STMICROELECTRONICS STLC30R80

STLC30R80
®
INTEGRATED RINGING SLIC
FOR SHORT LOOP APPLICATIONS
MONOCHIP SLIC SUITABLE FOR SHORT
LOOP APPLICATIONS
IMPLEMENTES ALL KEY FEATURES OF
THE BORSHT FUNCTION
INTEGRATED RINGING
SOFT BATTERY REVERSAL WITH PROGRAMMABLE TRANSITION TIME
ON HOOK TRANSMISSION
LOW POWER DISSIPATION IN ALL OPERATING MODES
AUTOMATIC DUAL BATTERY OPERATION
INTEGRATED RING TRIP DETECTION
METERING PULSE INJECTION
LOOP START, GROUND START FEATURES
SURFACE MOUNT PACKAGE
-40 TO +85°C OPERATING RANGE
TQFP44 (10 x 10)
ORDERING NUMBER: STLC30R80
generation of the ringing signal and the standard
battery feeding with full programmability of the DC
characteristic.
In particular two external resistors allow to set the
limiting current value (up to 50mA) and the value
of the resistive feeding when not in constant current region.
DESCRIPTION
The STLC30R80 is a SLIC device suitable for
short loop applications. The SLIC provides the
BLOCK DIAGRAM
D2
D1
CRT RT1 RT2
D0
LINE STATUS
DET
GDK/AL
LOGIC
INTERFACE
&
DECODER
CSIN
CSOUT
RES
ILT
SUPERVISION
TIP
LINE
INTERFACE
ILL
RING
COMMANDS
SW
AC+
DC
AC
BGND
+
VREG
DC
ILTF
TTXIN
ZB
REFERENCE
&
BIAS SWITCHING
AC
PROCESSOR
TX
RX
ZAC1
November 2001
ZAC
RS
CAC
IREF
VCC
VDD
RLIM
DC
PROCESSOR
AGND CREV CSVR VBAT BASE
RTH
RDC
D99TL431AMOD
1/13
STLC30R80
BASE
CSVR
VREG
BGND
RING
TIP
AGND
AGND
AGND
DET
GDK/AL
PIN CONNECTION
44 43 42 41 40 39 38 37 36 35 34
CSOUT
1
33
CREV
CSIN
2
32
IREF
D0
3
31
RLIM
D1
4
30
RTH
D2
5
29
AGND
N.C.
6
28
RT1
N.C.
7
27
RT2
RES
8
26
ILTF
VDD
9
25
RDC
VCC
10
24
CAC
CRT
11
23
TTXIN
RX
ZAC1
ZAC
RS
ZB
TX
VBAT
SW.
AGND
N.C.
N.C.
12 13 14 15 16 17 18 19 20 21 22
PINCON_STLC30R80
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
-80 + VCC to +0.4
-80 + VREL to + 0.4
V
V
V
VBAT
Battery voltage
VCC
Positive supply voltage
-0.4 to +7
VDD
Control Interface Supply Voltage
-0.4 to +7
V
-2 to +2
V
A/R/BGND
AGND respect BGND
OPERATING RANGE
Symbol
Parameter
Value
Unit
-40 to +85
°C
4.75 to 5.25
V
Control Interface Supply Voltage
3 to 5.25
V
Battery voltage
-72 to -15
V
-0.3 to +0.3
V
TopT
Operating temperature range
VCC
Positive supply voltage
VDD
VBAT
A/BGND
AGND respect BGND
PD (70)
Max. power dissipation @ Tamb = 70°C
1.1
W
PD(85)
Max. power dissipation @ Tamb = 85°C
0.9
W
THERMAL DATA
Symbol
Rth j-amb
2/13
Parameter
Thermal resistance Junction to Ambient
Typ.
