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AD5398BCPZ-REEL7 датащи(PDF) 11 Page - Analog Devices

номер детали AD5398BCPZ-REEL7
подробное описание детали  120 mA, Current Sinking, 10-Bit, I2C DAC
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

AD5398BCPZ-REEL7 датащи(HTML) 11 Page - Analog Devices

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AD5398
Rev. A | Page 11 of 16
PD
X
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
X
X
X
X
00
SCL
SDA
START BY
MASTER
ACK BY
AD5398
11
91
ACK BY
AD5398
ACK BY
AD5398
STOP BY
MASTER
FRAME 3
LEAST SIGNIFICANT
DATA BYTE
FRAME 2
MOST SIGNIFICANT
DATA BYTE
FRAME 1
SERIAL BUS
ADDRESS BYTE
0
1
1
X
X
R/W
9
Figure 17. Write Operation
PD
X
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
X
X
X
X
00
SCL
SDA
START BY
MASTER
ACK BY
AD5398
11
91
ACK BY
AD5398
ACK BY
AD5398
STOP BY
MASTER
FRAME 3
LEAST SIGNIFICANT
DATA BYTE
FRAME 2
MOST SIGNIFICANT
DATA BYTE
FRAME 1
SERIAL BUS
ADDRESS BYTE
0
1
1
X
X
R/W
9
Figure 18. Read Operation
Table 6. Data Format
1
Serial Data-Words
High Byte
Low Byte
Serial Data Bits
SD7
SD6
SD5
SD4
SD3
SD2
SD1
SD0
SD7
SD6
SD5
SD4
SD3
SD2
SD1
SD0
Input Register
R15
R14
R13
R12
R11
R10
R9
R8
R7
R6
R5
R4
R3
R2
R1
R0
Function
PD
X
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
X
X
X
X
1 PD = soft power-down; X = unused/don’t care; 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 AD5398 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 AD5398.
Special attention should be paid to the layout of the AGND
return path and track between the voice coil motor and ISINK to
minimize any series resistance. Figure 19 shows the output
current sink of the AD5398 and illustrates the importance of
reducing the effective series impedance of AGND, and the track
resistance between the motor and ISINK. The voice coil is
modeled as inductor LC and resistor RC. The current through
the voice coil is effectively a dc current that results in a voltage
drop, VC, when the AD5398 is sinking current; the effect of any
series inductance is minimal. The maximum voltage drop
allowed across RSENSE is 400 mV, and the minimum drain to
source voltage of Q1 is 200 mV. This means that the AD5398
output has a compliance voltage of 600 mV. If VDROP falls below
600 mV, the output transistor, Q1, can no longer operate
properly and ISINK might not be maintained as a constant.
7
AGND
VG
Q1
GROUND
RESISTANCE
GROUND
INDUCTANCE
8
ISINK
RSENSE
3.3
Ω
RG
LG
VDROP
VT
VC
VBAT
RT
RC
LC
TRACE
RESISTANCE
VOICE
COIL
ACTUATOR
Figure 19. Effect of PCB Trace Resistance and Inductance


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