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Philips Semiconductors
ISP1521
Hi-Speed USB hub controller
Product data Rev. 03 — 24 November 2004 47 of 53
9397 750 13702
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
18. Test information
(1) Transmitter: connected to 50 Ω inputs of a high-speed differential oscilloscope.
Receiver: connected to 50 Ω outputs of a high-speed differential data generator.
Fig 21. High-speed transmitter and receiver test circuit.
(1) C
L
= 50 pF for full-speed.
Fig 22. Full-speed test circuit.
mdb273
DMn
DPn
50 Ω coax
50 Ω coax
DUT
GND
V
CC
143 Ω
15.8 Ω
15.8 Ω
143 Ω
(1)
D−
D+
C
L
(1)
(1)
15 kΩ
DPn
DMn
RPU
3.3 V
1.5 kΩ ± 5%
DUT
mdb274
C
L
(1)
15 kΩ
test point
full-
speed
test point