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Ericsson

PBL3726-18A Datasheet Preview

PBL3726-18A Datasheet

Universal Speech Circuit

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March 1996
PBL 3726/18A
Universal Speech Circuit
Description
PBL 3726/18A is a standard version of the PBL 3726 family of the mask-program-
mable, monolithic integrated speech circuits for use in electronic telephones.
It is designed for use with a low impedance microphone. Transmitting and receiv-
ing gain is regulated with line length. Different regulation for various current feeds
can be set by external resistors. Typical current feeds as 48 V, 2 x 200 ohm, 48 V
2 x 400 ohm and 48 V 2 x 800 ohm can be handled. Application dependent param-
eters such as line balance, side tone level, amplification and frequency response are
set by external components. Parameters are set independently which means easy
adoption for various market needs.
DTMF
input
10
AD
12
13 AM
DC
89 7
DC output for external
CMOS device
Sense Input
Control output
Mute
(active low)
5
1
PBL 3726/18
AT AR
17
18
6 5 11 3
2
24
15 16
+
14 4
3
1
Telephone
line
Key Features
• Minimum number of inexpensive
external components, 7 capacitors
and 11 resistors.
• Mute function for operation with
DTMF-generator.
• Transmit and receive gain regulation
for automatic loop loss compensa-
tion.
• Extended current and voltage range
5 - 130 mA, down to 2 V.
• Differential microphone input for
good balance to ground.
• Balanced receiver output stage.
• Short start-up time.
• Stabilized DC-supply for low current
CMOS diallers and/or electret
microphones.
• DTMF-input controlled by mute.
1 Impedance to line and radio interference suppression.
2 Transmit gain and frequency response network.
3 Receive gain and frequency response network.
4 Side tone balance network.
5 DC-supply components.
Figure 1. Functional diagram. DIP package.
18-pin plastic DIP
20-pin plastic SO
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Ericsson

PBL3726-18A Datasheet Preview

PBL3726-18A Datasheet

Universal Speech Circuit

No Preview Available !

PBL 3726/18A
Maximum Ratings
Parameter
Line voltage, t = 2 s
p
Line current, continuous DIP
Line current, continuous SO package
Operating temperature range
Storage temperature range
No input should be set on higher level than pin 4 (+C).
R L =0-4 K
0 OHM WHEN ARTIFICIAL
LINE IS USED
5H+5H
R feed =400+400
+
ARTIFICIAL
C1 LINE
IL
+
E= 48.5V
V2
V1
600
VL
C1 = 1µF when artificial cable is used.
470µF when not used
MUTE
IM
+ LINE
MIC
PBL 3726/18
with external
components
See fig.4
- LINE REC
V4
Symbol
V
L
IL
IL
TAmb
TStg
Min
01
0
0
-40
-55
Max
8
130
100
+70
+125
Unit
V
mA
mA
°C
°C
Z Mic =350
V3
Z Rec =350
Figure 2. Test set up without rectifier
bridge.
MUTE
R L =0-4 K5H+5H
R feed =400+400
+
Vz=(15-16)V
C1
1µF
IL
+
E= 50V
V2
V1
600
VL
IM
+ LINE
MIC
PBL 3726/18
with external
components
See fig.4
- LINE REC
V4
Z Mic =350
V3
Z Rec =350
Figure 3. Test set up with rectifier
bridge.
+Line
1
DTMF C8
input 220 nF
10
MIC.
350
12
R16
2.7k 13
AD
AM
PBL 3726/18
AT AR
DC supply for
CMOS dialler
Mute
DC
89 7
6
Sense Input
Control output
R1
+
47 µF C7
R2
5 11
R4
18k
R5
22k
32
C3
100 nF
R7
910
R6
75
R8
560
R9
11 k
C6
47 nF
R11
15
16
6k2
R13
100
C5 nF
11 k
R15
10
17
R14
310
REC.
18 350
+
14 4
R10
62 k R3
910
C1 +
47 µF
C2
15 nF
-Line
2
Figure 4. Circuit with external compon-
ents for test set up.
* Not used in test set up.
DIP package pinning.
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Part Number PBL3726-18A
Description Universal Speech Circuit
Maker Ericsson
Total Page 8 Pages
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