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參數(shù)資料
| 型號： | ADC10221CIVT |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | ADC |
| 英文描述： | 10-Bit, 15 MSPS, 98 mW 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 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 414K |
| 代理商： | ADC10221CIVT |
Applications Information
1.0 THE ANALOG INPUT
The analog input of the ADC10221 is a switch (transmission
gate) followed by a switched capacitor amplifier. The capaci-
tance seen at the input changes with the clock level, appear-
ing as about 3 pF when the clock is low, and about 5 pF
when the clock is high. This small change in capacitance can
be reasonably assumed to be a fixed capacitance. Care
should be taken to avoid driving the input beyond the supply
rails, even momentarily, as during power-up.
The CLC409 has been found to be a good device to drive the
ADC10221 because of its low voltage capability, wide band-
width, low distortion and minimal Differential Gain and Differ-
ential Phase. The CLC409 performs best with a feedback re-
sistor of about 100 ohms.
Care should be taken to keep digital noise out of the analog
input circuitry to maintain highest noise performance.
2.0 REFERENCE INPUTS
Note:
Throughout this data sheet reference is made to
V
+ and to V
. These refer to the internal voltage
across the reference ladder and are, nominally, V
REF
+ S and
V
REF
S, respectively.
Figure 4 shows a simple reference biasing scheme with
minimal components. While this circuit might suffice for
some applications, it does suffer from thermal drift because
the external 750
resistor at pins 1 and 2 will have a differ-
ent temperature coefficient than the on-chip resistors. Also,
the on-chip resistors, while well matched to each other, will
have a large tolerance compared with any external resistors,
causing the value of V
REF
- to be quite variable.
The circuit of Figure 5 is an improvement over the circuit of
Figure 4in that both ends of the reference ladder are defined
with reference voltages. This reduces problems of high refer-
ence variability and thermal drift, but requires two reference
sources.
In addition to the usual V
+ and V
reference inputs,
theADC10221 has two sense outputs for precision control of
the ladder voltages. These sense outputs (V
+ S and
V
S) compensate for errors due to IR drops between the
source of the reference voltages and the ends of the refer-
ence ladder itself.
With the addition of two op-amps, the voltages at the top and
bottom of the reference ladder can be forced to the exact
value desired, as shown in Figure 6
DS101038-18
FIGURE 4. Simple, low component cournt reference biasing
A
www.national.com
11
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| ADC10221EVAL | 功能描述:BOARD EVALUATION FOR ADC10221 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 過時/停產(chǎn)零件編號 系列:- 標準包裝:1 系列:- 傳感器類型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關(guān)產(chǎn)品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
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| ADC1025BCJ | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:10-BIT uP COMPATIBLE A/D CONVERTERS |
| ADC1025BCJ/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， 10-Bit |
| ADC1025BCJ-1 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:10-BIT uP COMPATIBLE A/D CONVERTERS |
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