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| 型号： | TC9400COD713 |
| 元件分类： | 模拟专用变换器 |
| 英文描述： | VOLTAGE-FREQUENCY CONVERTER, 0.1 MHz, PDSO14 |
| 封装： | SOIC-14 |
| 文件页数： | 2/28页 |
| 文件大小： | 545K |
| 代理商： | TC9400COD713 |
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TC9400/9401/9402
DS21483D-page 10
2007 Microchip Technology Inc.
4.0
VOLTAGE-TO-FREQUENCY
(V/F) CONVERTER DESIGN
INFORMATION
4.1
Input/Output Relationships
The output frequency (FOUT) is related to the analog
input voltage (VIN) by the transfer equation:
EQUATION 4-1:
4.2
External Component Selection
4.2.1
RIN
The value of this component is chosen to give a full
scale input current of approximately 10 A:
EQUATION 4-2:
EQUATION 4-3:
Note that the value is an approximation and the exact
relationship is defined by the transfer equation. In
practice, the value of RIN typically would be trimmed to
obtain full scale frequency at VIN full scale (see
Section 4.3 “Adjustment Procedure”, Adjustment
Procedure). Metal film resistors with 1% tolerance or
better are recommended for high accuracy applications
because of their thermal stability and low noise
generation.
4.2.2
CINT
The exact value is not critical but is related to CREF by
the relationship:
3CREF ≤ CINT ≤ 10CREF
Improved stability and linearity are obtained when
CINT ≤ 4CREF. Low leakage types are recommended,
although mica and ceramic devices can be used in
applications where their temperature limits are not
exceeded. Locate as close as possible to Pins 12
and 13.
4.2.3
CREF
The exact value is not critical and may be used to trim
the full scale frequency (see Section 6.1 “Input/Out-
put Relationships”, Input/Output Relationships).
Glass film or air trimmer capacitors are recommended
because of their stability and low leakage. Locate as
close as possible to Pins 5 and 3 (see Figure 4-1).
FIGURE 4-1:
Recommended CREF vs.
VREF.
4.2.4
VDD, VSS
Power supplies of ±5V are recommended. For high
accuracy requirements, 0.05% line and load regulation
and 0.1 F disc decoupling capacitors, located near the
pins, are recommended.
4.3
Adjustment Procedure
Figure 3-1 shows a circuit for trimming the zero
location. Full scale may be trimmed by adjusting RIN,
VREF, or CREF. Recommended procedure for a 10 kHz
full scale frequency is as follows:
1.
Set VIN to 10 mV and trim the zero adjust circuit
to obtain a 10 Hz output frequency.
2.
Set VIN to 10V and trim either RIN, VREF, or CREF
to obtain a 10 kHz output frequency.
If adjustments are performed in this order, there should
be no interaction and they should not have to be
repeated.
4.4
Improved Single Supply V/F
Converter Operation
A TC9400, which operates from a single 12 to 15V
variable power source, is shown in Figure 4-2. This
circuit uses two Zener diodes to set stable biasing
levels for the TC9400. The Zener diodes also provide
the reference voltage, so the output impedance and
temperature coefficient of the Zeners will directly affect
power supply rejection and temperature performance.
Full scale adjustment is accomplished by trimming the
input current.
Frequency Out
VIN
RIN
--------
1
VREF
() C
REF
()
------------------------------------
=
VIN FULL SCALE
10
μA
RIN
10V
10
μA
RIN
= 1 M
Ω
500
400
300
200
100
0
-1
-2
-3
-4
-5
-6
-7
VREF (V)
C
REF
(pF)
+12pF
10 kHz
100 kHz
VDD = +5V
VSS = -5V
RIN = 1MW
VIN = +10V
TA = +25°C
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