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STLC3055Q

WLL & ISDN-TA SUBSCRIBER LINE INTERFACE CIRCUIT

STMicroelectronics 

STLC3055

EXTERNAL COMPONENTS

Name

RREF

Function

Bias setting current

CSVR Negative Battery Filter

RD

CAC

Ring Trip threshold setting

resistor

AC/DC split capacitance

Formula

RREF = 1.3/Ibias

Ibias = 50µA

CSVR = 1/(2π ⋅ fp ⋅ 1.8MΩ)

fp = 50Hz

RD = 100/IRTH

2KΩ < RD < 5KΩ

RP

RS

ZAC

Line protection resistor

Protection and series switches

resistance image

Two wire AC impedance

Rp > 30Ω

RS = 100 ⋅ (Rp + 9Ω)

ZAC = 50 ⋅ (Zs - 2Rp - 18Ω)

ZA (1)

ZB (1)

CCOMP

CH

RLIM

RTH

CREV

RTTX (3)

CTTX (3)

RLV

CS

CFL

SLIC impedance balancing

network

Line impedance balancing

network

AC feedback loop compensation

Trans-Hybrid Loss frequency

compensation

Current limiting programming

Off-hook threshold programming

(ACTIVE mode)

Reverse polarity transition time

programming

Pulse metering cancellation

resistor

Pulse metering cancellation

capacitor

Pulse metering level resistor

Pulse metering shaping

capacitor

Pulse metering filter capacitor

ZA = 50 ⋅ Zs

ZB = 50 ⋅ Zl

CCOMP = 1/(2π⋅fo⋅100⋅(RP+9Ω))

fo = 250kHz

CH = CCOMP

RLIM = 1300/Ilim

32.5kΩ < RLIM < 65kΩ

RTH = 260/ITH

27kΩ < RTH < 52kΩ

CREV = (1/3750) ⋅ ∆T/∆VTR)

RTTX = 50Re[(Zlttx+2Rp+18Ω)]

CTTX = 1/{50⋅2π⋅fttx[-lm(Zlttx)]}

RLV = 63.3⋅103⋅α⋅VLOTTX

α = (|Zlttx + 2Rp + 18Ω|/|Zlttx|)

CS = τ/(2⋅RLV)

CFL = 2/(2π⋅fttx⋅RLV)

RDD

CVCC

CVpos

CV

CVB

Pull up resistors

Internally supply filter capacitor

Positive supply filter capacitor

with low impedance for switch

mode power supply

Battery supply filter capacitor

with low impedance for switch

mode power supply

High frequency noise filter

Typ. Value

26kΩ 1%

1.5nF 10%

100VL

4.12kΩ 1%

@ IRTH = 24mA

22µF 20% 15VL

@ RD = 4.12kΩ

41Ω 1%

5kΩ @ Rp = 41Ω

25kΩ 1%

@ Zs = 600Ω

30kΩ 1%

@ Zs = 600Ω

30kΩ 1%

@ Zl = 600Ω

120pF 10% 10VL

@ Rp = 41Ω

120pF 10% 10VL

52.3kΩ 1%

@ Ilim = 25mA

28.7kΩ 1%

@ITH = 9mA

22nF 10% 10V

@ 12V/ms

15kΩ

@Zlttx = 200Ω real

100nF 10% 10V (2)

@ Zlttx = 200Ω real

27kΩ 1%

@ VLOTTX = 275mVrms

100nF 10% 10V

@ τ = 6ms, RLV = 27.1kΩ

1nF 10% 10V

@fttx = 12kHz

RLV = 27kΩ

100kΩ

100nF 20% 10V

100µF(4)

100µF 20% 100V (5)

470nF 20% 100VL

10/22

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