Datasheet STLC30R80 Datasheet (SGS Thomson Microelectronics)

®

FOR SHORT LOOP APPLICATIONS

MONOCHIP SLIC SUITABLE FOR SHORT
LOOP APPL I CATIONS

IMPLEMENTES ALL KEY FEATURES OF
THE BORSHT FUNCTION

INTEGRATED RINGIN G
SOFT BATTERY REVERSAL WITH PRO-

GRAMMABLE TRANSITION TIME
ON HOOK TRANSMISSION
LOW POWER DISSIPATION IN ALL OPER-

ATING 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

DESCRIPTION

The STLC30R80 is a SLIC device suitable for
short loop applications. The SLIC provides the

STLC30R80

INTEGRATED RINGING SLIC

TQFP44 (10 x 10)

ORDERING NUMBER:

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.

STLC30R80

BLOCK DIAGRAM

DET

GDK/AL

CSIN

CSOUT

RES

SW

TTXIN

ZB
TX

RX

ZAC1

D0D1D2

LOGIC

INTERFACE

&

DECODER

AC

PROCESSOR

RSZAC

RT1 RT2CRT

LINE STATUS

ILT

SUPERVISION

COMMANDS

REFERENCE

&

BIAS SWITCHING

IREF V

CAC AGND CREV CSVR

CC

V

DD

ILL

AC+

DC
AC

DC

LINE

INTERFACE

+

DC

PROCESSOR

VBAT BASE RDC

TIP

RING

BGND
VREG
ILTF

RLIM
RTH

D99TL431AMOD

November 2001

1/13

STLC30R80

PIN CONNECTION

CSOUT

CSIN

D0
D1

D2
N.C.
N.C.
RES

VDD
VCC
CRT

BGND

RING

TIP

AGND

AGND

AGND

DET

GDK/AL

44 43 42 41 3940 38 37 36 35 34

1
2
3
4
5
6
7
8
9

10

12 13 14 15 16

SW.

N.C.

N.C.

171118 19 20 21 22

TX

ZB

VBAT

AGND

RS

VREG

ZAC

BASE

CSVR

33
32
31
30
29
28
27
26
25
24
23

RX

PINCON_STLC30R80

ZAC1

CREV
IREF
RLIM
RTH
AGND
RT1
RT2
ILTF
RDC
CAC
TTXIN

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

BAT

V

CC

V

DD

Battery voltage -80 + VCC to +0.4

-80 + V

REL

to + 0.4

Positive supply voltage -0.4 to +7 V
Control Interface Supply Voltage -0.4 to +7 V

A/R/BGND AGND respect BGND -2 to +2 V

OPERATING RANGE

Symbol Parameter Value Unit

T

opT

V

CC

V

DD

V

BAT

Operating temperature range -40 to +85 °C
Positive supply voltage 4.75 to 5.25 V
Control Interface Supply Voltage 3 to 5.25 V
Battery voltage -72 to -15 V

A/BGND AGND respect BGND -0.3 to +0.3 V

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 Parameter Value Unit

R

th j-amb

Thermal resistance Junction to Ambient Typ. 60 °C/W

V
V

2/13

STLC30R80

PIN DESCRIPTION

Pins Name Description

1
2
3 D0 Control Interface input bit 0. (*)
4 D1 Control Interface input bit 1. (*)
5 D2 Control Interface input bit 2. (*)
6 N.C. Not connected
7 N.C. Not connected
8

9V
10 V
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 Analog Ground
16 V
17 TX 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

23 TTXIN Metering Signal Input (AC) and Line Voltage Drop Programming (DC). If not used must be connectd

24 CAC AC feedback input/ AC-DC split capacitor is connected between this node and ILTF.
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 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

37 BGND Battery ground.
38 RING B wire termination output. IB is the current sunk into this pin.
39 TIP A wire termination output. IA is the current sourced from this pin.
40 AGND Analog ground.

CSOUT Chip-Select for output control bits DET and GDK . Active Low. (*)

CSIN Chip-Select for input control bits latches D0 D1 D2 R0 R1 . Active Low. (*)

RES Reset Input; active low. After activation the SLIC is put in Power Down state

DD
CC

BAT

Control interface Power Supply. VDD = 3.3V or VDD = VCC.
Positive Power Supply (+5V).

