JM38510/13903BIA 查看數據表（PDF） - Analog Devices

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JM38510/13903BIA

Internally Trimmed Integrated Circuit Multiplier

Analog Devices 

AD532

AD532 PERFORMANCE CHARACTERISTICS

Multiplication accuracy is defined in terms of total error at

25°C with the rated power supply. The value specified is in

percent of full scale and includes XIN and YIN nonlinearities,

feedback and scale factor error. To this must be added such

application-dependent error terms as power supply rejection,

common-mode rejection and temperature coefficients (although

worst case error over temperature is specified for the AD532S).

Total expected error is the rms sum of the individual compo-

nents since they are uncorrelated.

Accuracy in the divide mode is only a little more complex. To

achieve division, the multiplier cell must be connected in the

feedback of the output op amp as shown in Figure 13. In this

configuration, the multiplier cell varies the closed loop gain of the

op amp in an inverse relationship to the denominator voltage.

Thus, as the denominator is reduced, output offset, bandwidth

and other multiplier cell errors are adversely affected. The divide

error and drift are then ⑀m × 10 V/X1 – X2) where ⑀m represents

multiplier full-scale error and drift, and (X1–X2) is the absolute

value of the denominator.

NONLINEARITY

Nonlinearity is easily measured in percent harmonic distortion.

The curves of Figures 3 and 4 characterize output distortion as

a function of input signal level and frequency respectively, with

one input held at plus or minus 10 V dc. In Figure 4 the sine

wave amplitude is 20 V (p-p).

1.0

XIN

YIN

0.1

0.01

1 2 3 4 5 6 7 8 9 10 11 12 13 14

PEAK SIGNAL AMPLITUDE ؊ Volts

Figure 3. Percent Distortion vs. Input Signal

100

10

20V p-p SIGNAL

AC FEEDTHROUGH

AC feedthrough is a measure of the multiplier’s zero suppression.

With one input at zero, the multiplier output should be zero

regardless of the signal applied to the other input. Feedthrough

as a function of frequency for the AD532 is shown in Figure 5. It

is measured for the condition VX = 0, VY = 20 V (p-p) and VY = 0,

VX = 20 V (p-p) over the given frequency range. It consists

primarily of the second harmonic and is measured in millivolts

peak-to-peak.

1000

Y FEEDTHROUGH

100

X FEEDTHROUGH

10

1

100

1k

10k

100k

1M

10M

FREQUENCY ؊ Hz

Figure 5. Feedthrough vs. Frequency

COMMON-MODE REJECTION

The AD532 features differential X and Y inputs to enhance its

flexibility as a computational multiplier/divider. Common-mode

rejection for both inputs as a function of frequency is shown in

Figure 6. It is measured with X1 = X2 = 20 V (p-p), (Y1 – Y2) =

10 V dc and Y1 = Y2 = 20 V (p-p), (X1 – X2) = 10 V dc.

70

60

50

Y COMMON-MODE REJ

(X1؊X2) ؍؉10V

40

30

X COMMON-MODE REJ

(Y1؊Y2) ؍؉10V

20

10

0

100

1k

10k

100k

1M

10M

FREQUENCY ؊ Hz

Figure 6. CMRR vs. Frequency

1.0

XIN

YIN

0.1

10

100

1k

10k

100k

1M

FREQUENCY ؊ Hz

Figure 4. Percent Distortion vs. Frequency

–4–

REV. C

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