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參數(shù)資料
| 型號(hào)： | TCA3388FP |
| 廠商： | MOTOROLA INC |
| 元件分類： | 模擬傳輸電路 |
| 英文描述： | TELEPHONE LINE INTERFACE |
| 中文描述： | TELECOM-SLIC, PDSO20 |
| 封裝： | PLASTIC, SOIC-20 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 274K |
| 代理商： | TCA3388FP |
TCA3388
7
MOTOROLA ANALOG IC DEVICE DATA
DC CHARACTERISTICS AND STARTUP
The dc mask has the general form as depicted in Figure 3.
The TCA3388 offers the possibility to adjust the dc
characteristics of all 4 regions via mask selection and
hardware adjustments.
The selection of the 3 masks, France, United Kingdom
and Low Voltage, can be done via the ZDCM network at Pin
DCM as shown in Figure 4. For French and U.K. masks, the
region 3 with the high slope is within the normal dc feeding
conditions. For Low Voltage mask the region 3 will be outside
this and the dc mask is mainly determined by regions 1
and 2.
2
1
3
4
Figure 3. General Form of the DC Mask
of the TCA3388
VLine
ILine
VLP
VLK
VLC
0
ILC
ILP
ILK
IVLP
Region 1: Startup, Low Line Current, High Slope
Region 2: Mid–Range Line Current, Low Slope
Region 3: High Line Current, High Slope
Region 4: Overload Protection
V
I
0.5
2.0
2.5
3.0 3.2
4
11
14
0
LV
FR
U.K.
L.V.
FR
U.K.
C18
470 n
R25
1.0 M
R24
47 k
R23
56 k
C21
10
DCM
DCM
V
DCM
Figure 4. Selection of the Country Mask via Pin DCM
DCM(V)
DCM( A)
CC
μ
ZDCM for the L.V., U.K. and FR Mask
The capacitor in the U.K. network is to ensure a stable
selection of the mask during all working modes and
transitions. The capacitor in the French network is used to
create a startup in Low Voltage Mask.
The adjustment possibilities will be discussed below with
the aid of the block diagram of Figure 5.
Z21
T3
T2
Z2
VO1
RX
Z0
R5
VO2
C7
2 V
V
Line +
HYL
LAI
SAO
SAI
LAO
Line –
Gnd
I
R1
TCA3388
C16
1.6 V
IMP
CM
HYS
Z1
CM
Figure 5. DC Part of the Block Diagram of the TCA3388
BE
2L
I2S
G
G
CC
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