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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 (64k) for dynamic, magnetic or piezo-electric microphones *Asymmetrical high impedance input (32k) 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+ MICAGC
UTC
UNISONIC TECHNOLOGIES CO., LTD.
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QW-R108-014,A
UTC TEA1110A
PIN DESCRIPTION
SYMBOL
LN SLPE REG n.c. DTMF MUTE IR AGC MICMIC+ 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 MICMIC+ VEE 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: m
UTC
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UTC TEA1110A
PARAMETER
LINEAR INTEGRATED CIRCUIT
SYMBOL
VLN Vn (max) IIine Ptot Tstg Ta Tj
ABSOLUTE MAXIMUM RATINGS
RATINGS
VEE-0.4 ~ 12 VEE-0.4 ~ 13.2 VEE -0.4 ~VCC+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 (RSLPE=20) Total power dissipation (Ta=75) DIP-14 SOP-14 Storage temperature Ambient temperature Maximum Junction temperature
ELECTRIC CHARACTERISTICS
(Iline=15mA, VEE=0V, RSLPE=20, AGC pin connected to VEE, Zline=600, 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 Vref LN and SLPE DC line voltage VLN
Iline = 1 mA Iline = 4 mA Iline = 15 mA Iline = 140 mA RVA(SLPE-REG) = 27k 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
VLN(exR)
VLN(T) ICC
Ta = -25 to +75 C
30
mV
VCC = 2.9 V Ip=0mA Ip=0.5mA
1.1 2.9 550
1.4
mA V
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 Gvtx(f) referred to 1 kHz Gain variation with temperature Gvtx(T) referred to 25 Common mode rejection ratio CMRR Maximum sending signal(RMS VLN(max) value)
(rms)
620
VMIC = 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 Vnotx 200 Receiving amplifier (pins IR, QR and GAR) Voltage gain from IR to QR Gvrx
VIR = 4 mV (RMS)
32
33
34
dB
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UNISONIC TECHNOLOGIES CO., LTD.
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UTC TEA1110A
PARAMETER
Gain variation with frequency referred to kHz Gain variation with temperature referred to25C 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) Gvrxr Ta = -25 to +75 C
external resistor connected between GAR and QR IP = 0 mA sine wave drive, RL = 150, THD = 2% Vo(rms) IP = 0 mA sine wave drive, RL = 450 , THD = 2% Gvrx = 33 dB, IR Vnorx(rms) open-circuit, RL = 150
Gvtrx Istart Istop Gvdtmf
Iline = 85 mA
5.9 23 56
dB mA mA 26.5 dB dB dB dB VEE +0.3 VCC +0.4 V V A dB
Gain variation with frequency Gvdtmf(f) referred to 1kHz Gain variation with temperature Gvdtmf(T) Ta = -25 to +75 C referred to25C Voltage gain from DTMF to QR VDTMF = 20 mV (RMS), Gvct (confidence tone) RL = 150 Mute function (pin MUTE) LOW level input voltage VIL HIGH level input voltage VIH Input current IMUTE Gain reduction for microphone and MUTE = LOW Gvtrxm receiving amplifiers
VDTMF = 20 mV (RMS), MUTE = LOW f = 300 to 3400 Hz
24.1
25.3 0.2 0.4 -15
VEE - 0.4 VEE +1.5 1.5 80
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UNISONIC TECHNOLOGIES CO., LTD.
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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 10 4x BAS11 +
Rast1 130k
CIR
IR QR
LN
Rcc 619 Vcc DTMF Rpd4
signal from dial and control circuits CVCC 100F BC558
telephone line
Rast2 100pF 3.92k CGARS Rast3 390 Zbal
CGAR
GAR MIC+
UTC TEA1110A
Rpd5 470k
1nF
b/a
BZX79C10
MICSLPE REG RSLPE 20 +
MUTE AGC VEE
470k +
supply for peripheral circuits
Rpd6 BC547 68k
BF473 CREG 4.7F
PD input
Rpd1 BSN254 BC547 Rlimit 3.9 470k BZX79C10 Rpd2 470k Rpd3 1M
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 (RVA). Vref equals 3.35 V and can be increased by connecting RVA 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 CREG, which is connected to VEE. This 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). The voltage at pin SLPE is proportional to the line current. The voltage at pin LN is: VLN=Vref +RSLPExISLPE 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. The preferred value for RSLPE is 20 . Changing RSLPE 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.
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UTC TEA1110A
Rline lline LN 1
LINEAR INTEGRATED CIRCUIT
Rcc 619 Vcc 14 from pre amp Ip Icc + UTC TEA1110A 3 + REG CREG 4.7F 11 VEE
Peripheral circuits
Rexch
Ish
I* + Vd 2 SLPE RSLPE 20 +
+
CVCC 100F
Vexch
ISLPE
Fig. 1 Supply configuration.
