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參數資料
| 型號： | AD7851 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 14-Bit 333 kSPS Serial A/D Converter |
| 中文描述： | 14位333 kSPS的串行A / D轉換器 |
| 文件頁數： | 32/36頁 |
| 文件大小： | 435K |
| 代理商： | AD7851 |
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AD7851
–32–
REV. A
E valuating the AD7851 Performance
T he recommended layout for the AD7851 is outlined in the
evaluation board for the AD7851. T he evaluation board pack-
age includes a fully assembled and tested evaluation board,
documentation, and software for controlling the board from the
PC via the EVAL-CONT ROL BOARD. T he EVAL-CON-
T ROL BOARD can be used in conjunction with the AD7851
Evaluation board, as well as many other Analog Devices evalua-
tion boards ending in the CB designator, to demonstrate/evalu-
ate the ac and dc performance of the AD7851.
T he software allows the user to perform ac (fast Fourier trans-
form) and dc (histogram of codes) tests on the AD7851. It also
gives full access to all the AD7851 on-chip registers allowing for
various calibration and power-down options to be programmed.
AD785x Family
All parts are 12 bits, 200 kSPS, 3.0 V to 5.5 V.
AD7853 – Single Channel Serial
AD7854 – Single Channel Parallel
AD7858 – E ight Channel Serial
AD7859 – E ight Channel Parallel
APPLICAT ION HINT S
Grounding and Layout
T he analog and digital supplies to the AD7851 are independent
and separately pinned out to minimize coupling between the
analog and digital sections of the device. T he part has very good
immunity to noise on the power supplies as can be seen by the
PSRR versus Frequency graph. However, care should still be
taken with regard to grounding and layout.
T he printed circuit board that houses the AD7851 should be de-
signed such that the analog and digital sections are separated
and confined to certain areas of the board. T his facilitates the
use of ground planes that can be separated easily. A minimum
etch technique is generally best for ground planes as it gives the
best shielding. Digital and analog ground planes should only be
joined in one place. If the AD7851 is the only device requiring
an AGND to DGND connection, then the ground planes should
be connected at the AGND and DGND pins of the AD7851. If
the AD7851 is in a system where multiple devices require
AGND to DGND connections, the connection should still be
made at one point only, a star ground point which should be
established as close as possible to the AD7851.
Avoid running digital lines under the device as these will couple
noise onto the die. T he analog ground plane should be allowed
to run under the AD7851 to avoid noise coupling. T he power
supply lines to the AD7851 should use as large a trace as pos-
sible to provide low impedance paths and reduce the effects of
glitches on the power supply line. Fast switching signals like
clocks should be shielded with digital ground to avoid radiating
noise to other sections of the board and clock signals should
never be run near the analog inputs. Avoid crossover of digital
and analog signals. T races on opposite sides of the board should
run at right angles to each other. T his will reduce the effects of
feedthrough through the board. A microstrip technique is by far
the best but is not always possible with a double-sided board. In
this technique, the component side of the board is dedicated to
ground planes while signals are placed on the solder side.
Good decoupling is also important. All analog supplies should
be decoupled with 10
μ
F tantalum in parallel with 0.1
μ
F ca-
pacitors to AGND. All digital supplies should have a 0.1
μ
F
disc ceramic capacitor to AGND. T o achieve the best from these
decoupling components, they must be placed as close as possible
to the device, ideally right up against the device. In systems
where a common supply voltage is used to drive both the AV
DD
and DV
DD
of the AD7851, it is recommended that the system’s
AV
DD
supply is used. In this case there should be a 10
resistor
between the AV
DD
pin and DV
DD
pin. T his supply should have
the recommended analog supply decoupling capacitors between
the AV
DD
pin of the AD7851 and AGND and the recommended
digital supply decoupling capacitor between the DV
DD
pin of the
AD7851 and DGND.
相關PDF資料 |
PDF描述 |
|---|---|
| AD7851AN | 14-Bit 333 kSPS Serial A/D Converter |
| AD7851AR | 14-Bit 333 kSPS Serial A/D Converter |
| AD7851ARS | 14-Bit 333 kSPS Serial A/D Converter |
| AD7851KN | 14-Bit 333 kSPS Serial A/D Converter |
| AD7851KR | 14-Bit 333 kSPS Serial A/D Converter |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7851AN | 制造商:Analog Devices 功能描述:ADC Single SAR 333ksps 14-bit Serial 24-Pin PDIP 制造商:Rochester Electronics LLC 功能描述:14 BIT SELF CALIBRATION ADC I.C. - Bulk |
| AD7851ANZ | 功能描述:IC ADC 14BIT SRL 333KSPS 24-DIP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 位數:12 采樣率（每秒）:3M 數據接口:- 轉換器數目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數目和類型:- |
| AD7851AR | 制造商:Analog Devices 功能描述:ADC Single SAR 333ksps 14-bit Serial 24-Pin SOIC W 制造商:Rochester Electronics LLC 功能描述:14 BIT SELF CALIBRATION ADC I.C. - Bulk |
| AD7851AR-REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 333ksps 14-bit Serial 24-Pin SOIC W T/R |
| AD7851ARS | 制造商:Analog Devices 功能描述:ADC Single SAR 333ksps 14-bit Serial 24-Pin SSOP 制造商:Analog Devices 功能描述:IC 14-BIT ADC |
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