Value
Unit
60
°C/W
STLC30R80
PIN DESCRIPTION
Pins
1
Name
CSOUT
Description
Chip-Select for output control bits DET and GDK . Active Low. (*)
2
CSIN
3
D0
Control Interface input bit 0. (*)
4
D1
Control Interface input bit 1. (*)
Chip-Select for input control bits latches D0 D1 D2 R0 R1 . Active Low. (*)
5
D2
6
N.C.
Not connected
Control Interface input bit 2. (*)
7
N.C.
Not connected
8
RES
Reset Input; active low. After activation the SLIC is put in Power Down state
9
VDD
Control interface Power Supply. VDD = 3.3V or VDD = VCC.
10
VCC
Positive Power Supply (+5V).
11
CRT
Ring-Trip time constant capacitor.
12
N.C.
Not connected
13
N.C.
Not connected
14
SW
Internal switch/limiting current programming pin.
15
AGND
16
VBAT
17
TX
Analog Ground
Negative Battery Supply.
4 wires output stage (Transmitting Port).
18
ZB
Cancelling input of Balance Network for 2 to 4 wires conversion.
19
RS
Protection resistors image. The image resistor is connected between this node and ZAC.
20
ZAC
AC impedance synthesis.
21
ZAC1
RX buffer output/ AC impedance is connected between this node and ZAC.
22
RX
4 wires input stage (Receiving Port). A 100K external resistor must be connected to AGND to
bias the input stage.
23
TTXIN
Metering Signal Input (AC) and Line Voltage Drop Programming (DC). If not used must be connectd
to AGND.
24
CAC
25
RDC
DC current feedback input. The RDC resistor is connected between this node and ILTF.
26
ILTF
Transversal Line Current Image.
27
RT2
Input pin to sense ringing current , for Ring-Trip detection.
28
RT1
Input pin to sense ringing current , for Ring-Trip detection.
29
AGND
AC feedback input/ AC-DC split capacitor is connected between this node and ILTF.
Analog ground.
30
RTH
Off-Hook threshold programming pin.
31
RLIM
Limiting current programming pin.
32
IREF
Voltage reference output to generate internal reference current.
33
CREV
Reverse polarity transition time programming.
34
CSVR
Battery supply filter capacitor.
35
BASE
Driver of the external transistor. Connected to the base.
36
VREG
Regulated voltage. Provides the negative supply to the power line drivers. It is connected to the
emitter of the external transistor.
37
BGND
Battery ground.
38
RING
B wire termination output. IB is the current sunk into this pin.
39
TIP
40
AGND
A wire termination output. IA is the current sourced from this pin.
Analog ground.
3/13
STLC30R80
CONTROL INTERFACE
INPUTS
OUTPUTS
D0
D1
D2
0
0
0
0
1
1
1
0
0
1
1
0
1
1
0
1
0
1
0/1
1
0
OPERATING MODE
DET
(Active Low)
disable
off/hk
off/hk
off/hk
ring/trip
off/hk
off/hk
Power down
Stand-by
Active N.P.
Active R.P.
Ringing
High Impedance Feeding
Ground Start
A parallel interface allow to control the operation
of STLC30R80 through a control bus:
- D0 D1 D2 latched input bits defining the Slic
operation mode
- DET and GDK/AL , tri-state outputs, signal the
status of the loop: On/Off-Hook and Ground-Key.
Pin GDK/AL goes low also when the device
thermal protection is activated or a line fault (Tip to
Ring, Tip and/or Ring to Ground or VBAT) is
detected (flowing current ≥ 7.5mA).
-CSIN: chip select for input bits, active Low,
strobes the data present on the control bus into
the internal latch.
- CSOUT: chip select for output bits ; active Low ,
when high DET and GDK/AL goes tri-state.
D0 D1 D2 CSIN and CSOUT inputs are provided
with a 15µA pull-down current to prevent uncontrolled conditions in case the control bus goes
floating.
According to the table 6 operating modes can be
set:
1) Power-Down.
2) Stand-By.
3) Active N.P.
