Preliminary Data Sheet
October 2001
Low-Cost Ringing SLIC
L9214A/G
Agere Systems Inc.
39
Applications
(continued)
Design Examples
(continued)
ac Interface Using First-Generation Codec
(continued)
Table 21. L9214 Parts List for Agere T7504 First-Generation Codec; Complex Termination with Power Con-
trol Resistor
(continued)
Note: T
X
= 0 dBm, R
X
= 0 dBm, termination impedance = 220
+ (820
|| 115 nF)
,
hybrid balance = 220
+ (820
|| 115 nF)
.
Name
Power Supply
C
VBAT1
C
VBAT2
D
BAT1
C
CC
C
F1
C
F2
R
PWR
dc Profile
R
IPROG
R
IREF
Ringing/Ring Trip
C
RING
R
RT1
R
RT2
C
FB1
Value
Tolerance
Rating
Function
0.1
μ
F
0.1
μ
F
1N4004
0.1
μ
F
0.22
μ
F
0.1
μ
F
2.0 k
20%
20%
—
20%
20%
20%
5%
100 V
50 V
—
10 V
100 V
100 V
2 W
V
BAT
filter capacitor.
V
BAT
filter capacitor. |V
BAT2
| < |V
BAT1
|.
Reverse current.
V
CC
filter capacitor.
Filter capacitor.
Filter capacitor.
Power control resistor, provides single battery supply operation.
5.76 k
28.7 k
1%
1%
1/16 W
1/16 W
With R
IREF
,
fixes dc current limit.
With R
IPROG
,
fixes dc current limit.
1.0
μ
F
133 k
75 k
0.01
μ
F
20%
1%
1%
20%
10 V
1/16 W
1/16 W
100 V
Ring trip filter capacitor.
Ring trip filter resistor.
Ring trip filter resistor.
With C
FB2
, slows rate of battery reversal. Sets crest factor of bal-
anced power ring signal.
With C
FB1
, slows rate of battery reversal. Sets crest factor of bal-
anced power ring signal.
C
FB2
0.01
μ
F
20%
100 V
ac Interface
R
GX
R
TGS
C
GS
C
TX
C
C1
C
C2
R
T3
R
T6
R
X
R
HB1
R
RCV
R
GP
C
N
R
N1
R
N2
4750
1.74 k
12 nF
0.1
μ
F
0.1
μ
F
0.1
μ
F
49.9 k
40.2 k
115 k
113 k
59.0 k
54.9 k
120 pF
127 k
47.5 k
1%
1%
5%
20%
20%
20%
1%
1%
1%
1%
1%
1%
20%
1%
1%
1/16 W
1/16 W
10 V
10 V
10 V
10 V
1/16 W
1/16 W
1/16 W
1/16 W
1/16 W
1/16 W
10 V
1/16 W
1/16 W
Sets T/R to VITR transconductance.
Gain shaping for complex termination.
Gain shaping for complex termination.
ac/dc separation.
dc blocking capacitor.
dc blocking capacitor.
With R
GP
and R
RCV
, sets termination impedance and receive gain.
With R
X
, sets transmit gain.
With R
T6
, sets transmit gain.
With R
X
, sets hybrid balance.
With R
GP
and R
T3
, sets termination impedance and receive gain.
With R
RCV
and R
T3
, sets termination impedance and receive gain.
High frequency compensation.
High frequency compensation.
High frequency compensation, compensate for dc offset at
RCVP/RCVN.