STLC3055N STMicroelectronics, STLC3055N Datasheet - Page 17

• Manufacturer Part Number: STLC3055N
• Manufacturer: STMicroelectronics

Specifications of STLC3055N

• Number Of Channels: 1
• On-hook Transmission: Yes
• Polarity Reversal: Yes
• On-chip Ring Relay Driver: No
• Longitudinal Balanced: 58
• Operating Supply Voltage (typ): 9V
• Operating Temp Range: -40C to 85C
• Package Type: TQFP
• Loop Current Limit: 40mA
• Operating Temperature Classification: Industrial
• Pin Count: 44
• Mounting: Surface Mount
• Operating Current: 55mA
• Operating Supply Voltage (max): 12V
• Operating Supply Voltage (min): 5.5V
• Lead Free Status / RoHS Status: Not Compliant

STLC3055N
5.2
Table 10.
CVCC
Name
RREF
CSVR
CREV
RLIM
RDD
RRX
CAC
RTH
RD
RP
Rx input bias resistor
Bias setting current
Negative battery filter
Ring Trip threshold setting
resistor
AC/DC split capacitance
Line protection resistor
Current limiting programming
Off-hook threshold programming
(ACTIVE mode)
Reverse polarity transition time
programming
Pull up resistors
Internally supply filter capacitor
External components list
In order to properly define the external components value the following system parameters
have to be defined:
●
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External components
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".
Function
RREF = 1.3/Ibias
Ibias = 50 μA
CSVR = 1/(2π ⋅ fp ⋅ 1.8 MΩ)
fp = 50 Hz
RD = 100/I
2 kΩ < RD < 5 kΩ
Rp > 30 Ω
RLIM = 1300/Ilim
32.5kΩ < RLIM < 65kΩ
RTH = 290/I
27 kΩ < RTH < 52 kΩ
CREV = ((1/3750) · ΔT/ΔV
RTH
Formula
TH
TR
/ΔT ".
TH
".
TR
)
BATR
Application information
RTH
100 nF 20% 10 V
@ IRTH = 24 mA
@ RD = 4.12 kΩ
22 μF 20% 15 V
22 nF 10% 10 V
@ Ilim = 25 mA
" in ring mode (max
@I
".
4.12 kΩ 1%
52.3 kΩ 1%
32.4 kΩ 1%
1.5 nF 10%
@ 12 V/ms
100 kΩ 5%
Typ. value
26 kΩ 1%
50 Ω 1%
TH
100 kΩ
100 V
= 9 mA
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