STLC3055N_09 STMICROELECTRONICS [STMicroelectronics], STLC3055N_09 Datasheet - Page 19

• Manufacturer Part Number: STLC3055N_09
• Description: WLL and ISDN-TA subscriber line interface circuit
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

STLC3055N
Table 11.
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
3. In this case CTTX is just operating as a DC decoupling capacitor (fp=100 Hz).
Table 12.
CCOMP AC feedback loop compensation
CCOMP AC feedback loop compensation
RTTX
CTTX
RTTX
CTTX
Name
Name
ZB
ZA
ZB
CFL
ZAC
RLV
formula:
ZTTX=50*(Zlttx+2Rp).
RLV
CH
CH
CS
RS
(1)
(1)
(1)
(2)
(2)
(2)
(2)
Pulse metering filter capacitor
Protection resistance image
Two wire AC impedance
SLIC impedance balancing
network
Line impedance balancing
network
Trans-Hybrid Loss frequency
compensation
Pulse metering cancellation
resistor
Pulse metering cancellation
capacitor
Pulse metering level resistor
Line impedance balancing
network
Trans-Hybrid Loss frequency
compensation
Pulse metering cancellation
resistor
Pulse metering cancellation
capacitor
Pulse metering level resistor
Pulse metering shaping
capacitor
External components @gain set = 0 (continued)
External components @gain set = 1
Function
Function
ZB = 50 ⋅ Zl
fo = 250 kHz
CCOMP = 1/(2π⋅fo⋅100⋅(RP))
CH = CCOMP
RTTX = 50Re (Zlttx+2Rp)
CTTX = 1/{50⋅2π⋅fttx[-
lm(Zlttx)]}
RLV = 63.3·10
α = (|Zlttx + 2Rp|/|Zlttx|)
CS = τ/(2⋅RLV)
CFL = 2/(2π⋅fttx⋅RLV)
RS = 25 ⋅ (2Rp)
ZAC = 25 ⋅ (Zs - 2Rp)
ZA = 25 ⋅ Zs
ZB = 25 ⋅ Zl
fo = 250kHz
CCOMP = 2/(2π⋅fo⋅100⋅(RP))
CH = CCOMP
RTTX = 25Re (Zlttx+2Rp)
CTTX = 1/25⋅2π⋅fttx⋅[-lm(Zlttx)]
RLV = 31.7·10
α = (|Zlttx + 2Rp|/|Zlttx|)
Formula
Formula
3·
3·
·α·V
·α·V
LOTTX
LOTTX
16.2 kΩ @ V
16.2 kΩ @ V
220 pF 10% 10VL @ Rp = 50 Ω
120 pF 10% 10 V @ Rp = 50 Ω
@fttx = 12 kHz RLV = 16.2 kΩ
@ τ = 3.2 ms, RLV = 16.2 kΩ
7.5 kΩ @Zlttx = 200 Ω real
15 kΩ @Zlttx = 200 Ω real
12.5 kΩ 1% @ Zs = 600 Ω
15 kΩ 1% @ Zs = 600 Ω
30 kΩ 1% @ Zl = 600 Ω
15 kΩ 1% @ ZI = 600 Ω
2.55 kΩ @ Rp = 50 Ω
@ Zlttx = 200 Ω real
@ Zlttx = 200Ω real
100 nF 10% 10 V
Application information
100nF 10% 10V
120 pF 10% 10 V
100 nF 10% 10V
1.5 nF 10% 10 V
220 pF 10% 10 V
Typ. value
Typ. value
LOTTX
LOTTX
= 170mVrms
= 340 mVrms
(3)
(3)
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