y-filter select Reset [Low active] in 3 I / 0 VDD 5.0V or 3.3V 24 4 Luminance 23 6 5 75 22 34 7 AVDD 21 1.2k 20 75 19 BD4 BD5 BD6 BD7 GND NTB IM0 IM1 TEST1 TEST2 VSY HSY PIXCLK VDD I / O VDD INT Composite Chrominance 18 75 17 33 ANALOG GND 4 5 6 7 POWER GND OSD CLOCK DIGITAL GND 3 43 6 INTERLACE / NON-INTER PAL / NTSC Hsync in Vsync in U.V Data 0...7 Y Data 0...7 [Blue] OSD in [Green] OSD in [Red] OSD in OSD enable Video-CD / CD-G Multimedia ICs BU1425AK / BU1425AKV (2) Example in Slave mode: Doubled clock is input and 16-bit YUV input is used 2 1 0 2 1 0 7 6 61 5 4 3 2 1 0 53 52 51 50 49 ANALOG VDD POWER VDD DIGITAL VDD Multimedia ICs BU1425AK / BU1425AKV •Equivalent circuits Pin No. Pin name I/O Equivalent circuit Function 2~8 10 GD (7: 0) I G data input pin for 24-bit RGB input Y data input pin for 16-bit YUV input 11 ~ 14 17 ~ 20 BD (0: 7) I B data input pin for 24-bit RGB input U, V data input pins for 16-bit YUV input 54 ~ 56 58 ~ 60 62.63 RD (0: 7) I R data input pin for 24-bit RGB input 1 57 64 15 ROSD GOSD BOSD OSDSW I OSD data input pin when using the OSD function. When the OSDSW pin is HIGH, input to the ROSD, GOSD, and BOSD pins takes precedence over RGB, and the data is converted. 23 24 IM0 IM1 I Control pins used to select RGB (24bit), YUV (16-bit) or DAC Through as the input mode. 16 CDGSWB I Switches the mode between VideoCD (HIGH) and CD-G (LOW). 22 NTB I Switches the mode between NTSC (LOW) and PAL (HIGH). 7 Multimedia ICs Pin No. I/O Equivalent circuit Function 28 HSY I/O This is the horizontal synchronization signal pin. Negative polarity Hsync signals are input (when SLABEB = LOW) or output (when SLABEB = HIGH) here. This is also used as the synchronization signal for fixing the PIXCLK output phase. 27 VSY I/O Vertical synchronization signals (Vsync) are input (when SLABEB = LOW) or output (when SLABEB = HIGH) here. O The internal processing clock is divided in half and output. Data is read at the point at which the edge of this clock changes. This can also be used as the clock for the OSD IC. I This pin switches between interlace (when HIGH) and non-interlace (when LOW) modes. This pin is effective in both the VIDEO-CD and CD-G modes. I I This pin switches between the Master (when HIGH) and Slave (when LOW) modes. It is effective in the noninterlace mode, and it switches between – 0.5 lines (when LOW) and + 0.5 lines (when HIGH) for the number of lines in an interlace field. 29 32 33 34 8 Pin name BU1425AK / BU1425AKV PIXCLK INT SLABEB ADDH 35 VREF-C I This is the reference voltage generator circuit monitoring pin which determines the output amplitude (output current for 1 LSB) of the DAC. A 0.01µF capacitor should be attached between this and pin 43 (AVDD). 37 COUT O This is the chrominance output pin for the S pin. Multimedia ICs BU1425AK / BU1425AKV Pin No. Pin name I/O 39 VOUT O Composite output pin 45 YOUT O Luminance output pin for the S pin I The output amplitude (output current for 1 LSB) of the DAC is specified using an external resistor, and this pin controls the value of the current flowing per bit. 42 IR Equivalent circuit Function 48 YCOFF I When there is HIGH input at the signal input pin which switches to and from the low power consumption mode, this turns off the output from the YOUT and COUT pins. 51 VCLK I Input pin for the reference clock in the Video-CD mode 52 RSTB I Reset input pin which initializes the system. The system is reset when this goes LOW. 49 YFILON1B YFILON2B I Selects the F characteristic of the Y-FILTER. 