User manual

User Manual: Agilent Acqiris 10-bit Digitizers Page 22 of 27
3.10. Electrical, Environmental and Physical Specifications
3.10.1. Electrical
PCI
Rev.
Max. Power
Consumption (W)
Current Requirements (A)
Model
+12 V
+5 V
+3.3 V
-12 V
DC122
Default
Memory
2.2 34 0.12 3.8 3.9 0.015
DC122
Optional
Memory
2.2 43 0.12 3.8 6.8 0.015
DC152
Default
Memory
2.2 35 0.12 4.0 3.9 0.015
DC152
Optional
Memory
2.2 44 0.12 4.0 6.8 0.015
DC2x2
Default
Memory
2.2 65 0.1 7.4 7.9 0.033
DC2x2
Optional
Memory
2.2 84 0.1 7.4 13.8 0.033
The power and current values have been increased by 10% to take into account possible variations of the crate
voltages and signal dependent effects. The current requirements of the DC222 and DC252 models are only slightly
lower than the DC282 case. The differences between the different front end options are also small; a single Standard
or HZ channel pulls ~0.3 A @ +5 V.
The electrical requirements shown above can impose loading limitations in the cPCI crate. In the extreme case where
a PC503 processor is present in an Acqiris crate the following limits apply:
Crate DC1x2
all models
DC2x2
Default
Memory
DC2x2
Optional
Memory
CC103
None
None
None
CC105
None
None
3
CC108
normal and
low power
None 4 3
CC108-600
None
6
3
CC108-800
None
None
None
CC121
None
14
8
If a third party crate is being used please check that the current drawn at 3.3 V does not sag below the effective PCI
allowed tolerance at the beginning of the acquisition. Acqiris 3-, 5-, and 8-slot crates should be modified at the
factory for use with these modules.
The digitizers can use the PCI Bus at 32-bit − 33 MHz, all models, or at 64-bit − 66 MHz, DC2x2 only . The latter
allows data to be transferred with DMA at average rates up to 350 MB/s with appropriate hardware under Windows
and Linux. Otherwise, the DMA transfer rates are limited to ~100 MB/s. The CompactPCI modules are compatible
for either V I/O = 3.3 V or 5V.