ISL54205B Datasheet, PDF (8/16 Pages) Intersil Corporation – MP3/USB 2.0 High Speed Switch with Negative Signal Handling

ISL54205B
Test Circuits and Waveforms (Continued)
V_DD
C
CTRL
AUDIO OR USB
SIGNAL
GENERATOR
V_DD
C
CTRL
L OR R
COMx
32Ω
IMPEDANCE
ANALYZER
COMx
GND
V_BUS
V_BUSL OR
V_BUSH
Repeat test for all switches.
FIGURE 5. CAPACITANCE TEST CIRCUIT
V_BUS
0V OR FLOAT
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%
90%
50%
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
V_BUS
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
8
FN6557.0
September 25, 2007