9 Multimedia ICs Pin No. 50 PAL60B 53 CLKSW 25 26 TEST1 TEST2 31 46 61 41 43 10 Pin name BU1425AK / BU1425AKV I/O Equivalent circuit Function I Switches between the PAL and PAL60 modes. This is effective only when the NTB pin is HIGH. (PAL mode only) I This switches between dividing the VCLK input in half and using it as an internal clock (when LOW), and using it as an internal clock without dividing it in half (when HIGH). I Normally, this is connected to the GND pin. However, when 16-bit YUV input is used, the TEST2 pin can be used as the U and V timing control pins. AVDD IOVDD Power supply pin for the digital, the analog, and I / O blocks 9 21 36 38 40 44 GND CGND VGND AVSS YGND Grounding pin for the digital and analog blocks 30 VDD Digital VDD. Equipped with pull-down resistor. Multimedia ICs BU1425AK / BU1425AKV operation •(1)Circuit Overview chrominance data. At the same time, a clock with a frequency half that of the internal clock is output from the PIXCLK pin. As a result, the PIXCLK pin can easily be directly connected to the OSD IC clock input pin, and the OSDSW pin can be directly connected to the BLK output pin. Thus, the BU1425AK and the OSD IC can be synchronized, and OSD text with a burster trimmer stacker feature can be used. If the input data is in the RGB format, it is converted to YUV. If it is in the YUV format, it is converted from the CCIR-601 format to level-shifted YUV data. The YUV data is then adjusted to the 100IRE level in the NTSC, PAL, and PAL60 modes, and U and V data is phaseadjusted by a sub-carrier generated internally, and is modulated to chrominance signals. Ultimately, elements such as the necessary synchronization level, the color blanking level, and burst signals are mixed, and pass through the 9-bit DAC to be output as NTSC or PAL composite signals, luminance signals, and chrominance signals (conforming to RS-170A). At this point, the DAC is operating at twice the internal clock, making it possible to reduce the number of attachments. Furthermore, luminance signal output and chrominance signal output can be turned off. At this point, it is possible to reduce the level of power consumption. The DAC output is current output. If a resistor of a specified value is connected to the IR pin, 2.0VP-P output can be obtained by connecting 75Ω to the VOUT pin as an external resistor. As a result, normally, when a video input pin (75Ω terminus) is connected, the output is approximately 1.0VP-P voltage output at a white 100% level. The BU1425AK / AKV converts digital images and video data with an 8-bit configuration to 9-bit composite signals (VOUT), luminance signals (YOUT), and chrominance signals (COUT) for the NTSC, PAL, and PAL60 formats, and outputs the converted data as analog TV signals. The user may select whether VOUT consists of chrominance signals that have passed through a chrominance band pass and luminance signals that have been mixed, or luminance signals that have passed through a chrominance trap and luminance signals that have not passed through a chrominance trap. The F characteristic of this chrominance trap may be selected from among three available types. Since YOUT normally does not pass through the trap, it is optimum for the S pin. COUT normally passes through the chrominance band pass, and is thus highly resistance to dot interference. In addition, when used in the doubled clock mode, it passes through an interpolator filter, and for that reason is able to reproduce even cleaner image quality. A correspondence can be set up between input digital image data and Video-CD and CD-G decoder output. Output TV signals, in addition to switching among the NTSC, PAL, and PAL60 modes, can be switched between the interlace and non-interlace modes. The data clock input to the VCLK pin can also be input as a doubled clock for the data