Datasheet

UNISONIC TECHNOLOGIES CO., LTD
TEA1110A
LINEAR INTEGRATED CIRCUIT
LOW VOLTAGE VERSATILE
TELEPHONE TRANSMISSION
CIRCUIT WITH DIALLER
INTERFACE

SOP-14
DESCRIPTION
The UTC TEA1110A is a versatile telephone transmission circuit
providing full speech and line interface functions in electronic
telephone sets. This device works at a line voltage which can be as
low as 1.6V DC (with reduced performance) to enable parallel
connection of telephone sets. It also realizes electronic switching
between speeches and dialling.
The UTC TEA1110A is ideal for applications, such as line
powered telephone sets, cordless telephones, and fax machines,
answering machines.

DIP-14
FEATURES
* Low DC line voltage; operates down to 1.6V (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.

ORDERING INFORMATION
Ordering Number
Lead Free
TEA1110AL-D14-T
-
Halogen Free
TEA1110AG-D14-T
TEA1110AG-S14-R
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Copyright © 2015 Unisonic Technologies Co., Ltd
Package
Packing
DIP-14
SOP-14
Tube
Tape Reel
1 of 9
QW-R108-014.D
TEA1110A

LINEAR INTEGRATED CIRCUIT
MARKING
DIP-14

SOP-14
PIN CONFIGURATION
14 VCC
LN 1
SLPE 2

13 GAR
REG 3
12 QR
NC 4
11 VEE
DTMF 5
10 MIC+
MUTE 6
9
MIC-
IR 7
8
AGC
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
PAD NO.
1
2
3
4
5
SYMBOL
LN
SLPE
REG
NC
DTMF
DESCRIPTION
Positive line terminal
Slope (DC resistance) adjustment
Line voltage regulator decoupling
Not connected
Dual-tone multi-frequency input
6
6
MUTE
Mute input to select speech or dialing mode (active LOW)
7
8
9
10
11
12
13
14
7
8
9
10
11
12
13
14
IR
AGC
MICMIC+
VEE
QR
GAR
VCC
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
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2 of 9
QW-R108-014.D
TEA1110A

LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
UNIT
Positive Continuous Line Voltage
V
VEE-0.4 ~ 12
VLN
Repetitive Line Voltage During Switch-on or
VEE-0.4 ~ 13.2
V
Line Interruption
Maximum Voltage On All Pins
VN(MAX)
VEE -0.4 ~VCC+0.4
V
Maximum Line Current (RSLPE=20Ω)
ILINE
140
mA
DIP-14
588
mW
Power Dissipation (Ta=75°C)
PD
SOP-14
384
mW
Junction Temperature
TJ
125
°C
Ambient Temperature
TOPR
-25~+75
°C
Storage Temperature
TSTG
-40~+125
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.

THERMAL DATA
PARAMETER
Junction to Ambient
SYMBOL
DIP-14
SOP-14
θJA
RATINGS
85
130
UNIT
°C/W
°C/W
Note: Mounted on epoxy board

ELECTRIC CHARACTERISTICS (Ta=25°C, unless otherwise specified)
(ILINE=15mA, VEE=0V, RSLPE=20Ω, AGC pin connected to VEE, ZLINE=600Ω,f=1kHz)
PARAMETER
SYMBOL
CONDITIONS
Supplies (pins VLN, VCC, SLPE and REG)
Stabilized Voltage Between LN and SLPE VREF
ILINE =1mA
ILINE =4mA
DC Line Voltage
VLN
ILINE =15mA
ILINE =140mA
DC line voltage with an external resistor
VLN(exR) RVA(SLPE-REG) = 27kΩ
RVA
DC line voltage variation with
VLN(T) Ta = -25 ~ +75 °C
temperature referred to 25 °C
internal current consumption
ICC
VCC = 2.9 V
Supply voltage for peripherals
VCC
IP=0mA
Equivalent supply voltage resistance
RCCint IP=0.5mA
Microphone amplifier (pins MIC+ and MIC-)
Voltage gain from MIC+/MIC- to LN
GVTX VMIC =4mV (RMS)
Gain variation with frequency referred to
GVTX(F) f =300~3400 Hz
1kHz
Gain variation with temperature referred
GVTX(T) Ta =-25~+75 °C
to 25°C
Common mode rejection ratio
CMRR
Maximum sending signal
VLN(MAX) ILINE =15mA; THD=2%
(RMS value)
(rms) ILINE =4mA, THD=10%
Noise output voltage at pin LN, pins
VNOTX
MIC+/MIC- shorted through 200Ω
UNISONIC TECHNOLOGIES CO., LTD
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MIN
TYP MAX UNIT
3.1
3.35
1.6
2.3
3.65
3.35
42.7
1.4
3.6
3.95
6.9
V
V
V
V
V
4.4
V
±30
mV
1.3
2.9
550
1.48
620
mA
V
Ω
43.7
44.7
dB
±0.2
dB
±0.3
dB
80
1.7
0.8
dB
V
V
-78.5
dBmp
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TEA1110A

