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Chapter 11 205
Peripheral Devices
N5102A Digital Signal Interface Module
The levels will degrade above the warranted level clock rates, but they may still be usable.
Serial Port Configuration Clock Rates
For a serial port configuration, the lower clock rate limit is determined by the word size (word size
and sample size are synonymous), while the maximum clock rate limit remains constant at 150 MHz
for LVTTL and CMOS logic types, and 400 MHz for an LVDS logic type.
The reverse is true for the sample rate. The lower sample (word) rate value of 1 kHz remains while
the upper limit of the sample rate varies with the word size. For example, a five-bit sample for an
LVTTL or CMOS logic type yields the following values in serial mode:
• Clock rate of 5 kHz through 150 MHz
• Sample rate of 1 kHz through 30 MHz
Refer to Table 11-3 and Table 11-4, for the serial clock rates.
Table 11-2 Warranted Parallel Input Level Clock Rates and Maximum Clock Rates
Logic Type Warranted Level Clock Rates Maximum Clock Rates (typical)
LVTTL and CMOS 100 MHz 100 MHz
LVDS 100 MHz 400 MHz
Table 11-3 Output Serial Clock Rates
Logic Type Minimum Rate Maximum Rate
LVDS 1 x (word size) kHz 400 MHz
LVTTL and CMOS 1 x (word size) kHz 150 MHz
Table 11-4 Input Serial Clock Rates
Logic Type Data Type Minimum Rate Maximum Rate
LVDS Samples 1 x (word size) kHz 400
Pre-FIR
Samples
1 x (word size) kHz
the smaller of: 50
a
x (word size) MHz
or
400 MHz
a.The maximum sample rate depends on the selected filter when the data rate is Pre-FIR Samples. Refer to “Input Mode” on page 218 for
more information.
LVTTL and CMOS N/A 1 x (word size) kHz 150 MHz