stlc3075 STMicroelectronics, stlc3075 Datasheet - Page 18

• Manufacturer Part Number: stlc3075
• Description: Integrated Pots Interface For Home Access Gateway And Wll
• Manufacturer: STMicroelectronics

Functional description
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=100Hz).
18/36
CCOMP
CTTX
RTTX
Name
ZA
ZB
formula: ZTTX=50*(Zlttx+2Rp).
ZAC
RLV
CFL
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/(2
External components @gain set = 0
Function
RS = 50
ZAC = 50
ZA = 50
ZB = 50
fo = 250kHz
CCOMP = 1/(2
CH = CCOMP
RTTX = 50Re (Zlttx+2Rp)
CTTX = 1/{50
lm(Zlttx)]}
RLV = 63.3·10
CS = /(2 RLV)
= (|Zlttx + 2Rp|/|Zlttx|)
Zs
Zl
(2Rp)
(Zs - 2Rp)
Formula
fttx RLV)
3·
· ·V
2
fo 100 (RP))
LOTTX
fttx [-
@fttx = 12kHz RLV = 16.2k
@
@ V
25k 1% @ Zs = 600
@ Zlttx = 200 real
@ Zlttx = 200 real
100nF 10% 10V
= 3.2ms, RLV = 16.2k
5k @ Rp = 50
120pF 10% 10V
120pF 10% 10V
100nF 10% 10V
1.5nF 10% 10V
LOTTX
@ Zs = 600
@ Zl = 600
@ Rp = 50
Typ. value
30k 1%
30k 1%
16.2k
15k
= 170mVrms
STLC3075
(3)