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参数资料
| 型号： | ICL7136CM44Z |
| 厂商： | Intersil |
| 文件页数： | 11/15页 |
| 文件大小： | 0K |
| 描述： | IC ADC 3.5DIGIT LOW PWR 44-MQFP |
| 标准包装： | 96 |
| 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 |
| 电源电压： | 9V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-QFP |
| 供应商设备封装： | 44-MQFP（10x10） |
| 包装： | 托盘 |
ICL7136
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,
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 0.662V. Instead of dividing the input down to
200mV, the designer should use the input voltage directly
Typical Applications
The ICL7136 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.
Application Notes
and select V REF = 0.341V. Suitable values for integrating
resistor and capacitor would be 330k ? and 0.047 μ F. 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.
TO PIN 1
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”
OSC 1 40
OSC 2 39
180k ?
OSC 1 40
180k ?
TO PIN 1
OSC 3 38
TEST 37
REF HI 36
50pF
SET V REF
= 100mV
OSC 2 39
OSC 3 38
TEST 37
50pF
SET V REF
= 100mV
REF LO 35
C REF 34
C REF 33
COMMON 32
IN HI 31
IN LO 30
A-Z 29
BUFF 28
INT 27
V - 26
G2 25
C3 24
A3 23
G3 22
BP 21
20k ? 240k ?
0.1 μ F
1M ?
0.01 μ F
0.47 μ F
180k ?
0.047 μ F
TO DISPLAY
TO BACKPLANE
+
IN
-
+
9V
-
REF HI 36
REF LO 35
C REF 34
C REF 33
COMMON 32
IN HI 31
IN LO 30
A-Z 29
BUFF 28
INT 27
V - 26
G2 25
C3 24
A3 23
G3 22
BP/GND 21
0.1 μ F
0.01 μ F
1.8M
0.047 μ F
TO DISPLAY
250k ? 240k ?
1M ?
0.01 μ F
+
-
V+
IN
V-
Values shown are for 200mV full scale, 3 readings/sec., floating
supply voltage (9V battery).
FIGURE 8. ICL7136 USING THE INTERNAL REFERENCE
11
FIGURE 9. RECOMMENDED COMPONENT VALUES FOR 2V
FULL SCALE
FN3086.6
July 21, 2005
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