4) Active R.P.
5) Ringing
6) High Impedance Feeding.
Power-Down
It’s an idle state characterised by a very low
power consumption; any functionality is disabled.
It can be set during out of service periods just to
reduce the power consumption.
It is worth noticing that two other conditions can
set the Slic in idle state but with some differences
as reported in the table:
Idle State
Power Down
DET
Disable
GDK/AL
Disable
Reset
Thermal Alarm
Disable
Low
Disable
Low
Stand-By.
Mode selected in On-Hook condition when high
immunity to common mode currents is needed for
the DET bit.
To reduce the current consumption, AC feedback
loop is disabled and only DET and GDK/AL detectors are active.
DC current is limited at 16mA (not programmable); feeding characteristic shown in fig. a.
The voltage drop in on-hook condition is 7.8V.
Figure a: STLC30R80 DC Characteristic in
Stand-By Mode.
I
16mA
RFEED = 2RP
VBAT -7.8V
D98TL307
V
Active
Mode selected to allow voice signal transmission.
When in ACTIVE mode the voltage drop in onhook condition is 7.8V in order to allow proper onhook transmission (Fig. b).
Resistive Region is programmable by means of
external resistor RDC, limiting current can be selected by RLIM and Rswitch resistor.
Figure b. STLC30R80 DC Characteristic in
Active Mode.
I
ILIM [20÷50mA]
RFEED =
RDC
5
RFEED = 2RP
D99TL435
4/13
GDK/AL
(Active Low)
disable
gnd-key
gnd-key
gnd-key
disable
disable
gnd-key
VBAT -7.8V
+2RP
VBAT
V
STLC30R80
Concerning AC characteristic the STLC30R80 allows to set 2W termination impedance by means of
one external scaled impedance that may be complex. Two to four wire conversion is provided by an
external network. Such network can be avoided in
case of application with COMBOII, in this case the
two to four wire conversion is implemented inside
the COMBOII by means of the programmable Hybal filter.
When in ACTIVE mode it is also possible to perform battery reversal in soft mode (with programmable transition time) without affecting the AC signal transmission.
Ringing
When ringing mode is selected, by toggling the
D2 pin is possible to insert the ringing signal on
the line: the ringing frequency is equal to the one
applied to the D2 pin. The ringing signal is a balanced trapezoidal wave form where the TIP and
RING voltages switch continuously between GND
and VREG: VREG is obtained directly from VB1
(VREG = VB1 - 1.8V). The slope of the trapezoidal wave form is set by the external Crev capacitor and it allows to obtain ringing signal with distortion less than 10%: with a fine tuning of this
capacitor is possible to obtain distortion value
less than 5% (crest factor from 1.25 to 1.35).
Figure c. Typical ringing wave form.
GND
TIP
3V typ.
60V
typ.
dV/dT set
by CREV
RING
VREG
3V typ.
The VB1 value must be higher enough (~70V) in
order to obtain ringing signals with more than
40Vrms. The VB2 battery is used only when the
line is in off hook and its value can be reduced
(typ. 24V) in order to minimize the power consumption.
The ring trip detection is performed sensing the
variation of the AC line impedance from on-hook
(relatively high) to off-hook (relatively low). This
particularly ring trip method allows to operate
without DC off-set superimposed on the ringing
signal and therefore obtaining the maximum possible ring level on the load starting from a given
negative battery.
It should be noted that such a meted is optimized
for operation on short loop applications and may
not operate properly in presence of long loop
(>500 Ohm).
As the ring trip is detected the logic indicator DET
is set low and the ringing is automatically disconnected without waiting for the card controller command (auto ring trip).
Ringing with high REN number
When ringing high number of REN, for example
5REN, or short loops, it could happen that the line
AC current, trigger the ring trip circuit producing
false ring trip.
If this happens, a proper SW resistor (Rswitch)
can be inserted between RLIM and the pin.
