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| 型號： | EVAL-AD5535EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 6/16頁 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD5535 |
| 產(chǎn)品培訓(xùn)模塊： | DAC Architectures |
| 標(biāo)準(zhǔn)包裝： | 1 |
| DAC 的數(shù)量： | 32 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 1.2M |
| 數(shù)據(jù)接口： | 串行 |
| 設(shè)置時(shí)間： | 65µs |
| DAC 型： | 電壓 |
| 工作溫度： | -40°C ~ 85°C |
| 已供物品： | 板，CD |
| 已用 IC / 零件： | AD5535 |
| 相關(guān)產(chǎn)品： | AD5535ABCZ-ND - IC DAC 14BIT 32CHAN 124CSPBGA |
AD5535
Rev. A | Page 14 of 16
APPLICATIONS
MEMS MIRROR CONTROL APPLICATION
ADSP-21065L
AD5535
OUTPUT RANGE
0V TO 200V
VOUT0
14-BIT DAC
REF198
(4.096V)
ACTUATORS
FOR
MEMS
MIRROR
ARRAY
SENSOR
+
4-TO-1 MUX
(ADG739)
OR
32-TO-1 MUX
(ADG732)
8-CHANNEL
ADC (AD7856)
OR
SINGLE-
CHANNEL
ADC (AD7671)
+210V
+5V
VPP
–5V
V–
V+
REF_IN
05068-015
VOUT31
The AD5535 is targeted to all optical switching control systems
based on MEMS technology. The AD5535 is a 32-channel,
14-bit DAC with integrated high voltage amplifiers. The output
amplifiers are capable of generating an output range of 0 V to
200 V when using a 4 V reference. The full-scale output voltage
is programmable from 50 V to 200 V using reference voltages
from 1 V to 4 V. Each amplifier can output 700 μA and directly
drives the control actuators, which determine the position of
MEMS mirrors in optical switch applications.
The AD5535 is generally used in a closed-loop feedback system,
as shown in
Figure 21. AD5535 in a MEMS-Based Optical Switch
Figure 21, with a high resolution ADC and DSP.
The exact position of each mirror is measured using capacitive
sensors. The sensor outputs are multiplexed using an ADG739
4:1 multiplexer to an 8-channel, 14-bit ADC (AD7856). An
alternative solution is to multiplex using a 32-to-1 multiplexer
(ADG732) into a single-channel ADC (AD7671). The control
loop is driven by an ADSP-21065L, a 32-bit SHARC DSP with
an SPI-compatible SPORT interface. With 14-bit monotonic
behavior and 0 V to 200 V output range, coupled with its fast
serial interface, the AD5535 is ideally suited for controlling a
cluster of MEMS-based mirrors.
IPC-221-COMPLIANT BOARD LAYOUT
The diagram in Figure 22 is a typical 2-layer printed circuit board
layout for the AD5535 that complies with the specifications
outlined in IPC-221. No signals should be connected to the four
corner balls labeled as original no connects. Balls labeled as
additional no connects should be connected to AGND.
The routing shown in Figure 22 shows the feasibility of
connecting to the high voltage balls while complying with
the spacing requirements of IPC-221. Figure 22 also shows
the physical distances that are available.
A
B
C
D
E
F
G
J
H
K
L
M
N
P
10
8
7
6
3
2
1
9
5
4
11 12 13 14
05068-016
1.414mm
2mm
250
μ
m
RAD
SP
ACE
=
405
μ
m
10
0μ
m
25
0μ
m
RAD
SPACE
=
40
5μ
m
250
μm RAD
SPACE = 433
μm
100
μm
250
μm RAD
SPACE = 433
μm
SPACE = 433
μm
100
μm
DETAIL A
A1 BALL PAD CORNER
1
ORIGINAL
NO CONNECTS
ADDITIONAL
NO CONNECTS
1
Figure 22. Layout Guidelines to Comply with IPC-221
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