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HA9P2556-9Z Datasheet(PDF) 8 Page - Intersil Corporation |
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HA9P2556-9Z Datasheet(HTML) 8 Page - Intersil Corporation |
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8 / 18 page  8 FN2477.6 April 29, 2008 Each input X, Y and Z have similar wide bandwidth and input characteristics. This is unlike earlier products where one input was dedicated to a slow moving control function as is required for Automatic Gain Control. The HA-2556 is versatile enough for both. Although the X and Y inputs have similar AC characteristics, they are not the same. The designer should consider input parameters such as small signal bandwidth, AC feedthrough and 0.1dB gain flatness to get the most performance from the HA-2556. The Y-Channel is the faster of the two inputs with a small signal bandwidth of typically 57MHz vs 52MHz for the X-Channel. Therefore in AM Signal Generation, the best performance will be obtained with the Carrier applied to the Y-Channel and the modulation signal (lower frequency) applied to the X-Channel. Scale Factor Control The HA-2556 is able to operate over a wide supply voltage range ±5V to ±17.5V. The ±5V range is particularly useful in video applications. At ±5V the input voltage range is reduced to ±1.4V. The output cannot reach its full scale value with this restricted input, so it may become necessary to modify the scale factor. Adjusting the scale factor may also be useful when the input signal itself is restricted to a small portion of the full scale level. Here, we can make use of the high gain output amplifier by adding external gain resistors. Generating the maximum output possible for a given input signal will improve the Signal-to-Noise Ratio and Dynamic Range of the system. For example, let’s assume that the input signals are 1VPEAK each then, the maximum output for the HA-2556 will be 200mV. (1V x 1V)/(5V) = 200mV. It would be nice to have the output at the same full scale as our input, so let’s add a gain of 5 as shown in Figure 9. One caveat is that the output bandwidth will also drop by this factor of 5. The multiplier equation then becomes Equation 15: Current Output Another useful circuit for low voltage applications allows the user to convert the voltage output of the HA2556 to an output current. The HA-2557 is a current output version offering 100MHz of bandwidth, but its scale factor is fixed and does not have an output amplifier for additional scaling. Fortunately, the circuit in Figure 10 provides an output current that can be scaled with the value of RCONVERT and provides an output impedance of typically 1M Ω. IOUT then becomes Equation 16: Video Fader The Video Fader circuit provides a unique function. Here Channel B is applied to the minus Z input in addition to the minus Y input. In this way, the function in Figure 11 is generated. VMIX will control the percentage of Channel A and Channel B that are mixed together to produce a resulting video image or other signal. The Balance equation looks like Equation 17: Which simplifies to Equation 18: When VMIX is 0V the equation becomes VOUT = ChB and ChA is removed, conversely when VMIX is 5V the equation becomes VOUT = ChA eliminating ChB. For VMIX values 0V ≤ V MIX ≤ 5V the output is a blend of ChA and ChB. Other Applications As previously shown, a function may contain several different operators at the same time and use only one HA-2556 1/5V X Y VOUT Z VX+ VX- VY+ VY- VZ+ VZ- ∑ W A B 1k Ω 250 Ω RF RG ExternalGain R F R G -------- 1 + = + - + - A + - + - FIGURE 9. EXTERNAL GAIN OF 5 W 5AB 5 ------------ AB × == (EQ. 15) I OUT AB × 5 -------------- 1 R CONVERT -------------------------------- × = (EQ. 16) HA-2556 1/5V X Y VOUT Z VX+ VX- VY+ VY- VZ+ VZ- ∑ IOUT A B RCONVERT + - + - A + - + - FIGURE 10. CURRENT OUTPUT V MIX () ChA ChB – () × 5V OUT ChB – () = (EQ. 17) V OUT ChB V MIX 5 -------------- ChA ChB – () + = (EQ. 18) NC NC VY+ -15V VOUT +15V VX + NC NC 50 Ω NC NC VZ- VZ+ ChA ChB VY- VMIX (0V TO 5V) 14 15 16 9 13 12 11 10 1 2 3 4 5 7 6 8 Σ + - REF + - + - + - FIGURE 11. VIDEO FADER HA-2556 |
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Similar Description - HA9P2556-9Z |
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