參數(shù)資料
型號： L9217A
英文描述： CAP CER 2700PF 3.15KVDC R3 RAD
中文描述： 低成本線接口，具有反向電池和PPM
文件頁數(shù)： 15/30頁
文件大?。?/td> 414K
代理商： L9217A
Agere Systems Inc.
15
Data Sheet
November 2001
with Reverse Battery and PPM
L9217A/G Low-Cost Line Interface
Applications
A basic loop start reference circuit, using bused ringing with the L9217 SLIC and the T7504 first-generation codec,
is shown in Figure 11. This circuit is designed for a 900
termination impedance and an 850
+
50 nF transhy-
brid. Transmit gain is set at 0 dBm and receive gain is set at –7 dBm.
*
Placeholder for potential resistor to form filter against PPM generator noise if necessary.
Figure 11. Basic Loop Start Application Circuit Using T7504-Type Codec
Table 10 shows the design parameters of the application circuit shown in Figure 11. Components that are adjusted
to program these values are also shown.
Table 10. 900
Termination, 850
+
50 nF Hybrid First-Generation Codec Design Parameters
Design Parameter
Parameter Value
10 mA
20 mA
900
850
+
50 nF
0 dBm
–7 dBm
Components Adjusted
R
LCTH
R
PROG
R
T1
, R
GP
, R
RCV,
R
GP1
C
HB
, R
HB
, R
HB1
R
T2
, R
X,
R
N1,
R
N2,
C
N
R
RCV
, R
GP
, R
T1
Loop Closure Threshold
dc Loop Current Limit
ac Termination Impedance
Hybrid Balance Line Impedance
Transmit Gain
Receive Gain
2797 (F)
R
PROG
35.7 k
R
LCTH
22.1 k
R
PT
50
L7591
R
PR
PT
18
1
7
LCTH
8
DCOUT
50
PR
10
RTSP
20
R
TS1
402
RTSN
19
R
3.32 M
V
RING
V
BAT
CF2
11
CF1
12
C
F1
0.47
μ
F
AGND
16
BGND
17
I
PROG
V
BAT
9
C
BAT
0.1
μ
F
RCVP
RCVN
5
6
R
GP
R
T1
33.2 k
R
T2
45.3 k
R
63.4 k
R
97.6 k
R
X
86.6 k
GSX
VF
R
O
DX
DR
FSX
FSR
MCLK
1/4 T7504
CODEC
PCM
HIGHWAY
CONTROL
AND
CLOCK
–
+
L9217
SLIC
C
RTS1
0.015
F
R
TSP
2.94 M
C
F2
0.1
μ
F
V
BAT
+2.4 V
C
B2
0.47
μ
F
22
SUPERVISION
OUTPUT
B1
B0
14
15
CONTROL
INPUTS
NSTAT
B2
13
VITR
23
TXI
24
VTX
25
TG
26
C
B
0.1
μ
F
R
8.06 k
TIP
RING
EMR
LCAS
C
B1
0.47
μ
F
R
HB
86.6 k
C
0.47 nF
14.7 k
C
0.01
μ
F
21
PPMIN
R
6.19 k
R
9.76 k
PPMIN
PPMOUT
28
V
CC
4
C
CC
0.1
μ
F
V
CC
R
OVH
49.9 k
27
OVH (for 2.5 Vrms PPM)
C
4.7 nF
OPEN
R
FLT
*
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