The effect of this resistor is to improve the AC
current capability in Ring mode avoiding false ring
trip in presence of high REN numbers (typ.
5REN) and short loop.
One side effect of Rswitch is to reduce ring trip
sensitivity in presence of long loops; therefore it is
recommended to adjust Rswitch properly checking the correct behaviour of the device in the two
worst-case conditions:
- 0Ω loop, Max REN#
- Max loop length, 1 REN
The lower is the Rswitch value; the higher is the
immunity to false Ring trip, producing as side effect a lower Ring trip sensitivity on long loops.
The typical value of Rswitch is shown in the External Components Table (pag.7.13)
High Impedance Feeding.
As Stand-By, this mode is set in On-Hook condition, with further reduced power consumption.
Higher power efficiency turns back a lower immunity of the Off-Hook detector to line common
mode currents. The DC feeding shows a constant
current characteristic (Ilim = 17mA) followed by a
resistive range with an equivalent series resistance RFEED = 1600Ω + 2Rp.
Thermal protection circuit is still active, preventing
the junction temperature, in case of fault condition, to exceed 150°C
In High Impedance Feeding most of the circuit is
switched off, only the circuit, dedicated to OffHook detection, is powered. This allows to reduce
Figure d. STLC30R80 DC Characteristic in
High Impedance Feeding
I
17mA
D98TL373
RFEED = 1600Ω +2RP
VBAT -0.8V
V
5/13
STLC30R80
Figure 1. Logic Interface Input Timing
t1
t1
t2
t3
t4
t5
t6
Min.
100ns
100ns
500ns
100ns
100ns
500ns
t3
t2
CSIN
D0.1.2
CSOUT
DET, GDK
Note: All measurements are performed with 100pF on outputs
pin and with TTL compatible voltage levels.
t4
the total power consumption in On-hook to 30mW
(typical).
The Off-Hook detection threshold is not programmable but defined at a fixed IDETHI = 8mA(max.)
Ground Start.
This mode is selected when the SLIC is adopted
in a system using the Ground Start feature. In this
mode the TIP termination is set in High Impedance (100kΩ) while the RING one is active and
fixed at Vbat +4.8V. In the case of connection of
RING termination to GND the sinked current is
limited to 30mA. When RING is connected to
GND both Off-Hook and Ground-Key detectors
become active. Power dissipation in this mode
with a -48V battery voltage is 100mW.
PROTECTION CIRCUIT
Suggested protection circuit is based on programmable Trisils (like LCP1511/2) as shown in Fig.2
and Fig. 3, and the surge current is limited by the
resistors RPT2 and RPR2, which are PTC types ,
protecting the device against both lightning and
power-cross.
METERING PULSE INJECTION
STLC30R80 provides external pins and components for Metering Pulse injection. TTXIN pin is
the input for the 12kHz or 16kHz Metering Pulse
injection. This pin also provides a DC constant
current source that is injected into the external
RDA resistor (typ. 10kΩ) connected between
TTXIN pin and AGND. The voltage drop across
TIP and RING line amplifiers and, consequentally
the AC swing available.
When Metering Pulse injection is not used and
voltage drop is not required, TTXIN must be
shorted to AGND and RTTX, RDA and CTTX external components must be removed. The TTX
cancellation is obtained through an external
RTTX and CTTX network connected between
6/13
t6
t5
Figure1_STLC30R80
TTXIN and CAC pins.
MISCELLANEOUS
- Thermal overload: the integrated thermal protection is activated when Tj reaches 150°C typ.;
the Slic is forced in Power-down mode, DET
and AL are set Low.
- One low cost external transistor allows to reduce the power dissipated in the SLIC itself allowing the use of extreme small size package
(TQFP44). The external transistor size/package
can be selected depending on the max. power
requested by the particular application.
