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參數(shù)資料
| 型號(hào)： | AD5821BCBZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 7/17頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC 10BIT CURRENTSINK 9WLCSP |
| 產(chǎn)品培訓(xùn)模塊： | Data Converter Fundamentals DAC Architectures |
| 產(chǎn)品變化通告： | AD5821 Obsolescence 06/Jan/2012 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 設(shè)置時(shí)間： | 250µs |
| 位數(shù)： | 10 |
| 數(shù)據(jù)接口： | 串行 |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 電壓電源： | 單電源 |
| 功率耗散（最大）： | 20mW |
| 工作溫度： | -30°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 9-UFBGA，WLCSP |
| 供應(yīng)商設(shè)備封裝： | 9-WLCSP（1.52 x 1.69） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 輸出數(shù)目和類型： | 1 電流，單極 |
| 采樣率（每秒）： | * |
| 產(chǎn)品目錄頁(yè)面： | 784 (CN2011-ZH PDF) |
| 配用： | EVAL-AD5821EBZ-ND - BOARD EVALUATION FOR AD5821 |
| 其它名稱： | AD5821BCBZ-REEL7DKR |
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AD5821
Rev. 0 | Page 14 of 16
APPLICATIONS INFORMATION
The AD5821 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 25 shows the
transfer curve of a typical spring-preloaded linear motor for
autofocus. The key points of this transfer function are displace-
ment or stroke, which is the actual distance the lens moves in
millimeters (mm) and the current through the motor, measured
in milliamps (mA).
A start current is associated with spring-preloaded linear
motors, which is 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 AD5821 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 AD5821 the ideal solution
for these applications is the monotonicity of the device, ensuring
that lens positioning is repeatable for the application of a given
digital word.
Figure 26 shows a typical application circuit for the AD5821.
10
50
60
80
70
90 100
40
30
20
110 120
0.1
0.5
0.4
0.3
0.2
START
CURRENT
SINK CURRENT (mA)
S
T
RO
KE
(
m
)
05
95
0-
0
29
Figure 25. Spring-Preloaded Voice Coil Stroke vs. Sink Current
05
95
0-
02
8
7
2
1
XSHUTDOWN
8
VOICE
COIL
ISINK
RSENSE
REFERENCE
R
AD5821
5
SCL
SDA
I2C MASTER
DEVICE
I2C SLAVE
DEVICE
RP
VDD
VCC
VDD
D1
0.1F
I2C SERIAL
INTERFACE
3
4
6
POWER-ON
RESET
0.1F
10F
+
VCC
VDD
10-BIT
CURRENT
OUTPUT DAC
Figure 26. Typical Application Circuit
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