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| 型号： | TC7107CKW |
| 厂商： | Microchip Technology |
| 文件页数： | 8/34页 |
| 文件大小： | 0K |
| 描述： | IC ADC 3 1/2DGT LED DVR 44-MQFP |
| 标准包装： | 96 |
| 显示器类型： | LED |
| 配置： | 7 段显示 |
| 数字或字符： | A/D，3.5 位数字 |
| 电流 - 电源： | 800µA |
| 电源电压： | 5V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-QFP |
| 供应商设备封装： | 44-MQFP（10x10） |
| 包装： | 托盘 |
| 产品目录页面： | 673 (CN2011-ZH PDF) |
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TC7106/A/TC7107/A
3.0
DETAILED DESCRIPTION
For a constant V IN :
( All Pin designations refer to 40-Pin PDIP. )
EQUATION 3-2:
3.1 Dual Slope Conversion Principles
The TC7106A and TC7107A are dual slope, integrating
V IN = V R
T RI
T SI
Analog-to-Digital Converters. An understanding of the
dual slope conversion technique will aid in following the
detailed operation theory.
The conventional dual slope converter measurement
cycle has two distinct phases:
? Input Signal Integration
? Reference Voltage Integration (De-integration)
The input signal being converted is integrated for a
fixed time period (T SI ). Time is measured by counting
clock pulses. An opposite polarity constant reference
voltage is then integrated until the integrator output
voltage returns to zero. The reference integration time
The dual slope converter accuracy is unrelated to the
integrating resistor and capacitor values as long as
they are stable during a measurement cycle. An
inherent benefit is noise immunity. Noise spikes are
integrated or averaged to zero during the integration
periods. Integrating ADCs are immune to the large
conversion errors that plague successive
approximation converters in high noise environments.
Interfering signals with frequency components at
multiples of the averaging period will be attenuated.
Integrating ADCs commonly operate with the signal
integration period set to a multiple of the 50/60Hz
power line period (see Figure 3-2 ).
is directly proportional to the input signal (T RI ). See
30
Analog
C
Input
Signal
Integrator
–
+
Comparator
–
+
20
+/–
REF
Voltage
Switch
Driver
Phase
Control
Polarity Control
Control
Logic
10
0
T = Measured Period
DISPLAY
Counter
0.1/T
1/T
Input Frequency
10/T
V IN μ V REF
V IN μ 1/2 V REF
FIGURE 3-2:
Normal Mode Rejection of
( 4000 ) ? ------------- ? ? ----------- ?
? F OSC ? ? R INT ?
C INT
Fixed Variable
Signal Reference
Integrate Integrate
Time Time
FIGURE 3-1: Basic Dual Slope Converter.
In a simple dual slope converter, a complete
Dual Slope Converter.
1 V FS
= ------------------------------------------------------
V INT
Where:
-------- ∫
V IN ( t ) dt = ---------------
conversion requires the integrator output to “ramp-up”
and “ramp-down.” A simple mathematical equation
relates the input signal, reference voltage and
integration time.
EQUATION 3-1:
1 T SI
V R T RI
RC 0
RC
F OSC
V FS
R INT
V INT
=
=
=
=
Clock Frequency at Pin 38
Full Scale Input Voltage
Integrating Resistor
Desired Full Scale Integrator Output
Swing
Where:
V R
T SI
T RI
=
=
=
Reference voltage
Signal integration time (fixed)
Reference voltage integration time
(variable).
DS21455D-page 8
? 2008 Microchip Technology Inc.
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相关代理商/技术参数 |
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|---|---|
| TC7107CKW713 | 功能描述:LED显示驱动器 w/LED Driver RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube |
| TC7107CLW | 功能描述:LED显示驱动器 w/LED Driver RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube |
| TC7107CLW713 | 功能描述:LED显示驱动器 w/LED Driver RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube |
| TC7107CPL | 功能描述:LED显示驱动器 w/LED Driver RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube |
| TC7107CPL | 制造商:Microchip Technology Inc 功能描述:Leaded Process Compatible:No |
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