SBPH400-3 datasheet(6/43 Pages) STMICROELECTRONICS

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SBPH400-3

Functional Description

2.1

Transmitter and receiver port interface

Figure 2.1

Analog port schematic

The SBPH400-3 implements three cable interface transceiver ports. Each port operates

independently from the other ports, under control of the device control logic. Each port

provides two pairs of signals, denoted TPA, TPA#, and TPB, TPB#. Each signal is

implemented using a driver and a receiver connected to a single pin (total of four pins per port).

In various modes, the driver and receiver are enabled, either separately or both at the same

time (for bi-directional signalling).

Ω

Strb_ Tx

Strb_ Ena ble

Da ta_Rx

Ω

Twisted Pair A

Twisted Pair B

TPA

TPA*

TPB

TPB *

TpB ia s ’

0. 3

µf

min

Driv e r

Rec eiv er

Arb_A_Rx

A rbitr ation

C o m para tors

S 200_ref

S20 0

Da ta _T x

Da ta _Enab le

Strb_Rx

A rbitration

C om p arator s

Arb _ B_Rx

Bia s

0.8V

C o m m on mode sp ee d

sig na l cu rren t

Ω

±5%

250pF

(sh ared with TPA

and other ports)

Ω

T pB ias de te c tion c ompa rato r

ICD

Ph ys ic al connec tion

de te ction c o m pa rato r

Con

Tp Bias disa ble

S4 00 _r ef

S40 0

Spe e d_T x

S4 00

Sp ee d_T x

S20 0

Speed_Rx

Spe ed_ Rx

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