ISL54214 Datasheet, PDF (9/22 Pages) Intersil Corporation – USB 2.0 High-Speed x 2 Channels/Stereo Audio Dual SP3T Dual 3-to-1 Multiplexer

ISL54214
Test Circuits and Waveforms (Continued)
V_DD
C
V_DD
C
CTRL
AUDIO OR USB
SIGNAL
GENERATOR
CTRL
L OR R
COMx
32Ω
IMPEDANCE
ANALYZER
V_Cx
COMx
GND
V_CxL OR
V_CxH
Repeat test for all switches.
FIGURE 5. CAPACITANCE TEST CIRCUIT
V_Cx
0V OR FLOAT
ANALYZER
COMx
R OR L
N.C.
GND
32Ω
FIGURE 6. AUDIO CROSSTALK TEST CIRCUIT
DIN+
DIN-
OUT+
OUT-
t_ri
90%
10% ^50%
t_{skew_i}
90%
50%
10%
t_fi
t_ro
90%
10%
90%
50%
t_{skew_o}
50%
t_f0 ^10%
V_DD
C
0V
V_DD
15.8Ω
DIN+
143Ω
15.8Ω
DIN-
143Ω
C0 ^VDD
C1
COM+
COM-
D+
OUT+
C_L 45Ω
D-
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 7A. MEASUREMENT POINTS
FIGURE 7. SKEW TEST
FIGURE 7B. TEST CIRCUIT
9
FN6816.3
June 28, 2010