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參數(shù)資料
| 型號： | PBL386302QNT |
| 廠商： | ERICSSON |
| 英文描述： | AC/DC CAPACITANCE=0.5 VOLT=2000 |
| 中文描述： | 用戶線接口電路 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 134K |
| 代理商： | PBL386302QNT |
PBL 386 30/2
7
Notes
1.
The overload level can be adjusted with the R
resistor
for higher levels e.g. min 3.1 V
and is specified 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:
Z
TRX
= Z
T
/|G
2-4S
α
RSN
| where:
Z
TRX
= impedance between the TIPX and RINGX
terminals
Z
T
= programming network between the VTX and RSN
terminals
G
2-4S
= transmit gain, nominally = 1 (or 0.5 see pin PTG)
α
RSN
= receive current gain, nominally = 200 (current
defined as positive flowing into the receivesumm-
ing node, RSN, and when flowing from ring to tip).
Higher return loss values can be achieved by adding a
reactive component to R
, the two-wire terminating
impedance programming resistance, e.g. by dividing R
into two equal halves and connecting a capacitor from the
common point to ground.
2.
3.
4.
The overload level level can be adjusted with the R
resistor for higher levels e.g. min 3.1 V
and is specified
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
2-4S
= 1 (or 0.5 see
pin PTG)
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
impact the insertion loss
as explained in the text, section Transmission. The
specified insertion loss is for R
= R
= 0.
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
(R
) and with the four-wire receive
port grounded (E
= 0; see figure 6).
The four-wire idle noise at VTX is specified with the two-
wire port terminated in 600
(R
). The noise specification
is referenced to a 600
programmed two-wire impedance
level at VTX. The four-wire receive port is grounded
(E
RX
= 0).
5.
6.
7.
8.
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