- 您现在的位置：买卖IC网 > PDF目录378277 > ADC0802LCN (INTERSIL CORP) 8-Bit, Microprocessor- Compatible, A/D Converters PDF资料下载
参数资料
| 型号： | ADC0802LCN |
| 厂商： | INTERSIL CORP |
| 元件分类： | ADC |
| 英文描述： | 8-Bit, Microprocessor- Compatible, A/D Converters |
| 中文描述： | 1-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, CDIP20 |
| 封装： | CERDIP-20 |
| 文件页数： | 22/41页 |
| 文件大小： | 1118K |
| 代理商： | ADC0802LCN |
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页当前第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页第35页第36页第37页第38页第39页第40页第41页
Functional Description
(Continued)
2.5 Errors and Reference Voltage Adjustments
2.5.1 Zero Error
The zero of the A/D does not require adjustment. If the mini-
mum analog input voltage value, V
, is not ground, a
zero offset can be done. The converter can be made to out-
put 0000 0000 digital code for this minimum input voltage by
biasing the A/D V
() input at this V
value (see Appli-
cations section). This utilizes the differential mode operation
of the A/D.
The zero error of the A/D converter relates to the location of
the first riser of the transfer function and can be measured by
grounding the V
() input and applying a small magnitude
positive voltage to the V
(+) input. Zero error is the differ-
ence between the actual DC input voltage that is necessary
to just cause an output digital code transition from 0000 0000
to 0000 0001 and the ideal
1
2
LSB value (
1
2
LSB = 9.8 mV
for V
REF
/2=2.500 V
DC
).
2.5.2 Full-Scale
The full-scale adjustment can be made by applying a differ-
ential input voltage that is 1
1
2
LSB less than the desired ana-
log full-scale voltage range and then adjusting the magni-
tude of the V
/2 input (pin 9 or the V
supply if pin 9 is
not used) for a digital output code that is just changing from
1111 1110 to 1111 1111.
2.5.3 Adjusting for an Arbitrary Analog Input Voltage
Range
If the analog zero voltage of the A/D is shifted away from
ground (for example, to accommodate an analog input signal
that does not go to ground) this new zero reference should
be properly adjusted first. A V
(+) voltage that equals this
desired zero reference plus
1
2
LSB (where the LSB is calcu-
lated for the desired analog span, 1 LSB=analog span/256)
is applied to pin 6 and the zero reference voltage at pin 7
should then be adjusted to just obtain the 00
HEX
to 01
HEX
code transition.
The full-scale adjustment should then be made (with the
proper V
() voltage applied) by forcing a voltage to the
V
IN
(+) input which is given by:
where:
V
MAX
=The high end of the analog input range
and
V
=the low end (the offset zero) of the analog range.
(Both are ground referenced.)
The V
/2 (or V
) voltage is then adjusted to provide a
code change from FE
HEX
to FF
HEX
. This completes the ad-
justment procedure.
2.6 Clocking Option
The clock for the A/D can be derived from the CPU clock or
an external RC can be added to provide self-clocking. The
CLK IN (pin 4) makes use of a Schmitt trigger as shown in
Figure 8
DS005671-87
a) Analog Input Signal Example
DS005671-88
*
Add if V
REF
/2
≤
1 V
DC
with LM358 to draw 3 mA to ground.
b) Accommodating an Analog Input from
0.5V (Digital Out = 00
HEX
) to 3.5V
(Digital Out=FF
HEX
)
FIGURE 7. Adapting the A/D Analog Input Voltages to Match an Arbitrary Input Signal Range
A
www.national.com
22
相关PDF资料 |
PDF描述 |
|---|---|
| ADC0802LD | 8-Bit, Microprocessor- Compatible, A/D Converters |
| ADC0804 | 8-Bit, Microprocessor-Compatible A/D Converters |
| ADC08060 | 8-Bit, 20 MSPS to 60 MSPS, 1.3 mW/MSPS A/D Converter |
| ADC08060CIMT | 8-Bit, 20 MSPS to 60 MSPS, 1.3 mW/MSPS A/D Converter |
| ADC0806 | 8-Bit, 20 MSPS to 60 MSPS, 1.3 mW/MSPS A/D Converter |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADC0802LCN/A+ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog-to-Digital Converter， 8-Bit |
| ADC0802LCN/NOPB | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| ADC0802LCN-P | 功能描述:IC ADC 8BIT MPU COMPAT 20-DIP 制造商:texas instruments 系列:- 零件状态:最後搶購 位数:8 采样率（每秒）:10k 输入数:1 输入类型:差分 数据接口:并联 配置:ADC 无线电 - S/H:ADC:- A/D 转换器数:1 架构:SAR 参考类型:外部，电源 电压 - 电源，模拟:4.5 V ~ 6.3 V 电压 - 电源，数字:4.5 V ~ 6.3 V 特性:- 工作温度:- 基本零件编号:ADC0802 标准包装:18 |
| ADC0802LCV | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog-to-Digital Converter， 8-Bit |
| ADC0802LCWM | 制造商:Texas Instruments 功能描述: |
发布紧急采购，3分钟左右您将得到回复。