ISL54217_14 Datasheet, PDF (9/24 Pages) Intersil Corporation – USB 2.0 High-Speed x 2 Channels/Stereo Audio Dual SP3T (Dual 3-to-1 Multiplexer)

ISL54217
Test Circuits and Waveforms (Continued)
t_ri
V_{DD C}
DIN+
DIN-
OUT+
OUT-
90%
10% ^50%
t_{skew_i}
90% _50%
10%
t_fi
t_ro
90%
10%
90%
50%
t_{skew_o}
50%
t_f0
10%
FIGURE 7A. MEASUREMENT POINTS
0V
V_DD
DIN+
15.8Ω
143Ω
DIN-
15.8Ω
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 7B. TEST CIRCUIT
FIGURE 7. SKEW TEST
AUDIO PRECISION
SYSTEM II CASCADE
ANALYZER
CHA CHB
3.3V
V_DD
R_LOAD
R_LOAD
COM-
COM+
L
CLICK
AND
R
POP
C0 C1
GND
0V TO 1.25V
DC STEP
OR
1.25V TO 0V
DC STEP
0V 0V
ALL OFF MODE
Set Audio Analyzer for Peak Detection, 32 Samples/Sec, Aweighted Filter, Manual Range 1X/Y, Units to dBV
FIGURE 8. CLICK AND POP TEST CIRCUIT
9
FN6817.4
June 17, 2010