LINEAR INTEGRATED CIRCUIT
ELECTRIC CHARACTERISTICS(Cont.)
PARAMETER
SYMBOL
CONDITIONS
MIN
Receiving amplifier (pins IR, QR and GAR)
Voltage gain from IR to QR
GVRX VIR = 4mV (RMS)
32
Gain variation with frequency referred to
GVRX(F) f = 300~3400 Hz
1kHz
Gain variation with temperature referred
GVRX(T) Ta = -25 ~ +75 °C
to 25°C
external resistor connected between
Gain voltage reduction range
GVRXR
GAR and QR
IP =0mA sine wave drive
RL = 50Ω, THD =2%
Maximum receiving signal
VO(rms)
(RMS value)
IP = 0mA sine wave drive
RL =450 Ω, THD =2%
Noise output voltage at pin R
GVRX =33dB, IR open-circuit,
VNORX(rms)
(RMS value)
RL =150Ω
Automatic gain control (pin AGC)
Gain control range for microphone and
receiving amplifiers with respect to
GVTRX ILINE = 85mA
ILINE=15mA
Highest line current for maximum gain
ISTART
Lowest line current for minimum gain
ISTOP
DTMF amplifier (pin DTMF)
VDTMF = 20mV (RMS)
24.1
Voltage gain from DTMF to LN
GVDTMF
MUTE = LOW
Gain variation with frequency referred to
1kHz
Gain variation with temperature referred
to25°C
Voltage gain from DTMF to QR
(confidence tone)
Mute function (pin MUTE)
34
dB
±0.2
dB
±0.3
dB
14
0.25
dB
V
0.35
-87
dBVp
5.9
dB
23
56
mA
mA
25.3
26.5
dB
±0.2
dB
GVDTMF(T) Ta = -25 ~ +75 °C
±0.4
dB
-15
dB
GVCT
VIL
HIGH level input voltage
VIH
VDTMF = 20mV (RMS)
RL = 150 Ω
IMUTE
GVTRXM
VEE
+0.3
VCC
+0.4
VEE
-0.4
VEE
+1.5
MUTE = LOW
UNISONIC TECHNOLOGIES CO., LTD
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33
GVDTMF(F) f = 300~3400Hz
LOW level input voltage
Input current
Gain reduction for microphone and
receiving amplifiers
TYP MAX UNIT
V
V
1.5
μA
80
dB
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TEA1110A

LINEAR INTEGRATED CIRCUIT
APPLICATION INFORMATION CIRCUIT
Typical application of the UTC TEA1110A in sets with Pulse Dialling or Flash facilities
RCC
Rprotect
10Ω
BZX79C10
4×
BAS11
a/b
Telephone
line
VDR
95V
+
619
Rast1
130KΩ
CIR
LN
IR
QR
C
GAR
Rast2 100pF
3.92kΩ
Rast3
390Ω
Zbal
signal from
dial and
control circuits
DTMF
MUTE
AGC VEE
MIC SLPE REG
RSLPE
20Ω
supply for
peripheral
circuits
UTC
TEA1110A
GAR
1 nF
+
Vcc
MIC +
CGARS
CVCC
100μF
+C
Rpd4
REG
4.7μF
BC558
Rpd5
470kΩ
470kΩ
Rpd6
BSN254
b/a
BF473
Rpd1
BC547
68kΩ
PD
input
470kΩ
BC547
RLIMIT
3.9Ω
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BZX79C10 Rpd2
470kΩ
Rpd3
1MΩ
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TEA1110A

