AD5820 データシートの表示（PDF） - Analog Devices
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AD5820 Datasheet PDF : 6 Pages
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to the desired code and therefore the desired current.
Example: If the user wishes to perform a Full Scale Transition of 1023 code the output of the AD5820 will
increment by fourteen 64-code steps (until it is between 16-128 codes from target value). The AD5820 will
then effectively decelerate in terms of output current step size and approach the target output current in
seven 16-code steps followed by one final step to fullscale.
(64 Code Steps * 14) + (16 Code Steps * 7) + (Step to Final DAC code * 1) = 22 steps. See Figure 16 below.
Table 2. Slew Rate Control Mode and Single Step Transition Time Truth Table.
Mode S3
S2 S1 S0 Single Step
Full Scale
Transition Time Transition Time
Mode 0 X
X
X
X
TBD µs
TBD µs
Mode 1 0
0
0
1
50µs
51.15ms
0
0
1
0
100µs
102.30ms
0
0
1
1
200µs
204.6ms
0
1
0
0
400µs
409.2ms
0
1
0
1
800µs
818.4ms
0
1
1
0
1.6ms
1636.8ms
0
1
1
1
3.2ms
3273.6ms
Mode 2 1
0
0
0
TBD µs
TBD µs
1
0
0
1
50µs
1.1ms
1
0
1
0
100µs
2.2ms
1
0
1
1
200µs
4.4ms
1
1
0
0
400µs
8.8ms
1
1
0
1
800µs
17.6ms
1
1
1
0
1.6ms
35.2ms
1
1
1
1
3.2ms
70.4ms
64/16 Ramp Mode
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