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參數資料
| 型號： | AD9945KCP |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 消費家電 |
| 英文描述： | Complete 12-Bit 40 MHz CCD Signal Processor |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, QCC32 |
| 封裝： | 5 X 5 MM, MO-220-VHHD-2, LFCSP-32 |
| 文件頁數： | 13/16頁 |
| 文件大小： | 217K |
| 代理商： | AD9945KCP |
REV. A
AD9945
–13–
Internal Power-On Reset Circuitry
After power-on, the AD9945 will automatically reset all internal
registers and perform internal calibration procedures. This takes
approximately 1 ms to complete. During this time, normal clock
signals and serial write operations may occur. However, serial
register writes will be ignored until the internal reset operation
is completed.
Grounding and Decoupling Recommendations
As shown in Figure 11, a single ground plane is recommended for
the AD9945. This ground plane should be as continuous as
possible. This will ensure that all analog decoupling capacitors
provide the lowest possible impedance path between the power
and bypass pins and their respective ground pins. All decoupling
capacitors should be located as close as possible to the package
pins. A single clean power supply is recommended for the AD9945,
but a separate digital driver supply may be used for DRVDD
(Pin 11). DRVDD should always be decoupled to DRVSS (Pin 12),
which should be connected to the analog ground plane. Advan-
tages of using a separate digital driver supply include using a
lower voltage (2.7 V) to match levels with a 2.7 V ASIC, reducing
digital power dissipation, and reducing potential noise coupling.
If the digital outputs (Pins 1 to 10, 31, and 32) must drive a
load larger than 20 pF, buffering is recommended to reduce
digital code transition noise. Alternatively, placing series resis-
tors close to the digital output pins may also help reduce noise.
24 REFB
23 REFT
22 CCDIN
21 AVSS
20 AVDD
D2 1
D3 2
D4 3
3
19 SHD
18 SHP
17 CLPOB
D5 4
D6 5
D7 6
D8 7
D9 8
3
3
2
2
2
2
2
DATA
OUTPUTS
12
D
D
9
1
3V
DRIVER
SUPPLY
D
D
D
D
D
P
1
1
1
1
1
3V
ANALOG
SUPPLY
5
CLOCK
INPUTS
3
SERIAL
INTERFACE
3V
ANALOG
SUPPLY
CCDIN
PIN 1
IDENTIFIER
AD9945
(Not to Scale)
TOP VIEW
1.0 F
0.1 F
0.1 F
0.1 F
0.1 F
D0
D1
NC = NO CONNECT
1
1.0 F
NOTE
THE EXPOSED PAD ON THE BOTTOM OF THE AD9945 SHOULD BE
SOLDERED TO THE GND PLANE OF THE PRINTED CIRCUIT BOARD
Figure 11. Recommended Circuit Configuration for CCD Mode
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