- 您现在的位置：买卖IC网 > PDF目录1880 > TC7126CLW713 (Microchip Technology)IC ADC 3 1/2DGT LCD DVR 44-PLCC PDF资料下载
参数资料
| 型号： | TC7126CLW713 |
| 厂商： | Microchip Technology |
| 文件页数： | 9/26页 |
| 文件大小： | 0K |
| 描述： | IC ADC 3 1/2DGT LCD DVR 44-PLCC |
| 标准包装： | 500 |
| 显示器类型： | LCD |
| 配置： | 7 段显示 |
| 数字或字符： | A/D，3.5 位数字 |
| 电流 - 电源： | 55µA |
| 电源电压： | 9V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-LCC（J 形引线） |
| 供应商设备封装： | 44-PLCC |
| 包装： | 带卷 (TR) |
TC7126/A
3.0
DETAILED DESCRIPTION
EQUATION 3-1:
∫
(All Pin Designations Refer to 40-Pin PDIP.)
3.1
Dual Slope Conversion Principles
Where:
1 T SI
RC 0
V IN (t)d t =
V R T RI
RC
The TC7126A is a dual slope, integrating analog-to-
digital converter. An understanding of the dual slope
conversion technique will aid in following the detailed
TC7126/A operation theory.
The conventional dual slope converter measurement
cycle has two distinct phases:
V R = Reference voltage
T SI = Signal integration time (fixed)
T RI = Reference voltage integration time (variable)
For a constant V IN :
EQUATION 3-2:
RI
-------
R T
? Input Signal Integration
? Reference Voltage Integration (De-integration)
The input signal being converted is integrated for a
V
IN
=
V
T
SI
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
is directly proportional to the input signal (T RI ) (see
Figure ).
The dual slope converter accuracy is unrelated to the
integrating resistor and capacitor values, as long as
they are stable during a measurement cycle. Noise
immunity is an inherent benefit. Noise spikes are inte-
grated or averaged to zero during integration periods.
Integrating ADCs are immune to the large conversion
errors that plague successive approximation convert-
Analog
Input
Signal
Integrator
Comparator
ers 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 50Hz/60Hz power line period (see
Figure 3-2).
REF
Voltage
Switch
Driver
Phase
Control
Polarity Control
Control
Logic
Clock
30
Display
Counter
20
V IN ? V REF
V IN ? 1.2 V REF
10
Fixed
Signal
Integrate
Time
Variable
Reference
Integrate
Time
0
t = Measurement Period
FIGURE 3-1:
Basic Dual Slope Converter
0.1/t
1/t
Input Frequency
10/t
In a simple dual slope converter, a complete conver-
sion requires the integrator output to “ramp-up” and
FIGURE 3-2:
Normal Mode Rejection of
“ramp-down.”
A simple mathematical equation relates the input
signal, reference voltage and integration time:
? 2006 Microchip Technology Inc.
Dual Slope Converter
DS21458C-page 9
相关PDF资料 |
PDF描述 |
|---|---|
| TC7129CLW713 | IC ADC 4 1/2DGT LCD DVR 44-PLCC |
| TC7135CLI713 | IC ADC 4 1/2DGT 28-PLCC |
| TC7136CKW713 | IC ADC 3 1/2DGT LOW PWR 44-MQFP |
| TC7660MJA | IC REG SWITCHD CAP INV ADJ 8CDIP |
| TC820CKW713 | IC ADC 3 3/4DGT LGC PROBE 44MQFP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TC7126CPL | 功能描述:LCD 驱动器 Low Power RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TC7126CPL | 制造商:Microchip Technology Inc 功能描述:3.5 DIGIT ADC CMOS 7126 DIP40 制造商:Microchip Technology Inc 功能描述:3.5 DIGIT ADC, CMOS, 7126, DIP40 制造商:Microchip Technology Inc 功能描述:3.5 DIGIT ADC, CMOS, 7126, DIP40; Resolution (Bits):3.5bit; Supply Voltage Max:15V; Supply Current:55A; Digital IC Case Style:DIP; No. of Pins:40; Input Channel Type:Differential; Data Interface:Parallel; Operating Temperature ;RoHS Compliant: Yes |
| TC7126IPL | 功能描述:LCD 驱动器 Low Power RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TC7126RCPL | 功能描述:LCD 驱动器 Low Power RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TC7126RIPL | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:3-1/2 Digit Analog-to-Digital Converters |
发布紧急采购，3分钟左右您将得到回复。