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TDA8722 Scheda tecnica(PDF) 7 Page - NXP Semiconductors |
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TDA8722 Scheda tecnica(HTML) 7 Page - NXP Semiconductors |
7 / 28 page 1998 Jun 23 7 Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound TDA8722 Table 1 Data format; notes 1 and 2 Notes 1. The 10 programmable bits of N are: b2 to b11. 2. Internal hardware sets: b1 = 0 and b0 = 1. 3. T0, T1 and T2 are bits used for test purposes (see Table 5). 4. P0 is a bit used for controlling the state of the output Port (see Table 6). Table 2 Structure of the dividing number N Notes 1. Bits b2 to b11 are programmable and represent the integer part of the frequency in MHz. Bits b1 and b0 are fixed internally to b1 = 0 and b0 = 1 to get the added 0.25 MHz, common for most TV channels. 2. Bits b1 and b0 are not programmable. 3. fosc = 512b11 + 256b10 + 128b9 + 64b8 + 32b7 + 16b6 + 8b5 + 4b4 + 2b3 + b2 + 0.25 (MHz). Table 3 Dividing number N for programming channel 21 (471.25 MHz) Notes 1. Bits b1 and b0 are not programmable. 2. fosc =0+256 +128 +64+0+16+0+4+2+1+ 0.25 (MHz) = 471.25 MHz. Table 4 Content of the data bytes to program channel 21 (471.25 MHz) It is possible to change only one data byte. The circuit will recognize which one is received with the value of MSB (0 for data byte 1 and 1 for data byte 2). It is possible to change the frequency by 1 MHz with data byte 2. It is easy to increment the channel frequency when its frequency width is 8 MHz by simply incrementing data byte 1. BYTE BIT 7 MSB BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 LSB ACKNOWLEDGE BIT Address byte C8 1 1 0 0 1 0 0 0 ACK Data byte 1 0 b11 b10 b9 b8 b7 b6 b5 ACK Data byte 2 1 T0(3) T1(3) T2(3) P0(4) b4 b3 b2 ACK RESULT BITS(1) b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1(2) b0(2) Frequency (MHz)(3) 512 256 128 64 32 16 8421 0.5 0.25 RESULT BITS b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1(1) b0(1) Value 011101011101 Frequency (MHz)(2) 0 256 128 64 0 16 04210 0.25 BYTE BIT 7 MSB BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 LSB ACKNOWLEDGE BIT Address byte C8 1 1 0 0 1 0 0 0 ACK Data byte 1 0 0 1 1 1 0 1 0 ACK Data byte 2 1 0 0 0 0 1 1 1 ACK |
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