abaco systems CEI-520 - CEI-520;520 A DAC Definitions

Parametric Voltage Programming CEI-420/420A DAC Definitions
CEI-100/CEI-200/CEI-x20 User’s Manual 175
Table 49. CEI-220 DAC Register Scale Factors
DAC
Function
Scaling factor
#1
Receiver threshold channels 1 - 4 (sets symmetric
positive and negative thresholds)
Thres = 10 * (2.5V – Vdac)
#2
Receiver threshold channels 5 - 8 (sets symmetric
positive and negative thresholds)
Thres = 10 * (2.5V – Vdac)
#3
Receiver threshold channels 9 - 10 (sets symmetric
positive and negative thresholds)
Thres = 10 * (2.5V – Vdac)
#4
Receiver threshold channels 11 - 12 (sets
symmetric positive and negative thresholds)
Thres = 10 * (2.5V – Vdac)
#5
Discrete input threshold
Thres = 10 * Vdac
#6
ARINC transmit voltage for parametric testing
Differential output voltage = 2 *
Vdac
#7
Spare
#8
Spare
CEI-420/420A DAC Definitions
The CEI-420 and the CEI-420A don’t have adjustable output, input or
discrete thresholds. Therefore, they have no DAC settings.
CEI-520/520A DAC Definitions
Table 50. CEI-520/520A DAC Register Scale Factors
DAC
Function
Scale factor
#1
Receiver threshold channels 1 – 4 positive threshold
Thres = 10 * (2.5V – Vdac)
#2
Receiver threshold channels 1 – 4 negative threshold
Thres = 10 * (2.5V – Vdac)
#3
Receiver threshold channels 5 – 6 positive threshold
Thres = 10 * (2.5V – Vdac)
#4
Receiver threshold channels 5 – 6 negative threshold
Thres = 10 * (2.5V – Vdac)
#5
Receiver threshold channels 7 – 8 positive threshold
Thres = 10 * (2.5V – Vdac)
#6
Receiver threshold channels 7 – 8 negative threshold
Thres = 10 * (2.5V – Vdac)
#7
Transmit voltage for parametric testing (channels 1 - 8)
Differential output voltage = 2 * Vdac
#8
Spare
#9
Receiver threshold channels 9 - 12 positive threshold
Thres = 10 * (2.5V – Vdac)
#10
Receiver threshold channels 9 - 12 negative threshold
Thres = 10 * (2.5V – Vdac)
#11
Receiver threshold channels 13 - 14 positive threshold
Thres = 10 * (2.5V – Vdac)
#12
Receiver threshold channels 13 - 14 negative threshold
Thres = 10 * (2.5V – Vdac)
#13
Receiver threshold channels 15 - 16 positive threshold
Thres = 10 * (2.5V – Vdac)
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