rate (in doubled clock modes). In doubled clock modes, data is read and processed at the rising edge of an internal clock that has been divided in half. In ordinary clock modes, data is read and processed at the rising edge of the clock that has the same phase as the input clock. Two input data formats are supported: 24-bit RGB (4: 4: 4) and 16-bit YUV (4: 2: 2). These are input to RD0 to 7, GD0 to 7, and BD0 to 7, respectively. The selected input format can be switched using the IM0 and IM1 pin input. When the OSDSW pin is set to the "Enabled" (H) state, data input to the ROSD, GOSD, and BOSD pins becomes effective, making it possible to input 7-color (8 including black) (2) Specifying the mode 1) Power saving mode With the BU1425AK / AKV, setting the YCOFF pin to HIGH turns off the output from the YOUT and COUT pins of the DAC output, enabling use in the low power consumption mode. Table 1: Low power consumption mode with the YCOFF pin Pin No. 48 Output Mode and Power Consumption Pin Name YCOFF VOUT pin YOUT pin COUT pin Power consumption (typ.) LOW Composite signal Luminance signal Chrominance signal 0.45W HIGH Composite signal No output (0V) No output (0V) 0.25W 11 Multimedia ICs BU1425AK / BU1425AKV 2) Output modes The “Video-CD” and “CD-G” modes can be supported by both digital image and video data, with the mode being switched by the CDGSWB pin input. When the CDGSWB pin input is LOW, the CD-G mode is set, and when HIGH, the Video-CD mode is set. Also, the “NTSC”, “PAL”, and “PAL60” modes may be selected as the output TV modes. The output TV mode is switched using the NTB and PAL60 pin input. Setting the NTB pin input to LOW sets the NTSC mode, and setting it HIGH with the PAL60 pin also HIGH sets the PAL mode. Setting the NTB pin HIGH and the PAL60 pin LOW, sets the PAL60 mode. Table 2: Specifying modes Decoder mode TV mode 0 CD-G NTSC 1 Video-CD NTSC 0 CD-G PAL60 1 Video-CD PAL60 0 CD-G PAL 1 Video-CD PAL NTB PAL60 CDGSWB 0 0 ∗ ∗ 1 0 1 0 1 1 1 1 Also, INT pin input can be used to switch between “interlace output” and “non-interlace output.” Setting the input to LOW enables non-interlace output, and setting it to HIGH enables interlace output. When non-interlace output is used, the number of lines in one field can be controlled using the ADDH pin. If the ADDH pin is LOW, the number of lines in one field is set to the number of interlace output lines minus 0.5 lines, and when HIGH, the number of lines in one field is set to the number of interlace output lines plus 0.5 lines. Table 3: Pin settings for interlace / non-interlace modes No. of Lines / Field INT ADDH Scan Mode 0 0 Non-interlace 0 1 Non-interlace 263 313 1 ∗ Interlace 262.5 312.5 NTSC / PAL60 PAL 262 312 3) Input formats The digital data input format can be set as shown in the table below, using the IM1 and IM0 pins. Both 24-bit RGB (4: 4: 4) and 16-bit YUV (4: 2: 2) are supported. In addition, digital RGB input can be output as analog RGB output (RGB Through mode). Table 4: Input format settings 12 IM1 IM0 Input format Output signal 0 0 R (8 bits), G (8 bits), B (8 bits) TV signals (9-bit resolution) 0 1 16-bit YUV (4: 2: 2) TV signals (9-bit resolution) 1 0 — — 1 1 ROSD, GOSD, BOSD expanded to RGB input RGB analog signals (9 bits) Multimedia ICs BU1425AK / BU1425AKV Table 5: Bit assignments in RGB Through mode Output Pin BIT8 BIT7 BIT6 BIT5 BIT4 BIT3 BIT2 BIT1 BIT0 YOUT (45) RD7 RD6 RD5 RD4 RD3 RD2 RD1 RD0 ROSD VOUT (39) GD7 GD6 GD5 GD4 GD3 GD2 GD1 GD0 GOSD COUT (37) BD7 BD6 BD5 BD4 BD3 BD2 BD1 BD0 BOSD The BU1425AK / AKV has an internal OSD switch and chrominance data generating function. Consequently, joint usage of an OSD-IC with blanking and