E-STLC3075 Просмотр технического описания (PDF) - STMicroelectronics

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E-STLC3075

Integrated POTS interface for home access gateway and WLL

STMicroelectronics 

STLC3075

Application information

Table 15. External components @gain set = 0

Name

Function

Formula

Typ. value

RS Protection resistance image RS = 50 ⋅ (2Rp)

ZAC Two wire AC impedance

ZAC = 50 ⋅ (Zs - 2Rp)

ZA(1)

SLIC impedance balancing

network

ZA = 50 ⋅ Zs

ZB(1)

Line impedance balancing

network

ZB = 50 ⋅ Zl

CCOMP

AC feedback loop

compensation

fo = 250 kHz

CCOMP = 1/(2π⋅fo⋅100⋅(RP))

CH

Trans-hybrid Loss frequency

compensation

CH = CCOMP

RTTX(2)

Pulse metering cancellation

resistor

RTTX = 50Re (Zlttx+2Rp)

CTTX(2)

RLV

Pulse metering cancellation

capacitor

Pulse metering level resistor

CTTX = 1/{50 ⋅ 2π⋅ fttx [-lm(Zlttx)]}

RLV = 63.3·103··α·VLOTTX

α = (|Zlttx + 2Rp|/|Zlttx|)

CS

Pulse metering shaping

capacitor

CS = τ/(2⋅RLV)

CFL Pulse metering filter capacitor CFL = 2/(2π⋅fttx⋅RLV)

5 kΩ @ Rp = 50 Ω

25 kΩ 1% @ Zs = 600 Ω

30 kΩ 1 %

@ Zs = 600 Ω

30 kΩ 1 %

@ Zl = 600 Ω

120 pF 10 % 10 V

@ Rp = 50 Ω

120 pF 10 % 10 V

15 kΩ

@ Zlttx = 200 Ω real

100 nF 10% 10 V(3)

@ Zlttx = 200 Ω real

16.2 kΩ

@ VLOTTX = 170 mVrms

100 nF 10 % 10 V

@ τ = 3.2 ms, RLV = 16.2 kΩ

1.5 nF 10 % 10 V

@fttx = 12 kHz RLV = 16.2 kΩ

1. In case Zs=Zl, ZA and ZB can be replaced by two resistors of same value: RA=RB=|Zs|.

2. Defining ZTTX as the impedance of RTTX in series with CTTX, RTTX and CTTX can also be calculated from the following

formula: ZTTX=50*(Zlttx+2Rp).

3. In this case CTTX is just operating as a DC decoupling capacitor (fp=100 Hz).

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