abaco systems CEI-520 - CEI-620 DAC Definitions; Table 51. DAC Register Functions and Scaling Factors (CEI-620); Table 52. DAC Register Functions and Scaling Factors (CEI-820)

Parametric Voltage Programming CEI-620 DAC Definitions
CEI-100/CEI-200/CEI-x20 User’s Manual 176
DAC
Function
Scale factor
#14
Receiver threshold channels 15 - 16 negative threshold
Thres = 10 * (2.5V – Vdac)
#15
Transmit voltage for parametric testing (channels 9 - 16)
Differential output voltage = 2 * Vdac
#16
Spare
CEI-620 DAC Definitions
Table 51. DAC Register Functions and Scaling Factors (CEI-620)
DAC
Function
Scale factor
#1
Receiver threshold channel 1 positive threshold
Thres = 10 * (2.5V – Vdac)
#2
Receiver threshold channel 1 negative threshold
Thres = 10 * (2.5V – Vdac)
#3
Receiver threshold channels 2 - 4 positive threshold
Thres = 10 * (2.5V – Vdac)
#4
Receiver threshold channels 2 - 4 negative threshold
Thres = 10 * (2.5V – Vdac)
#5
Receiver threshold channels 5 - 16 positive threshold
Thres = 10 * (2.5V – Vdac)
#6
Receiver threshold channels 5 - 16 negative threshold
Thres = 10 * (2.5V – Vdac)
#7
Transmit voltage for parametric testing (channels 1 - 4)
Differential output voltage = 2 * Vdac
#8
Secondary transmit voltage for parametric testing (useful
for 561, set to 0xFF, not currently used)
Unipolar output voltage = 2.40 * Vdac
CEI-820 DAC Definitions
Table 52. DAC Register Functions and Scaling Factors (CEI-820)
DAC
Function
Scale factor
#1
Receiver #1 positive and negative threshold
Thres = 10 * (Vdac – 2.5V)
#2
Receiver #2 positive and negative threshold
Thres = 10 * (Vdac – 2.5V)
#3
Receiver #3 positive and negative threshold
Thres = 10 * (Vdac – 2.5V)
#4
Receiver #4 positive and negative threshold
Thres = 10 * (Vdac – 2.5V)
#5
Receiver #5 positive and negative threshold
Thres = 10 * (Vdac – 2.5V)
#6
Receiver #6 positive and negative threshold
Thres = 10 * (Vdac – 2.5V)
#7
Receiver #7 positive and negative threshold
Thres = 10 * (Vdac – 2.5V)
#8
Receiver #8 positive and negative threshold
Thres = 10 * (Vdac – 2.5V)
#9
Reserved for future use.
On the CEI-820, the negative receiver threshold is automatically set to
the additive inverse of the positive receiver threshold.
Note:
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