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| 型号： | ICL7135CPI |
| 厂商： | Intersil |
| 文件页数： | 9/15页 |
| 文件大小： | 0K |
| 描述： | IC CONV A/D 4 1/2 DIGIT 28-DIP |
| 标准包装： | 13 |
| 系列： | * |
| 其它名称： | ICL7135CPIIS NT5015 |
ICL7135
Power Supplies
The ICL7135 is designed to work from ± 5V supplies.
However, in selected applications no negative supply is
required. The conditions to use a single +5V supply are:
1. The input signal can be referenced to the center of the
common mode range of the converter.
2. The signal is less than ± 1.5V.
See “differential input” for a discussion of the effects this will
have on the integrator swing without loss of linearity.
Typical Applications
The circuits which follow show some of the wide variety of
possibilities and serve to illustrate the exceptional versatility
of this A/D converter.
Figure 7 shows the complete circuit for a 4 1 / 2 digit ( ± 2.000V)
full scale) A/D with LED readout using the ICL8069 as a
1.2V temperature compensated voltage reference. It uses
the band-gap principal to achieve excellent stability and low
noise at reverse currents down to 50 μ A. The circuit also
shows a typical R-C input filter. Depending on the
application, the time-constant of this filter can be made
faster, slower, or the filter deleted completely. The 1 / 2 digit
LED is driven from the 7 segment decoder, with a zero
reading blanked by connecting a D5 signal to RBl input of
+5V
the decoder. The 2-gate clock circuit should use CMOS
gates to maintain good power supply rejection.
A suitable circuit for driving a plasma-type display is shown
in Figure 8. The high voltage anode driver buffer is made by
Dionics. The 3 AND gates and caps driving “BI” are needed
for interdigit blanking of multiple-digit display elements, and
can be omitted if not needed. The 2.5k Ω and 3k Ω resistors
set the current levels in the display. A similar arrangement
can be used with Nixie ? tubes.
The popular LCD displays can be interfaced to the outputs of
the ICL7135 with suitable display drivers, such as the
ICM7211A as shown in Figure 9. A standard CMOS 4030
QUAD XOR gate is used for displaying the 1 / 2 digit, the
polarity, and an “overrange” flag. A similar circuit can be
used with the ICL7212A LED driver and the ICM7235A
vacuum fluorescent driver with appropriate arrangements
made for the “extra” outputs. Of course, another full driver
circuit could be ganged to the one shown if required. This
would be useful if additional annunciators were needed. The
Figure shows the complete circuit for a 4 1 / 2 digit ( ± 2.000V)
A/D.
Figure 10 shows a more complicated circuit for driving LCD
displays. Here the data is latched into the ICM7211 by the
STROBE signal and “Overrange” is indicated by blanking the
4 full digits.
6.8k Ω
27 Ω
0.47 μ F
3 COMMON
STROBE 26
5 AZ IN
-5V
V REF =
1.000V
ICL8069 1
(NOTE 1)
2 10k Ω
ANALOG
GND
100k Ω 1 μ F
100k Ω
100K 1 μ F
SIGNAL
INPUT
0.1 μ F
1 V- ICL7135 UR 28
2 REF OR 27
ANALOG
8 RC2 BUSY 21
4 INT OUT R/H 25
DIG. GND 24
6 BUF OUT POL 23
7 RC1 CLOCK 22
9 INPUT LO D1 20
10 INPUT HI D2 19
150 Ω
150 Ω
4.7K
5
4
3
2
1
150 Ω
47K
A
B
C
D
E
F
G
+5V
7447
RBI
B1
B2
B4
B8
+5V
11 V+
12 D5
13 B1
14 B2
D3 18
D4 17
B8 16
B4 15
C
RC NETWORK
? OSC = 0.45/RC
R
NOTE:
1. For finer resolution on scale factor adjust, use a 10 turn pot or a small pot in series with
a fixed resistor.
FIGURE 7. 4 1 / 2 DIGIT A/D CONVERTER WITH A MULTIPLEXED COMMON ANODE LED DISPLAY
9
FN3093.4
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICL7135CPI+ | 功能描述:模数转换器 - ADC 4 1/2 Digit ADC w/ MUXd BCD Outputs 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 |
| ICL7135CPI+2 | 功能描述:模数转换器 - ADC 4 1/2 Digit ADC w/ MUXd BCD Outputs 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 |
| ICL7135CPI-2 | 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 |
| ICL7135CPI-2+ | 制造商:Maxim Integrated Products 功能描述:4 1/2-digit A/D converter,ICL7135CPI-2 |
| ICL7135CPIR2489 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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