R, G, and B output can be easily supported by the OSD. Moreover, a clock with half the internal processing frequency of the BU1425AK is output from the PIXCLK pin, and can be connected to the OSD-IC clock input, enabling the timing to be captured. ROSD, GOSD, and BOSD pin input is effective as long as the OSDSW pin input is HIGH. The relationship between OSD data and chrominance data is as shown in Table 6 below. Table 6: Correspondence between OSD function, input data and chrominance output OSDSW ROSD GOSD BOSD Output Chrominance Signal 1 0 0 0 Black (blanking) 1 0 0 1 Blue 1 0 1 0 Green 1 0 1 1 Cyan 1 1 0 0 Red 1 1 0 1 Magenta 1 1 1 0 Yellow 1 1 1 1 White 0 ∗ ∗ ∗ Based on input specified by IM0 and IM1 4) Clock modes With the BU1425AK / AKV, clock input is available at the VCLK pin. Clocks supplied from an external source should basically be input at a frequency double that of clocks used internally (basic clock: BCLK) (when the CLKSW pin is LOW). The phase relationship between the internal clock and the external clock at this time is as shown in Fig. 3, with the HSY pin input serving as a reference. In the Master mode, in which data from the HSY pin is output and used, HSY is output at the timing shown in Fig. 3. With the BU1425AK, data (RD, GD, BD, etc.) is read at the rising edge of the internal clock (BCLK), so data should be input to the BU1425AK / AKV as shown in Fig. 3. HSY VCLK Internal clock (BCLK) Input data Fig. 3 Illustration of clock timing (CLKSW is LOW) 13 Multimedia ICs BU1425AK / BU1425AKV Also, setting the CLKSW pin to HIGH enables the frequency of the external clock to be used as BCLK, the internal clock, just as it is. Since the data is read to the BU1425AK / AKV at the rising edge of BCLK at this time as well, data should be input as shown in Fig. 4. The relationship with HSY is also as shown in Fig. 4. HSY VCLK Internal clock (BCLK) Input data Fig. 4 Illustration of clock timing (CLKSW is HIGH) With the BU1425AK / AKV, the sub-carrier (burst) frequency is generated using the internal clock. For this reason, the frequencies used in the various modes are limited, so those frequencies should be input (see Table 7 below). Table 7: BU1425AK / AKV clock input frequency settings CLKSW Pin Video-CD Mode NTSC PAL / PAL60 0 27.000MHz 28.636MHz 28.3750MHz 1 13.500MHz 14.318MHz 14.1875MHz 5) Synchronization signals The BU1425AK / AKV has an "Encoder Master" mode in which synchronization signals are output, and an "Encoder Slave" mode in which synchronization signals are input from an external source and used to achieve synchronization. These modes are switched at the SLABEB pin. When the SLABEB pin is LOW, the Slave mode is in effect, and when HIGH, the Master mode is in effect. In the Master mode, the HSY and VSY pins serve as output, with horizontal synchronization signals (HSYNC) being output from the HSY pin and vertical synchronization signals (VSYNC) from the VSY pin. At this time, the reference timing for synchronization signal output is determined at the rising edge of the RSTB pin. Output is obtained in accordance with the specified mode (NTSC, PAL, or PAL60, interlace or non-interlace). Output in the 14 CD-G Mode Same for NTSC / PAL / PAL60 non-interlace mode, however, is output only under "Odd" field conditions (the falling edges of Hsy and Vsy are the same). In the Slave mode, the HSY and VSY pins serve as input, and horizontal synchronization signals (HSYNC) should be input to the HSY pin and vertical synchronization signals (VSYNC) to the VSY pin. The input synchronization signals at this time should be input in accordance with the specified mode. With the BU1425AK / AKV, field distinction between