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PDF AD5823 Datasheet ( Hoja de datos )

Número de pieza AD5823
Descripción 10-Bit VCM Driver
Fabricantes Analog Devices 
Logotipo Analog Devices Logotipo
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AD5823 datasheet

1 Page

AD5823 pdf
ADI Confidential
ABSOLUTE MAXIMUM RATINGS
Table 4.
Parameter
VDD to GND
Digital Inputs
ISINK to GND
Operating Temperature Range
Storage Temperature Range
Junction Temperature
Rating
−0.3 V to +4.2 V
−0.3 V to VDD + 0.3 V
−0.3 V to VDD + 0.3 V
−40°C to +85°C
−65°C to +150°C
125°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
AD5823/AD5823-1
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 5. Thermal Resistance
Package Type
WLCSP (CB-6-11)
θJA
1601
1 For an S2P2 board.
Unit
°C/W
ESD CAUTION
Rev. Sp0 | Page 5 of 22

5 Page

AD5823 arduino
AD5823/AD5823-1
ADI Confidential
Ringing Control
Ringing control is enabled or disabled on the AD5823/AD5823-1
using the RING_CTRL bit (Bit 2 in the VCM_CODE_MSB
register, Address 0x04). When RING_CTRL = 0, direct load
mode is used.
In direct load mode, the VCM_MOVE_TIME register
(Address 0x03) is ignored, and the output increments or
decrements to the target code in a single step. The target code
is written to the VCM_CODE_MSB and VCM_CODE_LSB
registers, Address 0x04 and Address 0x05. No ringing control
is used in direct load mode.
When ringing control is enabled (by setting RING_CTRL = 1),
the AD5823/AD5823-1 allow the user to overcome the mechanical
limitations associated with reductions in VCM form factor. The
AD5823/AD5823-1 VCM drivers can operate in one of four
different ringing control modes:
Mode 0—ARC RES1
Mode 1—ARC RES0.5
Mode 2—ARC RES2
Mode 3—ESRC
When ESRC mode is used (by setting the MODE[1:0] bits to 11
in the MODE register, Address 0x02), the user decides the required
move time and uses the following equation to determine the value
to be written to the VCM_MOVE_TIME register (Address 0x03).
VCM_MOVE_TIME = (tRES (µs)/51.2 µs) − Offset
where Offset = value of HIGH_FREQ_RANGE (default = 0x80).
In ESRC mode, the output increments or decrements to the
target code in single-code steps in the required actuation time.
When one of the ARC modes is used, the VCM_MOVE_TIME
register should be loaded with a value equivalent to the VCM
mechanical resonance period (tRES). This value can be calculated
using the following equation:
VCM_MOVE_TIME = (tRES (µs)/51.2 µs) − Offset
where Offset = value of HIGH_FREQ_RANGE (default = 0x80).
The mechanical resonance period of a VCM can be found by
applying a step current to the VCM and measuring the time
taken for one complete oscillation. This is shown in Figure 13,
where
tRES = t2 t1
The output increments or decrements to the target code using
ARC technology.
ACTUATOR RESPONSE CONTROL (ARC)
TECHNOLOGY
Mechanical ringing is an inherent problem in voice coil motors.
It is an artifact of an underdamped system and is dependent on
many factors, but primarily on the integrity of the mechanical
springs employed in the actuator assembly.
ARC is a revolutionary autofocus response time and image
quality enhancing technology, which has been developed by
Analog Devices and integrated into the AD5823/AD5823-1
VCM drivers. ARC circuitry applies specialized, patented wave-
form and application technology to underdamped voice coil
motors to reduce mechanical ringing. This technology enables
the user to achieve very fast mechanical settling times and, as a
result, greatly enhances autofocus response times, image quality,
and user experience. This technology is completely proprietary
to Analog Devices and patents are pending.
ARC technology incorporates a wide band of tolerance around
the resonant period of the VCM to compensate for manufacturing
variability in the mechanical resonance period (tRES) of the VCM.
ARC technology can allow for variations of ±20% (for example,
manufacturing variations and variations over time and temper-
ature) in the VCM resonant period while still greatly enhancing
autofocus response times and image quality. This band of tolerance
varies, depending on the ARC option used.
One of the main advantages of ARC is its ability to maintain the
same actuation time, regardless of the size (in DAC codes) of
the step required. This is clearly illustrated in Figure 14, where it
is shown that a step of 100 codes and a step of 500 codes both
settle in 15.1 ms. Each of the three ARC options achieves a dif-
ferent actuation time. A faster actuation time leads to a narrower
resonant period tolerance band (see Figure 14 and Table 7).
160
140
120
100
80
60
40
20
0
–10
15.1ms
0 10
450 TO 550
550 TO 650
650 TO 750
750 TO 850
20 30
850 TO 950
450 TO 700
700 TO 950
450 TO 950
40 50
TIME (ms)
Figure 14. ARC Actuation Time Is Always the Same, Regardless of Step Size
Table 7. Actuation Times and Tolerances of ARC Options
ARC Option
Actuation Time
Tolerance
ARC RES0.5
ARC RES1
ARC RES2
0.5 × tRES
1.07 × tRES
2.13 × tRES
±3%
±10%
±20%
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