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| 型号： | TC9402EJD |
| 厂商： | Microchip Technology |
| 文件页数： | 17/28页 |
| 文件大小： | 545K |
| 描述： | IC V-FREQ/FREQ-V CONV 14CDIP |
| 标准包装： | 29 |
| 类型： | 电压至频率和频率至电压 |
| 频率 - 最大： | 100kHz |
| 全量程： | ±100ppm/°C |
| 线性： | ±0.25% |
| 安装类型： | 通孔 |
| 封装/外壳： | 14-CDIP（0.300"，7.62mm） |
| 供应商设备封装： | 14-CERDIP |
| 包装： | 管件 |
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?2007 Microchip Technology Inc.
DS21483D-page 17
TC9400/9401/9402
7.0 F/V POWER-ON RESET
In F/V mode, the TC9400 output voltage will occasion-
ally be at its maximum value when power is first
applied. This condition remains until the first pulse is
applied to F
IN
. In most frequency measurement
applications, this is not a problem because proper
operation begins as soon as the frequency input is
applied.
In some cases, however, the TC9400 output must be
zero at power-on without a frequency input. In such
cases, a capacitor connected from Pin 11 to V
DD
will
usually be sufficient to pulse the TC9400 and provide a
Power-on Reset (see Figure7-1 (a) and (b)). Where
predictable power-on operation is critical, a more
complicated circuit, such as Figure7-1 (b), may be
required.
FIGURE 7-1: Power-On Operation/Reset.
V
DD
14
11
1000pF
Threshold
Detector
1k?/DIV>
F
IN
V
DD
100k?/DIV>
1礔
3
4
8
6
F
IN
1
2
5
16
V
CC
B R C
Q
V
SS
A
CLRA
CD4538
TC9400
(a)
(b)
To TC9400
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