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参数资料
| 型号： | ADC0820 |
| 厂商： | National Semiconductor Corporation |
| 英文描述： | 8-Bit High Speed μP Compatible A/D Converter with Track/Hold Function(8位高速μP兼容A/D转换器带跟踪/保持功能) |
| 中文描述： | CMOS、高速、8位A/D转换器，带有采样/保持功能 |
| 文件页数： | 11/22页 |
| 文件大小： | 472K |
| 代理商： | ADC0820 |
1.0 Functional Description
(Continued)
sured while WR is low. In RD mode, sampling occurs during
the first 800 ns of RD. Because of the input connections to
the ADC0820’s LS and MS comparators, the converter has
the ability to sample V
at one instant (Section 2.4), despite
the fact that two separate 4-bit conversions are being done.
More specifically, when WR is low the MS flash is in compare
mode (connected to V
IN
), and the LS flash is in zero mode
(also connected to V
IN
). Therefore both flash ADCs sample
V
IN
at the same time.
1.4 DIGITAL INTERFACE
The ADC0820 has two basic interface modes which are se-
lected by strapping the MODE pin high or low.
RD Mode
With the MODE pin grounded, the converter is set to Read
mode. In this configuration, a complete conversion is done
by pulling RD low until output data appears. An INT line is
provided which goes low at the end of the conversion as well
as a RDY output which can be used to signal a processor
that the converter is busy or can also serve as a system
Transfer Acknowledge signal.
When in RD mode, the comparator phases are internally trig-
gered.At the falling edge of RD, the MS flash converter goes
from zero to compare mode and the LS ADC’s comparators
enter their zero cycle. After 800 ns, data from the MS flash is
latched and the LS flashADC enters compare mode. Follow-
ing another 800 ns, the lower 4 bits are recovered.
WR then RD Mode
With the MODE pin tied high, the A/D will be set up for the
WR-RD mode. Here, a conversion is started with the WR in-
put; however, there are two options for reading the output
data which relate to interface timing. If an interrupt driven
scheme is desired, the user can wait for INT to go low before
reading the conversion result (Figure 10 ). INT will typically
go low 800 ns after WR’s rising edge. However, if a shorter
conversion time is desired, the processor need not wait for
INT and can exercise a read after only 600 ns (Figure 9 ). If
this is done, INT will immediately go low and data will appear
at the outputs.
Stand-Alone
For stand-alone operation in WR-RD mode, CS and RD can
be tied low and a conversion can be started with WR. Data
will be valid approximately 800 ns following WR’s rising
edge.
RD Mode (Pin 7 is Low)
DS005501-16
DS005501-17
FIGURE 9. WR-RD Mode (Pin 7 is High and t
RD
<
t
I
)
DS005501-18
FIGURE 10. WR-RD Mode (Pin 7 is High and t
RD
>
t
I
)
WR-RD Mode (Pin 7 is High) Stand-Alone Operation
DS005501-19
www.national.com
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADC0820 WAF | 制造商:Texas Instruments 功能描述: |
| ADC08200 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:8-Bit, 20 Msps to 200 Msps, Low Power A/D Converter with Internal Sample-and-Hold |
| ADC08200_08 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:8-Bit, 20 Msps to 200 Msps, Low Power A/D Converter with Internal Sample-and-Hold |
| ADC08200CIMT | 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 |
| ADC08200CIMT/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 |
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