參數(shù)資料
型號(hào)： TC9402EJD
廠商： Microchip Technology
文件頁(yè)數(shù)： 7/28頁(yè)
文件大?。?/td> 545K
描述： IC V-FREQ/FREQ-V CONV 14CDIP
標(biāo)準(zhǔn)包裝： 29
類型： 電壓至頻率和頻率至電壓
頻率 - 最大： 100kHz
全量程： ±100ppm/°C
線性： ±0.25%
安裝類型： 通孔
封裝/外殼： 14-CDIP（0.300"，7.62mm）
供應(yīng)商設(shè)備封裝： 14-CERDIP
包裝： 管件
?2007 Microchip Technology Inc.
DS21483D-page 7
TC9400/9401/9402
2.6  Pulse Freq Out
This output is an open-drain N-channel FET, which
provides 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 Figure2-1).
2.7  Output Common
The sources of both the FREQ/2 OUT and the PULSE
FREQ OUT are connected to this pin. An output level
swing from the drain voltage to ground, or to the V
SS
supply, may be obtained by connecting this pin to the
appropriate point.
2.8  Freq/2 Out
This output is an open-drain N-channel FET, which
provides a square-wave one-half the frequency of the
pulse frequency output. The FREQ/2 OUT output will
change state on the rising edge of PULSE FREQ OUT.
This output requires a pull-up resistor and interfaces
directly with MOS, CMOS, and TTL logic.
2.9  Threshold Detector Input
In the V/F mode, this input is connected to the AMPLI-
FIER OUT output (Pin 12) and triggers a 3祍 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 (V
DD
 + V
SS
)/2 ?00
mV. The TC9400s 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 amps peak-to-peak output swing,
which determines the frequency, is only influenced by
external capacitors and by V
REF
.
2.10  Amplifier Out
This pin is the output stage of the operational amplifier.
During V/F operation, a negative going ramp signal is
available at this pin. In the F/V mode, a voltage
proportional to the frequency input is generated.
FIGURE 2-1:    Output Waveforms.
3ms
Typ.
1/f
F
OUT
F
OUT
/2
Amp Out
V
REF
0V
C
REF
C
INT
 
Note1: To adjust F
MIN
, set V
IN
 = 10mV and adjust the 50k?offset for 10Hz output.
2: To adjust F
MAX
, set V
IN
 = 10V and adjust R
IN
 or V
REF
 for 10kHz output.
3: To increase F
OUTMAX
 to 100kHz, change C
REF
 to 2pF and C
INT
 to 75pF.
4: For high performance applications, use high stability components for R
IN
, C
REF
. V
REF
 (metal film
resistors and glass capacitors). Also, separate output ground (Pin 9) from input ground (Pin 6).
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