stlc3040 STMicroelectronics, stlc3040 Datasheet - Page 2

• Manufacturer Part Number: stlc3040
• Description: Subscriber Line Interface Codec Filter, Cofislic
• Manufacturer: STMicroelectronics

STLC3040
DESCRIPTION (continued)
plane via a GCI compatible interface (see fig.2).
The GCI handles all STLC3040 control and voice
channel.
The STLC3040 processes the transversal line-
current sensed by the ST HV (L3000N, L3000S,
STLC3170) Line Driver Circuit and generates
voltage-drive to the line via the HV (L3000N,
L3000S, STLC3170), thus synthetizing the imped-
ances required by various world administrations .
Line impedances as well as the two-to-four wire
conversion synthesis are software programmable.
Also Transmit (Tx) and Receive(Rx) AC fre-
quency–response, determined by DSP-filters,
guarantee voice-band flat-response. Tx and Rx
Gains are programmable as well. Digitized voice
can be encoded on A-law or u-law.
The DC characteristic is obtained by selecting
limit-current value, DC-feed resistance (2 X 50
steps) and Drop-voltage. It also permits On-hook
transmission and TTX pulse injection with filtering
and shaping. TTX metering pulse generation (12
or 16kHz) has programmable amplitude up to 10
Vrms.
Off-hook detection with programmable thresholds
Figure 2: Functional Diagram.
STLC3040 PIN DESCRIPTION (This list is grouped according to Function)
2/49
POWER SUPPLY
27
33
34
N.
1
2
CAP
FSC
DCL
DU
DD
Symbol
DGND
AGND
VDD
VCC
VEE
RAC
Iline
INT.
GCI
Type (*)
PS
PS
PS
PS
PS
ACDC
CAC
STLC3040
ANALOG
RDC
FRONT
Digital Ground
+5V Digital Supply Voltage
Analog Ground
-5V Analog Supply Voltage
+5V Analog Supply Voltage
PROCESSOR
END
DIGITAL
LV
SIGNAL
REF
V
CC
CONTROL
HV
VOUT
IT
IL
PDO
C2
C1
is possible in all operating modes as described in
section 4.
Ring-signal with zero-crossing start/stop injection
is generated on chip with programmable fre-
quency and amplitude. In addition, when Ring-
trip is detected, the Ring-signal is automatically
disconnected at the next zero-crossing.
Power consumption is kept low by providing a
"Power-Down" mode where the HV-SLIC is
switched off (Power Denial). A set of internal re-
sistors connected to the line allows Off-hook de-
tection in this mode. Overall power dissipation is
around 50mW (max.) in Power Down mode.
Several testing features are included in the
STLC3040, both for self-test and to test line leak-
age, capacitance ..etc, thus saving on test equip-
ment and relays. Measured DC quantities are dig-
itized and sent via the B1 voice channel to the
backplane. With proper software selection each
signal can be modulated by a 1KHz carrier before
being sent to B1 voice channel. Programmable
linear code, software selectable, boosts the calcu-
lation resolution.
Sigma-Delta converters (ASD: Analog, DSD: Digi-
tal) make the conversion independent of technol-
ogy parameters (fig. 3).
CDVB
VBIM
Description
REF
VIN
C2
C1
IT
IL
L3000N
HV
CURRENT
SENSORS
A=-20
A=20
D95TL204B
TIP
RING
RP1
RP2
I
RING
I
TIP