odd and even fields is made automatically for each field when interlace input is used. With the BU1425AK, all synchronization signals are treated as negative polarity signals (signals for which the sync interval goes LOW). When using the non-interlace mode, operation is normally carried out under odd field conditions (the falling edges of Hsy and Vsy are simultaneous). Multimedia ICs BU1425AK / BU1425AKV 6) Y filter With the BU1425AK / AKV, the frequency characteristic of Y, which is mixed with the VOUT pin output, is set so that it can be selected using the YFILON1B and 2B pins. A through filter is normally used on the YOUT pin output, so that it is not limited to this method. Table 8: Frequency characteristic of the Y channel YFILON2B YFILON1B Frequency characteristic of the Y channel H H TRAP filter through (same signal as YOUT pin output is mixed with VOUT) L H chart1 H L chart2 L L chart3 5 180 0 135 0 135 –5 90 –5 90 – 10 45 – 10 45 – 15 0 – 20 – 45 – 25 – 90 – 30 – 135 – 35 – 180 – 40 100 1000 AMPLITUDE (dB) 180 PHASE (deg) AMPLITUDE (dB) 5 – 15 0 – 20 – 45 – 25 – 90 – 30 – 135 – 180 – 35 – 40 100 10000 20000 PHASE (deg) 10 10 1000 10000 20000 FREQUENCY (kHz) FREQUENCY (kHz) Gain-Phase Graphic Gain-Phase Graphic Fig.5 chart1 (BCLK = 13.5MHz) Fig.6 chart2 (BCLK = 13.5MHz) 5 180 0 135 –5 90 – 10 45 – 15 0 – 20 – 45 – 25 – 90 – 30 – 135 – 35 – 180 – 40 100 1000 PHASE (deg) AMPLITUDE (dB) 10 10000 20000 FREQUENCY (kHz) Gain-Phase Graphic Fig.7 chart3 (BCLK = 14.318MHz) 15 Multimedia ICs BU1425AK / BU1425AKV (3) Output level Figures 8 to 10 indicate the digital data values for the DAC output when the color bars from the various pins are reproduced. WHITE YELLOW CYAN GREEN MAGEN RED BLUE BLACK BLACK LEVEL = PEDESTAL LEVEL SYNC TIP LEVEL Fig. 8 YOUT output W H I T E BLACK LEVEL Y E L L O W C Y A N G R E E N M A G E N T A R E D B L U E B L A C K COLOR BURST Fig. 9 COUT output W H I T E Y E L L O W C Y A N BLACK LEVEL = PEDESTAL LEVEL SYNC TIP LEVEL Fig. 10 VOUT output 16 G R E E N M A G E N T A R E D B L U E B L A C K Multimedia ICs BU1425AK / BU1425AKV Table 9: BU1425AK color bar input / output data Input (8-bit hexadecimal for each) RGB24bit Output (9-bit hexadecimal for each) YUV (4: 2: 2) NAME&COLOR YOUT COUT VOUT RD GD BD YD UD VD — — — — — — SYNC TIP — 000 — — — — — — Color Burst NTSC — ± 033 ± 033 — — — — — — Color Burst PAL — ± 038 ± 038 — — — — — — BLANK LEVEL — 100 — 00 00 00 10 80 80 BLACK (Pedestal) 072 000 072 00 00 FF 28 F1 6D BLUE 092 ± 072 ± 072 00 FF 00 90 36 22 GREEN 117 ± 096 ± 096 00 FF FF A9 A5 10 CYAN 138 ± 0A0 ± 0A0 FF 00 00 51 5A F0 RED 0C6 ± 0A0 ± 0A0 FF 00 FF 6A C9 DD MAGENTA 0E6 ± 096 ± 096 FF FF 00 D2 0E 92 YELLOW 16C ± 072 ± 072 FF FF FF EB 80 80 WHITE 18C 000 000 000 ∗ COUT and VOUT display the chrominance amplitude. COUT is C8H ± XXXH. VOUT is YOUT ± XXXH. (4) Timing Table 10 below shows the input and output pins related to timing. Table 10: BU1425AK timing-related input / output pins Pin No. Pin name I/O Function 52 RSTB I System reset input pin 51 VCLK I Clock input pin 53 CLKSW I Clock input mode setting pin 27 VSY I/O Vertical synchronization signal I / O pin 28 HSY I/O Horizontal synchronization signal I / O pin 16 CDGSWB I Video-CD / CD-G mode switching pin 22 NTB I NTSC / PAL mode switching pin 50 PAL60B I PAL / PAL60 mode switching pin 32 INT I Interlace / Non-interlace mode switching pin 33 SLABEB I Master / Slave mode switching pin 34 ADDH I Pin which adds 1 line in non-interlace mode 29 PIXCLK O 1 / 2 divider output for internal clock (OSD clock) 17 Multimedia ICs BU1425AK / BU1425AKV 1) Input clocks and input data timings in the various operation modes There are slight differences in the input data and the clock timing, depending on which mode is being used. What is shared by all modes is that, with the BU1425AK / AKV, data is read and discharged at the rising edge of the internal clock. The illustration below shows the input conditions in the various modes. 