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参数资料
| 型号： | ICL7126CPLZ |
| 厂商： | Intersil |
| 文件页数： | 8/15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
V+
V+
V+
1M ?
TO LCD
BP
ICL7126
DECIMAL
POINT
ICL7126
DECIMAL
POINT
SELECT
TO LCD
DECIMAL
POINTS
BP
21
TEST
37
TO LCD
BACKPLANE
TEST
V+ = DP ON
GND = DP OFF
CD4030
GND
FIGURE 6. SIMPLE INVERTER FOR FIXED
DECIMAL POINT
TEST
The TEST pin serves two functions. It is coupled to the
internally generated digital supply through a 500 ? resistor.
Thus it can be used as the negative supply for externally
generated segment drivers such as decimal points or any
other presentation the user may want to include on the LCD
display. Figures 6 and 7 show such an application. No more
than a 1mA load should be applied.
The second function is a “lamp test”. When TEST is pulled
high (to V+) all segments will be turned on and the display
should read “-1888”. The TEST pin will sink about 10mA
under these conditions.
CAUTION: In the lamp test mode, the segments have a constant DC volt-
age (no square-wave) and may burn the LCD display if left in this mode for
several minutes.
Digital Section
Figure 8 shows the digital section for the ICL7126. An internal
digital ground is generated from a 6V Zener diode and a large
P-Channel source follower. This supply is made stiff to absorb
the relative large capacitive currents when the back plane (BP)
voltage is switched. The BP frequency is the clock frequency
divided by 800. For three readings/second this is a 60Hz
square wave with a nominal amplitude of 5V. The segments are
driven at the same frequency and amplitude and are in phase
with BP when OFF, but out of phase when ON. In all cases
negligible DC voltage exists across the segments. The polarity
indication is “ON” for negative analog inputs. If IN LO and IN HI
are reversed, this indication can be reversed also, if desired.
System Timing
Figure 9 shows the clocking arrangement used in the
ICL7126. Two basic clocking arrangements can be used:
Figure 9A, an external oscillator connected to pin 40.
Figure 9B, an R-C oscillator using all three pins.
The oscillator frequency is divided by four before it clocks the
decade counters. It is then further divided to form the three
convert-cycle phases. These are signal integrate (1000 counts),
reference de-integrate (0 to 2000 counts) and auto-zero (1000
8
FIGURE 7. EXCLUSIVE ‘OR’ GATE FOR
DECIMAL POINT DRIVE
to 3000 counts). For signals less than full-scale, auto-zero gets
the unused portion of reference de-integrate. This makes a
complete measure cycle of 4,000 counts (16,000 clock pulses)
independent of input voltage. For three readings/second, an
oscillator frequency of 48kHz would be used.
To achieve maximum rejection of 60Hz pickup, the signal
integrate cycle should be a multiple of 60Hz. Oscillator
frequencies of 60kHz, 48kHz, 40kHz, 33 1 / 3 kHz, etc. should
be selected. For 50Hz rejection, oscillator frequencies of
66 2 / 3 kHz, 50kHz, 40kHz, etc. would be suitable. Note that
40kHz (2.5 readings/sec.) will reject both 50Hz and 60Hz
(also 400Hz and 440Hz).
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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