LINEAR INTEGRATED CIRCUIT
FUNCTIONAL DESCRIPTION
Supply (pins LN, SLPE, VCC and REG)
The UTC TEA1110A and its peripheral circuit derive the power supply from telephone line (see Fig.1). The IC
generates a stabilized reference voltage (VREF) between pins LN and SLPE. The voltage at pin SLPE is proportional
to the line current. VREF is temperature compensated and can be adjusted by means of an external resistor (RVA).
VREF is set to 3.35 V, which can be increased by connecting RVA between pins REG and SLPE (see Fig.2) and be
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, which is connected to VEE. This CREG capacitor converted into an equivalent
inductance (see Section “Set impedance”) realizes the set impedance conversion from its DC value (RSLPE) to its AC
value (RCC in the audio-frequency range).
In the following formula, the most appropriate value for RSLPE is 20 Ω. The changing of RSLPE will affect the DC
characteristics; furthermore, it can influence the microphone and DTMF gains, the gain control characteristics, the
side tone level and the maximum output swing on the line.
The voltage at pin LN is:
VLN = VREF +RSLPE×ISLPE
ISLPE = IIINE-ICC-IP-I*
Where: ILINE = line current
ICC = current consumption of the IC
IP = supply current for peripheral circuits
I* = current consumed between LN and VEE.
Rline
RCC
Rexch
+
-
619Ω
LN
1
lline
VCC
14
IP
UTC
TEA1110A
I*
Ish
+
-
ISLPE
+ CVCC Peripheral
100μF circuits
from pre amp
Vd
Vexch
ICC
+
3
REG
+
CREG
4.7μF
2
SLPE
RSLPE
20Ω
11
VEE
Fig 1. Supply configuration.
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6 of 9
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TEA1110A

LINEAR INTEGRATED CIRCUIT
FUNCTIONAL DESCRIPTION(Cont.)
Fig.2 Reference voltage adjustment by RVA
6.0
5.0
4.0
(1)
(2)
3.0
104
105
RVA (Ω)
106
107
(1) Influence of RVA on VREF
(2) VREF without influence of RVA
The internal circuitry of the UTC TEA1110A is supplied from pin VCC which can be used to supply peripheral
circuits such as dialling or control circuits. This voltage supply is derived from the line voltage by means of a resistor
(RCC) and it must be decoupled by a capacitor CVCC. The VCC voltage depends on the current consumed by the IC
and the peripheral circuits as shown by the formula :( RCCint is the internal equivalent resistance of the voltage
supply, and Irec is the current consumed by the output stage of the earpiece amplifier))
VCC= VCC0 - RCCint × (IP-IREC)
V CC0= VLN-RCC × ICC (see also Figs 3 and 4).
The DC line current flowing into the set is determined by the exchange supply voltage (Vexch), the feeding
bridge resistance (Rexch), the DC resistance of the telephone line (Rline) and the reference voltage (VREF). The
internal reference voltage (generating VREF) would be automatically adjusted to a lower value when the line currents
drop below 7.5mA. Therefore, more sets can work in parallel with DC line voltages (excluding the polarity guard)
down to 1.6V (absolute minimum voltage). At currents below 7.5mA, the circuit has limited sending and receiving
levels. This is called the low voltage area.
2.5
2
Rccint
Vcc
1.5
+
Vcco
Irec
1
Ip
VEE
(1)
(2)
0.5
PERIPHERAL
CIRCUIT
(1) With RVA resistor.
(2) Without RVA resistorl
0
0
1
2
Vcc (V)
3
4
Fig.3 Typical current IP available from VCC for peripheral
circuits at ILINE=15mA.
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Fig.4
VCC supply voltage for peripherals
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QW-R108-014.D
TEA1110A

