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參數(shù)資料
| 型號(hào)： | VFC101JN |
| 英文描述： | Synchronized VOLTAGE-TO-FREQUENCY CONVERTER |
| 中文描述： | 同步電壓頻率轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 6/10頁(yè) |
| 文件大?。?/td> | 136K |
| 代理商： | VFC101JN |
6
VFC101
FIGURE 2. Offset for Bipolar Input Voltages.
Mylar, Teflon E. I. du Pont de Nemours & Co.
Integrator
Comparator
Clocked
Logic
Output
One-Shot
5
4
17
13
18
2
+V
CC
14
15
f
OUT
0 to f
CLOCK
/2
Digital
Ground
12
11
–V
CC
16
Analog
Ground
5V
Reference
20
C
INT
0.1μF
+V
L
0.1μF
+V
CC
f
TTL/CMOS
I
1
+V
CC
0.1μF
–V
CC
–V
CC
1mA
7
9
10k
8
10k
16k
10
4k
6
V
IN
–5V
to
+5V
INSTALLATION AND
OPERATING INSTRUCTIONS
The integrator capacitor C
INT
(see Figure 1) affects the
magnitude of the integrator voltage waveform. Its absolute
accuracy is not critical since it does not affect the transfer
function. Figure 3 facilitates choosing an appropriate stan-
dard value to assure that the integrator waveform voltage is
within acceptable limits. Good dielectric absorption proper-
ties are required to achieve best linearity. Mylar, polycar-
bonate, mica, polystyrene, Teflon and glass types are
appropriate choices. Choice will depend on the particular
value and size. Ceramic capacitors vary considerably from
type to type and some produce significant nonlinearities.
Polarized capacitors should not be used.
Deviation from the nominal recommended +1V to –0.75V
integrator voltage (as controlled by the integrator capacitor
value) is permissible and will have a negligible effect on
FIGURE 3. Integrator Capacitor Selection Graph.
+1V
–0.75V
10μ
1μ
0.1μ
0.01μ
1000p
100p
100
1k
10k
100k
1M
Full-Scale Frequency (Hz)
+2.5V
–1.9V
C
I
(
NOTE: (1)This is the maximum swing of the integrator output
voltage referred to the comparator noninverting input voltage.
Integrator Swing
(1)
+100mV
–75mV
1M
VFC operation. It may be desirable to deviate from the
suggested value. Smaller integrator voltages, for instance,
allow more “headroom” for averaging noisy input signals.
The VFC is a fully integrating input converter, able to reject
large levels of interfering noise. This ability is limited only
by the output voltage swing range of the integrator amplifier.
By setting a small integrator voltage swing using a large
C
INT
value, larger levels of noise can be integrated without
integrator output saturation and loss of accuracy.
The maximum integrator voltage swing requirement is nearly
symmetrical about the comparator threshold voltage (see
Figure 5.) One-third greater swing is required above the
threshold than below it. Maximum demand on positive
integrator swing occurs at low scale, while the negative
swing is greatest just below full scale.
CLOCK INPUT
The clock input is TTL- and CMOS-compatible. Its input
threshold is approximately 1.4V (two diode voltage drops)
referenced to digital ground (pin 15). The clock “high” input
may be standard TLL or may be as high as +V
. The clock
input has a high input impedance, so no special drivers are
required. Rise time in the transition region from 0.5V to 2V
must be less than 2
μ
s for proper operation.
OUTPUT
The frequency output is an open collector current-sink
transistor. Output pulses are active-low during the reset
integration period (see “Shortened Output Pulses”.)
Interface to a logic circuit normally uses a pull-up resistor to
the logic power supply. Selection of the pull-up resistor
should be made such that no more than 15mA flows in the
output transistor. The actual choice of the pull-up resistor
may depend on the full-scale frequency and the stray capaci-
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| VFC101KN | 制造商:BB 制造商全稱(chēng):BB 功能描述:Synchronized VOLTAGE-TO-FREQUENCY CONVERTER |
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| VFC-1106 | 制造商:Quest Technology International Inc 功能描述: |
| VFC110AG | 功能描述:電壓頻率轉(zhuǎn)換及頻率電壓轉(zhuǎn)換 Hi f V to f RoHS:否 制造商:Texas Instruments 全標(biāo)度頻率:4000 KHz 線性誤差:+/- 1 % FSR 電源電壓-最大: 電源電壓-最小: 最大工作溫度:+ 85 C 最小工作溫度:- 25 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-14 封裝:Tube |
| VFC110AP | 功能描述:電壓頻率轉(zhuǎn)換及頻率電壓轉(zhuǎn)換 VOLTAGE-TO-FREQUENCY CONVERTER RoHS:否 制造商:Texas Instruments 全標(biāo)度頻率:4000 KHz 線性誤差:+/- 1 % FSR 電源電壓-最大: 電源電壓-最小: 最大工作溫度:+ 85 C 最小工作溫度:- 25 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-14 封裝:Tube |
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