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LT6301 Datasheet(PDF) 7 Page - Linear Technology |
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LT6301 Datasheet(HTML) 7 Page - Linear Technology |
7 / 16 page 7 LT6301 sn6301 6301f APPLICATIO S I FOR ATIO The LT6301 is a high speed, 200MHz gain bandwidth product, quad voltage feedback amplifier with high output current drive capability, 500mA source and sink. The LT6301 is ideal for use as a line driver in xDSL data communication applications. The output voltage swing has been optimized to provide sufficient headroom when operating from ±12V power supplies in full-rate ADSL applications. The LT6301 also allows for an adjustment of the operating current to minimize power consumption. In addition, the LT6301 is available in a small footprint surface mount package to minimize PCB area. To minimize signal distortion, the LT6301 amplifiers are decompensated to provide very high open-loop gain at high frequency. As a result each amplifier is frequency stable with a closed-loop gain of 10 or more. If a closed- loop gain of less than 10 is desired, external frequency compensating components can be used. Setting the Quiescent Operating Current Power consumption and dissipation are critical concerns in multiport xDSL applications. Two pins, Shutdown (SHDN) and Shutdown Reference (SHDNREF), are provided to control quiescent power consumption and allow for the complete shutdown of the drivers. The quiescent current should be set high enough to prevent distortion induced errors in a particular application, but not so high that power is wasted in the driver unnecessarily. A good starting point to evaluate the LT6301 is to set the quiescent current to 10mA per amplifier. Pins 4 and 5 set the current for ampli- fiers A and B and Pins 10 and 11 set the current for amplifers C and D. Each amplifier pair should be controlled separately. The internal biasing circuitry is shown in Figure 1. Ground- ing the SHDNREF pin and directly driving the SHDN pin with a voltage can control the operating current as seen in the Typical Performance Characteristics. When the SHDN pin is less than SHDNREF + 0.4V, the driver is shut down and consumes typically only 100 µA of supply current and the outputs are in a high impedance state. Part to part varia- tions, however, will cause inconsistent control of the qui- escent current if direct voltage drive of the SHDN pin is used. Using an external resistor, RBIAS, connected in one of two ways provides a much more predictable control of the quiescent supply current. Figure 2 illustrates the effect on supply current per amplifier with RBIAS connected be- tween the SHDN pin and the 12V V+ supply of the LT6301 and the approximate design equations. Figure 3 illustrates the same control with RBIAS connected between the SHDNREF pin and ground while the SHDN pin is tied to V+. Either approach is equally effective. Figure 1. Internal Current Biasing Circuitry 2k SHDN SHDNREF TO START-UP CIRCUITRY 1k 6301 F01 IBIAS TO AMPLIFIERS BIAS CIRCUITRY 2I I 2I 5I 2 5 IBIAS = ISUPPLY PER AMPLIFIER (mA) = 64 • IBIAS ISHDN = ISHDNREF RBIAS (kΩ) 0 10 20 30 5 15 25 10 6301 F02 7 40 70 100 130 160 190 VS = ±12V V+ = 12V RBIAS SHDN SHDNREF RBIAS = • 25.6 – 2k V+ – 1.2V IS PER AMPLIFIER (mA) IS PER AMPLIFIER (mA) • 25.6 V+ – 1.2V RBIAS + 2k ≈ Figure 2. RBIAS to V+ Current Control |
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