LINEAR INTEGRATED CIRCUIT
FUNCTIONAL DESCRIPTION(Cont.)
Set impedance
The dynamic impedance is mainly determined by the RCC resistor within the audio frequency range. The
equivalent impedance of the circuit is shown in Fig.5.
LN
Rcc
619Ω
Rp
LEQ
Vref
SLPE
REG
+
RSLPE
VEE
20Ω
CREG
4.7μF
LEQ=CREG × RSLPE × Rp
Rp=internal resistance
Rp=15.5kΩ
Vcc
+
Cvcc
100μF
Fig.5 Equivalent impedance between LN and VEE
Microphone amplifier (pins MIC+ and MIC-)
The UTC TEA1110A has symmetrical microphone inputs. The input impedance between pin MIC+ and pin MICis 64kΩ (2 × 32kΩ). On this microphone amplifier, automatic gain control is used for line loss compensation.
Receiving amplifier (pins IR, GAR and QR)
The receiving amplifier has one input (IR) and one output (QR). The input impedance between pin IR and pin
VEE is 20kΩ. Connecting an external resistor RGAR between pins GAR and QR can decrease the voltage gain within
14dB from pin IR to pin QR. The two external capacitors CGAR (connected between pins GAR and QR) and CGARS
(connected between GAR and VEE) ensure stability, the CGAR capacitor provides a first-order low-pass filter. The
cut-off frequency corresponds to the time constant CGAR × (RGARint // RGAR). And the RGARint is the internal resistor
connected between pins GAR and QR which sets a 125 kW typ gain. The condition CGARS = 10 ×CGAR is required to
ensure stability.
The output voltage of the receiving amplifier is for continuous wave drive specially. The maximum output swing
depends on the DC line voltage, the RCC resistor, the ICC current consumption of the circuit, the IP current
consumption of the peripheral circuits and the load impedance.
On this receiving amplifier automatic gain control is used for line loss compensation.
Automatic gain control (pin AGC)
The UTC TEA1110A performs automatic line loss compensation. The automatic gain control varies both the
gain of the microphone amplifier and receiving amplifier in accordance with the DC line current within 5.9 dB (which
corresponds approximately to a line length of 5 km for a 0.5 mm diameter twisted-pair copper cable with a DC
resistance of 176Ω/km and an average attenuation of 1.2dB/km).
The IC can be used with different configurations of feeding bridge (supply voltage and bridge resistance) by the
means of connecting an external resistor RAGC between pins AGC and VEE. The line currents ISTART and ISTOP can
be increased by this resistor (the ratio between ISTART and ISTOP is not affected by the resistor). When pin AGC is in
the open-circuit condition, the AGC function is inactive.
Mute function (pin MUTE MUTE)
The mute function performs the switching between the speech mode and the dialling mode. When the MUTE
is in a low level, the DTMF input is active and the microphone and receiving amplifiers inputs are inactive. When the
MUTE is in a high level, the microphone and receiving amplifiers inputs are active while the DTMF input is inactive.
The input includes a pull-up resistor.
DTMF amplifier (pin DTMF)
When the DTMF amplifier is inactive, dialling tones that can be heard in the earpiece at a low level may be sent
on line. The UTC TEA1110A has an asymmetrical DTMF input. The input impedance between DTMF and VEE is
20kΩ. The automatic gain control has no effect on the DTMF amplifier.
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TEA1110A

LINEAR INTEGRATED CIRCUIT
FUNCTIONAL DESCRIPTION(Cont.)
SIDETONE SUPPRESSION
The UTC TEA1110A anti-side tone network consisting of RCC//Zline, Rast1, Rast2, Rast3, RSLPE and Zbal (see
Fig.6) suppresses the transmitted signal in the earpiece. Maximum compensation is obtained under the following
conditions:
RSLPE×Rast1=RCC× (Rast2+Rast3)
K=
(Rast 2 × (Rast3 + RSLPE ))
(Rast1× RSLPE )
Zbal= k×ZIine
The scale factor k is mainly for the compatibility with a standard capacitor from the E6 or E12 range for Zbal.
Zline varies considerably with the line type and the line length in practice. Therefore, the Zbal value should be
set to be an average line length which gives appropriate side tone suppression with short and long lines. The
suppression also depends on the accuracy of the match between Zbaland the impedance of the average line.
The receiving signal is to be attenuated 32dB by the anti-side tone network from the line before it enters the
receiving amplifier, and the attenuation is almost constant over the whole audio frequency range.
LN
R
t1
as
cc
R
Zline
IR
VEE
Im
PE
SL
R
as
t3
R
R
as
t2
Zir
SLPE
Zbal
Fig.6 Equivalent circuit of UTC TEA1110A anti-sidetone bridge
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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QW-R108-014.D
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