Philips ISP1521 ユーザーズマニュアル
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 k
Ω
DPn
DMn
RPU
3.3 V
1.5 k
Ω ±
5
%
DUT
mdb274
C
L
(1)
15 k
Ω
test point
full-
speed
test point