參數(shù)資料
型號(hào)： AD5380BST-5
廠商： ANALOG DEVICES INC
元件分類： DAC
英文描述： 32-Channel, 3 V/5 V, Single-Supply, 14-Bit, Voltage Output DAC
中文描述： PARALLEL, WORD INPUT LOADING, 8 us SETTLING TIME, 14-BIT DAC, PQFP100
封裝： 14 X 14 MM, MS-026BED, LQFP-100
文件頁(yè)數(shù)： 33/34頁(yè)
文件大?。?/td> 975K
代理商： AD5380BST-5
PRELIMINARY TECHNICAL DATA
REV. PrF 09/2003
AD5380
–33–
FIBRE
AD5380,
40-Channel,
14-Bit DAC
DW DM
IN
DW DM
OUT
FIBRE
ADD
PORTS
DROP
PORTS
Attenuator
Attenuator
Attenuator
Attenuator
AW G
AW G
.
.
.
.
.
.
.
.
.
N:1 M ultiplexer
TIA/LOG AM P
(AD8304/5)
16-BIT ADC
Photo-diodes
CONTROLLER
l
l
l
l
1
2
n-1
n
.
.
.
. . . .
. . . .
Optical
Sw itch
ADG731
(40:1 M UX)
AD7671
(0-5V, 1M SPS)
Figure 20 . OADM using the AD5380 as part of an Optical Attenuator
Optical Attenuators
The AD5380 based on its high channel count, high resolution, monotonic behaviour and high level of integration is ide-
ally targetted at optical attenuation applications used in dynamc gain equilizers, variable optical attenuators (VOA) and
Optical Add-Drop Mutliplexers (OADM). In these applications each wavelength is individually extracted using an ar-
rayed wavequide and its power monitored using a photo-diode, transimpedance amplifier and ADC in a close loop
control system. The AD5380 controls the optical attenuator for each wavelength ensuring that the power is equilized in
all wavelengths before being multiplexed onto the fibre. This prevents information loss and saturation from occurring at
amplification stages further along the fibre.
Utilizing the AD5380 FIFO
The AD5380 FIFO mode optimizes total system update rate in applications where a large number of channels need to be
updated. FIFO mode is only available when the parallel interface mode is selected. The FIFOEN pin is used to enable
the FIFO. The status of the FIFOEN pin is sampled during the initialisation sequence, therefore the FIFO status can
only be changed by resetting the device. An example of where a large number of channels need to be updated in a short
period of time would be in a telescope that provides for the cancellation of atmospheric distortion. In these systems as
many as 400channels need to be updated in a window of 40us. 400 channels necessitates the use of 10* AD5380 devices.
With FIFO mode enabled the data write cycle time is 40ns, therefore each group consisting of 40 channels can be fully
loaded 1.6us. In FIFO mode a complete group of 40 channels will update in 14.4us. Therefore the time taken to update
all 400channels will equate to 14.4us +9*1.6us = 28.8us. Figure 21 shows a graphical view of the FIFO operation
scheme.
GROUP A
Chnls 0-39
GROUP B
Chnls 40-79
GROUP C
Chnls 80-119
GROUP D
Chnls 120-159
GROUP E
Chnls 160-199
GROUP F
Chnls 200-239
GROUP H
Chnls 280-319
GROUP G
Chnls 240-279
GROUP I
Chnls 320-359
Time to Update 400 Channels = 28.8us
GROUP J
Chnls 360-399
1.6us
14.4us
FIFO DATA LOAD
Group B
1.6us
FIFO DATA LOAD
Group A
Output Update
Time for Group A
Output Update
Time for Group B
14.4us
FIFO DATA LOAD
Group J
1.6us
Output Update
Time for Group J
14.4us
Figure 21. Using FIFO mode 400 Channels Updated in under 30us.
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