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参数资料
| 型号： | AD5381 |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | 40-Channel, 3 V/5 V, Single-Supply, 12-Bit, Voltage Output DAC |
| 中文描述： | 40通道，3伏/ 5 V，单电源，12位，电压输出DAC |
| 文件页数： | 35/36页 |
| 文件大小： | 1200K |
| 代理商： | AD5381 |
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AD5381
OPTICAL ATTENUATORS
Based on its high channel count, high resolution, monotonic
behavior, and high level of integration, the AD5381 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
guide; its power is monitored using a photodiode, transimped-
ance amplifier and ADC in a closed-loop control system. The
AD5381 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.
Rev. A | Page 35 of 36
UTILIZING THE AD5381 FIFO
The AD5381 FIFO mode optimizes total system update rates in
applications where a large number of channels need to be
updated. FIFO mode is only available when parallel interface
mode is selected. The FIFO_EN pin is used to enable the FIFO.
The status of FIFO_EN is sampled during the initialization
sequence. Therefore, the FIFO status can only be changed by
resetting the device. In a telescope that provides for the cancel-
lation of atmospheric distortion, for example, a large number of
channels need to be updated in a short period of time. In such
systems, as many as 400 channels need to be updated within
40 μs. Four-hundred channels requires the use of 10 AD5381s.
With FIFO mode enabled, the data write cycle time is 40 ns;
therefore, each group consisting of 40 channels can be fully
loaded in 1.6 μs. In FIFO mode, a complete group of 40 chan-
nels will update in 14.4 μs. The time taken to update all 400
channels is 14.4 μs + 9 × 1.6 μs = 28.8 μs. Figure 44 shows the
FIFO operation scheme.
ATTENUATOR
ATTENUATOR
ATTENUATOR
ATTENUATOR
AWG
AWG
FIBRE
FIBRE
DWDM
OUT
OPTICAL
SWITCH
11
12
1n–1
1n
DWDM
IN
AD5381,
40-CHANNEL,
12-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
0
Figure 43. OADM Using the AD5381 as Part of an Optical Attenuator
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 G
CHNLS
240-279
GROUP H
CHNLS
280-319
GROUP I
CHNLS
320-359
GROUP J
CHNLS
360-399
TIME TO UPDATE 400 CHANNELS = 28.8
μ
s
1.6
μ
s
14.4
μ
s
14.4
μ
s
1.6
μ
s
FIFO DATA LOAD
GROUP A
FIFO DATA LOAD
GROUP B
OUTPUT UPDATE
TIME FOR GROUP A
1.6
μ
s
14.4
μ
s
FIFO DATA LOAD
GROUP J
OUTPUT UPDATE
TIME FOR GROUP J
OUTPUT UPDATE
TIME FOR GROUP B
0
Figure 44. Using FIFO Mode 400 Channels Updated in Under 30 μs
相关PDF资料 |
PDF描述 |
|---|---|
| AD5381BST-3 | 40-Channel, 3 V/5 V, Single-Supply, 12-Bit, Voltage Output DAC |
| AD5381BST-3-REEL | CONNECTOR ACCESSORY |
| AD5381BST-5 | 32-Channel, 3 V/5 V, Single-Supply, 14-Bit, Voltage Output DAC |
| AD5381BST-5-REEL | 40-Channel, 3 V/5 V, Single-Supply, 12-Bit, Voltage Output DAC |
| AD5382BST-3-REEL | CONNECTOR ACCESSORY |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ad5381bst-3 | 制造商:Rochester Electronics LLC 功能描述:32/40-CHANNEL 3V/5V SINGLE SUPPLY 12/14-BIT VOUT DAC - Bulk 制造商:Analog Devices 功能描述: |
| AD5381BST-3-REEL | 制造商:Analog Devices 功能描述:DAC 40-CH Resistor-String 12-bit 100-Pin LQFP T/R |
| AD5381BST-5 | 制造商:Analog Devices 功能描述:DAC 40-CH Resistor-String 12-bit 100-Pin LQFP |
| AD5381BST-5-REEL | 制造商:Analog Devices 功能描述:DAC 40-CH Resistor-String 12-bit 100-Pin LQFP T/R |
| AD5381BSTZ-3 | 功能描述:IC DAC 12BIT 40CHAN 3V 100LQFP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 标准包装:1 系列:- 设置时间:4.5µs 位数:12 数据接口:串行，SPI? 转换器数目:1 电压电源:单电源 功率耗散（最大）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOICN 包装:剪切带 (CT) 输出数目和类型:1 电压，单极；1 电压，双极 采样率（每秒）:* 其它名称:MCP4921T-E/SNCTMCP4921T-E/SNRCTMCP4921T-E/SNRCT-ND |
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