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參數(shù)資料
| 型號(hào)： | AD5821BCBZ-REEL71 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 120 mA, Current Sinking, 10-Bit, I2C DAC |
| 中文描述： | 120毫安，灌電流，10位和I2C數(shù)模轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大?。?/td> | 386K |
| 代理商： | AD5821BCBZ-REEL71 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)當(dāng)前第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)
AD5821
Rev. 0 | Page 12 of 16
0
PD
X
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
X
X
X
X
0
0
SCL
SDA
START BY
MASTER
ACK BY
AD5821
1
1
9
1
ACK BY
AD5821
ACK BY
AD5821
STOP BY
MASTER
FRAME 3
LEAST SIGNIFICANT
DATA BYTE
FRAME 2
MOST SIGNIFICANT
DATA BYTE
Figure 22. Write Operation
FRAME 1
SERIAL BUS
ADDRESS BYTE
0
1
1
1
1
R/W
9
0
PD
X
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
X
X
X
X
0
0
SCL
SDA
START BY
MASTER
ACK BY
AD5821
1
1
9
1
ACK BY
AD5821
ACK BY
AD5821
STOP BY
MASTER
FRAME 3
LEAST SIGNIFICANT
DATA BYTE
FRAME 2
MOST SIGNIFICANT
DATA BYTE
FRAME 1
SERIAL BUS
ADDRESS BYTE
0
1
1
1
1
R/W
9
Figure 23. Read Operation
Table 6. Data Format
1
Serial Data-Words
Serial Data Bits
Input Register
Function
High Byte
SD7
R15
XSHUTDOWN
Low Byte
SD7
R7
D3
SD6
R14
X
SD5
R13
D9
SD4
R12
D8
SD3
R11
D7
SD2
R10
D6
SD1
R9
D5
SD0
R8
D4
SD6
R6
D2
SD5
R5
D1
SD4
R4
D0
SD3
R3
X
SD2
R2
X
SD1
R1
X
SD0
R0
X
1
XSHUTDOWN = soft power-down; X = unused/don’t care; and D9 to D0 = DAC data.
POWER SUPPLY BYPASSING AND GROUNDING
When accuracy is important in an application, it is beneficial to
consider power supply and ground return layout on the PCB.
The PCB for the AD5821 should have separate analog and digital
power supply sections. Where shared AGND and DGND is
necessary, the connection of grounds should be made at only
one point, as close as possible to the AD5821.
Special attention should be paid to the layout of the AGND return
path and, and it should be tracked between the voice coil motor
and I
SINK
to minimize any series resistance. Figure 24 shows the
output current sink of the AD5821 and illustrates the importance
of reducing the effective series impedance of AGND and the track
resistance between the motor and I
SINK
. The voice coil is modeled
as Inductor L
C
and Resistor R
C
. The current through the voice coil
is effectively a dc current that results in a voltage drop, V
C
, when
the AD5821 is sinking current. The effect of any series inductance
is minimal.
0
AGND
AD5821
Q1
GROUND
RETURN
I
SINK
V
DROP
R
SENSE
R
R
G
L
G
V
COIL
V
BATTERY
R
T
R
C
L
C
TRACE
RESISTANCE
VOICE
COIL
SDA
SCL
XSHUTDOWN
DGND
DGND
V
DD
Figure 24. Effect of PCB Trace Resistance and Inductance
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| AD5821D-WAFER | 制造商:AD 制造商全稱:Analog Devices 功能描述:120 mA, Current Sinking, 10-Bit, I2C DAC |
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