- 您现在的位置：买卖IC网 > PDF目录98168 > TC14433COG 1-CH 3-BIT DUAL-SLOPE ADC, SERIAL ACCESS, PDSO24 PDF资料下载
参数资料
| 型号： | TC14433COG |
| 元件分类： | ADC |
| 英文描述： | 1-CH 3-BIT DUAL-SLOPE ADC, SERIAL ACCESS, PDSO24 |
| 封装： | SOIC-24 |
| 文件页数： | 19/20页 |
| 文件大小： | 356K |
| 代理商： | TC14433COG |
TC14433/A
DS21394C-page 8
2006 Microchip Technology Inc.
4.0
DETAILED DESCRIPTION
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
chip. Refer to the Functional Block diagram, Figure .
Features of the TC14433/A include auto-zero, high
input impedances and auto-polarity. Low power
consumption and a wide range of power supply volt-
ages are also advantages of this CMOS device. The
system’s auto-zero function compensates for the offset
voltage of the internal amplifiers and comparators. In
this “ratiometric system,” the output reading is 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. Figure shows the conversion
cycle in 6 segments for both positive and negative
inputs.
i
FIGURE 4-1:
Integrator Waveforms at Pin 6
Segment 1 – The offset capacitor (CO), which compen-
sates for the input offset voltages of the buffer and inte-
grator 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 (VX as the input to the
integrator.
shows
the
equivalent
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.
FIGURE 4-2:
Equivalent Circuit Diagrams
of the Analog Section During Segment 4 of the
Timing Cycle
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
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.
Start
1
2
3
4
5
6
Typical
Positive
Input Voltage
Typical
Negative
Input Voltage
Time
Segment
Number
End
VX
C1
Comparator
R1
Buffer
Integrator
+
–
+
–
+
–
VX
相关PDF资料 |
PDF描述 |
|---|---|
| TC14433AEPG | 1-CH 3-BIT DUAL-SLOPE ADC, SERIAL ACCESS, PDIP24 |
| TC14433EPG | 1-CH 3-BIT DUAL-SLOPE ADC, SERIAL ACCESS, PDIP24 |
| TC14433ELITR | 1-CH 3-BIT DUAL-SLOPE ADC, SERIAL ACCESS, PQCC28 |
| TC14433AEP | 1-CH 3-BIT DUAL-SLOPE ADC, SERIAL ACCESS, PDIP24 |
| TC14433EP | 1-CH 3-BIT DUAL-SLOPE ADC, SERIAL ACCESS, PDIP24 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TC14433COG713 | 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 |
| TC14433-E/LI | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:3-1/2 Digit, Analog-to-Digital Converter |
| TC14433-E/OG | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:3-1/2 Digit, Analog-to-Digital Converter |
| TC14433-E/PG | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:3-1/2 Digit, Analog-to-Digital Converter |
| TC14433EJ | 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 |
发布紧急采购，3分钟左右您将得到回复。