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STDVE003A Datasheet(PDF) 11 Page - STMicroelectronics |
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STDVE003A Datasheet(HTML) 11 Page - STMicroelectronics |
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11 / 41 page  STDVE003A Functional description 11/41 Figure 6. STDVE003A gain vs. frequency The STDVE003A equalizer is fully adaptive and automatic in function. The default setting of EQ_BOOST = L is recommended for optimal operation. The equalizer’s performance is optimized for all frequencies over the cable lengths from 1 m to 25 m at EQ_BOOST = L. If cable lengths greater than 25 m are desired in application, then EQ_BOOST = H setting is recommended. Input termination The STDVE003A integrates precise 50 Ω ± 5% termination resistors, pulled up to VCC, on all its differential input channels. External terminations are not required. This gives better performance and also minimizes the PCB board space. These on-chip termination resistors should match the differential characteristic impedance of the transmission line. Since the output driver consists of current steering devices, an output voltage is not generated without a termination resistor. Output voltage levels are dependent on the value of the total termination resistance. The STDVE003A produces TMDS output levels for point-to-point links that are doubly terminated (100 Ω at each end). With the typical 10 mA output current, the STDVE003A produces an output voltage of 3.3 – 0.5 V = 2.8 V when driving a termination line terminated at each end. The input terminations are selectable thus saving power for the unselected ports. Output buffers Each differential output of the STDVE003A drives external 50 Ω load (pull-up resistor) and conforms to the TMDS voltage standard. The output drivers consist of 10 mA differential current-steering devices. The driver outputs are short-circuit current limited and are high-impedance to ground when OE_N = H or the device is not powered. The current steering architecture requires a resistive load to terminate the signal to complete the transmission loop from VCC to GND through the termination resistor. Because the device switches the direction of the current flow and not voltage levels, the output voltage swing is determined by VCC minus the voltage drop across the termination resistor. The output current drivers are controlled by the OE_N pin and are turned off when OE_N is a high. A stable 10 mA current is derived by accurate internal current mirrors of a stable reference current which is generated by band-gap voltage |
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