- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄378281 > ADC10321 (National Semiconductor Corporation) 10-Bit, 20MSPS, 98mW A/D Converter with Internal Sample and Hold(10位20MSPS, 98 mW帶內(nèi)部采樣和保持功能A/D轉(zhuǎn)換器) PDF資料下載
參數(shù)資料
| 型號(hào)： | ADC10321 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 10-Bit, 20MSPS, 98mW A/D Converter with Internal Sample and Hold(10位20MSPS, 98 mW帶內(nèi)部采樣和保持功能A/D轉(zhuǎn)換器) |
| 中文描述： | 10位，20MSPS，98mW的A / D轉(zhuǎn)換器內(nèi)部采樣和保持（10位20MSPS，98毫瓦帶內(nèi)部采樣和保持功能的A / D轉(zhuǎn)換器） |
| 文件頁(yè)數(shù)： | 11/16頁(yè) |
| 文件大?。?/td> | 395K |
| 代理商： | ADC10321 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)當(dāng)前第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)
Applications Information
1.0 THE ANALOG INPUT
The analog input of the ADC10321 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 3pF when the clock is low, and about 5pF 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
ADC10321 because of its low voltage capability, wide band-
width, low distortion and minimal Differential Gain and Dif-
ferential Phase. The CLC409 performs best with a feedback
resistor 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 resistor at pin 2 will have a different temperature
coefficient than the on-chip resistors. Also, the on-chip resis-
tors, 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. No d.c. current should be
allowed to flow through pin 1 or 32 or linearity errors will
result near the zero scale and full scale ends of the signal
excursion. The sense pins were designed to be used with
high impedance opamp inputs for high accuracy biasing.
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 ref-
erence variability and thermal drift, but requires two refer-
ence sources.
In addition to the usual reference inputs, the ADC10321 has
two sense outputs for precision control of the ladder volt-
ages. These sense outputs (V
+ S and V
S) compen-
sate for errors due to IR drops between the source of the
reference voltages and the ends of the reference 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
DS100897-18
FIGURE 4. Simple, low component cournt reference biasing
A
www.national.com
11
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADC1038CIWM | 10-Bit Serial I/O A/D Converter with Analog Multiplexer |
| ADC1038 | 10-Bit Serial I/O A/D Converter with Analog Multiplexer |
| ADC10461 | 10-Bit 600 ns A/D Converter with Input Multiplexer and Sample/Hold |
| ADC10461CIWM | 10-Bit 600 ns A/D Converter with Input Multiplexer and Sample/Hold |
| ADC10462CIWM | 10-Bit 600 ns A/D Converter with Input Multiplexer and Sample/Hold |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADC10321CIVT | 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 |
| 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 |
| ADC10321EVAL | 功能描述:BOARD EVALUATION FOR ADC10321 RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 過(guò)時(shí)/停產(chǎn)零件編號(hào) 系列:- 標(biāo)準(zhǔn)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 |
| 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 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。