UTC TEA1110A
LINEAR INTEGRATED CIRCUIT
LOW VOLTAGE VERSATILE
TELEPHONE TRANSMISSION
CIRCUIT WITH DIALLER
INTERFACE
DESCRIPTION
The UTC TEA1110A is a bipolar integrated circuit that
performs all speech and line interface functions required in
fully electronic telephone sets. It performs electronic
switching between speech and dialling. The IC operates at a
line voltage down to 1.6 V DC (with reduced performance) to
facilitate the use of telephone sets connected in parallel.
SOP-14
DIP-14
FEATURES
*Low DC line voltage; operates down to 1.6 V (excluding
voltage drop over external polarity guard)
*Voltage regulator with adjustable DC voltage
*Provides a supply for external circuits
*Symmetrical high impedance inputs (64kΩ) for dynamic,
magnetic or piezo-electric microphones
*Asymmetrical high impedance input (32kΩ) for electric
microphones
*DTMF input with confidence tone
*MUTE input for pulse or DTMF dialling
*Receiving amplifier for dynamic, magnetic or piezo-electric
earpieces
*AGC line loss compensation for microphone and earpiece
amplifiers.
APPLICATIONS
*
Line powered telephone sets, cordless
telephones, fax machines, answering machines.
PIN CONFIGURATION
LN
SLPE
REG
n.c.
DTMF
MUTE
IR
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Vcc
GAR
QR
VEE
MIC+
MIC-
AGC
UTC
UNISONIC TECHNOLOGIES CO., LTD.
1
QW-R108-014,A
UTC TEA1110A
PIN DESCRIPTION
SYMBOL
LN
SLPE
REG
n.c.
DTMF
MUTE
IR
AGC
MIC-
MIC+
VEE
QR
GAR
Vcc
LINEAR INTEGRATED CIRCUIT
PAD No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
PIN No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
DESCRIPTION
Positive line terminal
Slope (DC resistance) adjustment
Line voltage regulator decoupling
Not connected
Dual-tone multi-frequency input
Mute input to select speech or dialing mode (active LOW)
Receiving amplifier input
Automatic gain control/line loss compensation
Inverting microphone amplifier input
Non-inverting microphone amplifier input
Negative line terminal
Earpiece amplifier output
Earpiece amplifier gain adjustment
Supply voltage for internal circuit
BONDING PAD LOCATIONS
SYMBOL
LN
SLPE
RGE
n.c.
DTMF
MUTE
IR
AGC
MIC-
MIC+
V
EE
QR
GAR
Vcc
PAD No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
COORDINATES
x
-791
-767.5
-445
-157.5
467
780.5
774.5
774.5
629.5
375
-121.5
-536.5
-791
-791
y
-82
-460
-460
-460
-460
-459
-205.5
241
461
461
461
461
471
227.5
UNIT:
μ
m
UTC
UNISONIC TECHNOLOGIES CO., LTD.
2
QW-R108-014,A
UTC TEA1110A
PARAMETER
LINEAR INTEGRATED CIRCUIT
SYMBOL
V
LN
V
n (max)
I
Iine
Ptot
Tstg
Ta
Tj
ABSOLUTE MAXIMUM RATINGS
RATINGS
V
EE
-0.4 ~ 12
V
EE
-0.4 ~ 13.2
V
EE
-0.4 ~V
CC
+0.4
140
588
384
-40~+125
-25~+75
125
UNIT
V
V
V
mA
mW
℃
℃
℃
Positive continuous line voltage
Repetitive line voltage during switch-on or line interruption
Maximum voltage on all pins
Maximum line current (R
SLPE
=20Ω)
Total power dissipation (Ta=75℃)
DIP-14
SOP-14
Storage temperature
Ambient temperature
Maximum Junction temperature
ELECTRIC CHARACTERISTICS
(I
line
=15mA, V
EE
=0V, R
SLPE
=20Ω, AGC pin connected to VEE, Z
line
=600Ω, f=1kHz, Ta=25℃, unless otherwise
specified)
PARAMETER
SYMBOL
CONDITIONS
MIN
3.1
TYP
3.35
1.6
2.3
3.65
4.4
MAX
3.6
UNIT
V
V
V
V
V
V
Supplies (pins VLN, VCC, SLPE and REG)
Stabilized voltage between
V
ref
LN and SLPE
DC line voltage
V
LN
I
line
= 1 mA
I
line
= 4 mA
I
line
= 15 mA
I
line
= 140 mA
R
VA(SLPE-REG)
= 27kΩ
3.35
3.95
6.9
DC line voltage with an external
resistor RVA
DC line voltage variation with
temperature referred to 25 °C
internal current consumption
V
LN(exR)
∆V
LN(T)
I
CC
T
a
= -25 to +75 °C
±30
mV
V
CC
= 2.9 V
Ip=0mA
Ip=0.5mA
1.1
2.9
550
1.4
mA
V
Ω
Supply voltage for peripherals
Vcc
Equivalent supply voltage
Rccint
resistance
Microphone amplifier (pins MIC+ and MIC-)
Voltage gain from MIC+/MIC- to LN
Gvtx
Gain variation with frequency
∆G
vtx(f)
referred to 1 kHz
Gain variation with temperature
∆G
vtx(T)
referred to 25℃
Common mode rejection ratio
CMRR
Maximum sending signal(RMS
V
LN(max)
value)
(rms)
620
V
MIC
= 4 mV (RMS)
f = 300 to 3400 Hz
Ta = -25 to +75 °C
42.7
43.7
±0.2
±0.3
80
1.7
0.8
-78.5
44.7
dB
dB
dB
dB
V
V
dBmp
Iline = 15 mA; THD = 2%
Iline = 4 mA, THD = 10%
1.4
Noise output voltage at pin LN,
pins MIC+/MIC- shorted through
V
notx
200Ω
Receiving amplifier (pins IR, QR and GAR)
Voltage gain from IR to QR
Gvrx
VIR = 4 mV (RMS)
32
33
34
dB
UTC
UNISONIC TECHNOLOGIES CO., LTD.