1. Master mode, ∗1 clock mode Encoder master (pin 33 = H) Internal clock = input clock (pin 53 = H) VCLK (pin53) Internal clock (BCLK) Input data Output data (HSY, VSY) Tds1 Fig.11 ∗ In this mode, the internal clock (BCLK) begins to operate at the same phase as the VCLK input, following the rise of the RSTB pin (pin 52). Table 11 Parameter Data setup time 1 18 Symbol Min. Typ. Max. Tds1 10 — — Multimedia ICs BU1425AK / BU1425AKV 2. Master mode, doubled clock mode Encoder master (pin 33 = H) Internal clock = 2∗ input clock (pin 53 = H) VCLK (pin53) Internal clock (BCLK) Input data Output data (HSY, VSY) Tds2 Fig.12 ∗ In this mode, the internal clock (BCLK) begins to operate at a halved frequency at the rise of the VCLK input, following the rise of the RSTB pin (pin 52). Table 12 Parameter Data setup time 2 Symbol Min. Typ. Max. Tds2 10 — — 3. Slave mode, ∗1 clock mode Encoder slave (pin 33 = H) Internal clock = input clock (pin 53 = H) VCLK (pin53) Internal clock (BCLK) Input data Input data (HSY, VSY) Tds3S Tsh1 Tds3H Tsd1 Fig.13 19 Multimedia ICs BU1425AK / BU1425AKV ∗ In this mode, the internal clock (BCLK) begins to operate at the same phase as the VCLK input, following the rise of the RSTB pin (pin 52). Table 13 Parameter Symbol Min. Typ. Max. Data setup time 3S Tds3S 5 — — Data hold time 3H Tds3H 8 — — Sync signal setup time Tsd1 5 — — Sync signal hold time Tsh1 8 — — 4. Slave mode, doubled clock mode Encoder slave (pin 33 = L) Internal clock = 2∗ input clock (pin 53 = L) VCLK (pin53) Internal clock (BCLK) Input data Input data (HSY, VSY) Tds4 Tsh2 Tsd2 Fig.14 ∗ In this mode, the internal clock (BCLK) begins to operate at a halved frequency at the rise of the VCLK input, following the rise of the RSTB pin (pin 52). When HSY is input, phase correction is carried out at the falling edge, as shown in Fig. 14. (In other words, the phase of the internal clock (BCLK) is not determined until HSY is input.) Table 14 Parameter Symbol Min. Typ. Max. Data setup time 4 Tds4 10 — — Sync signal hold time 2 Tsh2 10 — — Sync signal setup time 2 Tsd2 10 — — 20 Multimedia ICs BU1425AK / BU1425AKV 2) Clock timing when the OSD function is used Eight-color OSD color with a burster trimmer stacker feature can be used, simply by connecting an OSD with external clock input. Output from the PIXCLK pin of the BU1425AK should be input to the OSC-IN of the OSD IC. The OSDSW input pin can be used as a signal for the burster trimmer stacker feature called VBLK, or a similar name. (See page 13 for a table showing the correspondence between input data and color output.) Internal clock (BCLK) HSY (IN / OUT) PIXCLK OSDSW ROSD.GOSD V.Y.C.OUT VIDEO-DATA BLACK YELLOW VIDEO-DATA Fig. 15 Clock timing with the OSD function ∗ The frequency of the PIXCLK pin output is one-half that of the internal clock. This phase is determined at the rising edge of HSY, as shown in Fig.15. (In the Encoder Master mode, phase correction is implemented using the HSY output of the BU1425AK itself.) The OSD function is effective only during the time that video output is enabled. (See the TV signal timing diagram on page 27.) 