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| 型号： | TC820CPL |
| 厂商： | Microchip Technology |
| 文件页数： | 19/34页 |
| 文件大小： | 0K |
| 描述： | IC ADC 3 3/4DGT LGC PROBE 40DIP |
| 标准包装： | 10 |
| 显示器类型： | LCD |
| 配置： | 7 段 + 2 个信号器 |
| 数字或字符： | A/D，3.75 位数字 |
| 电流 - 电源： | 1mA |
| 电源电压： | 9V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 40-DIP（0.600"，15.24mm） |
| 供应商设备封装： | 40-PDIP |
| 包装： | 管件 |
| 产品目录页面： | 673 (CN2011-ZH PDF) |
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TC820
5.6.3
INTEGRATING CAPACITOR - C INT
TABLE 5-1:
REFERENCE VOLTAGE
C INT should be selected to maximize integrator output
SELECTION
voltage swing without causing output saturation. Analog
common will normally supply the differential voltage
reference. For this case, a ±2V integrator output swing is
optimum when the analog input is near full scale. For 2.5
readings/second (F OSC = 40 kHz) and V FS = 400 mV, a
0.22 μF value is suggested. If a different oscillator
Full Scale Input Voltage
(V FS ) (Note 1)
200 mV
400 mV
1V
V REF
(Note 2)
200 mV
500 mV
Resolution
—
10 μV
250 μV
frequency is used, C INT must be changed in inverse
proportion to maintain the nominal ±2V integrator
swing.
An exact expression for C INT is:
2V (Notes 3, 4) 1V 500 μV
Note 1: TC820 in A/D Converter mode, RANGE/
FREQ = logic low.
2: Not recommended.
EQUATION 5-2:
3:
V FS > 2V may exceed the Input Common
Where:
C INT =
4000 V FS
V INT R INT F OSC
4:
Full-scale voltage values are not limited to
the values shown. For example, TC820
F OSC
V FS
R INT
V INT
=
=
=
=
Clock Frequency
Full-Scale Input Voltage
Integrating Resistor
Desired Full-Scale Integrator
Output Swing
V FS can be any value from 400 mV to 2V.
In some applications, a scale factor other than unity
may exist between a transducer output voltage and the
required digital reading. Assume, for example, that a
pressure transducer output is 800 mV for 4000 lb/in 2 .
Rather than dividing the input voltage by two, the
reference voltage should be set to 400 mV. This per-
C INT must have low dielectric absorption to minimize
rollover error. A polypropylene capacitor is
recommended.
mits the transducer input to be used directly.
The internal voltage reference potential available at
analog common will normally be used to supply the
converter's reference voltage. This potential is stable
5.6.4
INTEGRATING RESISTOR - R INT
whenever the supply potential
is greater than
The input buffer amplifier and integrator are designed
with class A output stages. The integrator and buffer
can supply 40 μA drive currents with negligible linearity
errors. R INT is chosen to remain in the output stage
linear drive region, but not so large that printed circuit
board leakage currents induce errors. For a 400 mV
full-scale, R INT should be about 100 k Ω .
approximately 7V. The low battery detection circuit and
analog common operate from the same internal
reference. This ensures that the low battery annunciator
will turn on at the time the internal reference begins to
lose regulation.
The TC820 can also operate with an external
reference. Figure 5-7 shows internal and external ref-
erence applications.
5.7
Reference Voltage Selection
A full-scale reading (4000 counts for TC820) requires
the input signal be twice the reference voltage. See
Reference Voltage Selection, Table 5-1 below.
9V
+
22k Ω
MCP1525
V+
V SS
V DD
V REF + 2k Ω
V DD
TC820
V IN
V OUT
V SS
TC820
V REF -
Analog
Common
V REF
V REF +
V REF -
Analog
Common
1 μ F
SET V REF = 1/2 V FULL SCALE
? 2007 Microchip Technology Inc.
(a) Internal Reference
FIGURE 5-7:
Connections.
(b) External Reference
Reference Voltage
DS21476C-page 19
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