EVAL-AD5383EB AD [Analog Devices], EVAL-AD5383EB Datasheet - Page 35

• Manufacturer Part Number: EVAL-AD5383EB
• Description: 32-Channel, 3 V/5 V, Single-Supply, 12-Bit, Voltage Output DAC
• Manufacturer: AD [Analog Devices]

OPTICAL ATTENUATORS
Based on its high channel count, high resolution, monotonic
behavior, and high level of integration, the AD5383 is ideally
targeted at optical attenuation applications used in dynamic
gain equalizers, variable optical attenuators (VOA), and optical
add-drop multiplexers (OADM). In these applications, each
wavelength is individually extracted using an arrayed wave
INPUT
A/B
DATA
DWDM
IN
REGISTER
FIBRE
INPUT
AWG
Figure 43. OADM Using the AD5383 as Part of an Optical Attenuator
11
12
1n–1
1n
PORTS
ADD
OPTICAL
REGISTER
REGISTER
SWITCH
DATA
DATA
A
B
Figure 42. Toggle Mode Function
32-CHANNEL,
12-BIT DAC
CONTROLLER
PORTS
DROP
AD5383,
Rev. 0 | Page 35 of 40
ATTENUATOR
ATTENUATOR
ATTENUATOR
ATTENUATOR
REGISTER
DAC
guide; its power is monitored using a photodiode, transimped-
ance amplifier and ADC in a closed-loop control system. The
AD5383 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.
N:1 MULTIPLEXER
16-BIT ADC
PHOTODIODES
12-BIT DAC
TIA/LOG AMP
(AD8304/AD8305)
ADG731
(32:1 MUX)
AD7671
(0-5V, 1MSPS)
AWG
V
LDAC
CONTROL INPUT
FIBRE
OUT
DWDM
OUT
AD5383