ISL54212 Datasheet, PDF (7/15 Pages) Intersil Corporation – MP3/USB 2.0 High Speed Switch with Negative Signal Handling

ISL54212
Test Circuits and Waveforms (Continued)
V_DD
C
V_DD
C
IMPEDANCE
ANALYZER
CTRL
AUDIO OR USB
IN
COMx
GND
0V or
V_DD
Repeat test for all switches.
FIGURE 5. CAPACITANCE TEST CIRCUIT
SIGNAL
GENERATOR
VDD
CTRL
L OR R
COMx
32Ω
IN
ANALYZER
COMx
R OR L
NC
GND
R_L
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}
0V
DIN+
DIN-
15.8Ω
143Ω
15.8Ω
143Ω
CTRL
IN
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 7. SKEW TEST
FIGURE 7B. TEST CIRCUIT
7
FN6556.0
September 18, 2007