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AD5398
APPLICATIONS
The AD5398 is designed to drive both spring preloaded and
nonspring linear motors used in applications such as lens auto-
focus, image stabilization, or optical zoom. The operation
principle of the spring preloaded motor is that the lens position
is controlled by the balancing of a voice coil and spring. Figure 20
shows the transfer curve of a typical spring preloaded linear
motor for autofocus. The key points of this transfer function are
displacement or stroke, which is the actual distance the lens
moves in mm, and the current through the motor in mA.
Rev. A | Page 13 of 16
A start current is associated with spring preloaded linear
motors, which is effectively a threshold current that must be
exceeded for any displacement in the lens to occur. The start
current is usually 20 mA or greater; the rated stroke or
displacement is usually 0.25 mm to 0.4 mm; and the slope of
the transfer curve is approximately 10 μm/mA or less.
The AD5398 is designed to sink up to 120 mA, which is more
than adequate for available commercial linear motors or voice
coils. Another factor that makes the AD5398 the ideal solution
for these applications is the monotonicity of the device, which
ensures that lens positioning is repeatable for the application of
a given digital word.
Figure 21 shows a typical application circuit for the AD5398.
0
0.5
0.4
0.3
0.2
0.1
0
10
20
30
40
START
CURRENT
50
60
70
80
90
100
110
120
0
SINK CURRENT (mA)
S
Figure 20. Spring Preloaded Voice Coil Stroke vs. Sink Current
0
POWER-ON
RESET
3
7
2
6
4
1
POWER-DOWN
RESET
8
VOICE
COIL
ACTUATOR
R
SENSE
Ω
I
2
C SERIAL
INTERFACE
10-BIT
CURRENT
OUTPUT DAC
REFERENCE
R
AD5398
5
SCL
SDA
I
2
C MASTER
DEVICE
I
2
C SLAVE
DEVICE
I
2
C SLAVE
DEVICE
R
P
R
P
V
DD
V
DD
V
CC
0.1
μ
F
10
μ
F
+
0.1
μ
F
10
μ
F
+
Figure 21. Typical Application Circuit
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