參數(shù)資料
型號(hào)： MC34216ADW
廠商： MOTOROLA INC
元件分類： 無(wú)繩電話/電話
英文描述： PROGRAMMABLE TELEPHONE LINE INTERFACE CIRCUIT WITH LOUDSPEAKER AMPLIFIER
中文描述： TELEPHONE MULTIFUNCTION CKT, PDSO28
封裝： PLASTIC, SO-28
文件頁(yè)數(shù)： 9/20頁(yè)
文件大?。?/td> 527K
代理商： MC34216ADW
MC34216A
9
MOTOROLA ANALOG IC DEVICE DATA
T2
C7
RXO1
Z0
Z21
Z1
T3
C20
R6
R9
C5
R12
ref
R20
RXO2
TXI
Mic
AHO1
MTC
MTF
AHO2
RXI
LAO
Gnd
V
HYN
NDC
SAO
LAI
IMP
I
Supply–
Stabilizer
References
Ring–
Regulator
DC Mask Generation
AC Termination
2–4 Wire Conversion
Line Length AGC
Protection
C12
Line +
Line –
26
27
25
6
7
1
21
AGnd
22
8
2
3
4
10
11
14
9
13
20
Anti–Howling
Microphone Threshold
Line
Driver
Ear
Mic
Mute, AGC
MC34216A
C17
AGC
28
CC
Mute, AGC
CM
C16
12
To IMP To SAI
To IMP
5
RS
19
Clk
18
D/HS
17
DTMF/Tone
and Ring
Generator
Micro–
Interface
Clock
Hook–Detect
Osc
16
X1
LPO
R30
LPI
23
24
LSP
C24
Volume
C29
C28
C27
C26
C25
To IMP
C21
R28
To
Micro–
controller
R1
SAI
15
Handset
Earpiece
Handset
Microphone
Speaker
Figure 2. Block Diagram of the MC34216A with Essential Components
DC CHARACTERISTICS AND STARTUP
2
1
3
4
VLC
IVLP
ILK
ILP
VLK
ILC
VLP
V
I
0
line
line
Region 1: Startup, Low Line Current, High Slope
Region 2: Mid Range Line Current, Small Slope
Region 3: High Line Current, High Slope
Region 4: Overload Protection
Figure 3. General Form of the
DC Mask of the MC34216A
The MC34216A offers the possibility to adjust the dc
characteristics of all 4 regions via both software and hardware
adjustments. The software adjustments make it possible to
program the 4 different basic masks: France, United Kingdom,
Low Voltage and Startup. The hardware adjustments can be
used for fine–tuning. The adjustment possibilities will be
discussed below with the aid of the block diagram of Figure 4.
In Region 1, the transfer of the amplifier G at the HYN input
equals zero. The voltage difference between SAO and SAI
will equal VO1. The slope RE1 of the Vline, Iline characteristic
will equal:
RE1
R1 x
1
Z0
Z21
In Region 2, the output current of the amplifier G will be
proportional to the input current. As a result, the voltage
between SAO and SAI will increase with the line voltage.
Speech signals on the line are of no influence on this
because they are filtered out via capacitor C16. The slope
RE2 of the Vline, Iline characteristic will equal:
RE2
R1 x
1
1
Ri
Z1
Z21
Z0
In Region 3, the output current of the amplifier G is kept
constant. As a result, the slope in Region 3 will equal the
slope of Region 1.
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