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TC9400CPD 데이터시트(PDF) 8 Page - Microchip Technology

부품명 TC9400CPD
상세설명  Voltage-to-Frequency/Frequency-to-Voltage Converters
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TC9400/9401/9402
DS21483B-page 8
© 2002 Microchip Technology Inc.
3.2
Voltage-to-Time Measurements
The TC9400 output can be measured in the time
domain as well as the frequency domain. Some micro-
computers, for example, have extensive timing capabil-
ity, but limited counter capability. Also, the response
time of a time domain measurement is only the period
between two output pulses, while the frequency mea-
surement must accumulate pulses during the entire
counter time-base period.
Time measurements can be made from either the
TC9400's PULSE FREQ OUT output, or from the
FREQ/2 OUT output. The FREQ/2 OUT output
changes state on the rising edge of PULSE FREQ
OUT, so FREQ/2 OUT is a symmetrical square wave at
one-half the pulse output frequency. Timing measure-
ments can, therefore, be made between successive
PULSE FREQ OUT pulses, or while FREQ/2 OUT is
high (or low).
4.0
PIN FUNCTIONS
4.1
Threshold Detector Input
In the V/F mode, this input is connected to the AMPLI-
FIER OUT output (Pin 12) and triggers a 3
µsec pulse
when the input voltage passes through its threshold. In
the F/V mode, the input frequency is applied to this
input.
The nominal threshold of the detector is half way
between the power supplies, or (VDD +VSS)/2 ±400mV.
The TC9400's charge balancing V/F technique is not
dependent on a precision comparator threshold,
because the threshold only sets the lower limit of the
Op Amp output. The Op Amp's peak-to-peak output
swing, which determines the frequency, is only
influenced by external capacitors and by VREF.
4.2
Pulse Freq Out
This output is an open drain N-channel FET, which pro-
vides a pulse waveform whose frequency is propor-
tional to the input voltage. This output requires a pull-
up resistor and interfaces directly with MOS, CMOS,
and TTL logic (see Figure 4-1).
FIGURE 4-1:
OUTPUT WAVEFORMS
3
µsec
Typ.
1/f
FOUT
FOUT/2
Amp Out
VREF
0V
CREF
CINT
Notes:
1. To adjust FMIN, set VIN = 10mV and adjust the 50kΩ offset for 10Hz output.
2. To adjust FMAX, set VIN = 10V and adjust RIN or VREF for 10kHz output.
3. To increase FOUTMAX to 100kHz, change CREF to 2pF and CINT to 75pF.
4. For high performance applications, use high stability components for RIN, CREF, VREF (metal film
resistors and glass capacitors). Also, separate output ground (Pin 9) from input ground (Pin 6).


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