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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(yè)數(shù)： | 6/16頁(yè) |
| 文件大?。?/td> | 274K |
| 代理商： | TCA3388FP |
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TCA3388
6
MOTOROLA ANALOG IC DEVICE DATA
DESCRIPTION OF THE CIRCUIT
Concept
With a TCA3388, a microcontroller and a ringer, a basic
telephone set can be built according to the concept depicted
in Figure 1.
In off–hook position, the application is in speech mode.
The line current flows through transistor T2 and supplies the
externals (microcontroller) at the supply point VCC which is
stabilized by the TCA3388. The Vline, Iline characteristic is
adjusted by the external components Z0, Z1, Z21 and R1
which are in a regulator loop, acting on transistor T2. The ac
impedance is generated in a similar way. The handset can be
connected directly to the TCA3388. Via a logic level interface,
the microcontroller drives the TCA3388 to perform the
DTMF/pulse–dialing. The user keyboard has to be connected
to the microcontroller. In on–hook position, a ringing melody
can be generated with a ringer application.
The block diagram of the TCA3388, in Figure 2, shows the
basic blocks of the device plus the essential external
components.
Figure 1. Telephone Concept with TCA3388
Ringer
R1
Micro
TCA3388
T2
Z0
Z1
Z21
Handset
A/B
Hookswitch
VCC
Gnd
T2
C7
RXO1
Z0
Z21
Z2
T3
C20
R6
R9
C5
R12
R19
RXO2
TXI
Mic
DCM
MUT
PI
15
HSO
RXI
LAO
Gnd
V
HYS
CM
SAO
LAI
IMP
I
Supply–
Stabilizer
References
DC Mask Generation
AC Termination
2–4 Wire Conversion
Line Length AGC
Protection
C16
To/From
Microcontroller
Line +
Line –
19
20
1
2
3
12
17
18
4
13
14
7
8
10
5
9
16
Micro–Interface
Hook–Detect
PABX
Line
Driver
Ear
Mic
Mute, AGC
TCA3388
Z1
R20
C17
6
HYL
SAI
11
Z
R1
R22
DTMF
Figure 2. Block Diagram of the TCA3388 with Essential Components
ref
CC
Mute, AGC
DCM
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