ELECTRICAL CHARACTERISTICS OF LOW VOLTAGE ...

More documents

Recommendations

Info

TIA PN-4584 Revision 1.2 4.2.3 Terminating receiver input current - voltage measurements and input impedance measurements (Figure 12 and Figure 13) With the applied voltage (V in ) and forced current (I in ) listed in Table 1 applied to the corresponding inputs, the resultant differential input voltage magnitude (V id ) shall be between the values listed in Table 1. The test circuit is shown in Figure 12 and applies only to receivers that provide an internal termination impedance. These measurements apply with the receiver's power supply in both power-on and power-off conditions. NOTE - Some integrated circuit manufacturers may impose additional restrictions that may be required to meet this specification under the power-off condition. 225 mV ≤ | V id | ≤ 596 mV Table 1 - Receiver input current - voltage measurements for terminating receivers Applied Voltage V in (V) Forced Loop Current I in (mA) Switch Position S1 - S2 Resulting Input Voltage V r (V) Resulting Diff. Input Voltage Range V id (mV) 2.4 - 2.5 A' - B' 2.070 to 2.175 +225 to +330 2.4 - 4.5 A' - B' 1.806 to 1.995 +405 to +596 2.4 - 2.5 B' - A' 2.070 to 2.175 -225 to -330 2.4 - 4.5 B' - A' 1.806 to 1.995 -405 to -596 0 - 2.5 A' - B' 0.225 to 0.330 -225 to -330 0 - 4.5 A' - B' 0.405 to 0.594 -405 to -596 0 - 2.5 B' - A' 0.225 to 0.330 +225 to +330 0 - 4.5 B' - A' 0.405 to 0.594 +405 to +596 NOTE - Current into a terminal is positive, and current out of a terminal is negative. B' V id S1 A' A' ZT R V in V r I in S2 B' C' = Measured Parameter Figure 12 - Terminating receiver input current - voltage measurements 14 of 31
TIA PN-4584 Revision 1.2 4.5 IID - Loop Current - mA 4.0 3.5 90 Ω OPERATING REGION 132 Ω 3.0 2.5 2.0 0 100 200 300 400 500 600 | V ID | - Differential Input Voltage - mV Figure 13 - Terminating receiver input current vs. input voltage range The input impedance of the terminating receiver is dominated by the low impedance differential termination impedance (ZT). The resulting input resistance calculated from the measurements describe in Table 1 shall be greater than or equal to 90 Ω, and less than or equal to 132 Ω. See 4.2.5 on media termination, and 4.4.3 on total load limit. 90 Ω ≤ ZT ≤ 132 Ω NOTE - The internal termination impedance may be a simple resistor incorporated into the package, integrated on the die, or composed of active devices on the die. The exact structure and impedance of the termination is beyond the scope of this Standard. 15 of 31
Page 1: TIA PN-4584 Revision 1.2 ELECTRICAL
Page 4 and 5: TIA PN-4584 Revision 1.2 4.2 Load c
Page 6 and 7: TIA PN-4584 Revision 1.2 FOREWORD (
Page 8 and 9: TIA PN-4584 Revision 1.2 2 DEFINITI
Page 10 and 11: TIA PN-4584 Revision 1.2 3.2 Data s
Page 12 and 13: TIA PN-4584 Revision 1.2 4.1 Genera
Page 14 and 15: TIA PN-4584 Revision 1.2 4.1.2 Offs
Page 16 and 17: TIA PN-4584 Revision 1.2 4.1.4 Outp
Page 18 and 19: TIA PN-4584 Revision 1.2 4.2 Load c
Page 22 and 23: TIA PN-4584 Revision 1.2 4.2.4 Rece
Page 24 and 25: TIA PN-4584 Revision 1.2 NOTE - Due
Page 26 and 27: TIA PN-4584 Revision 1.2 4.4 System
Page 28 and 29: TIA PN-4584 Revision 1.2 5 ENVIRONM
Page 30 and 31: TIA PN-4584 Revision 1.2 Optional S
Page 32 and 33: TIA PN-4584 Revision 1.2 A.1.2 Typi
Page 34 and 35: TIA PN-4584 Revision 1.2 A.2 Cable
Page 36 and 37: TIA PN-4584 Revision 1.2 SWITCHING

ELECTRICAL CHARACTERISTICS OF LOW VOLTAGE ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?