AD734 Analog Devices, AD734 Datasheet
AD734
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AD734 Summary of contents
Page 1
... The internal scaling (denominator) voltage derived from a buried-Zener voltage reference. A new feature provides the option of substituting an external denominator voltage, allowing the use of the AD734 as a two-quadrant divider with a 1000:1 denominator range and a signal bandwidth that remains 10 MHz to a gain of 20 dB, 2 MHz at a gain and 200 kHz at a gain of 60 dB, for a gain-bandwidth product of 200 MHz ...
Page 2
... AD734–SPECIFICATIONS TRANSFER FUNCTION Parameter Conditions MULTIPLIER PERFORMANCE Transfer Function 1 Total Static Error –10 V Over MIN MAX vs. Temperature T MIN vs. Either Supply V Peak Nonlinearity –10 V – THD rms + MIN rms + MIN Feedthrough rms nulled rms nulled, f Noise (RTO Spectral Density 100 MHz ...
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... X, Y and Z Input Voltages . . . . . . . . . . . . . . . . . . . . Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite Storage Temperature Range – +150 C Operating Temperature Range AD734A, B (Industrial – +85 C AD734S (Military – +125 C Lead Temperature Range (soldering 60 sec +300 C Transistor Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500 V NOTES 1 Stresses above those listed under Absolute Maximum Ratings may cause perma- nent damage to the device. This is a stress rating only ...
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... The common-mode range of the X, Y and Z inputs does not A O fully extend to the supply rails. Nevertheless often possible AD734 to operate the AD734 with one terminal of an input pair con- nected to either the positive or negative supply, unlike previous Z1 multipliers. The common-mode resistance is several megohms. ZIF – ...
Page 5
... Full details of the operation in these modes is provided in the appropriate section of this data sheet. Direct Denominator Control A valuable new feature of the AD734 is the provision to replace the internal denominator voltage, U, with any value from + +10 V. This can be used (1) to simply alter the multiplier scaling, thus improve accuracy and achieve reduced noise levels when operating with small input signals ...
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... Specifications table). OPERATION AS A MULTIPLIER All of the connection schemes used in this section are essentially identical to those used for the AD534, with which the AD734 is pin-compatible. The only precaution to be noted in this regard is that in the AD534, Pins and 13 are not internally connected and Pin 4 has a slightly different purpose ...
Page 7
... S C OPERATION AS A DIVIDER The AD734 supports two methods for performing analog division. The first is based on the use of a multiplier in a feed- back loop. This is the standard mode recommended for multipliers having a fixed scaling voltage, such as the AD534, and will be described in this Section. The second uses the AD734’ ...
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... DIVISION BY DIRECT DENOMINATOR CONTROL The AD734 may be used as an analog divider by directly vary- ing the denominator voltage. In addition to providing much higher accuracy and bandwidth, this mode also provides greater flexibility, because all inputs remain available. Figure 10 shows ...
Page 9
... This occurs when there is sufficient gain to raise the amplitude of E required to establish an output amplitude +10 V. The X input of the AD734, which has finite offset voltage, could be troublesome at the output at high gains. The output offset is reduced to that of the X input (one or two millivolts) by the offset loop comprising R3, C3, and buffer A1 ...
Page 10
... MHz. Thus, provided that the desired output signal is less than 10 MHz, as would typically be the case in demodulation, the AD734 can be used with both its X and Y input signals as high as 40 MHz. One test of mixer performance is to linearly combine two closely spaced, equal-amplitude sinusoidal signals and then mix them with a third signal to determine the mixer’ ...
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... Figure 24. PSRR vs. Frequency 0 TEST INPUT = 7V RMS –20 OTHER INPUT = 10V LOAD –40 X INPUT –60 Y INPUT –80 1k 10k 100k 1M 10M FREQUENCY – Hz Figure 27. THD vs. Frequency –11– AD734 V = 15V 1.4V RMS 0 10V R = 500 LOAD 0 20pF LOAD 0.1 0 –0.1 –0.2 –0.3 –0.4 100k 1M 10M FREQUENCY – ...
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... AD734–Typical Characteristics 15V 1.4V rms Y = 10V 500 LOAD 20pF, 47pF, LOAD INCREASING 100pF 1 C LOAD 0 –1 –2 –3 –4 –5 100k 1M 10M FREQUENCY – Hz Figure 29. Gain vs. Frequency vs. C LOAD –5 –10 –15 – SUPPLY VOLTAGE – V Figure 32. Output Swing vs. Supply ...