參數(shù)資料
型號(hào)： TPS65950ZXNT
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PBGA209
封裝： 7 X 7 MM, 0.40 MM PITCH, PLASTIC, BGA-209
文件頁數(shù)： 12/167頁
文件大?。?/td> 2566K
代理商： TPS65950ZXNT
7.2.4.5 HS Differential Receiver
7.2.4.6 HS Differential Transmitter
TPS65950
Integrated Power Management/Audio Codec
www.ti.com
SWCS032 – OCTOBER 2008
The HS receiver consists of the following blocks:
A differential input comparator to receive the serial data
A squelch detector to qualify the received data
An oversampler-based clock data recovery scheme followed by a nonreturn to zero inverted (NRZI)
decoder, bit unstuffing, and a serial-to-parallel converter to generate the UTMI DATAOUT
Table 7-10 lists the parameters of the HS differential receiver.
Table 7-10. HS Differential Receiver
Parameter
Comments
Min(1)
Typ(2)
Max(3)
Unit
Input Levels for HS
HS squelch detection threshold
VHSSQ
(Differential signal amplitude)
100
125
150
mV
HS disconnect detection threshold
VHSDSC
(Differential signal amplitude)
525
600
625
mV
HS data signaling common mode voltage range
VHSCM
–50
200
500
mV
HS differential input sensitivity
VDIHS
(Differential signal amplitude)
–100
100
mV
Input Impedance for HS
Internal specification for input capacitance
CHSLOAD
11
pF
Internal CHSLOAD DP/DM matching
CHSLOADM
0.2
pF
External Components With the Total Budget Combined (Without USB Cable Load)
External capacitance on DP or DM
2
pF
External series resistance on DP or DM
1
(1)
Min = Minimum value
(2)
Typ = Typical value
(3)
Max = Maximum value
The HS transmitter is always operated on the UTMI parallel interface. The parallel data on the interface is
serialized, bit-stuffed, NRZI-encoded, and transmitted as a dc output current on DP or DM, depending on
the data. Each line has an effective 22.5-
load to ground, which generates the voltage levels for
signaling.
A disconnect detector is also part of the HS transmitter. A disconnect on the far end of the cable causes
the impedance seen by the transmitter to double, thereby doubling the differential amplitude seen on the
DP/DM lines.
Table 7-11 lists the parameters of the HS differential transmitter.
Table 7-11. HS Differential Transmitter
Parameter
Comments
Min(1)
Typ(2)
Max(3)
Unit
Output Levels for HS
HS TX idle level
VHSOI
Absolute voltage DP/DM – Both
–10
0
10
mV
internal/external 45
HS TX data signaling high
VHSOH
Absolute voltage DP/DM – Both
360
400
440
mV
internal/external 45
HS data signaling low
VHSOL
–10
0
10
mV
Chirp J level
VCHIRPJ
Differential voltage
700
800
1100
mV
Chirp K level
VCHIRPK
Differential voltage
–900
–800
–500
mV
HS TX disconnect threshold
VDISCOUT
Absolute voltage DP/DM—No external 45
700
mV
(1)
Min = Minimum value
(2)
Typ = Typical value
(3)
Max = Maximum value
USB HS 2.0 OTG Transceiver
109
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