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參數(shù)資料
| 型號： | TC818A |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Auto-Ranging Analog-to-Digital Converter with 3-1/2 Digit Display |
| 中文描述： | 自動測距模擬到數(shù)字轉(zhuǎn)換器與數(shù)字顯示3-1/2 |
| 文件頁數(shù)： | 6/24頁 |
| 文件大?。?/td> | 583K |
| 代理商： | TC818A |
TC818A
DS21475B-page 6
2002 Microchip Technology Inc.
3.0
DETAILED DESCRIPTION
3.1
Analog-to-Digital Converter (ADC)
The TC818A includes an integrating ADC with auto-
ranging resolution of 2000 counts and manual range
resolution of 3000 counts. Figure 3-1 shows a simpli-
fied schematic of the analog section. In Auto-Ranging
mode, internal logic will adjust the input voltage or
ohms attenuators so that measurements will always be
made in the appropriate range.
Measurement ranges, logic control inputs, 3-1/2 digit
LCD formatting, and other features are identical to the
TC818A auto-ranging A/D converter. However, the
TC818A is not pin compatible with, and is not a replace-
ment for, the TC818A.
A display annunciator output (ANNUNC) can be used
to customize the LCD. ANNUNC is a square wave at
the backplane frequency. Connecting an annunciator
segment to the ANNUNC driver turns the segment on;
connecting the segment to its backplane turns it off.
37
38
39
40
41
42
43
44
45
46
47
R3
R4
R5
VR3
VR2
VR5
VR4
V
I
I
I
ACVL
C
I
Standard resistor connection for 20k
full scale range.
Standard resistor connection for 200k
full scale range.
Standard resistor connection for 2000k
full scale.
Voltage measurement
÷ 100 attenuator.
Voltage measurement ÷ 10 attenuator.
Voltage measurement ÷ 10,000 attenuator.
Voltage measurement ÷ 1000 attenuator.
Unknown voltage input ÷ attenuator.
Unknown current input.
Low output of AC-to-DC converter.
Integrator capacitor connection. Nominally 0.1
μ
F. (Must have low dielectric absorption.
Polypropylene dielectric suggested.)
No connection.
Auto-zero capacitor connection. Nominally 0.1
μ
F.
Unknown resistance input.
Input filter connection.
Negative input of internal AC-to-DC operational amplifier.
Output of internal AC-to-DC operational amplifier.
Active buffer output for resistance measurement. Integration resistor connection.
Nominally 220k
.
Active buffer output for voltage and current measurement. Integration resistor connection.
Nominally 15k
.
Positive output of AC-to-DC converter.
Negative supply connection. Connect to negative terminal of 9V battery.
Internal logic digital ground. Ground connection for the logic "0" level.
Nominally 4.7V below V
CC
.
Input to set manual operation and change ranges.
Input to hold display. Connect to DGND to "FREEZE" display.
Input to enter Memory Measurement mode for relative measurements. The two LSDs are
stored and subtracted from future measurements.
Input that selects AC or DC option during voltage/current measurements. For resistance
measurements, the ohms or low power (voltage) ohms option can be selected.
Input to select measurement. Connect to logic "0" (digital ground) for current measurement.
No connection.
48
49
50
51
52
53
54
NC
C
AZ
R
X
CFI
ADI
ADO
R
BUF
55
RVIBUF
56
57
58
ACVH
V
SS
DGND
59
60
61
RANGE
HOLD
-MEM
62
DC(
)/
AC(LO
)
I
NC
63
64
TABLE 2-1:
PIN FUNCTION TABLE (CONTINUED)
Pin Number
(64-Pin PQFP)
Symbol
Description
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| TC818 | Auto-Ranging Analog-to-Digital Converter with 3-1/2 Digit Display |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC818ACBU | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Auto-Ranging Analog-to-Digital Converter with 3-1/2 Digit Display |
| TC-819-SC | 制造商:Thomas & Betts 功能描述: |
| TC820 | 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:3-3/4 DIGIT A/D CONVERTER WITH FREQUENCY COUNTER AND LOGIC PROBE |
| TC820CKW | 功能描述:LCD 驅(qū)動器 3-3/4 A/D Converter RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TC820CKW713 | 功能描述:LCD 驅(qū)動器 3-3/4 A/D Converter RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
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