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參數(shù)資料
| 型號： | EVAL-AD7662CB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Evaluation Board AD766X/AD767X |
| 中文描述： | 評估板AD766X/AD767X |
| 文件頁數(shù)： | 2/15頁 |
| 文件大?。?/td> | 1841K |
| 代理商： | EVAL-AD7662CB |
REV. PrK
EVAL-AD766XCB/AD767XCB
–2–
PRELIMINARY TECHNICAL DATA
OPERATING THE EVAL-AD766XCB/AD767XCB
The EVAL-AD766XCB/AD767XCB is a four-layer board
carefully laid out and tested to demonstrate the specific high
accuracy performance of the AD766X/AD767X. Figure 1
shows the schematics of the evaluation board. The layouts of
the board are given in :
Top side silk-screen - Figure 2
Top side layer - Figure 3
Ground layer - Figure 4
Shield layer - Figure 5
Bottom side layer - Figure 6
Bottom side silk-screen - Figure 7.
The EVAL-AD766XCB/AD767XCB is a flexible design that
enables the user to choose among many different board con-
figurations. A description of each selectable jumper/switch is
listed in Table II and the available test points are listed in
Table III. Note that the button of a switch in position A ( U3
side ) defines a low level.
The EVAL-AD766XCB/AD767XCB is configured in factory
with 0 to 2.5 V ADC input range for the AD7660, AD7664,
and AD7675/7676/7677 and +/-5V for the AD7663/7665/
7671; front-end amplifiers U6 and U7 set with a gain of +1,
powered through the EVAL-CONTROL BOARD, and the
on-board
generation used.
On-board or external
nal
jitter and sharp edges to get the best noise performance of the
part. Meanwhile, it is recommended to use the on-board
generation which is done by dividing MCLK signal
(20MHZ) by the numbers shown in Table I, which are en-
tered in the software. Activity on BUSY pin of the ADC
turns on the LED.
could be used. When an exter-
signal is applied, this signal should have very low
Table I.
GENERATION
Part
Division Factor
Throughput Rate
AD7660
200
100KSPS
AD7662/68
40
500KSPS
AD7663
80
250KSPS
AD7664/50
35
571KSPS
AD7665
35
571KSPS
AD7671
20
1MSPS
AD7675
200
100KSPS
AD7676
35
571KSPS
AD7677
20
1MSPS
Conversion data is available at the output bus BD on U3, on
the 40-pin connector P2, and on the 96-pin connector P3.
Additionally, BD data is updated on the falling/rising edge of
and BBUSY on P3, low when BD data is valid are
delayed from the BD data by about 20 ns to ease the inter-
face. When either parallel or serial reading mode of the ADC
is used, the data is available on this parallel bus. When serial
reading mode of the ADC is used, the serial interface signals
of the ADC are buffered and available on the 20-pin connec-
tor P1. When slave serial reading mode of the
AD766X/AD767X is used, the external serial clock SCLK
applied to the ADC is at half the MCLK frequency.
Power Supplies and Grounding
The evaluation board ground plane is separated into two
sections: a plane for the digital interface circuitry and an ana-
log plane for the analog input and external reference
circuitry. To attain high resolution performance, the board
was designed to ensure that all digital ground return paths do
not cross the analog ground return paths.
The EVAL-AD766XCB/AD767XCB has three power supply
blocks: a single 5V supply VA
(SJ1) for the AD766X/AD767X
and the reference voltage circuitry, a digital 5V supply VL
(SJ2)
for the digital interface circuitry and the digital section of the
ADC, and a selectable +/-12V (with a possibility of +/-15V
with control Brd2) or +/-5V supply for the analog signal con-
ditioning circuitry (SJ3). All supplies are decoupled to ground
with 10 F tantalum and 0.1 F ceramic capacitors.
Analog Input Ranges
The analog front-end amplifier circuitry U6 and U7 allows
flexible configuration changes such as positive or negative
gain, input range scaling, filtering, addition of a DC compo-
nent, use of different op-amp and supplies.
Figure 1 shows the front end op-amp configuration used with
the AD7660/7663/7664/7665/7671/7675/7676/7677.
In some applications, it is desired to use a bipolar or wider
analog input range like, for instance, ± 10V, ± 5V, ± 2.5V, or
0 to +5V. For the AD76XX parts which do not have directly
those input ranges like the AD7660/7664/7675/7676/7677,
by simple modifications of the input driver circuitry of the
EVAL-AD766XCB/AD767XCB, bipolar and wider input
ranges can be used without any performance degradation.
Components values required and resulting full-scale ranges
are shown in table IV and table V.
In factory, the analog input of U6 is set at mid-scale
(R6=R7=590 ) for the AD7660/7664/7675/7676/7677. For
AD7663/7665/7671, R7 is not connected to maintain the
input at 0V (mid-scale). This allows a transition noise test
without any other equipment. An FFT test can be done by
applying a very low distortion AC source.
EVAL-CONTROL BOARD INTERFACE
The EVAL-AD766XCB/AD767XCB interfaces to the EVAL-
CONTROL BRD2 through the 96-way connector.
RUNNING THE EVAL-AD766X/AD767XCB SOFTWARE
Software Description
The EVAL-AD766XCB/AD767XCB comes with software for
analyzing the AD766X/AD767X. Through the EVAL-CON-
TROL BRD2 one can perform a histogram to determine code
transition noise, and Fast Fourier Transforms (FFT's) to
determine the Signal-to-Noise Ratio (SNR), Signal-to-Noise-
plus-Distortion (SNRD) and Total-Harmonic-Distortion
(THD). The front-end PC software has four screens as
shown in Figure 8,9,10 and 11. Figure 8 is the Setup Screen
where input voltage range, sample rate, number of samples
are selected. Figure 9 is the Histogram Screen, which allows
the code distribution for DC input and computes the mean
and standard deviation.
相關PDF資料 |
PDF描述 |
|---|---|
| EVAL-AD7663CB | Evaluation Board AD766X/AD767X |
| EVAL-AD7671CB | Evaluation Board AD766X/AD767X |
| EVAL-AD7683CB | 16-Bit, 100 kSPS PulSAR ADC in MSOP/QFN |
| EVAL-CONTROLBRD3 | 16-Bit, 100 kSPS PulSAR ADC in MSOP/QFN |
| EVAL-AD7705EB | 3 V/5 V, 1 mW 2-/3-Channel 16-Bit, Sigma-Delta ADCs |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| EVAL-AD7663CB | 制造商:Analog Devices 功能描述: |
| EVAL-AD7663CBZ | 功能描述:BOARD EVALUATION FOR AD7663 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 模數(shù)轉換器 (ADC) 系列:PulSAR® 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標準）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
| EVAL-AD7663EDZ | 制造商:Analog Devices 功能描述:CONVERTER - ADC |
| EVAL-AD7664CB | 制造商:Analog Devices 功能描述:Evaluation Kit For 16-Bit, 570 KSP Pulsar Unipolar CMOS ADC |
| EVAL-AD7664CBZ | 功能描述:BOARD EVALUATION FOR AD7664 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 模數(shù)轉換器 (ADC) 系列:PulSAR® 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標準）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
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