Negative Battery Supply.

bias the input stage.

to AGND.

emitter of the external transistor.

3/13

STLC30R80

CONTROL INTERFACE

INPUTS

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

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.

GDK/AL goes low also when the device

Pin
thermal protection is activated or a line fault (Tip to
Ring, Tip and/or Ring to Ground or VBAT) is
detec ted (flowing c urren t ≥ 7.5mA).

CSIN: chip select for input bits, active Low,

­ strobes the data present on the control bus into
the internal latch.

CSOUT: c h i p s el ect for o u tpu t b it s ; a c tive L ow ,

­ 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 DET GDK/AL

Power Down Disable Disable

Reset Disable Disable

Thermal Alarm Low Low

OUTPUTS

DET

(Active Low)

disable

off/hk
off/hk
off/hk

ring/trip

off/hk
off/hk

GDK/AL

(Active Low)

disable
gnd-key
gnd-key
gnd-key

disable

disable
gnd-key

Stand-By.

Mode selected in On-Hook condition when high
immunity to common mode currents is needed for

DET bit.

the
To reduce the current consumption, AC feedback

loop is disabled and only

DET and GDK/AL de-

tectors are a ct ive .
DC current is limited at 16mA (no t programma-

ble); 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

R

= 2R

D98TL307

FEED

V

BAT

P

-7.8V

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 R
lected by R

LIM

and R

, limiting current can be se-

DC

resistor.

switch

Figure b. STLC30R80 DC Characteristic in

Active M o de.

I

I

[20÷50mA]

LIM

D99TL435

R

FEED

R

= 2R

FEED

P

V

BAT

=

R

-7.8V

DC

+2R

P

5

V

BAT

V

V

4/13

STLC30R80

Concerning AC characteristic the STLC30R80 al­lows to s et 2W termination impedanc e by means of
one exter nal scaled impedance t hat may be com­plex. Two to four wire conversion is provided by an
externa l network. Suc h network can be avoid ed 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 filte r.
When in ACTIVE mode it is also possible to per­form battery reversal in soft mode (with program­mable tra nsition time) witho ut affectin g the AC sig­nal tran smi ss ion .

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 s ignal 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.

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 dev ice 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 s hown in the Ex­ternal Components Table (pag.7.13)

GND

VREG

TIP

RING

3V typ.

dV/dT set
by CREV

3V typ.

60V
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 star ting from a given
negative battery.

It should be noted t hat such a meted is optimized
for operation on short loop applications and may
not operate properly in presence of long loop
(>500 Ohm).

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 c onstant
current characteristic (I

= 17mA) followed by a

lim

resistive range with an equivalent series resis­tance R

= 1600Ω + 2Rp.

FEED

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

R

FEED

= 1600Ω +2R

V

BAT

P

-0.8V

V

5/13

STLC30R80

Figure 1. Log ic Interface Input Timing

Min.
t1
t2
t3
t4
t5
t6

Note:

All measurements are performed with 100pF on outputs

pin and with TTL compatible voltage levels.

100ns
100ns
500ns
100ns
100ns
500ns

CSIN

D0.1.2

CSOUT

DET, GDK

t6t4 t5

t3t1 t2

Figure1_STLC30R80

the total power consumption in On-hook to 30mW
(typical).
The Off-Hook detection threshold is not progr am­mable but defined at a fixed I

DETHI = 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

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 COMPONEN TS 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

/∆T".

"∆V

TR

- The constant current limit value "I

- Rth: sets the OFF/Hook

DETection threshold

lim

".

Once, the above parameters are defined, it is
possible to calculate all the external components
using the following table.

