ISL54207 Datasheet, PDF (7/14 Pages) Intersil Corporation – Low Voltage, Dual SPDT, USB/CVBS/ Audio Switches, with Negative Signal Capability

ISL54207
Test Circuits and Waveforms (Continued)
V_DD
C
CTRL
NCx or NOx
SIGNAL
GENERATOR
V_DD
C
CTRL
NCx
COMx
75Ω
IMPEDANCE
ANALYZER
COMx
GND
VBUS
V_BUSL or
V_BUSH
0V or Float
VBUS
ANALYZER
R_L
COMx
R or L
GND
N.C.
Repeat test for all switches.
FIGURE 5. CAPACITANCE TEST CIRCUIT
Signal direction through switch is reversed, worst case
values are recorded. Repeat test for all switches
FIGURE 6. AUDIO CROSSTALK TEST CIRCUIT
DIN+
DIN-
OUT+
OUT-
t_ri
10%
90%
50%
90%
t_{skew_i}
50%
10%
t_fi
t_ro
90%
10%
90%
50%
t_{skew_o}
50%
t_f0
10%
FIGURE 7A. MEASUREMENT POINTS
V_{DD C}
V_BUSH
DIN+
DIN-
15.8Ω
143Ω
15.8Ω
143Ω
CTRL
VBUS
COM1
COM2
NO1
NO2
OUT+
C_L
45Ω
OUT-
C_L
45Ω
GND
|tro - tri| Delay Due to Switch for Rising Input and Rising Output Signals.
|tfo - tfi| Delay Due to Switch for Falling Input and Falling Output Signals
|tskew_0| Change in Skew through the Switch for Output Signals.
|tskew_i| Change in Skew through the Switch for Input Signals.
FIGURE 7. SKEW TEST
FIGURE 7B. TEST CIRCUIT
7
FN6403.0
December 5, 2006