ADVFC32SH【PDF 6/6 页】IC CONV V/F F/V MONO TO100-10

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Sheet目录38

2页 3页 4页 5页 [6页]

REV. B

ADVFC32

Figure 6. High Noise Immunity Data Link

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

14-Lead Plastic DIP (N-14)

PIN 1

0.795 (20.19)

0.725 (18.42)

0.280 (7.11)

0.240 (6.10)

0.100 (2.54)

BSC

SEATING

PLANE

0.060 (1.52)

0.015 (0.38)

0.210 (5.33)

MAX

0.022 (0.558)

0.014 (0.356)

0.160 (4.06)

0.115 (2.93)

0.070 (1.77)

0.045 (1.15)

0.130

(3.30)

MIN

0.195 (4.95)

0.115 (2.93)

0.015 (0.381)

0.008 (0.204)

0.325 (8.25)

0.300 (7.62)

TO-100 (H-10A)

0.250 (6.35) MIN

0.750 (19.05)

0.500 (12.70)

0.185 (4.70)

0.165 (4.19)

REFERENCE PLANE

0.050 (1.27) MAX

0.019 (0.48)

0.016 (0.41)

0.021 (0.53)

0.016 (0.41)

0.045 (1.14)

0.010 (0.25)

0.040 (1.02) MAX

BASE & SEATING PLANE

0.034 (0.86)

0.027 (0.69)

0.045 (1.14)

0.027 (0.69)

0.160 (4.06)

0.110 (2.79)

0.115

(2.92)

BSC

0.230 (5.84)

BSC

36?BSC

The data link input voltage is changed in a frequency modulated

signal by the first ADVFC32. A 42.2 k& input resistor and a

100k& offset resistor set the scaling so that a 0 V input signal

corresponds to 50 kHz, and a 10 V input results in the maximum

output frequency of 500 kHz. A high frequency optocoupler is

then used to transmit the signal across any common-mode volt-

age potentials to the receiving ADVFC32. The optocoupler is

not necessary in systems where common-mode noise is either

very small or a constant low level dc voltage. In systems where

common-mode voltage may present a problem, the connection

between the two locations should be through the optocoupler;

no power or ground connections need to be made.

The output of the optocoupler drives an ADVFC32 hooked up

in the F/V configuration. Since the reconstructed signal at Pin

10 has a considerable amount of carrier feedthrough, it is desir-

able to filter out any frequencies in the carrier range of 50 kHz

to 500 kHz. The frequency response of the F/V converter is only

3 kHz due to the pole made by the integrator, so a second 3 kHz

filter will not significantly limit the bandwidth. With the simple

one pole filter shown in Figure 6, the input to output 3 dB point

is approximately 2 kHz, and the output noise is less than 15mV.

If a lower output impedance drive is needed, a two-pole active

filter is recommended as an output stage.

Although the F/V conversion technique used in this circuit is

quite simple, it is also very limited in terms of its frequency

response and output ripple. The frequency response is limited

by the integrator time constant and while it is possible to decrease

that time constant, either signal range or output ripple must be

sacrificed. The performance of the circuit of Figure 6 is shown

in the photograph below. The top trace is the input signal, the

middle trace is the frequency-modulated signal at the opto-

couplers output, and the bottom trace is the recovered signal at

the output of the F/V converter.

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