21 Multimedia ICs BU1425AK / BU1425AKV 3) Output timing 1. Master mode, doubled clock mode Encoder master (pin 33 = H) Internal clock = input clock∗ 1 / 2 (pin 53 = L) VCLK Internal clock (BCLK) Thdr HSY (OUT) Thdf VSY (OUT) Tvdf PIXCLK (OUT) Tpdr Tvdr Fig. 16 Output timing with a doubled clock Table 15 Parameter Symbol Min. Typ. Max. HSY output delay Thdr Thdf — 14 — VSY output delay Tvdr Tvdf — 14 — PIXCLK output delay Tpdr Tpdf — 14 — 22 Multimedia ICs BU1425AK / BU1425AKV 2. Master mode, regular clock mode Encoder master (pin 33 = H) Internal clock = input clock (pin 53 = L) VCLK Internal clock (BCLK) HSY (OUT) Thdf VSY (OUT) Tvdf PIXCLK (OUT) Tpdr Thdr Tvdr Fig. 17 Output timing with a clock at the regular frequency Table 16 Parameter Symbol Min. Typ. Max. HSY output delay Thdr Thdf — 10 — VSY output delay Tvdr Tvdf — 10 — PIXCLK output delay Tpdr Tpdf — 10 — 23 Multimedia ICs BU1425AK / BU1425AKV 4) Odd / even recognition timing in Slave mode 1. Timing based on recognition of odd conditions The BU1425AK / AKV distinguishes whether the conditions of each field (each time that VSY is input) are odd or otherwise, and internal operation is carried out based on that recognition after the data is input. As a result, HSY and VSY are input under input conditions appropriate to the specified mode, enabling regulated output for the first time. Odd input conditions are indicated below. Timing that does not match these conditions is recognized as an even field. HSY VSY Tvl Expanded view HSY VSY Thvdiff Fig. 18 Odd recognition conditions Table 17: Odd recognition conditions Parameter VSY input L interval VSY Delay from HSY Symbol Unit Min. Typ. Max. Tvl BCLK 128 — — Thvdiff BCLK HSY falling edge – 1clk — HSY Rising edge – 2clk ∗ BCLK = One cycle of internal clock 24 Multimedia ICs BU1425AK / BU1425AKV 2. Even timing The BU1425AK / AKV distinguishes whether the conditions of each field (each time that VSY is input) are odd or otherwise, and internal operation is carried out based on that recognition after the data is input. As a result, HSY and VSY are input under input conditions appropri- ate to the specified mode, enabling regulated output for the first time. Timing that does not match the odd field conditions is recognized as an even field. In order to prevent malfunctioning of the internal HSY counter, however, there are regulations which apply to the timing at which VSYNC is input in even fields. HSY VSY Tvl Expanded view T = 1 / Fhsync The middle of HSY HSY T = 1 / Fhsync∗1 / 2 T = 1 / Fhsync∗1 / 2 VSY Thvdiff Fig. 19 Even conditions Table 18: Even conditions Symbol Unit Min. Typ. Max. VSY input L interval Parameter Tvl BCLK 128 — — VSY Delay from The middle of HSY Thvdiff BCLK The middle of HYS – 128clk — HSY Falling edge – 128clk ∗ BCLK = One cycle of internal clock 25 Multimedia ICs BU1425AK / BU1425AKV VOUT (39) BURST BURST BURST BURST YOUT (45) COUT (37) Td1 Td2 Td3 Td4 Td5 Fig. 20 TV signal timing diagram Table 19 NTSC Parameter Symbol Unit SYNC rise Td1 Burst start Td2 Burst end Data start 1-line interval 26 PAL60 PAL V-CD CD-G V-CD CDG1 V-CD CDG1 BCLK 64 67 64 67 64 67 BCLK 71 76 71 75 71 75 Td3 BCLK 106 112 106 112 106 112 Td4 BCLK 128 135 142 149 128 135 Td5 BCLK 858 910 864 908 858 902 VOUT (39pin) Vsync (27pin) Hsync (28pin) VOUT (39pin) Vsync (27pin) Hsync (28pin) 259 260 523 261 524 262 525 263 1 265 Even_Field 264 Odd_Field 2 3 266 4 267 ∗ Indicates a line interval during which video data is output 522 5 268 6 269 7 270 8 271 9 272 10 273 11 274 12 ∗ 18 281 19 282 20 Multimedia ICs BU1425AK / BU1425AKV Frame timing in Video-CD mode (NTSC / PAL60: Interlace) Fig. 21 27 28 Fig.22 VOUT (39pin) Vsync (27pin) Hsync (28pin) VOUT (39pin) Vsync (27pin) Hsync (28pin) 310 623 312 625 2 313 315 3 Even_Field∗4 314 Odd_Field∗4 1 316 4 317 5 318 6 319 7 320 8 321 9 322 10 ∗3 Indicates a line interval during which video data is output ∗4 First and second have been added to aid in explanation, but there is no actual distinction. 