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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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MC1495P Scheda tecnica(PDF) 10 Page - ON Semiconductor |
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MC1495P Scheda tecnica(HTML) 10 Page - ON Semiconductor |
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10 / 16 page  MC1495 http://onsemi.com 10 Referring to Figure 21, the level shift components will be determined. When VX = VY = 0, the currents I2 and I14 will be equal to I13. In Step 3, RL was found to be 20 kΩ and in Step 4, V2 and V14 were found to be approximately 11 V. From this information RO can be found easily from the following equation (neglecting the operational amplifiers bias current): V2 RL + I13 = V+ –V2 RO And for this example, 11 V 20 k Ω+ 1.0 mA = 15 V –11 V RO Solving for RO: RO = 2.6 kΩ, thus, select RO = 3.0 kΩ For RO = 3.0 kΩ, the voltage at Pins 2 and 14 is calculated to be: V2 = V14 = 10.4 V. The linearity of this circuit (Figure 21) is likely to be as good or better than the circuit of Figure 5. Further improvements are possible as shown in Figure 23 where RY has been increased substantially to improve the Y linearity, and RX decreased somewhat so as not to materially affect the X linearity. This avoids increasing RL significantly in order to maintain a K of 0.1. The versatility of the MC1495 allows the user to to optimize its performance for various input and output signal levels. OFFSET AND SCALE FACTOR ADJUSTMENT Offset Voltages Within the monolithic multiplier (Figure 3) transistor base- emitter junctions are typically matched within 1.0 mV and resistors are typically matched within 2%. Even with this careful matching, an output error can occur. This output error is comprised of X-input offset voltage, Y-input offset voltage, and output offset voltage. These errors can be adjusted to zero with the techniques shown in Figure 21. Offset terms can be shown analytically by the transfer function: VO = K[Vx ± Viox ± Vx(off)] [Vy ± Vioy ± Vy(off)] ± VOO (1) Where: K = scale factor Vx = ‘‘x’’ input voltage Vy = ‘‘y’’ input voltage Viox = ‘‘x’’ input offset voltage Vioy = ‘‘y’’ input offset voltage Vx(off) = ‘‘x’’ input offset adjust voltage Vy(off) = ‘‘y’’ input offset adjust voltage VOO = output offset voltage. Figure 23. Multiplier with Improved Linearity 5 7.5 k 27 k 11 10 33 k 10 k Output Offset Adjust 20 k 12 k 4 9 13 8 12 2 14 - + + + 10 k VY′ VX′ MC1495 MC1741C 20 k 15 k -15 V +15 V 2.0 k 2 3 7 4 6 5 1 + - 40 k +15 V 3.0 k 3.0 k 3.0 k 1 7 - 15 V - 15 V 3 10 k 10 k 10 k 6 15 k Y Offset Adjust Scale Factor Adjust ±10 V VO = -VX VY 10 X Offset Adjust 2.0 k 13 k 5.0 k |
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