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參數(shù)資料
| 型號(hào)： | AD7694BRMRL7 |
| 廠(chǎng)商： | ANALOG DEVICES INC |
| 元件分類(lèi)： | ADC |
| 英文描述： | 16-Bit, 250 kSPS PulSAR ADC in MSOP |
| 中文描述： | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁(yè)數(shù)： | 15/16頁(yè) |
| 文件大小： | 281K |
| 代理商： | AD7694BRMRL7 |
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AD7694
Rev. 0 | Page 15 of 16
0
SDO
*SDO REMAINS LOW IF FURTHER SCK CLOCKS ARE APPLIED WHILE CNV IS LOW
D15
D14
D13
D1
D0
t
DIS
SCK
1
2
3
14
15
16*
t
SCK
t
SCKL
t
SCKH
t
HSDO
t
DSDO
CNV
CONVERSION
ACQUISITION
t
CONV
t
CYC
ACQUISITION
t
ACQ
t
EN
Figure 25. Serial Interface Timing
LAYOUT
The printed circuit board that houses the AD7694 should be
designed so that the analog and digital sections are separated
and confined to certain areas of the board. The pinout of the
AD7694 with all its analog signals on the left side and all its
digital signals on the right side eases this task.
Avoid running digital lines under the device because these
couple noise onto the die, unless a ground plane under the
AD7694 is used as a shield. Fast switching signals, such as CNV
or clocks, should never run near analog signal paths. Crossover
of digital and analog signals should be avoided.
At least one ground plane should be used. It could be common
or split between the digital and analog section. In such a case, it
should be joined underneath the AD7694s.
The AD7694 voltage reference input REF has a dynamic input
impedance and should be decoupled with minimal parasitic
inductances. That is done by placing the reference decoupling
ceramic capacitor close to, and ideally right up against, the REF
and GND pins and by connecting these pins with wide, low
impedance traces.
Finally, the power supply, VDD, of the AD7694 should be
decoupled with a ceramic capacitor, typically 100 nF. This
capacitor should be placed close to the AD7694 and connected
using short and large traces to provide low impedance paths
and reduce the effect of glitches on the power supply lines.
EVALUATING THE AD7694’S PERFORMANCE
Other recommended layouts for the AD7694 are outlined in the
evaluation board for the AD7694 (
EVAL-AD7694
). The
evaluation board package includes a fully assembled and tested
evaluation board, documentation, and software for controlling
the board from a PC via the
EVAL-CONTROL BRD2
.
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