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MPY634KU Datasheet(PDF) 5 Page - Texas Instruments |
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MPY634KU Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 17 page  MPY634 5 SBFS017A www.ti.com TYPICAL PERFORMANCE CURVES (CONT) T A = +25°C, VS = ±15VDC, unless otherwise noted. THEORY OF OPERATION The transfer function for the MPY634 is: VOUT = A – (Z1 – Z2) where: A = open-loop gain of the output amplifier (typically 85dB at DC). SF = Scale Factor. Laser-trimmed to 10V but adjustable over a 3V to 10V range using external resistors. X, Y, Z are input voltages. Full-scale input voltage is equal to the selected SF. (Max input voltage = ±1.25 SF). An intuitive understanding of transfer function can be gained by analogy to the op amp. By assuming that the open-loop gain, A, of the output operational amplifier is infinite, (X 1 – X2) (Y1 – Y2) SF inspection of the transfer function reveals that any VOUT can be created with an infinitesimally small quantity within the brackets. Then, an application circuit can be analyzed by assigning circuit voltages for all X, Y and Z inputs and setting the bracketed quantity equal to zero. For example, the basic multiplier connection in Figure 1, Z1 = VOUT and Z2 = 0. The quantity within the brackets then reduces to: – (VOUT – 0) = 0 This approach leads to a simple relationship which can be solved for VOUT to provide the closed-loop transfer function. The scale factor is accurately factory adjusted to 10V and is typically accurate to within 0.1% or less. The scale factor may be adjusted by connecting a resistor or potentiometer between pin SF and the –VS power supply. The value of the external resistor can be approximated by: (X 1 – X2) (Y1 – Y2) SF 14 12 10 8 6 4 810 12 16 18 20 Positive or Negative Supply (V) INPUT/OUTPUT SIGNAL RANGE vs SUPPLY VOLTAGES 14 Output, R L ≥ 2kΩ All inputs, SF = 10V –10 INPUT DIFFERENTIAL-MODE/ COMMON-MODE VOLTAGE –12 12 10 –5 5 –55 10 –10 Specified Accuracy V S = ±15V Functional Derated Accuracy V CM V DIFF 800 700 600 500 400 300 200 100 0 –20 0 60 100 140 Temperature (°C) BIAS CURRENTS vs TEMPERATURE (X,Y or Z Inputs) 20 –40 40 80 120 Scaling Voltage = 10V Scaling Voltage = 3V –60 |
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