6.0
5.0 Vref (V) 4.0 (1) (2) 3.0 104 105 RVA
()
(1) Influence of RVA on Vref. (2) Vref without influence of RVA Fig.2 Reference voltage adjustment by RVA 106 10 7
The internal circuitry of the UTC TEA1110A is supplied from pin VCC. This voltage supply is derived from the line voltage by means of a resistor (RCC) and must be decoupled by a capacitor CVCC. It may also be used to supply peripheral circuits such as dialling or control circuits. The VCC voltage depends on the current consumed by the IC and the peripheral circuits as shown by the formula: Vcc=Vcc0-Rccintx(Ip-Irec) Vcc0=VLN-RccxICC (see also Figs 3 and 4). RCCint is the internal equivalent resistance of the voltage supply, and Irec is the current consumed by the output stage of the earpiece amplifier. 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). With line currents below 7.5 mA, the internal reference voltage (generating Vref) is automatically adjusted to a lower value. This means that more sets can operate in parallel with DC line voltages (excluding the polarity guard) down to an absolute minimum voltage of 1.6 V. At currents below 7.5 mA, the circuit has limited sending and receiving levels. This is called the low voltage area.
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UTC TEA1110A
2.5 2
LINEAR INTEGRATED CIRCUIT
Rccint 1.5 + Vcco
Vcc
Ip (mA)
Irec
PERIPHERAL CIRCUIT
Ip
1 VEE 0.5 (2) (1) With RVA resistor. (2) Without RVA resistorl 1 2 Vcc (V) 3 4 (1) Fig.4 Vcc supply voltage for peripherals
0 0
Fig.3 Typical current Ip available from Vcc for peripheral circuits at IIine=15mA.
Set impedance
In the audio frequency range, the dynamic impedance is mainly determined by the RCC resistor. The equivalent impedance of the circuit is illustrated in Fig.5.
LN LEQ Vref SLPE + RSLPE VEE
20
Rp
Rcc 619
REG CREG 4.7F +
Vcc Cvcc 100F
LEQ=CREG x RSLPE x Rp Rp=internal resistance Rp=15.5k 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 pins MIC+ and MICis 64 k ( 2 x 32 k). Automatic gain control is provided on this amplifier 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 20 k. The voltage gain from pin IR to pin QR can be decreased by connecting an external resistor RGAR between pins GAR and QR; the adjustment range is 14 dB. Two external capacitors CGAR (connected between 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 x(RGARint // RGAR). RGARint is the internal resistor (connected between pins GAR and QR) which sets the gain with a typical value of 125 kW. The condition CGARS = 10 xCGAR must be fulfilled to ensure stability. The output voltage of the receiving amplifier is specified for continuous wave drive. 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.
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UTC TEA1110A
Automatic gain control (pin AGC)
LINEAR INTEGRATED CIRCUIT
Automatic gain control is provided on this amplifier for line loss compensation.
The UTC TEA1110A performs automatic line loss compensation. The automatic gain control varies the gain of the microphone amplifier and the gain of the receiving amplifier in accordance with the DC line current. The control range is 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 176 /km and an average attenuation of 1.2 dB/km). The IC can be used with different configurations of feeding bridge (supply voltage and bridge resistance) by connecting an external resistor RAGC between pins AGC and VEE. This resistor enables the Istart and Istop line currents to be increased (the ratio between Istart and Istop is not affected by the resistor). The AGC function is disabled when pin AGC is left open-circuit. Mute function (pin MUTE) The mute function performs the switching between the speech mode and the dialling mode. When MUTE is LOW, the DTMF input is enabled and the microphone and receiving amplifiers inputs are disabled. When MUTE is HIGH, the microphone and receiving amplifiers inputs are enabled while the DTMF input is disabled. A pull-up resistor is included at the input. DTMF amplifier (pin DTMF) When the DTMF amplifier is enabled, dialling tones may be sent on line. These tones can be heard in the earpiece at a low level (confidence tone). The UTC TEA1110A has an asymmetrical DTMF input. The input impedance between DTMF and VEE is 20 k. The automatic gain control has no effect on the DTMF amplifier.
SIDETONE SUPPRESSION
The UTC TEA1110A anti-sidetone network comprising RCC//Zline, Rast1, Rast2, Rast3, RSLPE and Zbal (see Fig.6 ) suppresses the transmitted signal in the earpiece. Maximum compensation is obtained when the following conditions are fulfilled: RSLPExRast1=Rccx(Rast2+Rast3) (Rast2x(Rast3+RSLPE)) K= (Rast1xRSLPE) Zbal= kxZIine The scale factor k is chosen to meet the compatibility with a standard capacitor from the E6 or E12 range for Zbal. In practice, Zline varies considerably with the line type and the line length. Therefore, the value of Zbal should be for an average line length which gives satisfactory sidetone 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 anti-sidetone network for the UTC TEA1110A (as shown in Application information circuit) attenuates the receiving signal from the line by 32 dB before it enters the receiving amplifier. The attenuation is almost constant over the whole audio frequency range.
LN
t1 as R R cc
Zline VEE
IR Im
R as t2 R
Zir
R as t3
Fig.6 Equivalent circuit of UTC TEA1110A anti-sidetone bridge
UTC
P SL E
SLPE
Zbal
UNISONIC TECHNOLOGIES CO., LTD.
8
QW-R108-014,A
UTC TEA1110A
LINEAR INTEGRATED CIRCUIT
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.
UTC
UNISONIC TECHNOLOGIES CO., LTD.
9
QW-R108-014,A

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