參數(shù)資料
型號(hào)： AD5398BCPZ-REEL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 7/17頁(yè)
文件大小： 0K
描述： IC DAC 10BIT CURRENT-SINK 8LFCSP
產(chǎn)品培訓(xùn)模塊： Data Converter Fundamentals
DAC Architectures
標(biāo)準(zhǔn)包裝： 5,000
設(shè)置時(shí)間： 250µs
位數(shù)： 10
數(shù)據(jù)接口： I²C，串行
轉(zhuǎn)換器數(shù)目： 1
電壓電源： 單電源
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 8-VFDFN 裸露焊盤，CSP
供應(yīng)商設(shè)備封裝： 8-LFCSP-VD（3x3）
包裝： 帶卷 (TR)
輸出數(shù)目和類型： 1 電流，單極
采樣率（每秒）： 31k
AD5398
Rev. B | Page 14 of 16
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 22
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.
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 23 shows a typical application circuit for the AD5398.
05034-020
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
T
ROKE
(mm)
Figure 22. Spring Preloaded Voice Coil Stroke vs. Sink Current
05034-022
POWER-ON
RESET
3
7
2
6
4
1
POWER-DOWN
RESET
8
VOICE
COIL
ACTUATOR
RSENSE
3.3
Ω
I2C SERIAL
INTERFACE
10-BIT
CURRENT
OUTPUT DAC
REFERENCE
R
AD5398
5
SCL
SDA
I2C MASTER
DEVICE
I2C SLAVE
DEVICE
I2C SLAVE
DEVICE
RP
VDD
VCC
0.1
μF
10
μF
+
0.1
μF
10
μF
+
Figure 23. Typical Application Circuit
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