LE9502BTC Zarlink, LE9502BTC Datasheet - Page 8

• Manufacturer Part Number: LE9502BTC
• Description: SLIC 2-CH 63dB 3.3V 44-Pin TQFP Tray
• Manufacturer: Zarlink

Specifications of LE9502BTC

• Package: 44TQFP
• Number Of Channels Per Chip: 2
• Polarity Reversal: Yes
• Longitudinal Balanced: 63 dB
• Minimum Operating Supply Voltage: 3.13 V
• Typical Operating Supply Voltage: 3.3 V
• Typical Supply Current: 7.5 mA

Signal Transmission
In Normal Active and Reverse Polarity states, the AC line current is sensed across the R
attenuated, and converted to voltage at the CFILT
external C
component of the line voltage. Additionally, the signal transmission block receives the analog signal from the codec device. The
analog signal is amplified and sent to the line. Finally, a proportion of the signal at V
There are three parameters which define the AC characteristics of the Le9502 RSLIC device. First is the input impedance
presented to the line or 2-wire (V
is the gain from the 2-wire (V
Input Impedance (Z
Z
where 2 • R
loss purpose, K
Table. Note that the equation reveals that Z
and R
specifications. However, in a real application, R
600 Ω input impedance.
2-Wire to 4-Wire Gain (G
The 2-wire to 4-wire gain is the gain from the phone line to the VOUT output of the Le9502 RSLIC device. To solve for G
V
4-Wire to 2-Wire Gain (G
G
R
where K
2WIN
IN
L
42
in place of the test voltage source V
= V
is the gain from the VIN input to the line. This gain is defined as V
IMT
is the impedance presented to the line at the 2-wire side and is defined by:
INP
IN
is 100 k, the terminating impedance is 600 Ω. This is the configuration used in this data sheet for defining the device
HPi
is the gain from VIN to V
− V
F
capacitor, is amplified, and sent to the codec device at the VOUT
is the total resistance of the external fuse resistors in the circuit, R
INM
OUT
or
or
= 0 V (see
is the gain from V
2WIN
)
AB
24
42
Figure
) side to the 4-wire (V
)
)
AB
) side (Z
AB
7).
.
OUT
T
(see
G
42
2WIN
to V
2WIN
=
G
Figure
F
), second is the gain from the 4-wire (V
AB
–
24
V
--------- -
V
20
= 50 Ω is recommended, and RIMT is set to 80.6 KΩ to provide an approximate
is a function of the selectable resistors, R
V
------------- -
AB
, and K
IN
i
Z
=
V
log
pin. The voltage then goes through a high pass filter implemented using the
OUT
2WIN
AB
Zarlink Semiconductor Inc.
–
OUT
7).
=
20






-------------------------------------------------- -


G
=
1
log
K
) side (G
=
42
V
+
G
IN


2R
K
---------------------------------- -
is the voice current gain defined in the Transmission Specifications
24
=
K


OUT
----------------------- -
R
R
OUT
-------------------------------------------------- -


F
=
L
L
1
8
+
K
+
R
+
R
+
-----------------------------------------
------------------- -
K
K
IN
+
L
24
2R
2R
IMT
V
K
---------------------------------- -
2R
V


R
------------------- -
K
OUT
).
K
----------------------- -
R
R
F
V
F
2R
IMT
K
OUT
F


L
L
R
AB
V
R
+
+
1
IMT
R


F
+
/V






L
2R
2R
R
IMT
K
 in dB

IN
IMT
in dB
OUT
F
F
K
. For the analysis of G


V


i
pin. This output is proportional to the AC metallic
IMT
OUT
is the impedance setting resistor for return
IN
) to the 2-wire (V
S
is fed back to the line.
resistors (see
IMT
and R
42
, substitute the load resistor
F
. For example, if R
AB
Figure
) side (G
7), summed and
42
), and third
F
24
= 0 Ω
, set