PACVGA200_11 Datasheet, PDF (6/8 Pages) ON Semiconductor – VGA Port Companion Circuit

PACVGA200
TEST CIRCUIT INFORMATION
Average Current through V_CC4 (I_CC4)
The circuit in Figure 1 was used to characterize I_CC4 current as SYNC_IN signal frequency varies. A square wave signal
was connected to the input of one of the SYNC buffers (i.e. pin 19 or pin 21). The frequency of this signal was varied between
0 and 100 kHz. The risetime and falltime was kept constant at 10 ns. Three different values of C1 were used: 0 pF, 50 pF and
100 pF. The results are plotted in Figure 2.
V_CC4
+5 V
3.3 V
0V
SYNC_IN
I_CC4
SYNC_OUT
C1
Figure 1. Sync Buffer I_CC4 Test Circuit
Frequency (kHz)
Figure 2. I_CC4 vs. SYNC_IN Frequency Performance Data
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