参数资料
| 型号： | ICL7126CPL |
| 厂商： | Intersil |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | IC ADC 3.5 DIGIT LCD LP 40-DIP |
| 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 |
| 其它名称： | ICL7126CPLIS |
ICL7126
Component Value Selection
Integrating Resistor
Both the buffer amplifier and the integrator have a class A
output stage with 6 μ A of quiescent current. They can
supply ~1 μ A of drive current with negligible nonlinearity.
The integrating resistor should be large enough to remain
in this very linear region over the input voltage range, but
small enough that undue leakage requirements are not
placed on the PC board. For 2V full-scale, 1.8M ? is near
optimum and similarly a 180k ? for a 200mV scale.
Integrating Capacitor
The integrating capacitor should be selected to give the
maximum voltage swing that ensures tolerance build-up will
not saturate the integrator swing (approximately. 0.3V from
either supply). When the analog COMMON is used as a
reference, a nominal ± 2V full-scale integrator swing is fine. For
three readings/second (48kHz clock) nominal values for C lNT
are 0.047 μ F, for 1/s (16kHz) 0.15 μ F. Of course, if different
oscillator frequencies are used, these values should be
changed in inverse proportion to maintain the same
output swing.
The integrating capacitor should have a low dielectric
absorption to prevent roll-over errors. While other types may
be adequate for this application, polypropylene capacitors
give undetectable errors at reasonable cost.
V REF should equal 100mV and 1V, respectively. However, in
many applications where the A/D is connected to a transducer,
there will exist a scale factor other than unity between the input
voltage and the digital reading. For instance, in a weighing
system, the designer might like to have a full-scale reading
when the voltage from the transducer is 0.682V. Instead of
dividing the input down to 200mV, the designer should use the
input voltage directly and select V REF = 0.341V. Suitable values
for integrating resistor 330k ? . This makes the system slightly
quieter and also avoids a divider network on the input. Another
advantage of this system occurs when a digital reading of zero
is desired for V IN ≠ 0. Temperature and weighing systems with
a variable fare are examples. This offset reading can be
conveniently generated by connecting the voltage transducer
between IN HI and COMMON and the variable (or fixed) offset
voltage between COMMON and IN LO.
Typical Applications
The ICL7126 may be used in a wide variety of
configurations. The circuits which follow show some of the
possibilities, and serve to illustrate the exceptional versatility
of these A/D converters.
The following application notes contain very useful
information on understanding and applying this part and are
available from Intersil Corporation.
Application Notes
f ～ ----------- ? For 48kHz clock (3 readings/sec), R = 180k ?
At three readings/sec, a 750 ? resistor should be placed in
series with the integrating capacitor, to compensate for
comparator delay.
Auto-Zero Capacitor
The size of the auto-zero capacitor has some influence on
the noise of the system. For 200mV full-scale where noise is
very important, a 0.32 μ F capacitor is recommended. On the
2V scale, a 0.33 μ F capacitor increases the speed of
recovery from overload and is adequate for noise on this
scale.
Reference Capacitor
A 0.1 μ F capacitor gives good results in most applications.
However, where a large common mode voltage exists (i.e.,
the REF LO pin is not at analog COMMON) and a 200mV
scale is used, a larger value is required to prevent roll-over
error. Generally 1 μ F will hold the roll-over error to 0.5 count
in this instance.
Oscillator Components
For all ranges of frequency a 50pF capacitor is recommended
and the resistor is selected from the approximation equation
0.45
RC
Reference Voltage
The analog input required to generate full-scale output (2000
counts) is: V lN = 2V REF . Thus, for the 200mV and 2V scale,
10
NOTE #
AN016
AN017
AN018
AN023
AN032
AN046
AN052
DESCRIPTION
“Selecting A/D Converters”
“The Integrating A/D Converter”
“Do’s and Don’ts of Applying A/D Converters”
“Low Cost Digital Panel Meter Designs”
“Understanding the Auto-Zero and Common Mode
Performance of the ICL7136/7/9 Family”
“Building a Battery-Operated Auto Ranging DVM with
the ICL7106”
“Tips for Using Single-Chip 3 1 / 2 Digit A/D Converters”
FN3084.5
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICL7126CPL+ | 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 |
| ICL7126CPL+3 | 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 |
| ICL7126CPL-3 | 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 |
| ICL7126CPLZ | 功能描述:LCD 驱动器 ADC 3 5 DIG LCD DRVR LWPWR COM 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 |
| 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 |
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