- 您现在的位置：买卖IC网 > PDF目录20141 > TC820CPL (Microchip Technology)IC ADC 3 3/4DGT LGC PROBE 40DIP PDF资料下载
参数资料
| 型号： | TC820CPL |
| 厂商： | Microchip Technology |
| 文件页数： | 13/34页 |
| 文件大小： | 0K |
| 描述： | IC ADC 3 3/4DGT LGC PROBE 40DIP |
| 标准包装： | 10 |
| 显示器类型： | LCD |
| 配置： | 7 段 + 2 个信号器 |
| 数字或字符： | A/D，3.75 位数字 |
| 电流 - 电源： | 1mA |
| 电源电压： | 9V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 40-DIP（0.600"，15.24mm） |
| 供应商设备封装： | 40-PDIP |
| 包装： | 管件 |
| 产品目录页面： | 673 (CN2011-ZH PDF) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页当前第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页
TC820
When the logic probe function is selected while FREQ/
VOLTS is low (A/D mode), the ADC will remain in the
Auto-Zero mode. The LCD will read "OL" and all
decimal points will be off ( Figure ).
To prevent rollover type errors from being induced by
large Common mode voltages, C REF should be large
compared to stray node capacitance. A 0.1 μF
capacitor is typical.
The TC820 offers a significantly improved analog
High
Low
*
**
common temperature coefficient, providing a very
stable voltage suitable for use as a voltage reference.
The temperature coefficient of analog common is
typically 35 ppm/°C.
* "High" Annuciator will be on when DP1/HI = Logic High
3.5.3
ANALOG COMMON
** "Low" Annunciator and Buzzer will be on when DP0/LO = Logic High
The analog common pin is set at a voltage potential
FIGURE 3-6:
LCD Reading.
approximately 3.3V below V DD . This potential is
If the logic probe is active while FREQ/VOLTS is high
(Counter mode), the frequency counter will continue to
operate. The display will read "OL" but the decimal
points will be visible. If the logic probe input is also
connected to the RANGE/FREQ input, bringing the
LOGIC input low will immediately display the frequency
at the logic probe input.
between 3.15V and 3.45V below V DD . Analog common
is tied internally to an N-channel FET capable of sink-
ing 3 mA. This FET will hold the common line at 3.3V
below V DD should an external load attempt to pull the
common line toward V DD . Analog common source
current is limited to 12 μA, and is, therefore, easily
pulled to a more negative voltage (i.e., below V DD –
3.3V).
3.5
3.5.1
Analog Pin Functional Description
DIFFERENTIAL SIGNAL INPUTS
(V IN +), (V IN -)
The TC820 connects the internal V IN + and V IN - inputs
to analog common during the auto-zero cycle. During
the reference integrate phase, V IN - is connected to
analog common. If V IN - is not externally connected to
analog common, a Common mode voltage exists.
The TC820 is designed with true differential inputs, and
accepts input signals within the Input Stage Common
mode voltage (V CM ) range. The typical range is
V DD – 1V to V SS + 1.5V. Common mode voltages are
removed from the system when the TC820 operates
from a battery or floating power source (isolated from
measured system) and V SS is connected to analog
common (see Figure 3-5 ).
In systems where Common mode voltages exist, the
86 dB Common mode rejection ratio minimizes error.
Common mode voltages do, however, affect the
integrator output level. A worst case condition exists if
a large, positive V CM exists in conjunction with a full
scale, negative differential signal. The negative signal
drives the integrator output positive along with V CM
output swing can be reduced below the recommended
2V full scale swing. The integrator output will swing
within 0.3V of V DD , or V DD without increased linearity
error.
This is rejected by the converter's 86 dB Common
mode rejection ratio. In battery powered applications,
analog common and V IN - are usually connected,
removing Common mode voltage concerns. In systems
where V IN - is connected to the power supply ground or
to a given voltage, analog common should be
connected to V IN -.
The analog common pin serves to set the analog
section reference or common point. The TC820 is
specifically designed to operate from a battery, or in
any “measurement" system where input signals are not
referenced (float), with respect to the TC820 power
source. The analog common potential of V DD – 3.3V
gives a 7V end of battery life voltage. The analog
common potential has a voltage coefficient of 0.001%.
With a sufficiently high total supply voltage
(V DD – V SS > 7V), analog common is a very stable
potential with excellent temperature stability (typically
35ppm/°C). This potential can be used to generate the
TC820 reference voltage. An external voltage
3.5.2
REFERENCE (V DD , V SS )
reference will be unnecessary in most cases, because
The TC820 reference, like the analog signal input, has
true differential inputs. In addition, the reference
voltage can be generated anywhere within the power
supply voltage of the converter. The differential
reference inputs permit ratiometric measurements and
simplify interfacing with sensors, such as load cells and
temperature sensors.
? 2007 Microchip Technology Inc.
of the 35 ppm/°C temperature coefficient. See the
applications section for details.
DS21476C-page 13
相关PDF资料 |
PDF描述 |
|---|---|
| VI-23X-CX-F1 | CONVERTER MOD DC/DC 5.2V 75W |
| RMM30DTAI | CONN EDGECARD 60POS R/A .156 SLD |
| HBC07DRTS-S13 | CONN EDGECARD 14POS .100 EXTEND |
| EMM40DTKT-S288 | CONN EDGECARD 80POS .156 EXTEND |
| T95R107M025HSAS | CAP TANT 100UF 25V 20% 2824 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TC8-20S2405R | 制造商:TRUMPOWER 制造商全称:Tumbler Technologies + TRUMPower 功能描述:DC/DC CONVERTERS 2:1 Input, 12.5 to 20 Watt |
| TC8-20S4805R | 制造商:TRUMPOWER 制造商全称:Tumbler Technologies + TRUMPower 功能描述:DC/DC CONVERTERS 2:1 Input, 12.5 to 20 Watt |
| TC-821-SC | 制造商:Thomas & Betts 功能描述:Cable Accessories Thin Wall Conduit Fitting Zinc Die Cast |
| TC821-SC-1 | 制造商:Thomas & Betts 功能描述:1/2 CONN,SSCREW,EMT,DC,INSUL,EA 制造商:Thomas & Betts 功能描述:ADVANTAGES OF STEEL CITY COMMERCIAL CONDUIT FITTINGS |
| TC821-SC-10 | 制造商:Thomas & Betts 功能描述:Fittings Connector 0.5inch Insulated |
发布紧急采购，3分钟左右您将得到回复。