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AD5384BBC-5 Datasheet(PDF) 34 Page - Analog Devices

Part # AD5384BBC-5
Description  40-Channel, 3 V/5 V, Single-Supply, Serial, 14-Bit Voltage Output DAC
PDF  36 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD5384BBC-5 Datasheet(HTML) 34 Page - Analog Devices

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AD5384
Rev. A | Page 34 of 36
OPTICAL ATTENUATORS
Based on its high channel count, high resolution, monotonic
behavior, and high level of integration, the AD5384 is ideally
targeted at optical attenuation applications used in dynamic
gain equalizers, variable optical attenuators (VOA), and optical
add-drop multiplexers (OADMs). In these applications, each
wavelength is individually extracted using an arrayed wave
guide; its power is monitored using a photodiode, transimped-
ance amplifier, and an ADC in a closed-loop control system.
The AD5384 controls the optical attenuator for each
wavelength, ensuring that the power is equalized in all
wavelengths before being multiplexed onto the fiber. This
prevents information loss and saturation from occurring at
amplification stages further along the fiber.
ATTENUATOR
ATTENUATOR
ATTENUATOR
ATTENUATOR
AWG
AWG
FIBRE
FIBRE
DWDM
OUT
OPTICAL
SWITCH
11
12
1n–1
1n
DWDM
IN
AD5384,
40-CHANNEL,
14-BIT DAC
N:1 MULTIPLEXER
16-BIT ADC
CONTROLLER
TIA/LOG AMP
(AD8304/AD8305)
ADG731
(40:1 MUX)
AD7671
(0-5V, 1MSPS)
PHOTODIODES
ADD
PORTS
DROP
PORTS
Figure 39. OADM Using the AD5384 as Part of an Optical Attenuator



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