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參數(shù)資料
| 型號(hào)： | ADC10221 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 10-Bit, 15 MSPS, 98 mW A/D Converter with Internal Sample and Hold |
| 中文描述： | 10位，15 MSPS的98毫瓦的A / D內(nèi)部采樣與保持器 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 414K |
| 代理商： | ADC10221 |
Applications Information
(Continued)
3.0 POWER SUPPLY CONSIDERATIONS
A/D converters draw sufficient transient current to corrupt
their own power supplies if not adequately bypassed. A 10
μF to 50 μF tantalum or aluminum electrolytic capacitor
should be placed within an inch (2.5 centimeters) of the A/D
power pins, with a 0.1 μF ceramic chip capacitor placed as
close as possible to each of the converter’s power supply
pins. Leadless chip capacitors are preferred because they
have low lead inductance.
While a single voltage source should be used for the analog
and digital supplies of the ADC10221, these supply pins
should be well isolated from each other to prevent any digital
noise from being coupled to the analog power pins. A choke
or ferrite bead is recommended between the analog and
digital supply lines, with a ceramic capacitor close to the
analog supply pin.
The converter digital supply should not be the supply that is
used for other digital circuitry on the board. It should be the
same supply used for the ADC10221 analog supply.
As is the case with all high speed converters, the ADC10221
should be assumed to have little high frequency power sup-
ply rejection. A clean analog power source should be used.
No pin should ever have a voltage on it that is in excess of
the supply voltages or below ground, not even on a transient
basis. This can be a problem upon application of power to a
circuit. Be sure that the supplies to circuits driving the CLK,
PD, OE, analog input and reference pins do not come up any
faster than does the voltage at the ADC10221 power pins.
4.0 THE ADC10221 CLOCK
Although the ADC10221 is tested and its performance is
guaranteed with a 15 MHz clock, it typically will function with
clock frequencies from 1 MHz to 20 MHz. Performance is
best if the clock rise and fall times are 5 ns or less and if the
clock line is terminated with a series RC of about 100 Ohms
and 47 pF near the clock input pin, as shown in Figure 6
5.0 LAYOUT AND GROUNDING
Proper routing of all signals and proper ground techniques
are essential to ensure accurate conversion. Separate ana-
log and digital ground planes are required to meet data sheet
limits. The analog ground plane should be low impedance
and free of noise form other parts of the system.
Each bypass capacitor should be located as close to the ap-
propriate converter pin as possible and connected to the pin
and the appropriate ground plane with short traces. The ana-
log input should be isolated from noisy signal traces to avoid
coupling of spurious signals into the input.Any external com-
DS101038-20
FIGURE 6. Setting precision reference voltages
A
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADC10221CIVT | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:10-Bit, 15 MSPS, 98 mW A/D Converter with Internal Sample and Hold |
| ADC10221EVAL | 功能描述:BOARD EVALUATION FOR ADC10221 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 過時(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 |
| ADC1025 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:10-BIT uP COMPATIBLE A/D CONVERTERS |
| 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 |
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