IC INTERFACE CIRCUIT 44 TQFP

 

STLC3055Q

Manufacturer Part NumberSTLC3055Q
DescriptionIC INTERFACE CIRCUIT 44 TQFP
ManufacturerSTMicroelectronics
STLC3055Q datasheets

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Specifications of STLC3055Q

Applications*Interface*
Voltage - Supply*Package / Case44-LQFP
Mounting TypeSurface MountLead Free Status / RoHS StatusContains lead / RoHS non-compliant
Other names497-2145  
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STLC3055N
5.2
External components list
In order to properly define the external components value the following system parameters
have to be defined:
●
The AC input impedance shown by the SLIC at the line terminals "Zs" to which the
return loss measurement is referred. It can be real (typ. 600 Ω) or complex.
●
The AC balance impedance, it is the equivalent impedance of the line "Zl" used for
evaluation of the trans-hybrid loss performances (2/4 wire conversion). It is usually a
complex impedance.
●
The value of the two protection resistors Rp in series with the line termination. The line
impedance at the TTX frequency "Zlttx".
●
The metering pulse level amplitude measured at line termination "VLOTTX". In case of
low order filtering, VLOTTX represents the amplitude (Vrms) of the fundamental
frequency component. (typ 12 or 16 kHz).
●
Pulse metering envelope rise and decay time constant "τ".
●
The slope of the ringing waveform "ΔV
●
The value of the constant current limit current "Ilim".
●
The value of the off-hook current threshold "I
●
The value of the ring trip rectified average threshold current "I
●
The value of the required self generated negative battery "V
value is 70 V). This value can be obtained from the desired ring peak level +5 V.
●
The value of the maximum current peak sunk from Vpos "IPK".
Table 10.
External components
Name
Function
RRX
Rx input bias resistor
RREF
Bias setting current
CSVR
Negative battery filter
Ring Trip threshold setting
RD
resistor
CAC
AC/DC split capacitance
RP
Line protection resistor
RLIM
Current limiting programming
Off-hook threshold programming
RTH
(ACTIVE mode)
Reverse polarity transition time
CREV
programming
RDD
Pull up resistors
CVCC
Internally supply filter capacitor
/ΔT ".
TR
".
TH
Formula
RREF = 1.3/Ibias
Ibias = 50 μA
CSVR = 1/(2π ⋅ fp ⋅ 1.8 MΩ)
fp = 50 Hz
RD = 100/I
RTH
2 kΩ < RD < 5 kΩ
Rp > 30 Ω
RLIM = 1300/Ilim
32.5kΩ < RLIM < 65kΩ
RTH = 290/I
TH
27 kΩ < RTH < 52 kΩ
CREV = ((1/3750) · ΔT/ΔV
)
TR
Application information
".
RTH
" in ring mode (max
BATR
Typ. value
100 kΩ 5%
26 kΩ 1%
1.5 nF 10%
100 V
4.12 kΩ 1%
@ IRTH = 24 mA
22 μF 20% 15 V
@ RD = 4.12 kΩ
50 Ω 1%
52.3 kΩ 1%
@ Ilim = 25 mA
32.4 kΩ 1%
@I
= 9 mA
TH
22 nF 10% 10 V
@ 12 V/ms
100 kΩ
100 nF 20% 10 V
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