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| 型号： | TC7126CLW713 |
| 厂商： | Microchip Technology |
| 文件页数： | 14/26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
7.0
DEVICE PIN FUNCTIONAL
DESCRIPTION
Input
C I
(Pin Numbers Refer to the 40-Pin PDIP.)
+
+
Buffer
R I
–
[
[
tI
RI CI
t I = Integration time =
7.1 Differential Signal Inputs
V IN + (Pin 31), V IN - (Pin 30)
The TC7126A is designed with true differential inputs
and accepts input signals within the input stage
Common mode voltage range (V CM ). Typical range is
V+ – 1V to V- + 1V. Common mode voltages are
removed from the system when the TC7126A operates
V IN
–
V CM
–
+
Integrator
V I = V CM – V IN
Where:
4000
F OSC
C I = Integration capacitor
V I
from a battery or floating power source (isolated from
measured system), and V IN - is connected to analog
R I = Integration resistor
common (V COM ) (see Figure 7-2).
FIGURE 7-1:
Common Mode Voltage
In systems where Common mode voltages exist, the
TC7126A’s 86 dB Common mode rejection ratio
Reduces Available Integrator Swing (V COM ≠ V IN )
minimizes error. Common mode voltages do, however,
affect the integrator output level. A worst-case condi-
tion exists if a large positive V CM exists in conjunction
7.2
Differential Reference
V REF + (Pin 36), V REF - (Pin 35)
with a full scale negative differential signal. The
negative signal drives the integrator output positive
along with V CM (see Figure 7-1). For such applications,
the integrator output swing can be reduced below the
recommended 2V full scale swing. The integrator
output will swing within 0.3V of V+ or V- without
increased linearity error.
The reference voltage can be generated anywhere
within the V+ to V- power supply range.
To prevent rollover type errors being induced by large
Common mode voltages, C REF should be large
compared to stray node capacitance.
The TC7126A offers a significantly improved analog
common temperature coefficient. This potential
provides a very stable voltage, suitable for use as a ref-
erence. The temperature coefficient of analog common
is typically 35ppm/°C for the TC7126A and 80 ppm/°C
for the TC7126.
Segment
Drive
LCD
Measured
System
V BUFF
V IN +
C AZ
V INT
POL BP
OSC1
V+
V IN -
TC7126A
OSC3
V-
GND
ANALOG
COMMON V REF - V REF + V+
OSC2
V-
V+ V-
Power
GND
+
Source
9V
FIGURE 7-2:
DS21458C-page 14
Common Mode Voltage Removed in Battery Operation with V IN = Analog Common
? 2006 Microchip Technology Inc.
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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 |
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