EXTERNAL COMPONENTS LIST
To set the SLIC into operation the following parameters have to be defined:
- The DC feeding resistance "Rfeed" defined as
the resistance of the traditional feeding system (most common Rfeed values are: 400,
800, 1000 ohm).
- The AC SLIC impedance at line terminals "Zs"
to which the return loss measurements is referred. It can be real (typ. 600 ohm) or complex.
- The equivalent AC impedance of the line "Zl"
used for evaluation of the trans-hybrid loss performance (2/4wire conversion). It is usually a
complex impedance.
- The value of the two protection resistors Rp in
series with the line termination.
- The reverse polarity transition time defined as
"∆VTR/∆T".
- The constant current limit value "Ilim".
- Rth: sets the OFF/Hook DETection threshold
Once, the above parameters are defined, it is
possible to calculate all the external components
using the following table.
STLC30R80
EXTERNAL COMPONENTS
Name
RREF (*)
CSVR
CRT
RDC
CAC
Function
Formula
Internal current reference programming
1.16
IREF =
resistor
RREF
Battery ripple rejection capacitance
1
CSVR =
2π ⋅ fp ⋅ 1.3MΩ
Ring Trip capacitance
CRT = (25/fring) ⋅ 470nF
DC sinthesized resistance
programming resistor
AC/DC splitter capacitance
RS
ZAC
ZA
ZB
CCOMP
Protection resistor image
2 wire AC impedance
SLIC impedance balancing network
Line impedance balancing network
AC feedback compensation
capacitance
RS1
RS2
QEXT
RPT1
RPR1
RLIM (*)
Sensing resistor for Ring Trip
Sensing resistor for Ring Trip
External transistor
Line series resistor
Line series resistor
Current limiting setting resistor
RSWITCH (***)
Current limiting setting resistor
RDC = 5[Rfeed -2Rp]
RDC ≥ 1kΩ
2
2π ⋅ fo[100 ⋅ Rp]
1000 ⋅ RR
1000 ⋅ RR
(1)
≥20Ω
≥20Ω
CCOMP =
OFF/HOOK DETection threshold
setting resistor.
CREV
Polarity reversal transition time
programming
CREV =
RDA
Output Voltage Drop Adjustment
RDA =
RTTX
CTTX
Teletax Cancellation Resistor
Teletax Cancellation Capacitor
RPT2
RPR2
D1
D2
CH
CVCC
CVB
Protection resistor
Protection resistor
Overvoltage protection
Dual Battery Operation
Trans-Hybrid Loss Frequency
Compensation
Power Supply Filter
Battery Supply Filter
100nF ±10% 100V
@ fp = 1.22Hz
470nF ±20% 6V
@ 25Hz
1.5kΩ ±1%
10µF ±20% 15V
@ fsp = 10Hz
1
2π ⋅ fsp ⋅ RDC
RS = 25 ⋅ 2Rp
ZAC = 25[Zs - 2Rp]
ZA = 25 ⋅ Zs
ZB = 25 ⋅ Zl
CAC =
1.16
; 26kΩ ÷ 64.9kΩ
ILIM
24.4kΩ ⋅ RLIM [kΩ]
Rswitch [kΩ] =
RLIM [kΩ] − 24.4kΩ
1.16
RTH = 200 ⋅
; 23.7kΩ ÷ 86.6kΩ
RTH (**)
Typical Value
30.1kΩ ± 1%
RLIM = 103 ⋅
2.5kΩ ±1%
12.5kΩ ±1%
15kΩ ±1%
15kΩ ±1%
220pF ±20%
@ fo = 250kHz
600kΩ ±0.5%
600kΩ ±0.5%
BD140, MJD32
20W 1/4W
20Ω 1/4W ±1%
51.1kΩ ±1%
47kΩ
26.1kΩ
±1%
ITH
K
1
; K=
3750
∆VTR
∆T
∆Drop ⋅ 20kΩ
9.6 − ∆Drop
RTTX = 12.5 ⋅ [Re (ZLTTX) + 2RP]
CTTX =
47nF for 5.67V/ms
10kΩ (∆Drop = 3.2V) (2)
3.75kΩ
1
(12.5 ⋅ Im (ZLTTX) ⋅ 2π ⋅ fTTX)
≥ 8Ω
≥ 8Ω
CH = CCOMP
1N4448
1N4448
220pF ±30%
100nF ±20%
100nF ±20% 100V
Notes:
(1) Transistor characteristics: hFE ≥ 25, IC ≥ 100mA, VCEO ≥ 60V, fT ≥ 15MHz. PDISS depends on application, see Appendix.
