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TC9400COD 数据表(PDF) 7 Page - Microchip Technology

部件名 TC9400COD
功能描述  Voltage-to-Frequency/Frequency-to-Voltage Converters
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

TC9400COD 数据表(HTML) 7 Page - Microchip Technology

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© 2002 Microchip Technology Inc.
DS21483B-page 7
TC9400/9401/9402
3.0
DETAILED DESCRIPTION
3.1
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 eas-
ily understood by referring to Figure 3-1. The input volt-
age (VIN) is converted to a current (IIN) 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 volt-
age. This action reduces the charge on the integrating
capacitor by a fixed amount (q = CREF xVREF), causing
the Op Amp output to step up a finite amount.
At the end of the charging period, CREF is shorted out.
This dissipates the charge stored on the reference
capacitor, so that when the output again crosses zero,
the system is ready to recycle. In this manner, the con-
tinued discharging of the integrating capacitor by the
input is balanced out by fixed charges from the refer-
ence voltage. As the input voltage is increased, the
number of reference pulses required to maintain bal-
ance increases, which causes the output frequency to
also increase. Since each charge increment 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.
The TC9400 contains a "self-start" circuit to ensure the
V/F converter always operates properly when power is
first applied. In the event that, during power-on, the Op
Amp output is below the threshold and CREF is already
charged, a positive voltage step will not occur. The Op
Amp output will continue to decrease until it crosses the
-3.0V threshold of the "self-start" comparator. When
this happens, an internal resistor is connected to the
Op Amp input, which forces the output to go positive
until the TC9400 is in its Normal Operating mode.
The TC9400 utilizes low power CMOS processing for
low input bias and offset currents, with very low power
dissipation. The open drain N-channel output FETs
provide high voltage and high current sink capability.
FIGURE 3-1:
10Hz TO 10kHz V/F CONVERTER
+
+5V
+5V
14
VDD
+5V
RL
10k
RL
10k
8
10
9
FOUT
FOUT/2
11
3
µsec
Delay
Self-
Start
12
5
20k
60pF
Op Amp
CINT
820pF
CREF
180pF
12pF
RIN
1M
VIN
+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
INPUT


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