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| 型号： | ICL7126CPLZ |
| 厂商： | Intersil |
| 文件页数： | 6/15页 |
| 文件大小： | 0K |
| 描述： | IC ADC 3.5DIGIT LCD LP 40DIP |
| 标准包装： | 9 |
| 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： | 70µA |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 40-DIP（0.600"，15.24mm） |
| 供应商设备封装： | 40-DIP |
| 包装： | 管件 |
| 产品目录页面： | 1236 (CN2011-ZH PDF) |
ICL7126
Detailed Description
Analog Section
Figure 4 shows the Functional Diagram of the Analog
Section for the ICL7126. Each measurement cycle is divided
into three phases. They are (1) auto-zero (A-Z), (2) signal
integrate (INT) and (3) de-integrate (DE).
Auto-Zero Phase
During auto-zero three things happen. First, input high and
low are disconnected from the pins and internally shorted to
analog COMMON. Second, the reference capacitor is
charged to the reference voltage. Third, a feedback loop is
closed around the system to charge the auto-zero capacitor
C AZ to compensate for offset voltages in the buffer amplifier,
integrator, and comparator. Since the comparator is included
in the loop, the A-Z accuracy is limited only by the noise of
the system. In any case, the offset referred to the input is
less than 10 μ V.
Signal Integrate Phase
During signal integrate, the auto-zero loop is opened, the
internal short is removed, and the internal input high and low
are connected to the external pins. The converter then
integrates the differential voltage between IN HI and IN LO
for a fixed time. This differential voltage can be within a wide
common mode range: up to 1V from either supply. If, on the
other hand, the input signal has no return with respect to the
converter power supply, IN LO can be tied to analog
COMMON to establish the correct common mode voltage. At
the end of this phase, the polarity of the integrated signal is
determined.
C REF
De-integrate Phase
The final phase is de-integrate, or reference integrate. Input
low is internally connected to analog COMMON and input
high is connected across the previously charged reference
capacitor. Circuitry within the chip ensures that the capacitor
will be connected with the correct polarity to cause the
integrator to output to return to zero. The time required for
the output to return to zero is proportional to the input signal.
Specifically, the digital reading displayed is:
? V IN ?
Display Count = 1000 ? --------------- ? .
? V REF ?
Differential Input
The input can accept differential voltages anywhere within
the common mode range of the input amplifier, or specifically
from 0.5V below the positive supply to 1V above the negative
supply. In this range, the system has a CMRR of 86dB
typical. However, care must be exercised to assure the
integrator output does not saturate. A worst case condition
would be a large positive common mode voltage with a near
full-scale negative differential input voltage. The negative
input signal drives the integrator positive when most of its
swing has been used up by the positive common mode
voltage. For these critical applications the integrator output
swing can be reduced to less than the recommended 2V full
scale swing with little loss of accuracy. The integrator output
can swing to within 0.5V of either supply without loss of
linearity.
R INT
C AZ
C INT
C REF+
REF HI
REF LO
C REF -
BUFFER V+
A-Z
INT
V+
34
36
35
33
28
1
29
27
31
1 μ A
A-Z
A-Z
-
+
2.8V
INTEGRATOR
-
+
+
TO
DIGITAL
SECTION
IN HI
INT
DE-
DE+
INPUT
6.2V
A-Z
HIGH
A-Z
32
DE+
DE-
N
+
-
COMPARATOR
COMMON
IN LO
30
INT
A-Z AND DE (±)
26
INPUT
LOW
V-
FIGURE 4. ANALOG SECTION OF ICL7126
6
FN3084.5
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICL7126CQ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog-to-Digital Converter， 3-1/2-Digit |
| ICL7126CQH | 制造商:Maxim Integrated Products 功能描述:1-CH 16-BIT DUAL-SLOPE ADC, PARALLEL ACCESS, PQCC44 |
| ICL7126CQH+D | 功能描述:模数转换器 - ADC 3-1/2 Digit ADC w/ Direct LCD Dsp Hold 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 |
| ICL7126CQH+TD | 功能描述:模数转换器 - ADC 3-1/2 Digit ADC w/ Direct LCD Dsp Hold 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 |
| ICL7126CQH-D | 功能描述:模数转换器 - ADC 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 |
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