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TDA7706 数据表(PDF) 10 Page - STMicroelectronics |
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TDA7706 数据表(HTML) 10 Page - STMicroelectronics |
10 / 16 page Function description TDA7706 10/16 Doc ID 022898 Rev 3 2.6 IF A/D converters A high performance IQ-IFADC converts the IF signal to the digital domain for subsequent digital signal processing. Two fully differential, continuous-time Sigma-Delta ( ) IF-ADCs are used for both the'I' path and the 'Q' path. For each IFADC, two fully differential input nodes are fed with an input signal having a bandwidth up to 325 kHz. This fully differential design provides good suppression of even-order harmonics. For complex filtering, the input signals of the 'I' path and the 'Q' path have a 90 degree phase shift. The IFADC sampling frequency is 36.48 MHz. 2.7 Audio D/A converters A CD-quality (>100dB DR) stereo DAC provides the left/right audio signals after IF processing and stereo-decoding by the DSP. In presence of an external HD Radio decoder the DAC outputs the high quality audio resulting from the decoding of the HD Radio transmissions. 2.8 VCO The VCO is fully integrated without any external tuning component. It covers all the FM frequency bands including EU, US, Japan, East-Europe, Weather-Band and the AM-bands including LW, MW and SW. Its center frequency is approximately 2.7 GHz. 2.9 PLL 2.9.1 Tuner PLL The very high-speed tuning PLL is able to settle within about 100 µs for fast RDS applications. The frequency step can be as low as 5 kHz in FM and 500 Hz in AM. 2.10 Crystal oscillator The device works with a 36.48 MHz fundamental tone crystal. The oscillator block diagram is shown in Figure 3. On the PCB the crystal must be connected as close as possible to the chip oscillator input and output pins of the chip. The internal load capacitance together with pin and pad capacitance is optimized for fundamental tone crystal units at 36.48MHz. It is not recommended to put any additional external load capacitors. By suitably configuring pin #9 (CK_SEL), the device can be operated as either a clock master or a clock slave. If pin 9 is left open or tied to GND, the device is configured as clock master (typical operation mode). In case the device is configured as clock slave, pin 9 needs to be connected to 5V. Then the crystal oscillator is switched off and the device expects a crystal equivalent signal on the OSCout/OSCin pins. |
类似零件编号 - TDA7706 |
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类似说明 - TDA7706 |
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