20
TIMEBASE
DATA
D1
D253 D254
Acquisition
In Progress
Trigger
Acquisition initiates following this clock edge
D2
5
5
2
D
4
D
3
D
D256
Analog
signal
Trigger mode = post-trigger, DataCnt = 256, ScanIntrv = 1
Figure 3-12: Basic Digitizer Acquisition Timing
To achieve sampling rates other than 200MS/s, a number for scan interval counter needs only be
specified. For example, if the scan interval counter is set as 2, the equivalent sampling rate is 200MS/
s / 2 = 100MS/s. If as 3, the equivalent sampling rate is 200MS/s /3 = 66.66MS/s, and vice versa. The
scan interval counter is 16 bits in width, therefore the lowest sampling rate is 3.051KS/s (200MS/s
/ 65535).
TIMEBASE
DATA
D1
Acquisition
In Progress
Trigger
Acquisition is initiated following this clock edge
D1
ScanIntrv = 1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D2
D3
D4
D5
D6
D1
4
D
3
D
2
D
ScanIntrv = 2
ScanIntrv = 3
Figure 3-13: Varying Sampling Rates by Adjusting Scan Interval Counter
