PBL38640-2 Ericsson, PBL38640-2 Datasheet - Page 7

• Manufacturer Part Number: PBL38640-2
• Description: Subscriber Line Interface Circuit
• Manufacturer: Ericsson

Notes
1.
2.
3.
4.
Figure 7. Tipx voltage.
The overhead voltage can be adjusted with the R
resistor for higher levels e.g. min 3.1 V
at the two-wire port with the signal source at the four-wire
receive port.
The two-wire impedance is programmable by selection of
external component values according to:
Higher return loss values can be achieved by adding a
reactive component to R
impedance programming resistance, e.g. by dividing R
into two equal halves and connecting a capacitor from the
common point to ground.
The overhead voltage can be adjusted with the R
resistor for higher levels e.g. min 3.1 V
at the four-wire transmit port, VTX, with the signal source
at the two-wire port. Note that the gain from the two-wire
port to the four-wire transmit port is G
pin PTG)
Z
Z
Z
G
TRX
TRX
T
2-4S
RSN
= Z
= impedance between the TIPX and RINGX
= programming network between the VTX and RSN
= transmit gain, nominally = 1 (or 0.5 see pin PTG)
= receive current gain, nominally = 200 (current
terminals
terminals
defined as positive flowing into the receive summ-
ing node, RSN, and when flowing from ring to tip).
T
/|G
2-4S
RSN
| where:
T
, the two-wire terminating
2-4S
Peak
Peak
V
= 1 (or 0.5 see
and is specified
and is specified
BExt
OV
OV
R
R
LRTo
T
S
5.
6.
7.
8.
9.
10. If |V
TIPX
RINGX
Pin PTG = Open sets transmit gain to nom. 0.0dB
Pin PTG = AGND sets transmit gain to nom. -6.02 dB
Secondary protection resistors R
loss as explained in the text, section Transmission. The
specified insertion loss is for R
The specified insertion loss tolerance does not include
errors caused by external components.
The level is specified at the two-wire port.
The two-wire idle noise is specified with the port
terminated in 600
port grounded (E
The four-wire idle noise at VTX is specified with the two-
wire port terminated in 600
specification is referenced to a 600
wire impedance level at VTX. The four-wire receive port is
grounded (E
Previous state must be active - loop or ground key
detector.
the current I
PBL 386 40/2
BExt
|
|V
Bat
Leak
RX
+ 2 V|, where V
= 0).
is limited to
RX
= 0; see figure 6).
(R
L
) and with the four-wire receive
5mA.
(R
Bat
F
= 0.
L
F
). The noise
is the voltage at V
impact the insertion
PBL 386 40/2
programmed two-
BAT
pin,
7