LOW VOLTAGE VERSATILE TELEPHONE TRANSMISSION TELEPHONE TRANSMISSION INTERFACE

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 APPLICATIONS *Asymmetrical high impedance input (32kΩ) for electric *Line powered telephone sets, cordless microphones telephones, fax machines, answering machines. *DTMF input with confidence tone *MUTE input for pulse or DTMF dialling www.DataSheet4U.com *Receiving amplifier for dynamic, magnetic or piezo-electric earpieces *AGC line loss compensation for microphone and earpiece amplifiers. 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. 1 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: μ m UTC UNISONIC TECHNOLOGIES CO., LTD. 2 QW-R108-014,A 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=20Ω) Total power dissipation (Ta=75℃) DIP-14 SOP-14 Storage temperature Ambient temperature Maximum Junction temperature ELECTRIC CHARACTERISTICS (Iline=15mA, VEE=0V, RSLPE=20Ω, AGC pin connected to VEE, Zline=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 Vref LN and SLPE DC line voltage VLN Iline = 1 mA Iline = 4 mA Iline = 15 mA Iline = 140 mA RVA(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 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 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 ∆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 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) ∆Gvrxr Vo(rms) Ta = -25 to +75 °C external resistor connected between GAR and QR IP = 0 mA sine wave drive, RL = 150Ω, THD = 2% IP = 0 mA sine wave drive, RL = 450 Ω, THD = 2% Gvrx = 33 dB, IR open-circuit, RL = 150 Ω Vnorx(rms) ∆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 μA dB Gain variation with frequency ∆Gvdtmf(f) referred to 1kHz Gain variation with temperature ∆Gvdtmf(T) referred to25°C Voltage gain from DTMF to QR Gvct (confidence tone) Mute function (pin MUTE) LOW level input voltage VIL HIGH level input voltage VIH Input current IMUTE Gain reduction for microphone and ∆Gvtrxm receiving amplifiers VDTMF = 20 mV (RMS), MUTE = LOW f = 300 to 3400 Hz Ta = -25 to +75 °C VDTMF = 20 mV (RMS), RL = 150 Ω 24.1 25.3 ±0.2 ±0.4 -15 VEE - 0.4 VEE +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 CIR IR QR LN Rcc 619Ω Vcc DTMF Rpd4 signal from dial and control circuits CVCC 100μF BC558 telephone line Rast2 100pF 3.92kΩ CGARS Rast3 390Ω Zbal CGAR GAR MIC+ UTC TEA1110A Rpd5 470kΩ 1nF b/a BZX79C10 MICSLPE REG RSLPE 20Ω + MUTE AGC VEE 470kΩ + supply for peripheral circuits Rpd6 BC547 68kΩ BF473 CREG 4.7μF PD input Rpd1 BSN254 BC547 Rlimit 3.9Ω 470kΩ BZX79C10 Rpd2 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 (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 +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. The preferred value for RSLPE is 20 Ω. 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. UTC UNISONIC TECHNOLOGIES CO., LTD. 5 QW-R108-014,A UTC TEA1110A Rline lline LN 1 LINEAR INTEGRATED CIRCUIT Rcc 619Ω Vcc 14 from pre amp Ip Icc + UTC TEA1110A 3 + REG CREG 4.7μF 11 VEE Peripheral circuits Rexch I sh I* + Vd 2 SLPE RSLPE 20Ω + + CVCC 100μF Vexch I SLPE Fig. 1 Supply configuration. 6.0 5.0 Vref (V) 4.0 (1) (2) 3.0 104 105 RVA (Ω) (1) Influence of RVA on Vref. (2) Vref without influence of RVA Fig.2 Reference voltage adjustment by R VA 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-Rccint×(Ip-Irec) Vcc0=VLN-Rcc×ICC (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. UTC UNISONIC TECHNOLOGIES CO., LTD. 6 QW-R108-014,A 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. Se