 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
TEF6862 Datasheet(PDF) 9 Page - NXP Semiconductors |
|
||||||||||||||||||||||||||||||
TEF6862 Datasheet(HTML) 9 Page - NXP Semiconductors |
|
|
9 / 65 page  TEF6862_1 © Koninklijke Philips Electronics N.V. 2006. All rights reserved. Product data sheet Rev. 01 — 14 September 2006 9 of 65 Philips Semiconductors TEF6862 Car Radio Enhanced Selectivity Tuner (CREST) These dividers generate in-phase and quadrature-phase output signals used in the FM front-end mixer for image rejection. In AM mode the LO frequency is divided by 6, 8, 10, 16 or 20 depending on the selected AM band. 7.12 Crystal oscillator The linear crystal oscillator provides a 20.5 MHz signal. A divider-by-two generates in-phase and quadrature-phase mixer frequencies for the conversion from IF1 to IF2 including image rejection. The reference divider generates from the crystal frequency various reference frequencies for the tuning PLL. Also the different timing signals for the sequential machine as well as the analog signal processor reference frequency are derived from the crystal reference. 7.13 Tuning PLL The tuning PLL locks the VCO frequency divided by the programmable divider ratio to the reference frequency. Due to the combination of different charge pump signals in the PLL loop filter, the loop parameters are adapted dynamically. Tuning to different radio frequencies is done by changing the programmable divider ratio. The tuning step size is selected with the reference frequency divider setting. 7.14 Antenna DAA The antenna DAA measures the VCO tuning voltage and multiplies it with a factor defined by the 7-bit DAA1 setting to generate a tuning voltage for the FM antenna tank circuit. A second tuning voltage (DAA output 2) for an optional second FM tank circuit is derived from the first tuning voltage with 4 bits. 7.15 AM RF AGC The AM front-end is designed for the application of an external JFET low noise amplifier with cascode AGC and PIN diode AGC both controlled by an integrated AGC circuit. Four AGC thresholds of the detector at the first mixer input are selectable via I2C-bus. A further detector at the IF AGC input prevents undesired overload (see Figure 21). AGC information can be read out via I2C-bus. The PIN diode current drive circuit includes a pull-up current source for reverse biasing of the PIN diode, when the AGC is not active to achieve a low parasitic capacitance. 7.16 AM mixer The large dynamic range AM mixer converts AM RF (144 kHz to 26.1 MHz) to an IF of 10.7 MHz. 7.17 AM IF noise blanker The spike detection for the AM noise blanker is at the output of the AM front-end mixer. Blanking is realized at the output of the second AM mixer. The sensitivity of the noise blanker can be set in three settings and switched off via I2C-bus. |
Similar Part No. - TEF6862_15 |
|
Similar Description - TEF6862_15 |
|
|
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
