Datasheet

AD5412/AD5422 Data Sheet
Rev. I | Page 36 of 44
DAC
I
OUT
BOOST
CAP1 CAP2
C1
R1
C2
AV
DD
4kΩ
12.5kΩ
40Ω
06996-063
Figure 74. I
OUT
Filter Circuitry
0
5
–0.5
0
0.5
1.0 1.5
2.0 2.5
3.0
3.5 4.0
1
0
1
5
2
0
2
5
OUTPUT CURRENT (mA)
TIM
E
(m
s
)
T
A
=
25
°
C
AV
DD
=
24V
R
LOAD
=
30
0Ω
0
69
96
-
14
2
N
O CA
P
AC
IT
O
R
10
nF
ON
CAP
1
10nF
ON C
AP2
47
nF O
N CAP
1
47
nF O
N CA
P2
Figure 75. Slew Controlled 4 mA to 20 mA Output Current Step Using
External Capacitors on the CAP1 and CAP2 Pins
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
–1 0 1 2 3 4 5 6 7
8
OUTPUT CURRENT (mA)
TIME (ms)
T
A
= 25°C
AV
DD
= 24V
R
LOAD
= 300Ω
NO EXTERNAL CAPS
10nF ON CAP1
10nF ON CAP2
06996-043
Figure 76. Smoothing Out the Steps Caused by the Digital Slew
Rate Control Feature
Table 24. Programmable Slew Time Values in Seconds for a Full-Scale Change on Any Output Range
Update Clock
Frequency (Hz)
Step Size (LSB)
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