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參數(shù)資料
| 型號(hào)： | ADC10321CIVT |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | ADC |
| 英文描述： | 10-Bit, 20MSPS, 98mW A/D Converter with Internal Sample and Hold |
| 中文描述： | 1-CH 10-BIT RESISTANCE LADDER ADC, PARALLEL ACCESS, PQFP32 |
| 封裝： | TQFP-32 |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大小： | 414K |
| 代理商： | ADC10321CIVT |
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Applications Information
(Continued)
The V
REF
+ F and V
REF
F pins should each be bypassed to
AGND with 10μF tantalum or electrolytic and 0.1μF ceramic
capacitors. The circuit of Figure 6may be used if it is desired
to obtain precise reference voltages. The LMC6082 in this
circuit was chosen for its low offset voltage, low voltage
rail-to-rail capability and low cost.
Since the current flowing through the sense lines (those lines
associated with V
+ S and V
S) is essentially zero,
there is negligible voltage drop across any resistance in se-
ries with these sense pins and the voltage at the inverting in-
put of the op-amp accurately represents the voltage at the
top (or bottom) of the ladder. The op-amp drives the force in-
put, forcing the voltage at the ends of the ladder to equal the
voltage at the op-amp’s non-inverting input, plus any offset
voltage. For this reason, op-amps with low V
, such as the
LMC6081 and LMC6082, should be used for this application.
Voltages at the reference sense pins (V
REF
+ S and V
REF
S)
should be within the range specified in the Operating Ratings
table (2.3V to 4.0V for V
REF
+ and 1.3V to 3.0V for V
REF
).
Any device used to drive the reference pins should be able to
source sufficient current into the V
REF
+ F pin and sink suffi-
cient current from the V
REF
F pin when the ladder is at its
minimum value of 850 Ohms.
The reference voltage at the top of the ladder (V
+) may
take on values as low as 1.0V above the voltage at the bot-
tom of the ladder (V
) and as high as (V
A
- 1.0V) Volts.
The voltage at the bottom of the ladder (V
) may take on
values as low as 1.3 Volts and as high as 3.0V. However, to
minimize noise effects and ensure accurate conversions, the
total reference voltage range (V
+ - V
REF
) should be a
minimum of 2.0V and a maximum of 2.7V.
DS100897-19
FIGURE 5. Better low component count reference biasing
A
www.national.com
12
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| ADC10321CIVT/NOPB | 功能描述:模數(shù)轉(zhuǎn)換器 - 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 |
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| ADC1034 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:ADC1031/ADC1034/ADC1038 10-Bit Serial I/O A/D Converters with Analog Multiplexer and Track/Hold Function |
| ADC1034BIJ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 10-Bit |
| ADC1034CIJ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 10-Bit |
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