For SMD application possible alternatives are MJD350 in D-PACK or BCP53 in SOT223
(2) Typical value needed for 2.2Vrms metering pulse level, if no metering RDA = 0Ω.
(*) RREF and RLIM should be connected close to the corresponding pins of STLC30R80.
Avoid any digital line or high voltage swing line to pass close to IREF and RLIM pins. Eventually screen these pins with a GND track.
(**) Inside the formula the coefficient 1.16 must be changed to 1.2 if the selected value of I Th is lower than 5mA.
(***) This resistor must be used only in presence of REN number and short loop see description at page 5/13.
7/13
STLC30R80
Figure 2. Typical application diagram.
ZAC1
ZAC
RS
VCC
VDD
VCC
VDD
To RSWITCH Resistor
AGND
BGND
SW
TIP
RS
ZA
CCOMP
RX
RX
TX
TX
RPR1
RING
RING
RPR2
RS1(*)
ZB
CONTROL
INTERFACE
LCP
1511
VB1
ZB
CH
RPT2
RPT1
TIP
ZAC
RT1
D0
D0
D1
D1
D2
D2
DET
STLC30R80
BASE
RT2
DET
GDK/AL
CSIN
QEXT
RS2(*)
D2
D1
GDK/AL
VBAT
CSIN
CSOUT
VB1
VB2
CSOUT
RES
RES
TTX
TTXIN
(1)
VREG
RDA
CSVR
CREV
ILTF RDC
CAC
RTTX
CRT
RDC
CTTX
IREF
RLIM
RTH
REF
CRT
RTH
CREV
CAC
CSVR
From SWITCH PIN
(*) 1% match, 600KΩ typ.
(1) Components needed only for Metering pulse injection.
(2) to be inserted only for 5REN application
RSWITCH
(2)
RLIM
D99TL433CMod
Figure 3. Test Circuit.
CVCC
ZAC1
ZAC
12.5KΩ
RS 2.5KΩ
VCC
VDD
VCC
VDD
To RSWITCH Resistor
AGND
BGND
CCOMP
220pF
TIP
TIP
ZAC
RX
RX
TX
TX
LCP
1511
VB-
RS
ZA
15KΩ
RPT2 30Ω
RPT1 20Ω
SW
RPR1 20Ω
RPR2 30Ω
RING
RING
ZB
CH
220pF
RT1
ZB
15KΩ
CONTROL
INTERFACE
D0
D0
D1
D1
D2
D2
DET
GDK/AL
CSIN
CSOUT
RES
TTX
RS1(*) 600KΩ
STLC30R80
(*) 1% match, 600KΩ typ.
RS2(*) 600KΩ
DET
GDK/AL
VBAT
CSIN
VB1
CVB
VB2
CSOUT
RES
CSVR
CREV
TTXIN
RTTX
3.75K
CTTX
1µF
ILTF RDC
CAC
RDC
1.5KΩ
CRT
RREF
CRT
470nF
RLIM
RREF
30.1KΩ
RTH
RTH
26.1KΩ
10µF
CREV
47nF
CSVR
100nF
From SWITCH PIN
RLIM
51.1KΩ
8/13
QEXT
BD140
D1
1N4448
BASE
RT2
CAC
RDA
10K
VREG
RSWITCH
D99TL434CMod
STLC30R80
ELECTRICAL CHARACTERISTICS (Test Condition, unless otherwise specified: VCC = 5V, VDD = 3.3V,
VB- = -48V, AGND = BGND, Tamb = 25°C).
