E-STLC3075 STMicroelectronics, E-STLC3075 Datasheet - Page 21

• Manufacturer Part Number: E-STLC3075
• Manufacturer: STMicroelectronics

Specifications of E-STLC3075

• Number Of Channels: 1
• On-hook Transmission: Yes
• Polarity Reversal: Yes
• On-chip Ring Relay Driver: Yes
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Pin Count: 44
• Mounting: Surface Mount
• Operating Current: 55mA
• Operating Supply Voltage (max): 12V
• Lead Free Status / RoHS Status: Compliant

STLC3075
Table 15.
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).
CCOMP
RTTX
CTTX
Name
ZA
ZB
formula: ZTTX=50*(Zlttx+2Rp).
ZAC
CFL
RLV
RS
CH
CS
(1)
(1)
(2)
(2)
Protection resistance image
Two wire AC impedance
SLIC impedance balancing
network
Line impedance balancing
network
AC feedback loop
compensation
Trans-hybrid Loss frequency
compensation
Pulse metering cancellation
resistor
Pulse metering cancellation
capacitor
Pulse metering level resistor
Pulse metering shaping
capacitor
Pulse metering filter capacitor CFL = 2/(2π⋅fttx⋅RLV)
External components @gain set = 0
Function
RS = 50 ⋅ (2Rp)
ZAC = 50 ⋅ (Zs - 2Rp)
ZA = 50 ⋅ Zs
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)
Formula
3·
·α·V
LOTTX
@fttx = 12 kHz RLV = 16.2 kΩ
@ τ = 3.2 ms, RLV = 16.2 kΩ
25 kΩ 1% @ Zs = 600 Ω
@ V
Application information
@ Zlttx = 200 Ω real
@ Zlttx = 200 Ω real
100 nF 10% 10 V
5 kΩ @ Rp = 50 Ω
120 pF 10 % 10 V
120 pF 10 % 10 V
100 nF 10 % 10 V
1.5 nF 10 % 10 V
LOTTX
@ Zs = 600 Ω
@ Zl = 600 Ω
@ Rp = 50 Ω
Typ. value
30 kΩ 1 %
30 kΩ 1 %
16.2 kΩ
15 kΩ
= 170 mVrms
(3)
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