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參數(shù)資料
| 型號： | ADC0804LCN |
| 廠商： | Intersil |
| 文件頁數(shù)： | 2/17頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 8-BIT 10KSPS 1LSB 20-DIP |
| 標(biāo)準(zhǔn)包裝： | 1,080 |
| 位數(shù)： | 8 |
| 采樣率（每秒）： | 10k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 電壓電源： | 單電源 |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 20-DIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 20-PDIP |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 1 個差分，單極 |
| 其它名稱： | ADC0804LCNIN ADC0804LCNIN-ND |
10
Such an adjusted reference voltage can accommodate a
reduced span or dynamic voltage range of the analog input
voltage. If the analog input voltage were to range from 0.5V to
3.5V, instead of 0V to 5V, the span would be 3V. With 0.5V
applied to the VlN(-) pin to absorb the offset, the reference
voltage can be made equal to 1/2 of the 3V span or 1.5V. The
A/D now will encode the VlN(+) signal from 0.5V to 3.5V with
the 0.5V input corresponding to zero and the 3.5V input
corresponding to full scale. The full 8 bits of resolution are
therefore applied over this reduced analog input voltage
range. The requisite connections are shown in Figure 13. For
expanded scale inputs, the circuits of Figures 14 and 15 can
be used.
Reference Accuracy Requirements
The converter can be operated in a pseudo-ratiometric mode
or an absolute mode. In ratiometric converter applications,
the magnitude of the reference voltage is a factor in both the
output of the source transducer and the output of the A/D
converter and therefore cancels out in the final digital output
code. In absolute conversion applicatIons, both the initial
value and the temperature stability of the reference voltage
are important accuracy factors in the operation of the A/D
converter. For VREF/2 voltages of 2.5V nominal value, initial
errors of
±10mV will cause conversion errors of ±1 LSB due
to the gain of 2 of the VREF/2 input. In reduced span
applications, the initial value and the stability of the VREF/2
input voltage become even more important. For example, if
the span is reduced to 2.5V, the analog input LSB voltage
value is correspondingly reduced from 20mV (5V span) to
10mV and 1 LSB at the VREF/2 input becomes 5mV. As can
be seen, this reduces the allowed initial tolerance of the
reference voltage and requires correspondingly less
absolute change with temperature variations. Note that
spans smaller than 2.5V place even tighter requirements on
the initial accuracy and stability of the reference source.
In general, the reference voltage will require an initial
adjustment. Errors due to an improper value of reference
voltage appear as full scale errors in the A/D transfer
FIGURE 12. THE VREFERENCE DESIGN ON THE IC
FIGURE 13. OFFSETTING THE ZERO OF THE ADC080X AND
PERFORMING AN INPUT RANGE (SPAN)
ADJUSTMENT
V+
DGND
VREF/2
AGND
(VREF)
R
DIGITAL
CIRCUITS
ANALOG
CIRCUITS
9
810
20
DECODE
300
TO VREF/2
TO VIN(-)
ZERO SHIFT VOLTAGE
0.1
F
5V
-
+
VREF
(5V)
FS
ADJ.
“SPAN”/2
ICL7611
FIGURE 14. HANDLING
±10V ANALOG INPUT RANGE
FIGURE 15. HANDLING
±5V ANALOG INPUT RANGE
VIN(-)
2R
5V
2R
VIN ± 10V
R
VIN(+)
(VREF)
V+
20
10
F
6
7
+
ADC0803-
ADC0804
VIN(-)
R
5V
VIN ±5V
R
VIN(+)
(VREF)
V+
20
10
F
6
7
+
ADC0803-
ADC0804
ADC0803, ADC0804
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADC0804LCN | 制造商:Texas Instruments 功能描述:IC 8BIT ADC DIP20 804 |
| ADC0804LCN/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 8-Bit |
| ADC0804LCN/B+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 8-Bit |
| ADC0804LCN/NOPB | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8B UP COMPATIBLE ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADC0804LCN/NOPB | 制造商:Texas Instruments 功能描述:A/D Converter (A-D) IC |
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