参数资料
型号: TC9400EJDG
元件分类: 模拟专用变换器
英文描述: VOLTAGE-FREQUENCY CONVERTER, 0.1 MHz, CDIP14
封装: CERDIP-14
文件页数: 3/28页
文件大小: 545K
代理商: TC9400EJDG
2007 Microchip Technology Inc.
DS21483D-page 11
TC9400/9401/9402
Trimming the reference voltage is not recommended
for high accuracy applications unless an op amp is
used as a buffer, because the TC9400 requires a low-
impedance reference (see Section 2.5 “Voltage Ref-
erence (VREF)”, VREF pin description, for more infor-
mation).
The circuit of Figure 4-2 will directly interface with
CMOS logic operating at 12V to 15V. TTL or 5V CMOS
logic can be accommodated by connecting the output
pull-up resistors to the +5V supply. An optoisolator can
also be used if an isolated output is required; also, see
FIGURE 4-2:
Voltage-to-Frequency.
R1
910 k
Ω
R4
1F
D2
5.1 VZ
R2
910 k
Ω
R5
91 k
Ω
Rp
Offset
20 k
Ω
100 k
Ω
D1
5.1 VZ
0.1 F
100 k
Ω
CREF
CINT
1.2 k
Ω
+12 to +15V
10
10 k
Ω
Output
Frequency
Digital
Ground
Analog Ground
Input
Voltage
(0 to 10V)
R3
Gain
TC9400
11
12
5
3
2
6
7
1
4
14
9
10
8
Threshold
Detect
Amp Out
CREF
IIN
Zero Adjust
GND
VREF
IBIAS
Output
Common
FOUT/2
FOUT
VDD
VSS
100 k
Ω
k
Ω
Component Selection
F/S Freq.
CREF
CINT
1 kHz
2200 pF 4700 pF
10 kHz
180 pF
470 pF
100 kHz
27 pF
75 pF
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