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LT1794 Datasheet(PDF) 7 Page - Linear Technology |
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LT1794 Datasheet(HTML) 7 Page - Linear Technology |
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7 / 20 page  7 LT1794 9 2 8 –12V 1k 12V 3 19 10 (SHDN) RSHDN 4 5 6 7 110 Ω OUT (+) OUT (–) 10k EIN 0.01 µF RL ≈ 50Ω 1:2* 10k 49.9 Ω 110 Ω 12.7 Ω 1794 TC 14 15 16 17 18 11 (SHDNREF) – + A 13 12 1k 0.1 µF 4.7 µF 0.1 µF 12V –12V – + B –12V 12.7 Ω VOUT(P-P) 100 LINE LOAD SUPPLY BYPASSING *COILCRAFT X8390-A OR EQUIVALENT VOUTP-P AMPLITUDE SET AT EACH AMPLIFIER OUTPUT DISTORTION MEASURED ACROSS LINE LOAD SPLITTER MINICIRCUITS ZSC5-2-2 + + 4.7 µF + 0.1 µF 4.7 µF TEST CIRCUIT APPLICATIO S I FOR ATIO The LT1794 is a high speed, 200MHz gain bandwidth product, dual voltage feedback amplifier with high output current drive capability, 500mA source and sink. The LT1794 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 LT1794 also allows for an adjustment of the operating current to minimize power consumption. In addition, the LT1794 is available in small footprint surface mount packages to minimize PCB area in multiport central office DSL cards. To minimize signal distortion, the LT1794 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 pro- vided to control quiescent power consumption and allow for the complete shutdown of the driver. 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 LT1794 is to set the quiescent current to 10mA per amplifier. 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 |
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