6/13

EXTERNAL COMPONENTS

Name Function Formula Typical Value

(*) Internal current reference programming

R

REF

resistor

C

SVR

C

RT

R

DC

Battery ripple rejection capacitance

Ring Trip capacitance CRT = (25/fring) ⋅ 470nF 470nF ±20% 6V

DC sinthesized resistance
programming resistor

C

AC

R

S

AC/DC splitter capacitance

Protection resistor image RS = 25 ⋅ 2Rp 2.5kΩ ±1%

ZAC 2 wire AC impedance Z

1.16

I

=

REF

R

REF

C

=

SVR

RDC = 5[R
R

≥ 1kΩ

DC

C

=

AC

= 25[Zs - 2Rp] 12.5kΩ ±1%

AC

1

2π ⋅ fp ⋅ 1.3MΩ

-2Rp]

feed

1

2π ⋅ fsp ⋅ R

DC

ZA SLIC impedance balancing network ZA = 25 ⋅ Zs 15kΩ ±1%
ZB Line impedance balancing network ZB = 25 ⋅ Zl 15kΩ ±1%

C

COMP

AC feedback compensation
capacitance

C

COMP

=

2π ⋅ fo

2

[100

⋅ Rp]

RS1 Sensing resistor for Ring Trip 1000 ⋅ RR 600kΩ ±0.5%
RS2 Sensing resistor for Ring Trip 1000 ⋅ RR 600kΩ ±0.5%

Q

EXT

External transistor (1) BD140, MJD32

RPT1 Line series resistor ≥20Ω 20W 1/4W

RPR1 Line series resistor ≥20Ω 20Ω 1/4W ±1%

R

(*) Current limiting setting resistor

LIM

R

(***)

SWITCH

R

(**) OFF/HOOK DETection threshold

TH

Current limiting setting resistor

setting resistor.

C

REV

Polarity reversal transition time
programming

R

R

R

C

LIM

switch

TH

REV

= 200 ⋅

= 103 ⋅

[kΩ] =

K

=

∆V

1.16
; 26kΩ ÷ 64.9kΩ

I

LIM

Ω ⋅

24.4k

R

[kΩ] − 24.4kΩ

LIM

1.16
; 23.7kΩ ÷ 86.6kΩ

I

TH

1

K =

;

TR

3750

R

LIM

[kΩ]

∆T

RDA Output Voltage Drop Adjustment

R

TTX

C

TTX

Teletax Cancellation Resistor R
Teletax Cancellation Capacitor

∆Drop ⋅ 20k

RDA =

C

9.6

= 12.5 ⋅ [Re (ZL

TTX

=

TTX

12.5 ⋅ Im (ZL

(

− ∆Drop

Ω

) + 2RP]3.75kΩ

TTX

1

) ⋅ 2π ⋅

TTX

30.1kΩ ± 1%

100nF ±10% 100V
@ fp = 1.22Hz

@ 25Hz

1.5kΩ ±1%

10µF ±20% 15V
@ fsp = 10Hz

220pF ±20%
@ fo = 250kHz

51.1kΩ ±1%

47kΩ

26.1kΩ ±1%

47nF for 5.67V/ms

10kΩ (∆Drop = 3.2V) (2)

)

f

TTX

STLC30R80

RPT2 Protection resistor ≥ 8Ω

RPR2 Protection resistor ≥ 8Ω

D1 Overvoltage protection 1N4448
D2 Dual Battery Operation 1N4448
CH Trans-Hybrid Loss Frequency

CH = CCOMP 220pF ±30%

Compensation

C

VCC

C

VB

Notes:

(1) Transistor characteristics: h

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.
(*) R

REF

Avoid any digital line or high voltage swing line to pass close to I
(**) Inside the formula the coefficient 1.16 must be changed to 1.2 if the selected value of I
(***) This resistor must be used only in presence of REN number and short loop see description at page 5/13.

Power Supply Filter 100nF ±20%
Battery Supply Filter 100nF ±20% 100V

≥ 25, IC ≥ 100mA, V

FE

and RLIM should be connected close to the corresponding pins of STLC30R80.

≥ 60V, fT ≥ 15MHz. PDISS depends on application, see Appendix.

CEO

and R

REF

pins. Eventually screen these pins with a GND track.

LIM

is lower than 5mA.

Th

7/13

STLC30R80

Figure 2. Typical application diagram.