Note: the limits below listed are guaranteed with the specified test condition and in the 0 to 70°C temperature range. Performance over -40 to +85°C range are guaranteed by product characterisation.
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
40
Ω
Fig.
AC CHARACTERISTICS
Zil
Long. Impedance
Iil
Long. Current Capability AC
L/T
Long. to transv.
each wire
H.I. feeding per wire (ON-HOOK)
5
mApk
STANDBY or ACTIVE per
wire (ON-HOOK)
13
mApk
ACTIVE per wire (OFFHOOK). IT = Transversal
Current
80 -IT
mApk
with nominal Rp value
60
dB
C5
T/L
Transv. to long.
40
dB
C3
2wRL
2W return loss.
300 to 3400Hz
22
dB
C6
THL
trans-hybrid loss.
1020Hz; 20Log |VRX/VTX|
30
dB
C2
Ovl
2W overload level
ACTIVE MODE at line
terminals on ref. imped.
3.2
dBm
TXoff
TX output offset
-200
200
mV
G24
Transmit gain abs.
0dBm 1020Hz
-12.38
-12.02
dB
C4
G42
Receive gain abs.
0dBm 1020Hz
5.74
6.1
dB
C1
G24fq
tx gain variation vs.
frequency
rel. 1020Hz, 0dBm 300 to
3400Hz
-0.1
0.1
dB
G42fq
rx gain variation vs.
frequency
rel. 1020Hz, 0dBm 300 to
3400Hz
-0.1
0.1
dB
V2wp
idle channel noise at line
terminals
psophometric
-82
-78
dBmp
C8
V4wp
idle channel noise at TX port
psophometric
-90
-84
dBmp
C7
Thd
total harm. dist. 2w-4w, 4w2w
0dBm, 1KHz Il = 20 to
45mA
-50
dB
GTTX
Transfer Gain
VTTX = 100mVRMS @ 16kHz
14.5
dB
 VL 
GTTX = 20Log 

 VTTX 
with RL = 200Ω
THD (TTX)
TTX Harmonic Distortion
2.2VRMS = on 200Ω
3
%
DC CHARACTERISTICS (TTX pin connected to ground)
Vlohi
Line voltage
Il = 0, H.I. feeding
47
47.4
47.8
V
Vlo
Line voltage
Il = 0, SBY/ACTIVE/ONHOOK
38.6
39.9
40.6
V
Ilims
Short circ. curr.
Rloop = 0, SBY
14
16
18
mA
Ilimb
Short circ. curr.
Rloop = 0, H.I. feeding
11
17
20
mA
Ilima
Lim. current accuracy
Rel to progr. val. 20 to 45mA
ACTIVE NP, RP
-10
10
%
Rfeed
Feed res. accuracy
ACTIVE NP, RP
-10
10
%
Rfeed H.I.
Feeding resistance
H.I. feeding
1100
2100
Ω
9/13
STLC30R80
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Test Condition
Min.
Ilact
Feed current ACTIVE
Parameter
ACTIVE NP, RP
Rloop = 1900Ω RDC = 1.5kΩ
18
Typ.
Max.
mA
Ilsby
Feed current STBY
STY, Rloop = 2.2KΩ
RDC = 1.5kΩ
13
mA
ITIP
Tip Leackage Current
Ground Start
IGS
Ring Lead Current
Ground Sart Ring to GND
IDA
Reference current sourced
by TTX IN pin for Voltage
Drop programming
1
Unit
Fig.
µA
33
mA
-60
µA
DETECTORS
Idet
Idet H.I.
