参数资料
型号: EVAL-AD5420EBZ
厂商: Analog Devices Inc
文件页数: 17/32页
文件大小: 0K
描述: BOARD EVALUATION FOR AD5420
标准包装: 1
DAC 的数量: 1
位数: 16
数据接口: 串行
设置时间: 10µs
DAC 型: 电流
工作温度: -40°C ~ 85°C
已供物品:
已用 IC / 零件: AD5420
AD5410/AD5420
Data Sheet
Rev. F | Page 24 of 32
The time it takes for the output current to slew over a given
output range can be expressed as follows:
Size
LSB
Frequency
Clock
Update
Size
Step
Change
Output
Time
Slew
×
=
(1)
where:
Slew Time is expressed in seconds.
Output Change is expressed in amps.
When the slew rate control feature is enabled, all output
changes change at the programmed slew rate. If the CLEAR
pin is asserted, the output slews to the zero-scale value at the
programmed slew rate. The output can be halted at its current
value with a write to the control register. To avoid halting the
output slew, the slew active bit can be read to check that the
slew has completed before writing to any of the AD5410/
AD5420 registers (see Table 17). The update clock frequency for
any given value is the same for all output ranges. The step size,
however, varies across output ranges for a given value of step
size because the LSB size is different for each output range.
Table 20 shows the range of programmable slew times for a full-
scale change on any of the output ranges. The values in Table 20
were obtained using Equation 1. The digital slew rate control
feature results in a staircase formation on the current output, as
shown in Figure 47. Figure 47 also shows how the staircase can
be removed by connecting capacitors to the CAP1 and CAP2
pins, as described in the IOUT Filtering Capacitors section.
Table 20. Programmable Slew Time Values in Seconds for a Full-Scale Change on Any Output Range
Step Size (LSBs)
Update Clock Frequency (Hz)
1
2
4
8
16
32
64
128
257,730
0.25
0.13
0.06
0.03
0.016
0.008
0.004
0.0020
198,410
0.33
0.17
0.08
0.04
0.021
0.010
0.005
0.0026
152,440
0.43
0.21
0.11
0.05
0.027
0.013
0.007
0.0034
131,580
0.50
0.25
0.12
0.06
0.031
0.016
0.008
0.0039
115,740
0.57
0.28
0.14
0.07
0.035
0.018
0.009
0.0044
69,440
0.9
0.47
0.24
0.12
0.06
0.03
0.015
0.007
37,590
1.7
0.87
0.44
0.22
0.11
0.05
0.03
0.014
25,770
2.5
1.3
0.64
0.32
0.16
0.08
0.04
0.020
20,160
3.3
1.6
0.81
0.41
0.20
0.10
0.05
0.025
16,030
4.1
2.0
1.0
0.51
0.26
0.13
0.06
0.03
10,290
6.4
3.2
1.6
0.80
0.40
0.20
0.10
0.05
8280
7.9
4.0
2.0
1.0
0.49
0.25
0.12
0.06
6900
9.5
4.8
2.4
1.2
0.59
0.30
0.15
0.07
5530
12
5.9
3.0
1.5
0.74
0.37
0.19
0.09
4240
15
7.7
3.9
1.9
0.97
0.48
0.24
0.12
3300
20
9.9
5.0
2.5
1.24
0.62
0.31
0.16
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