V

V

CC

DD

To RSWITCH Resistor

D0
D1
D2

RDA RTTX

(1)

RX RX

TX

ZAZBCCOMP

CH

CONTROL

INTERFACE

GDK/AL GDK/AL

RES RES

(*) 1% match, 600KΩ typ.
(1) Components needed only for Metering pulse injection.
(2) to be inserted only for 5REN application

Figure 3. Test Circuit.

V

CAC

CAC

CC

RDC

ILTF

V

CC

CV

CC

ZAC1

RSZAC

ZAC
RS

TX
ZB

D0
D1
D2
DETDET

CSINCSIN
CSOUTCSOUT

TTXINTTX

CTTX

AGND BGND

V

DD

STLC30R80

CRT

RDC

CRT

V

DD

IREF

REF

RLIM

RLIM

SW

RTH

RSWITCH

(2)

TIP

RING

RT1

VREG

BASE

RS2(*)

RT2

VBAT

CSVR
CREV

RTH

From SWITCH PIN

To RSWITCH Resistor

RS1(*)

CREV

RPT1

VB1

RPR1

RPT2

LCP

1511

RPR2

D1

VB1

VB2

CSVR

TIP

RING

QEXT

D2

D99TL433CMod

220pF

8/13

CH

ZAC

12.5KΩ

ZA

CCOMP

15KΩ

220pF

ZB

15KΩ

CONTROL

INTERFACE

(*) 1% match, 600KΩ typ.

ZAC1

RTTX

3.75K

CTTX

1µF

ZAC
RS
RX
TX
ZB

D0
D1
D2
DETDET

CSINCSIN
CSOUTCSOUT

TTXIN

CAC

RS 2.5KΩ

RX
TX

D0
D1
D2

GDK/AL GDK/AL

RES RES

TTX

RDA

10K

CAC

10µF

ILTF

V

RDC

CC

1.5KΩ

V

DD

STLC30R80

CRT

RDC

AGND BGND

RREF

CRT

RREF

470nF

30.1KΩ

RLIM

51.1KΩ

RLIM

SW

RTH

RSWITCH

TIP

RING

RT1

VREG

BASE

RT2

VBAT

CSVR
CREV

RTH

26.1KΩ

RPT1 20Ω

VB-

RPR1 20Ω

RS1(*) 600KΩ

RS2(*) 600KΩ

CVB

CREV

47nF

From SWITCH PIN

LCP

1511

VB1 VB2

CSVR
100nF

RPT2 30Ω

RPR2 30Ω

QEXT

BD140

D1

1N4448

TIP

RING

D99TL434CMod

STLC30R80

ELECTRICAL CHARACTERISTICS

= -48V, AGND = BGND, T

V

B-

= 25°C).

amb

(Test Condition, unless otherwise specified: V

= 5V, VDD = 3.3V,

CC

Note: the limits below listed are guaranteed with the s pecified 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 Fig.

AC CHARACTERISTICS

Zil Long. Impedance each wire 40 Ω

I

il

L/T Long. to transv. 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

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.

G42fq rx gain variation vs.

V2wp idle channel noise at line

V4wp idle channel noise at TX port psophometric -90 -84 dBmp C7

Thd total harm. dist. 2w-4w, 4w-2w0dBm, 1KHz Il = 20 to

G

TTX

THD (TTX) TTX Harmonic Distortion 2.2V

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/ON-

Ilims Short circ. curr. R
Ilimb Short circ. curr. R
Ilima Lim. current accuracy Rel to progr. val. 20 to 45mA

Rfeed Feed res. accuracy ACTIVE NP, RP -10 10 %

Rfeed H.I. Feeding resistance H.I. feeding 1100 2100 Ω

Long. Current Capability AC H.I. feeding per wire (ON-HOOK) 5 mApk

STANDBY or ACTIVE per

13 mApk

wire (ON-HOOK)
ACTIVE per wire (OFF-

HOOK). I

= Transversal

T

80 -I

T

mApk

Current

3.2 dBm

terminals on ref. imped.

frequency

frequency

rel. 1020Hz, 0dBm 300 to
3400Hz

rel. 1020Hz, 0dBm 300 to
3400Hz

-0.1 0.1 dB

-0.1 0.1 dB

psophometric -82 -78 dBmp C8

terminals

-50 dB

45mA

Transfer Gain V

TTX

G

TTX

with R

= 100mV

= 20Log

= 200Ω

L

= on 200Ω 3%

RMS

@ 16kHz

RMS

V



L



V

TTX







14.5 dB

38.6 39.9 40.6 V

HOOK

= 0, SBY 14 16 18 mA

loop

= 0, H.I. feeding 11 17 20 mA

loop

-10 10 %

ACTIVE NP, RP

9/13

STLC30R80

ELECTRICAL CHARACTERISTICS

(continued)

Symbol Parameter Test Condition Min. Typ. Max. Unit Fig.

