ADLINK PXI-9527 - Manual (Page 38)

28 Operations
3.3.1 Analog Output Front-End Configuration
Differential and Pseudo-Differential Output Configuration
Differential output provides voltage to the anode and cathode
outputs of the BNC connector according to DAC output voltage
difference between the two. If the DUT inputs are ground-refer-
enced, the differential output mode can be used for the elimina-
tion of measurement errors caused by ground loops.
If the DUT inputs are in a floating system, such as a floating
earphone, pseudo-differential output mode provides a refer-
ence ground connected to the cathode output of the BNC
through a 50 Ω resistor. This prevents the floating system from
drifting beyond its input common-mode range.
The recommended configurations for DUT input reference
types are as follows.
3.3.2 Output Range and Data Format
Ideal PXI-9527 transfer characteristics for various input codes ver-
sus output voltages are as follows. The PXI-9527 data format is
2’s-complement.
DUT Input Reference Type Card Configuration
Floating Pseudo-differential
Ground-reference
Differential
Table 3-5: Output Configuration
Description
Digital
Input Code
Bipolar Analog Output
Full-scale
range
N/A ±10 V ±1 V ±0.1 V
Least
significant bit
N/A 1.19uV 0.119uV 0.012uV
FSR-1LSB 7FFFFF 9.99999881 V 0.999999881 V 0.099999988 V
Midscale
+1LSB
000001 1.19 uV 0.119 uV 0.012 uV
Midscale 000000 0 V 0 V 0 V
Table 3-6: Digital Input Code and Analog Output Range