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AD532SH bảng dữ liệu(PDF) 5 Page - Analog Devices |
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AD532SH bảng dữ liệu(HTML) 5 Page - Analog Devices |
5 / 7 page –5– REV. B AD532 DYNAMIC CHARACTERISTICS The closed loop frequency response of the AD532 in the multi- plier mode typically exhibits a 3 dB bandwidth of 1 MHz and rolls off at 6 dB/octave thereafter. Response through all inputs is essentially the same as shown in Figure 7. In the divide mode, the closed loop frequency response is a function of the absolute value of the denominator voltage as shown in Figure 8. Stable operation is maintained with capacitive loads to 1000 pF in all modes, except the square root for which 50 pF is a safe upper limit. Higher capacitive loads can be driven if a 100 Ω resistor is connected in series with the output for isolation. Figure 8. Frequency Response, Dividing POWER SUPPLY CONSIDERATIONS Although the AD532 is tested and specified with ±15 V dc supplies, it may be operated at any supply voltage from ±10 V to ±18 V for the J and K versions, and ±10 V to ±22 V for the S version. The input and output signals must be reduced propor- tionately to prevent saturation; however, with supply voltages below ±15 V, as shown in Figure 9. Since power supply sensitiv- ity is not dependent on external null networks as in the AD530 and other conventionally nulled multipliers, the power supply rejection ratios are improved from 3 to 40 times in the AD532. Figure 9. Signal Swing vs. Supply NOISE CHARACTERISTICS All AD532s are screened on a sampling basis to assure that output noise will have no appreciable effect on accuracy. Typi- cal spot noise vs. frequency is shown in Figure 10. Figure 10. Spot Noise vs. Frequency APPLICATIONS CONSIDERATIONS The performance and ease of use of the AD532 is achieved through the laser trimming of thin-film resistors deposited di- rectly on the monolithic chip. This trimming-on-the-chip tech- nique provides a number of significant advantages in terms of cost, reliability and flexibility over conventional in-package trimming of off-the-chip resistors mounted or deposited on a hybrid substrate. First and foremost, trimming on the chip eliminates the need for a hybrid substrate and the additional bonding wires that are required between the resistors and the multiplier chip. By trim- ming more appropriate resistors on the AD532 chip itself, the second input terminals that were once committed to external trimming networks (e.g., AD530) have been freed to allow fully differential operation at both the X and Y inputs. Further, the requirement for an input attenuator to adjust the gain at the Y input has been eliminated, letting the user take full advantage of the high input impedance properties of the input differential amplifiers. Thus, the AD532 offers greater flexibility for both algebraic computation and transducer instrumentation applications. Finally, provision for fine trimming the output voltage offset has been included. This connection is optional, however, as the AD532 has been factory-trimmed for total performance as described in the listed specifications. REPLACING OTHER IC MULTIPLIERS Existing designs using IC multipliers that require external trim- ming networks (such as the AD530) can be simplified using the pin-for-pin replaceability of the AD532 by merely grounding the X2, Y2 and VOS terminals. (The VOS terminal should always be grounded when unused.) |
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