INTEGRATED CIRCUITS
DATA SHEET
TEA1065
Versatile telephone transmission
circuit with dialler interface
Product specification
File under Integrated Circuits, IC03A
March 1994
Philips Semiconductors
Product specification
Versatile telephone transmission circuit with
dialler interface
FEATURES
•
Current and voltage regulator mode with adjustable
static resistances
•
Provides supply for external circuitry
•
Symmetrical high-impedance inputs for piezoelectric
microphone
•
Asymmetrical high-impedance input for electret
microphone
•
DTMF signal input with confidence tone
•
Mute input for pulse or DTMF dialling
•
Power-down input for pulse dial or register recall
•
Digital pulse input to drive an external switch transistor
•
Receiving amplifier for magnetic, dynamic or
piezoelectric earpieces
ORDERING INFORMATION
EXTENDED TYPE
NUMBER
TEA1065
TEA1065T
Notes
1. SOT101-1; 1998 Jun 18.
2. SOT137-1; 1998 Jun 18.
QUICK REFERENCE DATA
SYMBOL
V
LN
I
line
I
CC
line voltage
normal operation line current range
internal supply consumption
power-down input LOW
power-down input HIGH
V
CC
supply voltage for peripherals
I
line
= 15 mA;
MUTE input
HIGH
I
P
= 1.2 mA
I
P
= 1.55 mA
G
V
voltage gain range
microphone amplifier
earpiece amplifier
∆G
V
T
amb
March 1994
line loss compensation
gain control range
operating ambient temperature range
2
−5.5
−25
−5.9
−
−6.3
+75
30
20
−
−
46
45
2.7
2.5
−
−
−
−
−
−
1.14
73
1.5
105
PARAMETER
CONDITIONS
I
line
= 15 mA
10
MIN.
4.25
−
TYP.
4.45
24
24
PACKAGE
PINS
DIL
SO24
PIN POSITION
MATERIAL
plastic
plastic
TEA1065
•
Large gain setting range on microphone and earpiece
amplifiers
•
Line loss compensation facility, line current dependent
(on microphone and earpiece amplifiers)
•
Adjustable gain control
•
DC line voltage adjustment facility
GENERAL DESCRIPTION
The TEA1065 is a bipolar integrated circuit which performs
all speech and line interface functions that are required in
fully electronic telephone sets with adjustable DC mask.
The circuit performs electronic switching between dialling
and speech internally.
CODE
SOT101L
SOT137A
MAX.
4.65
150
V
UNIT
mA
mA
µA
V
V
dB
dB
dB
°C
Philips Semiconductors
Product specification
Versatile telephone transmission circuit with
dialler interface
TEA1065
handbook, full pagewidth
17
IR
+
−
TEA1065
−
+
+
−
6
5
4
GAR
QR+
QR−
MIC+
MIC−
8
7
+
−
−
dB
2
1
GAS1
LN
−
+
24
3
DTMF
MUTE
VCC
PD
19
20
21
18
SLPE
GAS2
+
BANDGAP
REFERENCE
11
SUPPLY AND
REFERENCE
CONTROL
CURRENT
VBG
13
REFI
+
−
LINE
CURRENT
CONTROL
12
DOC
CURRENT
REFERENCE
16
VEE
22
REG
23
AGC
9
STAB
10
DPI
14
VSI
15
CURL
MBA557
Fig.1 Block diagram.
March 1994
3
Philips Semiconductors
Product specification
Versatile telephone transmission circuit with
dialler interface
PINNING
SYMBOL PIN
LN
GAS1
GAS2
QR−
QR+
GAR
MIC−
MIC+
STAB
DPI
VBG
DOC
REFI
VSI
CURL
V
EE
IR
PD
DTMF
MUTE
V
CC
REG
AGC
SLPE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
DESCRIPTION
positive line terminal
gain adjustment; sending amplifier
gain adjustment; sending amplifier
inverting output; receiving amplifier
non-inverting output; receiving
amplifier
gain adjustment; receiving amplifier
inverting microphone input
non-inverting microphone input
current stabilizer
digital pulse input
bandgap output reference
drive current output
reference voltage input
voltage sense input
current limitation input
negative line terminal
receiving amplifier input
power-down input
dual-tone multifrequency input
MUTE input
positive supply decoupling
voltage regulator decoupling
automatic gain control input
slope (DC resistance) adjustment
Fig.2 Pinning diagram.
