Figures 9 and 10 show the SREF at 1.5 V and 2.0 V respectively. The same behavior is observed where the current shuts
off quickly as the source voltage gets within about 0.5 V of the SREF voltage.
0 0.25 0.5 0.75
0.0E+00
-2.0E-03
-4.0E-03
-6.0E-03
-8.0E-03
VDDref = 3.3v
VDDpass = 3.3v
RDn = 150 ohms
RDref = 200k
-1.0E-02
-1.2E-02
-1.4E-02
-1.6E-02
-1.8E-02
-2.0E-02
-2.2E-02
1 1.25 1.5 1.75
VSn (V)
VSref = 2.5v
2 2.25 2.5
25 deg C
85 deg C
-40 deg C
Figure 11. V-I Electrical Characteristics at VSREF = 2.5 Volt and VDDREF = 3.3 Volt
0 0.25 0.5 0.75
0.0E+00
-2.0E-03
-4.0E-03
-6.0E-03
-8.0E-03
VDDref = 4.0v
VDDpass = 3.3v
RDn = 150 ohms
RDref = 200k
-1.0E-02
-1.2E-02
-1.4E-02
-1.6E-02
-1.8E-02
-2.0E-02
-2.2E-02
1 1.25 1.5 1.75
VSn (V)
VSref = 2.5v
2 2.25 2.5
25 deg C
85 deg C
-40 deg C
Figure 12. V-I Electrical Characteristics at VSREF = 2.5 Volt and VDDREF = 4.0 Volt
10