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34951A 4-Channel Isolated D/A Converter with Waveform Memory Module
Waveform (Trace) Mode
Using the internal waveform point storage, you can output provided sine,
square, or ramp and triangle wave shapes, or define your own wave shape
with up to 512,000 points. The module can output points with a settling
time of 40
The on- board memory provides storage for you to create up to 32 voltage
or current waveforms. You can apply a different waveform to each channel
to output. Or you can apply the same waveform to more than one channel.
For each channel you can designate the gain, frequency, and/or offset for
its output.
The waveforms are stored in volatile memory. Therefore, whenever power
to the 34980A is cycled, the volatile memory empties of data it has
contained.
The waveform feature of the 34951A is not intended as a full- featured
substitute for a function generator, but as a means of storing
point- to- point updates.
Clock In
You can configure each DAC channel on the module to synchronize off
either an internally- generated 20 MHz clock or the positive edge of an
external user- supplied clock.
An external clock must be less than 10 MHz or indeterminate behavior
will result. Additionally, as the maximum point- to- point update rate of the
DACs is 200 kHz, if you configure a DAC to run off an external clock, you
will need to ensure that the correct clock divisor is also configured for
that DAC. For example, if you supply a 10 MHz external clock, the
minimum clock divisor is 50 because the maximum update rate is 200
kHz. If a clock divisor less than the minimum is configured, indeterminate
behavior will results. Thresholds for the Clock In are 5 V TTL tolerant.
Clock Out
There is one clock output on the DAC module, which you can configure to
output at frequencies up to 10 MHz. Since it uses a 16- bit clock divisor,
the available output frequencies range in steps of 20 MHz/2
minimum output frequency of 305 Hz. The output impedance of the Clock
Out is 50
2
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s and a 200 kHz point- to- point update rate.
The line between external Clock Out and external Clock In is shared.
N O T E
You can use the external Clock Out to provide the external Clock In
signal. However, both a user-supplied external clock and the
module's Clock Out cannot drive the line at the same time.
Agilent 34951A 4-Channel Isolated D/A Converter Module User's Guide
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