参数资料
| 型号： | TC14433ELI |
| 厂商： | Microchip Technology |
| 文件页数： | 8/24页 |
| 文件大小： | 0K |
| 描述： | IC ADC 3 1/2 DIGIT 28PLCC |
| 标准包装： | 39 |
| 显示器类型： | LED |
| 配置： | 7 段显示 |
| 接口： | BCD |
| 数字或字符： | A/D，3.5 位数字 |
| 电流 - 电源： | 1.8mA |
| 电源电压： | 4.5 V ~ 8 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-LCC（J 形引线） |
| 供应商设备封装： | 28-PLCC |
| 包装： | 管件 |
TC14433/A
4.0
DETAILED DESCRIPTION
Segment 1 – The offset capacitor (C O ), which compen-
sates for the input offset voltages of the buffer and
The TC14433 CMOS IC becomes a modified dual-
slope A/D with a minimum of external components.
This IC has the customary CMOS digital logic circuitry,
as well as CMOS analog circuitry. It provides the user
with digital functions such as (counters, latches,
multiplexers), and analog functions such as
(operational amplifiers and comparators) on a single
Features of the TC14433/A include auto-zero, high
input impedances and auto-polarity. Low power
consumption and a wide range of power supply
voltages are also advantages of this CMOS device.
The system’s auto-zero function compensates for the
offset voltage of the internal amplifiers and compara-
integrator amplifiers, is charged during this period.
However, the integrator capacitor is shorted. This
segment requires 4000 clock periods.
Segment 2 – During this segment, the integrator output
decreases to the comparator threshold voltage. At this
time, a number of counts equivalent to the input offset
voltage of the comparator is stored in the offset latches
for later use in the auto-zero process. The time for this
segment is variable and less than 800 clock periods.
Segment 3 – This segment of the conversion cycle is
the same as Segment 1.
Segment 4 – Segment 4 is an up going ramp cycle with
the unknown input voltage (V X as the input to the
tors. In this “ratiometric system,” the output reading is
integrator.
shows the equivalent
the ratio of the unknown voltage to the reference
voltage, where a ratio of 1 is equal to the maximum
count of 1999. It takes approximately 16,000 clock
periods to complete one conversion cycle. Each
conversion cycle may be divided into 6 segments.
configuration of the analog section of the TC14433.
The actual configuration of the analog section is
dependent upon the polarity of the input voltage during
the previous conversion cycle.
2
Typical
for both positive and negative inputs.
i
Start End
Time 5
1 3 4 6
Segment
V X
Number
V X
Buffer
–
+
R 1
C 1
Integrator
–
+
Comparator
+
–
Positive
Input Voltage
FIGURE 4-2: Equivalent Circuit Diagrams
of the Analog Section During Segment 4 of the
Timing Cycle
V X
Typical
Negative
Input Voltage
Segment 5 – This segment is a down-going ramp
period with the reference voltage as the input to the
integrator. Segment 5 of the conversion cycle has a
time equal to the number of counts stored in the offset
storage latches during Segment 2. As a result, the
FIGURE 4-1:
Pin 6.
DS21394D-page 8
Integrator Waveforms at
system zeros automatically.
Segment 6 – This is an extension of Segment 5. The
time period for this portion is 4000 clock periods. The
results of the A/D conversion cycle are determined in
this portion of the conversion cycle.
? 2008 Microchip Technology Inc.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC14433ELI713 | 功能描述:模数转换器 - ADC 3-1/2 Digit A/D BCD RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| TC14433EPG | 功能描述:模数转换器 - ADC 3-1/2 Digit A/D BCD RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| TC14433EPG | 制造商:Microchip Technology Inc 功能描述:IC ADC 3.5 DIGIT LED/LCD DISPLAY 制造商:Microchip Technology Inc 功能描述:IC, ADC, 3.5 DIGIT LED/LCD DISPLAY |
| TC14433EPG | 制造商:Microchip Technology Inc 功能描述:A/D Converter (A-D) IC |
| TC14433T | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:3-1/2 Digit, Analog-to-Digital Converter |
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