参数资料
型号: AD5380BSTZ-3
厂商: Analog Devices Inc
文件页数: 31/40页
文件大小: 0K
描述: IC DAC 14BIT 40CHAN 3V 100LQFP
产品培训模块: Data Converter Fundamentals
DAC Architectures
产品变化通告: Redesign Change 28/Oct/2011
设计资源: 40 Channels of Programmable Voltage with Excellent Temperature Drift Performance Using AD5380 (CN0007)
Output Channel Monitoring Using AD5380 (CN0008)
标准包装: 1
设置时间: 6µs
位数: 14
数据接口: I²C,并联,串行
转换器数目: 40
电压电源: 单电源
功率耗散(最大): 125mW
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 100-LQFP
供应商设备封装: 100-LQFP(14x14)
包装: 托盘
输出数目和类型: 40 电压,单极
采样率(每秒): 125k
Data Sheet
AD5380
Rev. C | Page 37 of 40
UTILIZING THE AD5380 FIFO
The AD5380 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 cancella-
tion 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 s. Four-hundred channels requires the use of 10
AD5380s. 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 s. In FIFO mode, a complete group of 40
channels will update in 14.4 s. The time taken to update all
400 channels is 14.4 s + 9 × 1.6 s = 28.8 s. Figure 45 shows
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 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
s
1.6
s
14.4
s
14.4
s
1.6
s
FIFO DATA LOAD
GROUP A
FIFO DATA LOAD
GROUP B
OUTPUT UPDATE
TIME FOR GROUP A
1.6
s
14.4
s
FIFO DATA LOAD
GROUP J
OUTPUT UPDATE
TIME FOR GROUP J
OUTPUT UPDATE
TIME FOR GROUP B
03731-045
Figure 45. Using FIFO Mode 400 Channels Updated in Under 30 s
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