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參數(shù)資料
| 型號： | ICL7137 |
| 廠商： | Intersil Corporation |
| 元件分類： | 串行ADC |
| 英文描述： | 3 1/2 Digit LED, Low Power Display,A/D Converters(3 1/2 位用于低功耗LED的A/D轉(zhuǎn)換器) |
| 中文描述： | 低功耗、3 1/2位A/D轉(zhuǎn)換器 |
| 文件頁數(shù)： | 11/15頁 |
| 文件大?。?/td> | 497K |
| 代理商： | ICL7137 |
11
FN3086.6
July 21, 2005
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
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.
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
NOTE #
DESCRIPTION
AN016
“Selecting A/D Converters”
AN017
“The Integrating A/D Converter”
AN018
“Do’s and Don’ts of Applying A/D Converters”
AN023
“Low Cost Digital Panel Meter Designs”
AN032
“Understanding the Auto-Zero and Common Mode
Performance of the ICL7136/7/9 Family”
AN046
“Building a Battery-Operated Auto Ranging DVM with
the ICL7106”
AN052
“Tips for Using Single Chip 3
1
/
2
Digit A/D Converters”
FIGURE 8. ICL7136 USING THE INTERNAL REFERENCE
FIGURE 9. RECOMMENDED COMPONENT VALUES FOR 2V
FULL SCALE
28
40
39
38
37
36
35
34
33
32
31
30
29
27
26
25
24
23
22
21
OSC 1
OSC 2
OSC 3
TEST
REF HI
REF LO
C
REF
C
REF
COMMON
IN HI
IN LO
A-Z
BUFF
INT
V
-
G2
C3
A3
G3
BP
50pF
TO PIN 1
SET V
REF
= 100mV
0.1
μ
F
0.01
μ
F
1M
180k
20k
240k
IN
+
-
9V
180k
0.047
μ
F
0.47
μ
F
TO BACKPLANE
TO DISPLAY
Values shown are for 200mV full scale, 3 readings/sec., floating
supply voltage (9V battery).
+
-
28
40
39
38
37
36
35
34
33
32
31
30
29
27
26
25
24
23
22
21
OSC 1
OSC 2
OSC 3
TEST
REF HI
REF LO
C
REF
C
REF
COMMON
IN HI
IN LO
A-Z
BUFF
INT
V
-
G2
C3
A3
G3
BP/GND
50pF
TO PIN 1
SET V
REF
= 100mV
0.1
μ
F
0.01
μ
F
1M
180k
250k
240k
IN
+
-
1.8M
0.047
μ
F
0.01
μ
F
TO DISPLAY
V+
V-
ICL7136
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICL7137C/D | 功能描述:顯示驅(qū)動器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| ICL7137CDL | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ICL7137CJL | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ICL7137CM44 | 制造商:Rochester Electronics LLC 功能描述:44 PQFP, 0 + 70, 3 1/2 DIG A/D (LED DRIVE) - Bulk |
| ICL7137CMH | 制造商:Maxim Integrated Products 功能描述:LOW POWER, 3 1/2 DIGIT ADC WITH DIRECT LED DR - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
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