Off-hook current threshold
ST-BY, ACTIVE
Rel. to progr. val. 7 to 11mA
-10
+10
%
Rel. to progr. val. 3 to 6mA
-20
+20
%
Off-Hook current threshold
H.I. feeding
Hys
Off/On hook hyst.
ST-BY, ACTIVE
5
Td
Dialling distortion
ACTIVE
ILL
Ground Key Current
threshold
ILL = IB - IA
TIP to RING to GND or
RING to GND
Igst
Ground Start Detection
Threshold
Igst = 2 ⋅ Idet
-10
2
8
15% Idet
-1
mA
mA
+1
7.5
ms
mA
+10
%
DIGITAL INTERFACE
INPUTS: D0, D1, D2, CSIN, CSOUT
Vih
Input high voltage
VDD = 3.3V
Vil
Input low voltage
VDD = 3.3V
Iih
Iil
V
0.8
V
Input high current
30
µA
Input low current
10
µA
0.5
V
OUTPUTS: DET, GDK /AL
Vol
Output low voltage
Iol = 0.75mA; CSOUT = LOW
Voh
Output high voltage
Ioh = 0.1mA; CSOUT = LOW
2.4
Tri-State Output Current
CSOUT = High
-10
IOZ
V
+10
µA
POWER SUPPLY REJECTION
PSRRC
VCC to 2W port
Vripple = 0.1Vrms
50 to 4000Hz
27
dB
C9
PSRRB
Vbat to 2W port
Vripple = 0.1Vrms
50 to 4000Hz
30
dB
C9
POWER CONSUMPTION
ICC
VCC supply current
H. I. Feeding On-Hook
SBY On Hook
ACTIVE On Hook
1.0
3.5
5.0
mA
mA
mA
IBAT
VBAT supply current
H. I. Feeding On-Hook
SBY On Hook
ACTIVE On Hook
0.5
2.5
4.5
mA
mA
mA
IDD
VDD Supply Current
Any operating mode
320
µA
10/13
100
STLC30R80
APPENDIX A
Battery voltage autoset
The STLC30R80 shows a line voltage depending on the voltage applied to Vbat pin. In particular in the
On-Hook the line voltage is Vbat if the SLIC is put in HI-Z mode or Vbat -7.8V if the SLIC is put in Active
mode.
If the battery voltage applied to the Vbat pin is always -70V (necessary to generate the proper ringing
signal), during the On-Hook the line voltage is higher than 60V.
A simple circuit to generate the proper Off-Hook battery voltage can be used starting from the -70V as
shown in the below figure A1.
The RING command (active low) is used to switch on the NPN transistor and apply the battery voltage
directly to the Vbat pin. When the RING command is high the NPN transistor is off and the zener diode
reduces the voltage applied to the Vbat pin.
Figure A1.
VCC
470KΩ
BC556
RING
STLC30R80
47KΩ
VBAT
68KΩ
BC558
24V
470KΩ
D00TL461
BATTERY VOLTAGE (-70V)
11/13
STLC30R80
mm
DIM.
MIN.
TYP.
A
inch
MAX.
MIN.
TYP.
1.60
A1
0.05
A2
1.35
B
0.30
C
0.09
0.063
0.15
0.002
0.006
1.40
1.45
0.053
0.055
0.057
0.37
0.45
0.012
0.014
0.018
0.20
0.004
0.008
D
12.00
0.472
D1
10.00
0.394
D3
8.00
0.315
e
0.80
0.031
E
12.00
0.472
E1
10.00
0.394
E3
8.00
0.315
L
0.45
0.60
0.75
OUTLINE AND
MECHANICAL DATA
MAX.
0.018
0.024
L1
1.00
K
0°(min.), 3.5˚(typ.), 7°(max.)
0.030
0.039
TQFP44 (10 x 10)
D
D1
A
A2
A1
33
23
34
22
0.10mm
.004
B
E
B
E1
Seating Plane
12
44
11
1
C
L
e
K
TQFP4410
12/13
STLC30R80
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13/13