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MPY634SM Datasheet(PDF) 7 Page - Burr-Brown (TI) |
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MPY634SM Datasheet(HTML) 7 Page - Burr-Brown (TI) |
7 / 8 page ® MPY634 7 respectively. Feedback is applied to the Y2 input, and Y1 is normally referenced to output ground. Alternatively, as the transfer function implies, an input applied to Y1 can be summed directly into VOUT. Since the feedback connection is made to a multiplying input, the effective gain of the output op amp varies as a function of the denominator input voltage. Therefore, the bandwidth of the divider function is proportional to the denominator voltage (see Typical Perfor- mance Curves). FIGURE 5. Square-Rooter Connection. APPLICATIONS FIGURE 6. Phase Detector. FIGURE 7. Voltage-Controlled Amplifier. MPY634 X 1 +V S X 2 Out SF Z 1 Y 1 Z 2 Y 2 –V S –15V +15V V O = (AB/20) cos 0.1µF R X A sin (2 π 10MHz t) B sin (2 π 10MHz t + ) Multiplier connection followed by a low-pass filter forms phase detector useful in phase-locked-loop circuitry. R X is often used in PLL circuitry to provide desired loop-damping characteristics. 1k Ω θ θ MPY634 X 1 +V S X 2 Out SF Z 1 Y 1 Z 2 Y 2 –V S –15V +15V Z Input 10V FS 12V PK V OUT = 10V(Z 2 – Z1) + X2 Output, ±12V PK R L (Must be Provided) Reverse this and X inputs for Negative Outputs Optional Summing Input, X, ±10V PK FIGURE 4. Basic Divider Connection. Accuracy of the divider mode typically ranges from 1.0% to 2.5% for a 10 to 1 denominator range depending on device grade. Accuracy is primarily limited by input offset voltages and can be significantly improved by trimming the offset of the X input. A trim voltage of ±3.5mV applied to the “low side” X input (X2 for positive input voltages on X1) can produce similar accuracies over 100 to 1 denominator range. To trim, apply a signal which varies from 100mV to 10V at a low frequency (less than 500Hz). An offset sine wave or ramp is suitable. Since the ratio of the quantities should be constant, the ideal output would be a constant 10V. Using AC coupling on an oscilloscope, adjust the offset control for minimum output voltage variation. SQUARE-ROOTER A square-rooter connection is shown in Figure 5. Input voltage is limited to one polarity (positive for the connection shown). The diode prevents circuit latch-up should the input go negative. The circuit can be configured for negative input and positive output by reversing the polarity of both the X and Y inputs. The output polarity can be reversed by revers- ing the diode and X input polarity. A load resistance of approximately 10k Ω must be provided. Trimming for im- proved accuracy would be accomplished at the Z input. MPY634 X 1 +V S X 2 V O SF Z 1 Y 1 Z 2 Y 2 –V S –15V +15V OPA606 1k Ω Minor gain adjustments are accomplished with the 1k Ω variable resistor connected to the scale factor adjustment pin, SF. Bandwidth of this circuit is limited by A 1, which is operated at relatively high gain. A 1 39k Ω 2k Ω 2k Ω + – E S + – E C –15V V O = 10 • EC • ES MPY634 X 1 +V S X 2 Out SF Z 1 Y 1 Z 2 Y 2 –V S –15V +15V Optional Summing Input ±10V PK X Input (Denominator) 0.1V ≤ X ≤ 10V Z Input (Numerator) ±10V FS, ±12V PK + – (X 1 – X2) V OUT = + Y 1 10V(Z 2 – Z1) Output, ±12V PK |
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