311 624 323 11 324 12 335 23 336 ∗3 24 337 25 Multimedia ICs BU1425AK / BU1425AKV Frame timing in Video-CD mode (PAL: Interlace) VOUT (39pin) Vsync (27pin) Hsync (28pin) VOUT (39pin) Vsync (27pin) Hsync (28pin) 259 521 261 523 262 524 2 3 265 Second_Field∗4 264 First_Field∗4 263 1 266 4 267 5 268 6 269 7 270 8 271 9 272 10 ∗3 Indicates a line interval during which video data is output ∗4 First and second have been added to aid in explanation, but there is no actual distinction. 260 522 273 11 274 12 281 ∗3 18 282 19 20 Multimedia ICs BU1425AK / BU1425AKV Frame timing in CD-G mode (NTSC / PAL60: Non-interlace) Fig.23 29 30 Fig.24 VOUT (39pin) Vsync (27pin) Hsync (28pin) VOUT (39pin) Vsync (27pin) Hsync (28pin) 310 622 312 624 2 3 315 Second_Field∗4 314 First_Field∗4 313 1 316 4 317 5 318 6 319 7 320 8 321 9 322 10 ∗3 Indicates a line interval during which video data is output ∗4 First and second have been added to aid in explanation, but there is no actual distinction. 311 623 323 11 324 12 335 23 336 ∗3 24 337 25 Multimedia ICs BU1425AK / BU1425AKV Frame timing in CD-G mode (PAL: Non-interlace) Multimedia ICs BU1425AK / BU1425AKV (5) Adjustment of the DAC output level The voltage level of the DAC output is determined by the DAC internal output current and the DAC output external resistor. The output current per 1 DAC bit is determined by the external resistor of the IR pin (pin 42), as shown below. the following results: I (1LSB) = VVREF/RIR ∗1 / 16 [A] ... (equation 6-1) VVREF ... Voltage generated by the regulator circuit in the BU1425AK [V] RIR ... External resistor for the IR pin 1200[Ω] (6) YUV input mode With the BU1425AK, setting the IM0 pin (pin 23) to HIGH enables a 16-bit YUV input format to be supported. At that time, the timing of U and V can be reversed when data is input, using the H / L state of the Test2 pin. The input conditions for this mode are shown below. Consequently, when VVREF = 1.3V and RIR = 1200Ω, a current of 67.71µA per 1LSB is output. Because the white level of Y is a digital value of 396 (decimal value), 0 1 V (Y white) = 0.0677 × 396 = 26.81mA At this point, if the DAC output external resistance is 37.5Ω, an amplitude of 1.005VP-P is obtained. 2 2n 2n + 1 Internal clock (BCLK) HSY Y-Data U.V-Data Y1 Y2 Y3 Y4 Y5 U1 V1 U3 V3 U5 Y1 Y2 Y3 Y4 Y5 U1 V1 U3 V3 U5 Fig. 25 YUV input timing when TEST[2] = L 0 1 2 2n 2n + 1 Internal clock (BCLK) HSY Y-Data U.V-Data Fig. 26 YUV input timing when TEST[2] = H 31 Multimedia ICs BU1425AK / BU1425AKV ∗ Reversal of the U and V timing using the H / L state of TEST[2] can be controlled regardless of whether CLKSW is HIGH or LOW (the input clock is a doubled clock or not). ∗ When using the RGB input mode, TEST[2] should be fixed at LOW. ∗ In the Master mode, HSYNC is output at the timing shown in Fig. 26. For that reason, the timing of U and V should be determined by counting from that falling edge. In the Slave mode, the HSY, U, and V data should be input at the timing shown in Fig. 26. Table 20 TEST2 (pin26) CLKSW (pin53) 0 0 0 1 In a doubled clock mode, the timing of U and V is as shown in Fig. 7-1. In a regular clock mode, the timing of U and V is as shown in Fig. 7-1. 1 1 0 1 In a doubled clock mode, the timing of U and V is as shown in Fig. 7-2. In a regular clock mode, the timing of U and V is as shown in Fig. 7-2. •External dimensions (Units: mm) BU1425AK BU1425AKV 48 16 0.8 0.35 ± 0.1 0.15 ± 0.1 0.15 QFP-A64 32 17 64 0.5 16 0.5 12.0 ± 0.3 10.0 ± 0.2 33 32 49 1 1.4 ± 0.1 1 0.5 17 64 0.10 2.7 ± 0.1 12.0 ± 0.3 10.0 ± 0.2 32 49 0.05 16.4 ± 0.3 14.0 ± 0.2 16.4 ± 0.3 14.0 ± 0.2 48 33 0.125 ± 0.1 0.2 ± 0.1 0.1 VQFP64