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參數(shù)資料
| 型號(hào)： | TC9402EJD |
| 廠商： | TelCom Semiconductor, Inc. |
| 英文描述： | POT 1.0K OHM 6MM CERMET TOP SMD |
| 中文描述： | VOLTAGE-TO-FREQUENCY/FREQUENCY-TO-VOLTAGE變換器 |
| 文件頁數(shù)： | 5/13頁 |
| 文件大?。?/td> | 154K |
| 代理商： | TC9402EJD |
3-291
TELCOM SEMICONDUCTOR, INC.
7
6
5
4
3
1
2
8
Figure 1. 10 Hz to 10 kHz V/F Converter
–
+
+5V
+5V
14
VDD
+5V
RL
10k
RL
10k
8
10
9
fOUT
fOUT/2
11
3
μ
sec
DELAY
SELF-
START
12
5
20k
60pF
OpAmp
CINT
820pF
CREF
180pF
12pF
RIN
1M
VIN
INPUT
+5V
–5V
50k
510k
10k
3
1
OFFSET
ADJUST
IIN
ZERO
ADJUST
0V –10V
IBIAS
VSS
4
–5V
2
OUTPUT
COMMON
VREF OUT
RBIAS
100k
AMP OUT
TC9400
TC9401
TC9402
GND
6
THRESHOLD
DETECTOR
THRESHOLD
DETECT
REFERENCE
VOLTAGE
(TYPICALLY –5V)
÷
2
VREF
7
–3V
At the end of the charging period, C
REF
is shorted out.
This dissipates the charge stored on the reference capaci-
tor, so that when the output again crosses zero the system
is ready to recycle. In this manner, the continued discharg-
ing of the integrating capacitor by the input is balanced out
by fixed charges from the reference voltage. As the input
voltage is increased, the number of reference pulses re-
quired to maintain balance increases, which causes the
output frequency to also increase. Since each charge in-
crement is fixed, the increase in frequency with voltage is
linear. In addition, the accuracy of the output pulse width
does not directly affect the linearity of the V/F. The pulse
must simply be long enough for full charge transfer to take
place.
VOLTAGE-TO-FREQUENCY (V/F)
CIRCUIT DESCRIPTION
The TC9400 V/F converter operates on the principal
of charge balancing. The operation of the TC9400 is easily
understood by referring to Figure 1. The input voltage (V
IN
)
is converted to a current (I
IN
) by the input resistor. This
current is then converted to a charge on the integrating
capacitor and shows up as a linearly decreasing voltage at
the output of the op amp. The lower limit of the output
swing is set by the threshold detector, which causes the
reference voltage to be applied to the reference capacitor
for a time period long enough to charge the capacitor to
the reference voltage. This action reduces the charge on
the integrating capacitor by a fixed amount (q = C
REF
×
V
REF
), causing the op amp output to step up a finite
amount.
VOLTAGE-TO-FREQUENCY/
FREQUENCY-TO-VOLTAGE CONVERTERS
TC9400
TC9401
TC9402
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TC9491ACOA | LOW POWER, BANDGAP VOLTAGE REFERENCES |
| TC9491A | LOW POWER, BANDGAP VOLTAGE REFERENCES |
| TC9491ACZM | LOW POWER, BANDGAP VOLTAGE REFERENCES |
| TC9491B | LOW POWER, BANDGAP VOLTAGE REFERENCES |
| TC9491BCOA | LOW POWER, BANDGAP VOLTAGE REFERENCES |
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