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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

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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
ADI Confidential
Figure 15 illustrates all the output modes of the AD5823/
AD5823-1 and clearly shows the significant impact that ESRC
and ARC technology has on the settling time and the amount
of mechanical ringing and overshoot in a sample VCM.
100
95
90
85
80
75
70
65
60
55
50
45
40
35
30
–5
0
DIRECT LOAD ARC RES0.5 ARC RES2
ESRC
ARC RES1
5 10 15 20 25 30 35 40 45 50 55 60 65
TIME (ms)
Figure 15. Comparing Direct Load, ESRC, and ARC Modes Using a Sample VCM
MOVING THROUGH THE VCM THRESHOLD
The AD5823/AD5823-1 are designed to drive both spring-pre-
loaded and nonspring linear voice coil motors. The operational
principle of the spring-preloaded VCM is that the lens position is
controlled by the balancing of a voice coil and spring. Figure 16
shows an example transfer curve of a spring-preloaded VCM. The
key points of this transfer function are displacement, which is the
actual distance moved by the lens, and the current through the
motor. The recommended transfer curve crosses the threshold
once and then operates between the infinite and macro focus posi-
tions without returning below the threshold, as shown in Figure
16.
A threshold current is associated with spring-preloaded VCMs;
this current must be overcome for any displacement in the lens
to occur. The threshold value can vary across VCM models and
manufacturers. Care must be taken in overcoming this threshold
because a step displacement through the threshold can introduce a
mechanical shock to the VCM, which, in turn, causes mechanical
ringing. Mechanical ringing increases the settling time, distorts
the image, and may also shorten the lifetime of the VCM.
AD5823/AD5823-1
MACRO
FOCUS POSITION
INFINITE
FOCUS POSITION
VCM THRESHOLD
CURRENT (mA)
Figure 16. Recommended Transfer Curve of Spring-Preloaded VCM
Because of the mechanical ringing in the VCM associated with
moving through the threshold, the optimum mode of operation is
to ensure that the VCM is operated in its linear region—that is,
between the infinite focus position and the macro focus position—
as shown in Figure 16. To ensure the fastest autofocus times, the
user should ensure that the threshold is crossed only on the initial
move to the infinite focus position. After the threshold is crossed,
any subsequent moves should be made between the infinite focus
position and the macro focus position. Operating in this linear
region above the threshold leads to more predictable and accurate
lens movements and allows the user to take full advantage of
ESRC or ARC technology.
The AD5823/AD5823-1 have one threshold option that is
used to efficiently move through the VCM threshold. The
device crosses the threshold and reaches the target code in
the calculated actuation time. The VCM threshold value for
the device is programmed in the VCM_THRESHOLD_MSB
and VCM_THRESHOLD_LSB registers (Address 0x06 and
Address 0x07). The closer this value is to the actual VCM
threshold, the smaller the overshoot is.
Figure 17 shows the DAC codes incrementing over time.
Figure 18 shows the DAC codes decrementing over time.
FINISH CODE
300µs
THRESHOLD
START CODE
TIME
ACTUATION TIME
Figure 17. Moving from a Code Below the VCM Threshold
to a Code Above the Threshold
Rev. Sp0 | Page 11 of 22

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