AD5535 Analog Devices, AD5535 Datasheet - Page 14

• Manufacturer Part Number: AD5535
• Description: 32-Channel, 14-Bit DAC with Fullscale Output Voltage Programmable from 50 V to 200 V
• Manufacturer: Analog Devices

Specifications of AD5535

• Resolution (bits): 14bit
• Dac Update Rate: 1.2MSPS
• Dac Settling Time: 65µs
• Max Pos Supply (v): +5.25V
• Single-supply: No
• Dac Type: Voltage Out
• Dac Input Format: Ser

AD5535
APPLICATIONS
MEMS MIRROR CONTROL APPLICATION
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
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.
ORIGINAL
NO CONNECTS
ADDITIONAL
NO CONNECTS
Figure 21, with a high resolution ADC and DSP.
A1 BALL PAD CORNER
1
1
1
2
1
3
4
5
6
7
8
9
10
Figure 22. Layout Guidelines to Comply with IPC-221
11 12 13 14
1
B
C
D
E
F
J
K
L
M
N
P
A
G
H
Rev. A | Page 14 of 16
1.414mm
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.
REF198
(4.096V)
AD5535
14-BIT DAC
14-BIT DAC
REF_IN
+5V
V
Figure 21. AD5535 in a MEMS-Based Optical Switch
+
–5V
+210V
V
V
–
PP
V
V
OUTPUT RANGE
0V TO 200V
OUT
OUT
0
ADSP-21065L
31
ACTUATORS
DETAIL A
MIRROR
ARRAY
MEMS
FOR
SPACE = 433μm
SPACE = 433μm
SPACE = 433μm
250μm RAD
250μm RAD
32-TO-1 MUX
4-TO-1 MUX
(ADG739)
(ADG732)
SENSOR
OR
+
100μm
100μm
ADC (AD7856)
ADC (AD7671)
8-CHANNEL
2mm
CHANNEL
SINGLE-
OR