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LMH6703MFX Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LMH6703MFX Datasheet(HTML) 11 Page - National Semiconductor (TI) |
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11 / 13 page  Application Section (Continued) VIDEO PERFORMANCE The LMH6703 has been designed to provide excellent per- formance with production quality video signals in a wide variety of formats such as HDTV and High Resolution VGA. NTSC and PAL performance is nearly flawless with DG of 0.01% and DP of 0.02˚. Best performance will be obtained with back terminated loads. The back termination reduces reflections from the transmission line and effectively masks transmission line and other parasitic capacitance from the amplifier output stage. Figure 5 shows a typical configuration for driving 75 Ω cable. The amplifier is configured for a gain of two compensating for the 6 dB loss due to R OUT. ENABLE/DISABLE For ±5V supplies only the LMH6703 has a TTL logic com- patible disable function. Apply a logic low (<.8V) to the SD pin and the LMH6703 is disabled. Apply a logic high (>2.0V), or let the pin float and the LMH6703 is enabled. Voltage, not current, at the Shutdown pin (SD) determines the enable/ disable state. Care must be exercised to prevent the shut- down pin voltage from going more than 0.8V below the midpoint of the supply voltages (0V with split supplies, V +/2 with single supply biasing). Doing so could cause transistor Q1 to Zener resulting in damage to the disable circuit (See Figure 6). The core amplifier is unaffected by this, but the shutdown operation could become permanently slower as a result. Disabled, the LMH6703 inputs and output become high im- pedances. While disabled the LMH6703 quiescent current is approximately 200 µA. Because of the pull up resistor on the shutdown circuit, the I CC and IEE currents (positive and negative supply currents respectively) are not balanced in the disabled state. The positive supply current (I CC)isap- proximately 300 µA while the negative supply current (I EE)is only 200 µA. The remaining I EE current of 100 µA flows through the shutdown pin. The disable function can be used to create analog switches or multiplexers. Implement a single analog switch with one LMH6703 positioned between an input and output. Create an analog multiplexer with several LMH6703’s and tie the outputs together. 20110633 FIGURE 5. Typical Video Application 20110637 FIGURE 6. SD Pin Simplified Schematic (SOT23 Pinout Shown) www.national.com 11 |
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