Ilact Feed current ACTIVE ACTIVE NP, RP

18 mA

Rloop = 1900Ω RDC = 1.5kΩ

Ilsby Feed current STBY STY, Rloop = 2.2KΩ

13 mA

RDC = 1.5kΩ

I

TIP

I

GS

I

DA

Tip Leackage Current Ground Start 1 µA
Ring Lead Current Ground Sart Ring to GND 33 mA
Reference current sourced

-60 µA
by TTX IN pin for Voltage
Drop programming

DETECTORS

I

det

Off-hook current threshold
ST-BY, ACTIVE

I

H.I. Off-Hook current threshold H.I. feeding 5 8 mA

det

Hys Off/On hook hyst. ST-BY, ACTIVE 15% I

Rel. to progr. val. 7 to 11mA -10 +10 %
Rel. to progr. val. 3 to 6mA -20 +20 %

det

mA

Td Dialling distortion ACTIVE -1 +1 ms

I

LL

I

gst

Ground Key Current
threshold
I

= IB - I

LL

A

Ground Start Detection

TIP to RING to GND or
RING to GND

I

= 2 ⋅ I

gst

det

7.5 mA

-10 +10 %

Threshold

DIGITAL INTERFACE

INPUTS: D0, D1, D2,

Vih Input high voltage V

Vil Input low voltage V

CSIN, CSOUT

= 3.3V 2 V

DD

= 3.3V 0.8 V

DD

Iih Input high current 30 µA

Iil Input low current 10 µA

OUTPUTS:

Vol Output low voltage Iol = 0.75mA;

Voh Output high voltage I oh = 0 .1 m A;

I

OZ

DET, GDK /AL

CSOUT = LOW 0.5 V

CSOUT = LOW 2.4 V

Tri-State Output Current CSOUT = High -10 +10 µA

POWER SUPPLY REJECTION

PSRRC V

to 2W port Vripple = 0.1Vrms

CC

27 dB C9

50 to 4000Hz

PSRRB Vbat to 2W port Vripple = 0.1Vrms

30 dB C9

50 to 4000Hz

POWER CONSUMPTION

I

I

I

CC

BAT

DD

VCC supply current H. I. Feeding On-Hook

SBY On Hook
ACTIVE On Hook

V

supply current H. I. Feeding On-Hook

BAT

SBY On Hook
ACTIVE On Hook

1.0

3.5

5.0

0.5

2.5

4.5

mA
mA
mA

mA
mA
mA

VDD Supply Current Any operating mode 100 320 µA

10/13

STLC30R 8 0

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.

V

CC

470KΩ

RING

47KΩ

68KΩ

D00TL461

BC556

BC558

470KΩ

24V

STLC30R80

V

BAT

BATTERY VOLTAGE (-70V)

11/13

STLC30R80

DIM.

mm inch

MIN. TYP. MAX. MIN. TYP. MAX.

A 1.60 0.063
A1 0.05 0.15 0.002 0.006
A2 1.35 1.40 1.45 0.053 0.055 0.057

B 0.30 0.37 0.45 0.012 0.014 0.018

C 0.09 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 0.018 0.024 0.030
L1 1.00 0.039

K 0°(min.), 3.5˚(typ.), 7°(max.)

OUTLINE AND

MECHANICAL DATA

TQFP44 (10 x 10)

D

D1

A1

2333

34

B

44

1

e

11

TQFP4410

22

E

E1

12

L

0.10mm
.004

Seating Plane

B

K

A

A2

C

12/13

STLC30R80

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13/13