 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
TEA6843 Datasheet(PDF) 9 Page - NXP Semiconductors |
|
||||||||||||||||||||||||||||||
TEA6843 Datasheet(HTML) 9 Page - NXP Semiconductors |
|
|
9 / 62 page  2003 Dec 19 9 Philips Semiconductors Product specification New In Car Entertainment (NICE) extended car radio TEA6843HL 7 FUNCTIONAL DESCRIPTION 7.1 Oscillators 7.1.1 VCO The L and C tuned VCO provides the local oscillator signal for both FM and AM mixer 1. It has a frequency range of 151.2 to 248.2 MHz. 7.1.2 CRYSTAL OSCILLATOR The crystal oscillator provides a 20.5 MHz signal that is used for: • Reference frequency for frequency synthesizer PLL • Local oscillator for AM mixer 2 • Reference frequency for the IF counter • Timing signal for the RDS update algorithm • Reference frequency (75.368 kHz) for the TEA688x (car audio signal processor - CASP) or TEF689x (car radio integrated signal processor - CRISP). 7.1.3 PLL Fast synthesizer PLL tuning system with local control for inaudible RDS updating. 7.2 FM signal channel 7.2.1 DAA FM RF Digital Auto Alignment (DAA) circuitry for the conversion of the VCO tuning voltage to a controlled alignment voltage for the FM antenna tank circuit. 7.2.2 FM I/Q MIXER FM quadrature mixer converts FM RF (65 to 162.55 MHz) to IF of 10.7 MHz. The FM mixer provides inherent image rejection and high RF sensitivity. It is capable of tuning the US FM, US weather, Europe FM, Japan FM and East Europe FM bands: • US FM = 87.9 to 107.9 MHz • US weather FM = 162.4 to 162.55 MHz • Europe FM = 87.5 to 108 MHz • Japan FM = 76 to 91 MHz • East Europe FM = 65.8 to 74 MHz. 7.2.3 FM KEYED AGC The AGC threshold is programmable and the keyed AGC function is switchable via the I2C-bus. If the keyed AGC function is activated, the AGC function is keyed by the narrow band level (IF). The AGC PIN diode drive can be set via the I2C-bus to local function for search tuning. 7.2.4 FM IF AMPLIFIERS The two FM IF amplifiers provide 10 dB and 8.5 dB amplification with high linearity and dynamic range. 7.2.5 FM DEMODULATOR The FM quadrature demodulator includes automatic centre frequency adjustment and THD compensation. 7.2.6 FM MPX SOFT MUTE Muting depth and start of muting are adjustable via the I2C-bus. 7.3 AM signal channel 7.3.1 AM TUNER The AM tuner is realized in a double conversion technique and is capable of selecting LW, MW and SW bands. AM mixer 1 converts AM RF to IF1 of 10.7 MHz, while AM mixer 2 converts IF1 of 10.7 MHz to IF2 of 450 kHz: • LW = 144 to 288 kHz • MW = 522 to 1710 kHz (European and US AM band) • SW = 5.85 to 9.99 MHz (including the 31 m, 41 m and 49 m bands). 7.3.2 AM RF AGC AND IF2 AGC The AM RF includes a PIN diode drive circuit. The threshold detection points for AM AGC are performed at AM mixer 1 and AM IF2. AGC thresholds are programmable at AM mixer 1 input via the I2C-bus. 7.3.3 AM AF OR IF2 SWITCH The AM output provides either a demodulated AM Audio Frequency (AF) or the corresponding AM IF2 signal. The IF2 signal can be used for AM stereo decoder processing. 7.3.4 AM SOFT MUTE The AM detector output is either not muted or signal strength dependent soft muted audio. The soft mute function can be switched off via the I2C-bus. |
Similar Part No. - TEA6843 |
|
Similar Description - TEA6843 |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List 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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
