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參數(shù)資料
| 型號(hào)： | TC820CKW |
| 元件分類： | ADC |
| 英文描述： | 1-CH DUAL-SLOPE ADC, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁數(shù)： | 27/28頁 |
| 文件大小： | 616K |
| 代理商： | TC820CKW |
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TC820
DS21476B-page 8
2002 Microchip Technology Inc.
3.0
DETAILED DESCRIPTION
The TC820 is a 3-3/4 digit measurement system com-
bining an integrating analog-to-digital converter, fre-
quency counter, and logic level tester in a single
package. The TC820 supersedes the TC7106 in new
designs by improving performance and reducing sys-
tem cost. The TC820 adds features that are difficult,
expensive, or impossible to provide with older A/D con-
verters (see Table 3-1). The high level of integration
permits TC820 based instruments to deliver higher per-
formance and more features, while actually reducing
parts count. Fabricated in low power CMOS, the TC820
directly drives a 3-3/4 digit (3999 maximum) LCD.
With a maximum range of 3999 counts, the TC820 pro-
vides 10 times greater resolution in the 200mV to
400mV range than traditional 3-1/2 digit meters. An
auto-zero cycle ensures a zero reading with a 0V input.
CMOS processing reduces analog input bias current to
only 1pA. Rollover error (the difference in readings for
equal magnitude but opposite polarity input signals) is
less than ±1 count. Differential reference inputs permit
ratiometric measurements for ohms or bridge trans-
ducer applications.
The TC820's frequency counter option simplifies
design of an instrument well-suited to both analog and
digital troubleshooting: voltage, current, and resistance
measurements, plus precise frequency measurements
to 4MHz (higher frequencies can be measured with an
external prescaler), and a simple logic probe. The fre-
quency counter will automatically adjust its range to
match the input frequency, over a four-decade range.
Two logic level measurement inputs permit a TC820
based meter to function as a logic probe. When com-
bined with external level shifters, the TC820 will display
logic levels on the LCD and also turn on a piezoelectric
buzzer when the measured logic level is low.
Other TC820 features simplify instrument design and
reduce parts count. On-chip decimal point drivers are
included, as is a low battery detection annunciator. A
piezoelectric buzzer can be controlled with an external
switch or by the logic probe inputs. Two oscillator
options are provided: a crystal can be used if high accu-
racy frequency measurements are desired, or a simple
RC option can be used for low-end instruments.
A "peak reading hold" input allows the TC820 to retain
the highest A/D or frequency reading. This feature is
useful in measuring motor starting current, maximum
temperature, and similar applications.
A family of instruments can be created with the TC820.
No additional design effort is required to create instru-
ments with 3-3/4 digit resolution.
The TC820 operates from a single 9V battery, with typ-
ical power of 10mW. Packages include a 40-pin plastic
DIP, 44-pin plastic flat package (PQFP), and 44-pin
PLCC.
TABLE 3-1:
COMPETITIVE EVALUATION
3.1
General Theory of Operation
3.1.1
DUAL SLOPE CONVERSION
PRINCIPLES
The TC820 analog-to-digital converter operates on the
principle of dual slope integration. An understanding of
the dual slope conversion technique will aid the user in
following the detailed TC820 theory of operation follow-
ing this section. A conventional dual slope converter
measurement cycle has two distinct phases:
1.
Input Signal Integration
2.
Reference Voltage Integration (De-integration)
Referring to Figure 3-1, the unknown input signal to be
converted is integrated from zero for a fixed time period
(tINT), measured by counting clock pulses. A constant
reference voltage of the opposite polarity is then inte-
grated until the integrator output voltage returns to
zero. The reference integration (de-integration) time
(tDEINT) is then directly proportional to the unknown
input voltage (VIN).
Features Comparison
TC820
7106
3-3/4 Digit Resolution
Yes
No
Auto-Ranging Frequency
Counter
Yes
No
Logic Probe
Yes
No
Decimal Point Drive
Yes
No
Peak Reading Hold
(Frequency or Voltage)
Yes
No
Display Hold
Yes
No
Simple 10:1 Range Change
Yes
No
Buzzer Drive
Yes
No
Low Battery Detection
with Annunciator
Yes
No
Over Range Detection
with Annunciator
Yes
No
Low Drift Reference
Yes
No
Under Range/Over Range
Logic Output
Yes
No
Input Overload Display
"OL"
"1"
LCD Annunciator Driver
Yes
No
LCD Drive Type
Triplexed
Direct
LCD Pin Connections
15
24
LCD Elements
36
23
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TC820CLW | 1-CH DUAL-SLOPE ADC, PQCC44 |
| TC820CPL | 1-CH DUAL-SLOPE ADC, PDIP40 |
| TC820CLW | DUAL-SLOPE ADC, PARALLEL ACCESS, PQCC44 |
| TC820CPL | DUAL-SLOPE ADC, PARALLEL ACCESS, PDIP40 |
| TC821CKW | CONVERTER SUBSYSTEM ADC, PARALLEL ACCESS, PQFP44 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC820CKW713 | 功能描述:LCD 驅(qū)動(dòng)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(shí)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 |
| TC820CLW | 功能描述:LCD 驅(qū)動(dòng)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(shí)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 |
| TC820CLW713 | 功能描述:LCD 驅(qū)動(dòng)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(shí)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 |
| TC820CPL | 功能描述:LCD 驅(qū)動(dòng)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(shí)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 |
| TC8-20S2405R | 制造商:TRUMPOWER 制造商全稱:Tumbler Technologies + TRUMPower 功能描述:DC/DC CONVERTERS 2:1 Input, 12.5 to 20 Watt |
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