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AFE1104 Datasheet(PDF) 7 Page - Burr-Brown (TI) |
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AFE1104 Datasheet(HTML) 7 Page - Burr-Brown (TI) |
7 / 10 page ® AFE1104 7 FIGURE 2. Basic Connection Diagram. rxHYB AND rxLINE INPUT ANTI-ALIASING FILTERS The –3dB frequency of the input anti-aliasing filter for the rxLINE and rxHYB differential inputs should be about 1MHz. Suggested values for the filter are 750 Ω for each of the two input resistors and 100pF for the capacitor. Together the two 750 Ω resistors and the 100pF capacitor result in a –3dB frequency of just over 1MHz. The 750 Ω input resis- tors will result in a minimal voltage divider loss with the input impedance of the AFE1104. This circuit applies at both T1 and E1 rates. For slower rates, the antialiasing filters will give best performance with their –3dB frequency approximately equal to the bit rate. For example, a –3dB frequency of 500kHz should be used for a single pair bit rate of 500kbps. rxHYB AND rxLINE INPUT BIAS VOLTAGE The transmitter output on the txLINE pins is centered at midscale, 2.5V. But, the rxLINE input signal is centered at 1.5V in the circuit shown in Figure 2 above. Inside the AFE1104, the rxHYB and rxLINE signals are subtracted as described in the paragraph on echo cancella- tion above. This means that the rxHYB inputs need to be centered at 1.5V just as the rxLINE signal is centered at 1.5V. REFN (Pin 36) is a 1.5V voltage source. The external compromise hybrid must be designed so that the signal into the rxHYB inputs is centered at 1.5V. PLL OUT REF P V CM REF N DV DD PV DD AV DD AFE1104 AV DD AV DD PLL IN txDAT txCLK rxSYNC rxCLK rxLOOP rxGAIN1 rxGAIN0 rxD13 - rxD0 DAC+ TX_SYM_CLK HOLD_ MCLK19_2 AD13 - AD0 SPAROW AGND PGND DGND AGND AGND AGND txLINE P txLINE N rxHYB P rxHYB N rxLINE N rxLINE P 1k Ω 200 Ω 0.1µF 0.01µF Neg Neg Pos Pos 750 Ω 13 Ω 13 Ω 750 Ω 750 Ω 750 Ω 100pF 100pF Compromise Hybrid 0.01µF 5V Analog 0.1µF 0.1µF 10µF 0.1µF 0.1µF 0.1µF 1 - 10µF + 5V to 3.3V Digital 5 - 10 Ω resistor for isolation Input antialias filter f C ≅ 1MHz 1:2 Transformer Tip Ring 0.1µF 0.1µF 0.1µF 2k Ω 2k Ω REF N 2k Ω 2k Ω REF N 0.1µF 0.1µF 0.1µF 0.1µF 14 |
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