전자부품 데이터시트 검색엔진 |
|
TDA8822M 데이터시트(PDF) 8 Page - NXP Semiconductors |
|
TDA8822M 데이터시트(HTML) 8 Page - NXP Semiconductors |
8 / 28 page 1997 Jan 08 8 Philips Semiconductors Preliminary specification Universal I2C-bus programmable RF modulator TDA8822 Table 4 Picture-to-sound ratio setting (typical values) PS SETTING BIT P/S RATIO (dB) PS2 PS1 PS0 0 000 −11 1 001 −12 2 010 −13 3 011 −14 4 100 −15 5 101 −16 6 110 −17 7 111 −18 RF part The RF part provides the following: • The RF oscillator can produce any frequency used for TV transmission, from 35 to 890 MHz. The frequency range depends on the components used in the application (see Table 11). • The RF mixer combines the video signal, the sound subcarrier and the carrier from the NICAM input to build a baseband TV channel. This baseband signal is then mixed with the RF oscillator signal to get the RF TV channel. • The two signals from the RF mixer are sent to the output buffer. This output buffer can be used either as two asymmetrical outputs or as one symmetrical output. • The output buffer is switched-off while the PLL is not in-lock, to avoid parasitic output signal during the tuning of the RF oscillator. The in-lock information is given by the phase detector of the loop. • The signal from the RF oscillator is fed to the PLL which controls the picture carrier frequency. The RF signal is first divided by 8 in the prescaler, and then divided in the programmable 14-bits divider. The dividing ratio of this divider is programmed via the I2C-bus. The minimum frequency that can be synthesized is 16 MHz, and the maximum frequency is 1023.9375 MHz. • The divided frequency called fdiv(video) is compared to the reference frequency called fref(video) coming from the crystal oscillator and divided in the reference divider. The crystal oscillator is intended to be used with a crystal of 4 MHz. • The comparison between fref(video) and fdiv(video) is done in the video phase detector. The resulting signal is fed via the video charge pump to the loop amplifier, including the tuning voltage drive (33 V) inside the IC. • fref(video) and fdiv(video) can also be monitored on the output port during a special test mode. • The I2C-bus receiver and control logic includes the control of: – Picture carrier frequency – Sound subcarrier frequency – Sound subcarrier frequency deviation – Video modulation depth – Picture-to-sound ratio – TPSG on/off and LED drive control – RF oscillator on/off – Sound oscillator on/off – General purpose output port on/off – Test modes setting. Software information The transmission is made using 4 words in I2C-bus format. First the address CA has to be sent, then at least two consecutive words have to be sent, either the two words F1 and F0, or the two words C1 and C0. The two words C1 and F1 are differentiated inside the IC by the first bit being logic 1 or logic 0 respectively. The contents of the 4 bytes is shown in Table 5. At the power-up of the TDA8822, the I2C-bus state is the following: • N13 to N0 are not fixed • SC setting = 1: the sound carrier is fixed to 5.5 MHz • MD is set to 4 (82.5%), PS is set to 1 (−12 dB) and DEV is set to 2 (50.5%) |
유사한 부품 번호 - TDA8822M |
|
유사한 설명 - TDA8822M |
|
|
링크 URL |
개인정보취급방침 |
ALLDATASHEET.CO.KR |
ALLDATASHEET 가 귀하에 도움이 되셨나요? [ DONATE ] |
Alldatasheet는? | 광고문의 | 운영자에게 연락하기 | 개인정보취급방침 | 링크교환 | 제조사별 검색 All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |