参数资料
| 型号： | TC835CBU |
| 厂商： | Microchip Technology |
| 文件页数： | 12/26页 |
| 文件大小： | 0K |
| 描述： | IC ADC 4 1/2DGT BCD 64-MQFP |
| 标准包装： | 84 |
| 显示器类型： | LED |
| 配置： | 7 段显示 |
| 接口： | BCD |
| 数字或字符： | A/D，4.5 位数字 |
| 电流 - 电源： | 1mA |
| 电源电压： | 4 V ~ 6 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 64-BQFP |
| 供应商设备封装： | 64-PQFP（14x14） |
| 包装： | 管件 |
TC835
6.0
TYPICAL APPLICATIONS
6.1.2
AUTO ZERO AND REFERENCE
CAPACITORS
6.1
Component Value Selection
The size of the auto zero capacitor has some influence
The integrating resistor is determined by the full-scale
input voltage and the output current of the buffer used
to charge the integrator capacitor. Both the buffer
amplifier and the integrator have a class A output
stage, with 100 μA of quiescent current. A 20 μA drive
current gives negligible linearity errors. Values of 5 μA
to 40 μA give good results. The exact value of an
integrating resistor for a 20 μA current is easily
calculated.
on the noise of the system. A large capacitor reduces
the noise. The reference capacitor should be large
enough such that stray capacitance to ground from its
nodes is negligible.
The dielectric absorption of the reference capacitor and
auto zero capacitor are only important at power-on or
when the circuit is recovering from an overload.
Smaller or cheaper capacitors can be used if accurate
readings are not required for the first few seconds of
recovery.
EQUATION 6-1:
6.1.3
REFERENCE VOLTAGE
R INT =
Full scale voltage
20μA
T he analog input required to generate a full scale
output is V IN = 2V REF .
6.1.1
INTEGRATING CAPACITOR
The stability of the reference voltage is a major factor in
the overall absolute accuracy of the converter. For this
The product of integrating resistor and capacitor should
be selected to give the maximum voltage swing that
ensures the tolerance buildup will not saturate the
integrator swing (approximately 0.3V from either
reason, it is recommended that a high-quality reference
be used where high-accuracy absolute measurements
are being made.
supply). For ±5V supplies and ANALOG COMMON tied
to supply ground, a ±3.5V to ±4V full-scale integrator
6.2
Conversion Timing
swing is adequate. A 0.10 μF to 0.47 μF is
recommended. In general, the value of C INT is given
by:
EQUATION 6-2:
6.2.1 LINE FREQUENCY REJECTION
A signal integration period at a multiple of the 60Hz line
frequency will maximize 60Hz "line noise" rejection. A
200 kHz clock frequency will reject 60Hz and 400Hz
noise. This corresponds to five readings per second
C INT =
=
[10,000 x clock period] x I INT
Integrator output voltage swing
(10,000) (clock period) (20 μ A)
(see Table 6-1 and Table 6-2 ).
TABLE 6-1: CONVERSION RATE VS.
CLOCK FREQUENCY
Integrator output voltage swing
A very important characteristic of the integrating
capacitor is that it has low dielectric absorption to
prevent rollover or ratiometric errors. A good test for
dielectric absorption would be to use the capacitor with
the input tied to the reference. This ratiometric
condition should read half scale 0.9999, with any
deviation probably due to dielectric absorption.
Polypropylene capacitors give undetectable errors at
reasonable cost. Polystyrene and polycarbonate
capacitors may also be used in less critical
applications.
Oscillator Frequency
(kHz)
100
120
200
300
400
800
1200
Conversion Rate
(Conv./Sec.)
2.5
3
5
7.5
10
20
30
DS21478C-page 12
? 2007 Microchip Technology Inc.
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