STAB 9
DPI 10
VBG 11
DOC 12
MBA551
TEA1065
handbook, halfpage
LN 1
GAS1 2
GAS2 3
QR− 4
QR+ 5
GAR 6
24 SLPE
23 AGC
22 REG
21 VCC
20 MUTE
19 DTMF
TEA1065
MIC− 7
MIC+ 8
18 PD
17 IR
16 VEE
15 CURL
14 VSI
13 REFI
March 1994
4
Philips Semiconductors
Product specification
Versatile telephone transmission circuit with
dialler interface
FUNCTIONAL DESCRIPTION
Supply: V
CC
, LN, SLPE, REG and STAB
The circuit and its peripherals are usually supplied from the
telephone line. The circuit develops its own supply voltage
at V
CC
(pin 21) and regulates its voltage drop between LN
and SLPE (pins 1 and 24). The internal supply requires a
decoupling capacitor between V
CC
and V
EE
(pin 16); the
internal voltage regulator has to be decoupled by a
capacitor from REG (pin 22) to V
EE
. The internal current
stabilizer is set by a 3.6 kΩ resistor connected between
STAB (pin 9) and V
EE
.
The TEA1065 can be set either in a DC voltage regulator
mode or in a DC current regulator mode. The DC mask can
be selected by connecting the appropriate external
components to the dedicated pins (VSI, REFI, DOC,
VBG).
When the DC current regulator mode is not required it can
be cancelled by connecting pin VSI to V
EE
; pins REFI,
VBG and DOC are left open-circuit.
Voltage regulator mode
The voltage regulator mode is achieved when the line
current is less than the current I
knee
as illustrated in Fig.3.
With R13 = R14 = 30 kΩ, the current I
knee
= 30 mA
(I
p
= 0 mA).
TEA1065
This line current value will be reached when the voltage on
pin VSI (almost equal to the voltage on pin SLPE) exceeds
the voltage on pin REFI (equal to the voltage on pin VBG
divided by the resistor tap R13, R14). For other values of
R13 and R14, the I
knee
current is given by the following
formula:
I
knee
= I
CC
+
I
P
+
(VBG/R9)
×
{R14/(R14
+
R13)}
−
(R15/R9)
×
I
O
(VSI)
I
CC
is the current required by the circuit itself
(typ. 1.14 mA). I
P
is the current required by the peripheral
circuits connected between V
CC
and V
EE
. I
O(VSI)
is the
output current from pin VSI (typ. 2.5
µA).
The DC slope of the V
line
/I
line
curve is, in this mode,
determined by R9 (R9 = R9a
+
R9b) in series with the
r
ds
of the external line current control transistor (see Fig.4;
r
ds
=
∂V
GS
/∂I
D
at V
GS
= V
DS
).
Current regulator mode
The current regulator mode is achieved when the line
current is greater than I
knee
. In this mode, the slope of the
V
line
/I
line
curve is approximately 1300
Ω
with R9 = 20
Ω,
R16 = 1 MΩ, R13 = R14 = 30 kΩ. For other values of
these resistances, the slope value can be approximated by
the following formula:
R9
×
{1
+
R16
×
(1/R13
+
1/R14)}
handbook, full pagewidth
MBA567
line
current
Iknee
0
0
voltage
regulator
mode
current
regulator
mode
set
voltage
Fig.3 Voltage and current regulator mode.
March 1994
5
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