3
QW-R108-014,A
UTC TEA1110A
PARAMETER
Gain variation with frequency
referred to kHz
Gain variation with temperature
referred to25°C
Gain voltage reduction range
Maximum receiving signal
(RMS value)
Noise output voltage at pin R
(RMS value)
Automatic gain control (pin AGC)
Gain control range for microphone
and receiving amplifiers with
respect to IIine=15mA
Highest line current for maximum
gain
Lowest line current for minimum
gain
DTMF amplifier (pin DTMF)
Voltage gain from DTMF to LN
LINEAR INTEGRATED CIRCUIT
SYMBOL
CONDITIONS
MIN
TYP
±0.2
±0.3
14
0.25
0.35
-87
dBVp
MAX
UNIT
dB
dB
dB
V
∆Gvrx(f)
f = 300 to 3400 Hz
∆Gvrx(T)
∆G
vrxr
V
o(rms)
Ta = -25 to +75 °C
external resistor connected
between GAR and QR
I
P
= 0 mA sine wave drive,
R
L
= 150Ω, THD = 2%
I
P
= 0 mA sine wave drive,
R
L
= 450
Ω,
THD = 2%
Gvrx = 33 dB, IR
open-circuit, RL = 150
Ω
V
norx(rms)
∆Gvtrx
Istart
Istop
Gvdtmf
I
line
= 85 mA
5.9
23
56
dB
mA
mA
26.5
dB
dB
dB
dB
V
EE
+0.3
V
CC
+0.4
V
V
μA
dB
Gain variation with frequency
∆G
vdtmf(f)
referred to 1kHz
Gain variation with temperature
∆G
vdtmf(T)
referred to25°C
Voltage gain from DTMF to QR
Gvct
(confidence tone)
Mute function (pin MUTE)
LOW level input voltage
V
IL
HIGH level input voltage
V
IH
Input current
I
MUTE
Gain reduction for microphone and
∆G
vtrxm
receiving amplifiers
V
DTMF
= 20 mV (RMS),
MUTE = LOW
f = 300 to 3400 Hz
T
a
= -25 to +75 °C
V
DTMF
= 20 mV (RMS),
R
L
= 150
Ω
24.1
25.3
±0.2
±0.4
-15
V
EE
- 0.4
V
EE
+1.5
1.5
MUTE = LOW
80
UTC
UNISONIC TECHNOLOGIES CO., LTD.
4
QW-R108-014,A
UTC TEA1110A
Dialling or Flash facilities)
LINEAR INTEGRATED CIRCUIT
APPLICATION INFORMATION CIRCUIT
(Typical application of the UTC TEA1110A in sets with Pulse
a/b
VDR
95V
-
Rprotect
10Ω
4×
BAS11
+
Rast1
130kΩ
C
IR
IR
QR
LN
Rcc
619Ω
Vcc
DTMF
Rpd4
signal from
dial and
control circuits
C
VCC
100μF
BC558
telephone
line
Rast2
100pF
3.92kΩ
C
GARS
Rast3
390Ω
Zbal
C
GAR
GAR
MIC+
UTC
TEA1110A
Rpd5
470kΩ
1nF
b/a
BZX79C10
MIC-
SLPE REG
R
SLPE
20Ω
+
MUTE
AGC V
EE
470kΩ
+
supply for
peripheral
circuits
R
pd6
BC547
68kΩ
BF473
C
REG
4.7μF
PD
input
R
pd1
BSN254
BC547
R
limit
3.9Ω
470kΩ
BZX79C10
R
pd2
470kΩ
Rpd3
1MΩ
FUNCTIONAL DESCRIPTION
Supply (pins LN, SLPE, VCC and REG)
The supply for the UTC TEA1110A and its peripherals is obtained from the telephone line (see Fig.1). The IC
generates a stabilized reference voltage (Vref) between pins LN and SLPE. Vref is temperature compensated and
can be adjusted by means of an external resistor (R
VA
). Vref equals 3.35 V and can be increased by connecting R
VA
between pins REG and SLPE (see Fig.2), or decreased by connecting RVA between pins REG and LN. The voltage
at pin REG is used by the internal regulator to generate Vref and is decoupled by C
REG
, which is connected to V
EE
.
This capacitor, converted into an equivalent inductance (see Section “Set impedance”), realizes the set impedance
conversion from its DC value (R
SLPE
) to its AC value (R
CC
in the audio-frequency range). The voltage at pin SLPE is
proportional to the line current.
The voltage at pin LN is:
V
LN
=V
ref
+R
SLPE
×I
SLPE
I
SLPE
=I
Iine
-Icc-Ip-I*
Where:
Iline = line current
Icc = current consumption of the IC
I
P
= supply current for peripheral circuits
I* = current consumed between LN and VEE.
The preferred value for R
SLPE
is 20
Ω.
Changing R
SLPE
will affect more than the DC characteristics; it also
influences the microphone and DTMF gains, the gain control characteristics, the sidetone level and the maximum
output swing on the line.
UTC
UNISONIC TECHNOLOGIES CO., LTD.
5
QW-R108-014,A
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