поискавой системы для электроныых деталей |
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SI4701-EVB датащи(PDF) 6 Page - Silicon Laboratories |
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SI4701-EVB датащи(HTML) 6 Page - Silicon Laboratories |
6 / 44 page Si4700/01/02/03-EVB 6 Rev. 0.9 Figure 2. Power Configuration 3.1.4. Expansion I/O connector The 20-pin Expansion I/O connector J3 provides access to all the control signals of the Si4700/01/02/03 including the general purpose input/output pins. Pins for the VA, VD, VIO, and RCLK pins of the Si4700/01/02/03 are also available. All test points on J3 are labeled indicating the signal available at the pin. Note: The unlabeled pins on J3 between (a) SCLK and RST, and (b) RCLK and GPIO1, provide access to the system ground. 3.2. Si4700/01/02/03 Daughter Card 3.2.1. Si4700/01/02/03 FM Tuner Chip The Si4700/01/02/03 (U1) and its bypass capacitors* are located on the daughter card. The Si4700/01/02/03 is configured to accept a single-ended FM input—the FMIN pin is grounded and the FMIP pin is connected to J1 through an ac-coupling capacitor. FMIP is also connected to the ground wire of the headphone jack (J3) for easy testing of a headphone wire as the antenna. Refer to “AN231: Si4700/01 Headphone and Antenna Interface” for more information. *Note: We recommend a single bypass capacitor on VD. To account for various supply designs and layouts, we recommend that customers make provisions for bypass capacitors at all supply pins. 3.2.2. Audio Amplifier The daughter card includes a high-output drive dual op- amp chip (U2—daughter card) to buffer the audio outputs at the LOUT and ROUT pins of the Si4700/01/02/03. The LOUT and ROUT pins are also ac-coupled to the inputs of the op-amps on U4 - daughter card. To drive the headphone jack, the op- amps are connected in a unity-gain, noninverting configuration and biased at the middle of the audio power supply. The outputs of the U2 op-amps are in turn ac-coupled to the BNC connectors J10 and J11 on the baseboard. The audio amplification network has been designed to drive resistances of 10 k which is easily achievable on most audio analyzers. The op-amps have enough drive capability to drive resistances much lower than 10 k (e.g. 32 headphones). In such cases, however, the lower end of the audio spectrum (up to 2.5 kHz) will be attenuated. This is because the 3-dB points of the high- pass filters at the outputs of the op-amps move to higher frequencies as the output resistance is decreased. Also note that the op-amps are not protected against extended short-circuit conditions. Hence, the audio outputs at J10 and J11 should not be connected to a mono input if the Si4700/01/02/03 is configured to produce a stereo output. R1 R2 R4 U3 U6 VAUDIO VMCU/VIO USB R30 NF U2 VRADIO R14 0 ohm R25 NF J4 J1 J7 SW1 USB POWER EXT POWER |
Аналогичный номер детали - SI4701-EVB |
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Аналогичное описание - SI4701-EVB |
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