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參數(shù)資料
| 型號： | TC9402EJD |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 16/28頁 |
| 文件大?。?/td> | 545K |
| 描述： | IC V-FREQ/FREQ-V CONV 14CDIP |
| 標準包裝： | 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 |
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TC9400/9401/9402
DS21483D-page 16
?2007 Microchip Technology Inc.
FIGURE 6-4: DC 10kHz Converter.
6.4 Output Filtering
The output of the TC9400 has a sawtooth ripple super-
imposed on a DC level. The ripple will be rejected if the
TC9400 output is converted to a digital value by an
integrating Analog-to-Digital Converter, such as the
TC7107. The ripple can also be reduced by increasing
the value of the integrating capacitor, although this will
reduce the response time of the F/V converter.
The sawtooth ripple on the output of an F/V can be
eliminated without affecting the F/Vs response time by
using the circuit in Figure6-1. The circuit is a
capacitance multiplier, where the output coupling
capacitor is multiplied by the AC gain of the op amp. A
moderately fast op amp, such as the TL071, should be
used.
FIGURE 6-5: Ripple Filter.
TC9400A
TC9401A
TC9402A
+5V
14
V
DD
V+
V+
F
OUT
/2
F
OUT
Output
Common
10
9
8
5
3
12
12pF
C
REF
56pF
C
INT
1000pF
R
INT
1M?/DIV>
60pF
Amp
Out
V
OUT
V
SS
I
BIAS
1
4
10k?/DIV>
2.2k?/DIV>
100k?/DIV>
2k?/DIV>
-5V
+5V
Zero Adjust
2
7
(Typically -5V)
V
REF
F
IN
11
Threshold
Detector
3ms
Delay
*
*
*
*Optional If
Buffer is Needed
Offset
Adjust
V
REF
OUT
I
IN
42
+
Op
Amp
V
REF
See
Figure 7-1:
Frequency
Input Level
Shifter
6
GND
Threshold
Detect
1
47pF
V
OUT
TC9400
12
3
5
V
REF
OUT
I
IN
GND
AMP OUT
6
.001礔
+
1
3
2
.01礔
1M?nbsp 0.1礔
+5
7
6
4
-5
TL071
200?/DIV>
M?/DIV>
M?/DIV>
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