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MC1495P Datasheet(PDF) 11 Page - ON Semiconductor |
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MC1495P Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 16 page MC1495 http://onsemi.com 11 X, Y and Output Offset Voltages VO Output Offset Vx X Offset Y Offset Vy Output Offset VO For most dc applications, all three offset adjust potentiometers (P1, P2, P4) will be necessary. One or more offset adjust potentiometers can be eliminated for ac applications (see Figures 28, 29, 30, 31). If well regulated supply voltages are available, the offset adjust circuit of Figure 13 is recommended. Otherwise, the circuit of Figure 14 will greatly reduce the sensitivity to power supply changes. Scale Factor The scale factor K is set by P3 (Figure 21). P3 varies I3 which inversely controls the scale factor K. It should be noted that current I3 is one-half the current through R1. R1 sets the bias level for Q5, Q6, Q7, and Q8 (see Figure 3). Therefore, to be sure that these devices remain active under all conditions of input and output swing, care should be exercised in adjusting P3 over wide voltage ranges (see General Design Procedure). Adjustment Procedures The following adjustment procedure should be used to null the offsets and set the scale factor for the multiply mode of operation, (see Figure 21). 1. X-Input Offset (a) Connect oscillator (1.0 kHz, 5.0 Vpp sinewave) to the Y-input (Pin 4). (b) Connect X-input (Pin 9) to ground. (c) Adjust X offset potentiometer (P2) for an ac null at the output. 2. Y-Input Offset (a) Connect oscillator (1.0 kHz, 5.0 Vpp sinewave) to the X-input (Pin 9). (b) Connect Y-input (Pin 4) to ground. (c) Adjust Y offset potentiometer (P1) for an ac null at the output. 3. Output Offset (a) Connect both X and Y-inputs to ground. (b) Adjust output offset potentiometer (P4) until the output voltage (VO) is 0 Vdc. 4. Scale Factor (a) Apply +10 Vdc to both the X and Y-inputs. (b) Adjust P3 to achieve + 10 V at the output. 5. Repeat steps 1 through 4 as necessary. The ability to accurately adjust the MC1495 depends upon the characteristics of potentiometers P1 through P4. Multi-turn, infinite resolution potentiometers with low temperature coefficients are recommended. DC APPLICATIONS Multiply The circuit shown in Figure 21 may be used to multiply signals from dc to 100 kHz. Input levels to the actual multiplier are 5.0 V (max). With resistive voltage dividers the maximum could be very large however, for this application two-to-one dividers have been used so that the maximum input level is 10 V. The maximum output level has also been designed for 10 V (max). Squaring Circuit If the two inputs are tied together, the resultant function is squaring; that is VO = KV2 where K is the scale factor. Note that all error terms can be eliminated with only three adjustment potentiometers, thus eliminating one of the input offset adjustments. Procedures for nulling with adjustments are given as follows: A. AC Procedure: 1. Connect oscillator (1.0 kHz, 15 Vpp) to input. 2. Monitor output at 2.0 kHz with tuned voltmeter and adjust P3 for desired gain. (Be sure to peak response of the voltmeter.) 3. Tune voltmeter to 1.0 kHz and adjust P1 for a minimum output voltage. 4. Ground input and adjust P4 (output offset) for 0 Vdc output. 5. Repeat steps 1 through 4 as necessary. B. DC Procedure: 1. Set VX = VY = 0 V and adjust P4 (output offset potentiometer) such that VO = 0 Vdc 2. Set VX = VY = 1.0 V and adjust P1 (Y-input offset potentiometer) such that the output voltage is + 0.100 V. 3. Set VX = VY = 10 Vdc and adjust P3 such that the output voltage is + 10 V. 4. Set VX = VY = –10 Vdc. Repeat steps 1 through 3 as necessary. Figure 24. Basic Divide Circuit X KVX VY VX R1 VY - + R2 I2 I1 VZ |
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Descripción similar - MC1495P |
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