TDSUSBF Test Fixture
TDSUSBF USB 2.0 Compliance Test Fixture Instructions
7
Use Table 2 and Figure 1 on page 6 to prepare the fixture for specific tests.
Each test fixture circuit (except the active and passive loads) contains a 4-pin
header. The outer pins are ground and the inner two pins are labeled D+ and D--.
Table 2: USB signal connections and switch settings
Test
1
Upstream (Host)
connector number/type
Downstream (DUT)
connector number/type
Switch number and setting
Host TDR
2
J20 / A dongle
N/A
N/A
Device TDR
2
J26 / B receptacle
J19 / A receptacle
S6 switch to INIT, and then TEST
Host
Signal Quality
J16 / A dongle
N/A
N/A
HS Signal
Quality Upstream
J37 / B receptacle
J34 / A receptacle
S6 switch to INIT, and then TEST
LS, FS Signal
Quality Up-
stream, Adjacent
Trigger
3
J10, J14 / A receptacle
J7, J12 / A dongle
S5 switch to On
HS Receiver
Sensitivity
2
J32 / B receptacle
J28 / A receptacle
S6 switch to INIT, and then TEST
LS, FS Down-
stream
J72 / B receptacle
J70 / A receptacle
3
N/A
Droop Test Load J5 / B receptacle
Inrush Current
J7/ A dongle
J10/ A receptacle
S5 switch between discharge/ off / on
1
LS = Low Speed, FS = Full Speed, HS = High Speed
2
See Table 3 for SMA connections
3
Connected to a load using a USB cable
Signal Connections
