参数资料
| 型号： | AD673JNZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/8页 |
| 文件大小： | 0K |
| 描述： | IC ADC 8BIT REF/CLK/COMP 20DIP |
| 标准包装： | 18 |
| 位数： | 8 |
| 采样率（每秒）： | 33k |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 电压电源： | 双 ± |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 20-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 20-PDIP |
| 包装： | 管件 |
| 输入数目和类型： | 1 个单端，单极；1 个单端，双极 |
AD673
REV. A
–7–
In systems where this read-write interface is used, at least
30 microseconds (the maximum conversion time) must be al-
lowed to pass between starting a conversion and reading the re-
sults. This delay or “time-out” period can be implemented in a
short software routine such as a countdown loop, enough
dummy instructions to consume 30 microseconds, or enough
actual useful instructions to consume the required time. In tightly-
timed systems, the DR line may be read through an external
three-state buffer to determine precisely when a conversion is
complete. Higher-speed systems may choose to use DR to signal
an interrupt to the processor at the end of a conversion.
Figure 12. Typical AD673 Timing Diagram
CONVERT Pulse Generation
The AD673 is tested with a CONVERT pulse width of 500 ns
and will typically operate with a pulse as short as 300 ns. How-
ever, some microprocessors produce active WR pulses which are
shorter than this. Either of the circuits shown in Figure 13 can
be used to generate an adequate CONVERT pulse for the
AD673. In both circuits, the short low-going WR pulse sets the
CONVERT line high through a flip-flop. The rising edge of DR
(which signifies that the internal logic has been reset) resets
the flip-flop and brings CONVERT low, which starts the
conversion.
Note that tDSC is slightly longer when the result of the previous
conversion contains a Logic 1 on the LSB. This means that the
actual CONVERT pulse generated by the circuits in Figure 13
will vary slightly in width.
Figure 13a. Using 74LS00
Figure 13b. Using 1/2 74LS74
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相关代理商/技术参数 |
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|---|---|
| AD673JP | 制造商:Analog Devices 功能描述: |
| AD673SD | 制造商:Analog Devices 功能描述:ADC Single SAR 8-bit Parallel 20-Pin SBCDIP 制造商:Analog Devices 功能描述:ADC SGL SAR 8BIT PARALLEL 20PIN SBCDIP - Rail/Tube 制造商:Analog Devices Inc. 功能描述:Analog to Digital Converters - ADC 8-bit Successive Approx 制造商:Analog Devices 功能描述:CONVERTER - ADC |
| AD673SD/883B | 制造商:Analog Devices 功能描述:ADC Single SAR 8-bit Parallel 20-Pin SBCDIP 制造商:Rochester Electronics LLC 功能描述:IC - 8-BIT A/D CONVERTER - Bulk |
| AD673SD883B | 制造商:AD 功能描述:* |
| AD674 | 制造商:AD 制造商全称:Analog Devices 功能描述:Complete 12-Bit A/D Converters |
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