mc34216adwf Freescale Semiconductor, Inc, mc34216adwf Datasheet - Page 9

• Manufacturer Part Number: mc34216adwf
• Description: Programmable Telephone Line Interface Circuit With Loudspeaker Amplifier
• Manufacturer: Freescale Semiconductor, Inc

characteristics of all 4 regions via both software and hardware
Microphone
Earpiece
Speaker
Handset
MOTOROLA ANALOG IC DEVICE DATA
The MC34216A offers the possibility to adjust the dc
Handset
VLP
VLK
VLC
0
V
Line +
Line –
line
C24
C20
Figure 3. General Form of the
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
R9
1
DC Mask of the MC34216A
R30
R28
ILC
R6
C5
2
LPO
C21
RXO1
RXO2
RXI
TXI
Mic
LPI
Figure 2. Block Diagram of the MC34216A with Essential Components
26
27
25
23
24
6
7
To IMP
4
Volume
Mute, AGC
ILP
Mute, AGC
28
Mic
Ear
LSP
AGC
C17
C25
DC CHARACTERISTICS AND STARTUP
ILK
3
R20
Z1
10
IVLP
1
HYN
AHO1
C26
Microphone Threshold
I
line
MC34216A
DC Mask Generation
2–4 Wire Conversion
Line Length AGC
AC Termination
Anti–Howling
2
Protection
12
MC34216A
To IMP To SAI
AHO2
C27
CM
C16
3
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.
equals zero. The voltage difference between SAO and SAI
will equal V O1 . The slope R E1 of the V line , I line characteristic
will equal:
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
R E2 of the V line , I line characteristic will equal:
constant. As a result, the slope in Region 3 will equal the
slope of Region 1.
11
MTF
C28
In Region 1, the transfer of the amplifier G at the HYN input
In Region 2, the output current of the amplifier G will be
In Region 3, the output current of the amplifier G is kept
NDC
C12
14
4
To IMP
MTC
C29
SAO
Z21
R
E2
SAI
15
DTMF/Tone
Generator
9
and Ring
R
+
E1
LAI
Z0
R1 x 1
+
13
R1 x 1
Hook–Detect
References
Interface
16
Regulator
IMP
Stabilizer
Micro–
Supply–
Clock
)
Line
Driver
Ring–
20
Osc
Z1
Ri
X1
)
I
R12
ref
)
Z21
1
Z0
Z21
Z0
V
21
AGnd
5
Gnd
22
LAO
8
RS
19
Clk
18
D/HS
17
CC
T3
R1
controller
Micro–
To
T2
9
C7