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MPY100A Datasheet(PDF) 8 Page - Burr-Brown (TI) |
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MPY100A Datasheet(HTML) 8 Page - Burr-Brown (TI) |
8 / 12 page ® MPY100 8 IX = VX/RX and IY = VY/RY Analysis of Figure 4 shows the voltage VA to be: VA = (2RL/I1)(IXIY) Since IX and IY are linearly related to the input voltages VX and VY, VA may also be written: VA = KVXVY where K is a scale factor. In the MPY100, K is chosen to be 0.1. The addition of the Z input alters the voltage VA to: VA = KVXVY – VZ Therefore, the output of the MPY100 is: VO = A[KVXVY – VZ] where A is the open-loop gain of the output amplifier. Writing this last equation in terms of the separate inputs to the MPY100 gives VO = A – (Z1 – Z2) the transfer function of the MPY100. WIRING PRECAUTIONS In order to prevent frequency instability due to lead induc- tance of the power supply lines, each power supply should be bypassed. This should be done by connecting a 10 µF tantalum capacitor in parallel with a 1000pF ceramic capaci- tor from the +VCC and –VCC pins of the MPY100 to the power supply common. The connection of these capacitors should be as close to the MPY100 as practical. (X 1 – X2)(Y1 – Y2) 10 FIGURE 4. MPY100 Simplified Circuit Diagram. Q 8 Q 7 + R X 2 21 1 R X 2 V X – X 2 –V CC Q 6 Q 5 + R Y 2 21 1 R Y 2 V Y – Q 10 Q 9 + R Z 2 21 1 R Z 2 V Z – Y 2 Z 2 R CM Q 2 Q 1 I 2 I 1 Q 4 Q 3 I 4 I 3 A D 1 D 2 +V CC R L R L + V 1 – + V A – Y 1 X 1 Z 1 V O Out CAPACITIVE LOADS Stable operation is maintained with capacitive loads to 1000pF in all modes, except the square root mode for which 50pF is a safe upper limit. Higher capacitive loads can be driven if a 100 Ω resistor is connected in series with the MPY100’s output. DEFINITIONS TOTAL ERROR (Accuracy) Total error is the actual departure of the multiplier output voltage form the ideal product of its input voltages. It includes the sum of the effects of input and output DC offsets, gain error and nonlinearity. OUTPUT OFFSET Output offset is the output voltage when both inputs VX and VY are 0V. SCALE FACTOR ERROR Scale factor error is the difference between the actual scale factor and the ideal scale factor. NONLINEARITY Nonlinearity is the maximum deviation from a best straightline (curve fitting on input-output graph) expressed as a percent of peak-to-peak full scale output. FEEDTHROUGH Feedthrough is the signal at the output for any value of VX or VY within the rated range, when the other input is zero. |
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