UNISONIC TECHNOLOGIES CO., LTD MC34018 LINEAR INTEGRATED CIRCUIT VOICE SWITCHED SPEAKER-PHONE CIRCUIT DESCRIPTION The UTC MC34018 speaker-phone integrated circuit includes all the active circuitry and control functions to implement a high quality hands-free telephone system. The circuit includes a microphone amplifier, a speaker amplifier, level detectors, a background sound level monitoring system in both the transmit and receive channels and an attenuation system which can control the transmit and receive levels as well as the background level. The applications include household and office speaker-phones, intercom systems, hand free kit for mobile phones, and others. FEATURES * Chip Select pin for Power conservation (active/standby mode). * Integrated all necessary active circuitry for a hand-free telephone into one single chip. * Operating under wide dynamic range through signal compression technology. * Build-In voltage regulators illuminate external regulators for lining operation. * Monitoring system for background noise level. * Background sound level compensation for transmit and receive levels as well as the background level. * Power audio amplifier for typical 100mW output (into 25Ω) with peak limiting for speaker to minimize distortion. * Volume control function for external volume control circuit. *Pb-free plating product number:MC34018L ORDERING INFORMATION Normal MC34018-D28-T MC34018-E28-T MC34018-R28-R MC34018-R28-T MC34018-S28-R MC34018-S28-T Order Number Lead Free Plating MC34018L-D28-T MC34018L-E28-T MC34018L-R28-R MC34018L-R28-T MC34018L-S28-R MC34018L-S28-T Package Packing DIP-28 SDIP-28 SSOP-28 SSOP-28 SOP-28 SOP-28 Tube Tube Tape Reel Tube Tape Reel Tube MC34018L-D28-T (1)Packing Type (2)Package Type (3)Lead Plating www.unisonic.com.tw Copyright © 2005 Unisonic Technologies Co., Ltd (1) R: Tape Reel, T: Tube (2) D28: DIP-28, E28: SDIP-28, S28: SOP-28, R28: SSOP-28 (3) L: Lead Free Plating, Blank: Pb/Sn 1 of 8 QW-R108-006,C MC34018 LINEAR INTEGRATED CIRCUIT PIN CONFIGURATION RR RTX TXI TXO TLI TLO RLI RLO MCI MCO CP1 CP2 XDI SKG 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 RRX 25 24 23 22 21 20 19 ACF 18 17 16 15 RXI RXO VLC XDC GND VB VCC SKI CS AGC V+ SKO PIN DESCRIPTION PIN NO. 1 2 3 PIN NAME DESCRIPTION RR A resistor to ground provides a reference current for the transmit and receive attenuators A resistor to ground determines the nominal gain of the transmit attenuator, the transmit RTX channel gain is inversely proportional to RTX resistance. Transmit Attenuator Input, Input resistance is nominally 5.0kΩ. TXI 4 TXO 5 TLI 6 TLO 7 RLI 8 RLO 9 MCI 10 MCO 11 CP1 12 CP2 13 XDI 14 SKG Transmit Attenuator Output, The TXO output signal drivers the input of transmit level detcetor, as well as the external circuit which drivers the telephone line. Transmit Level detector Input. An external resistor ac coupled to The TLI pin sets the detection level. Decreasing this resistor increases the sensitivity to transmit channel signals. Transmit Level detector Output. The external resistor and capacitor set the time the comparator will hold the system in the transmit mode after speech ceases. Receive Level detector Input. An external resistor ac coupled to The RLI pin sets the detection level. Decreasing this resistor increases the sensitivity to receive channel signals. Receive Level detector Output. The external resistor and capacitor set the time the comparator will hold the system in the receive mode after speech ceases. Microphone amplifier input. Input impedance is nominally 10kΩ and the dc bias voltage is approximately equal to VB Microphone amplifier output. The MIC amp gain is internally set at 34dB (50V/V). A parallel resistor and capacitor connected between this pin and VCC holds a voltage corresponding to the background noise level. The transmit detector compares the CP1 voltage with the speech signal from CP2. A capacitor at this pin peak detects the speech signals for comparison with the background noise level held at CP1. Input to the transmit detector system. The microphone amplifier output is ac coupled to the XDI pin through an external resistor. High current ground pin for the speaker amplifier output stage. The SKG voltage should be within 10mV of the ground voltage at pin 22. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 8 QW-R108-006,C MC34018 LINEAR INTEGRATED CIRCUIT PIN DESCRIPTION(Cont.) PIN NO. PIN NAME 15 SKO 16 V+ 17 AGC 18 19 CS SKI 20 VCC 21 VB 22 GND 23 XDC 24 VLC 25 ACF 26 RXO 27 RXI 28 RRX DESCRIPTION Speaker amplifier output. The SKO pin will source and sink up to 100mA when ac coupled to the speaker. The speaker amplifier gain is internally set at 34dB (50V/V). Input DC supply voltage. V+ can be powered from Tip and Ring if an ac decoupling inductor is used to prevent loading ac line signals. The required V+ voltage is 6.0V to 11V (7.5V nominal) at 7.0mA. A capacitor from this pin to VB stabilizes the speaker amplifier gain control loop, and additionally controls the attack and decay time of this circuit. The gain control loop limits the speaker amplifier input to prevent clipping at SKO. The internal resistance at AGC pin is nominally 110kΩ. Digital chip select input. When at a logic "0" (<0.7V) the VCC regulator is enabled. When at a logic "1" (>1.6V),the chip is in the standby mode drawing 0.5mA.An open CS pin is a logic "0".Input impedance is nominally 140k ohms. The input voltage should not exceed 11V. Input to the speaker amplifier. Input impedance is nominally 20kΩ. A 5.4V regulated output which powers all circuits except the speaker amplifier output stage. VCC can be used to power external circuitry such as a microprocessor(3.0mA max.) A filter capacitor is required. The UTC MC34018 can be powered by a separate regulated supply by connecting V+ and VCC to a voltage between 4.5V and 6.5V while maintaining CS at a logic "1". An output voltage equal to approximately VCC/2 which series as an analog ground for the speakerphone system. Up to 1.5mA of external load current may be sourced from VB. Output impedance is 250 ohms. A filter capacitor is required. Ground pin for the IC(except the speaker amplifier) Transmit detector output. A resistor and capacitor at his pin hold the system in the transmit mode during pauses between words or phrases. When the XDC pin voltage decays to ground, the attenuators switch from the transmit mode to idle mode. The internal resistor at XDC is nominally 2.6k ohms(see Fig.1). Volume control input>connecting this pin to the slider of a variable resistor provides receive mode volume control. The VLC pin voltage should be less than or equal to VB. Attenuator control filter. A capacitor connected to this pin reduces noise transient as the attenuator control switches level of attenuation. Receive attenuator Output. Normally this pin is ac coupled to the input of the speaker amplifier. Receive attenuator Input. Input impedance is nominally is 5.0kΩ. A resistor to ground determines the nominal gain of the receive attenuator. The receive channel gain is directly proportional to the RRX resistance. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 8 QW-R108-006,C MC34018 BLOCK DIAGRAM Speaker LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 8 QW-R108-006,C MC34018 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS (Ta=25℃, Voltage referred to pin 22.) PARAMETER SYMBOL RATINGS UNIT V+ terminal Voltage (pin 16) +12, -1.0 V CS (pin 18) +12, -1.0 V Speaker amplifier Ground(pin 14) +3.0, -1.0 V VLC(pin 24) +VCC, -1.0 V Storage temperature TSTG -65 ~ +150 °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. RECOMMENDED OPERATION CONDITIONS PARAMETER V+ Terminal Voltage (pin 16) CS (pin 18) VLC (pin 24) Receive Signal(pin 27) Microphone Signal(pin 9) Speaker Amplifier Ground (pin 14) ICC (pin 20) Ambient Temperature SYMBOL TA UNIT V V V mVrms mVrms mVdc mA °C TYP CHANGE -0.2 -0.4 +0.1 ±0.003 ±0.24 ±0.001 ±0.4 +0.4 ±0.2 UNIT %/°C %/°C %/°C dB/°C %/°C dB/°C dB/°C %/°C nA/°C TEMPERATURE CHARACTERISTICS (-20 ~+60℃) PARAMETER V+ Supply Current ( V+ 11V,Pin 18 = 0.7V ) V+ Supply Current(V+ 11V,Pin 18 = 1.6V ) VCC Voltage( V+ = 7.5V ) Attenuator Gain ( Max and Min Setting ) Delta RXO,TXO Voltage Speaker AMP Gain Microphone AMP Gain Microphone Amp Input Resistance Tx-Rx Switching Threshold (20μA) RATINGS +6.0 ~ +11 0 ~ +11 0.55VB ~ VB 0 ~ 250 0 ~ 5.0 -10 ~ +10 0 ~ 3.0 -20 ~ +60 PIN 16 16 20 4,26 15,19 9,10 9 5,7 ELECTRICAL CHARACTERISTICS (Referred to Fig.1) PARAMETER SUPPLY VOLTAGES VCC Voltage Line Regulation Dropout Voltage VB Voltage SYMBOL VCC ΔVCCLN VD VB V+ Supply Current IV+ Output Resistance ROUT ROUT Output Resistance ATTENUATORS Receive Attenuator Gain (1.0kHz) Rx Mode, Pin 24= VB Pin 27 = 250Mvrms Range (Rx to Tx Modes) Idle Mode, Pin 27= 250mVrms TEST CONDITIONS V+=7.5V 6.5V<V+<11V V+=5.0V V+=7.5V V+=11V,Pin 18=0.7V TYP MAX UNIT 4.9 5.4 65 80 2.9 5.9 150 300 3.3 9.0 Vdc mV mV Vdc mA 800 20 μA Ω 2.5 V+=11V,Pin 18=1.6V ICC=3mA 6.0 IB=1.7mA 250 Ω GRX 2.0 6.0 10 dB ΔGRX 40 44 48 dB GRI -20 -16 -12 dB UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN 5 of 8 QW-R108-006,C MC34018 LINEAR INTEGRATED CIRCUIT ELECTRICAL CHARACTERISTICS (Cont.) PARAMETER RXO Voltage (Rx Mode) Delta RXO Voltage (Switch from Rx to Tx Mode) RXO Sink Current (Rx mode) RXO Source Current (Rx mode) RXI Input Resistance SYMBOL VRXO Volume Control Range ACF Voltage (VCC-Pin 25 Voltage) IRXOL IROXH RRXI Leakage Current Rx Attenuator Gain, Rx Mode, 0.6VB<Pin 24<VB 24.5 1.8 2.3 Rx Mode Tx Mode Idle Mode UNIT mV 100 mV 3.0 8.0 μA mA kΩ 32.5 dB 3.2 Vdc 100 mV 8.0 48 mV mV mV dB dB -8.5 dB GTX ΔGTX 4.0 40 GTXI -16.5 -13 ISINK 75 1.0 3.5 5.0 3.0 8.0 μA mA kΩ 33 15 2.4 34 22 3.0 35 37 3.6 dB kΩ Vdc ISOURCE RIN GSPK RIN VO(SKO) VSKOH Low VSKOL GMCI Pin 19 = 20mVrms Pin 19 =Cap couple to GND Pin 19 = 0.1V, -100mA Load at Pin 15 Pin 19=0.1V +100mA Load at Pin 15 Pin 9 = 10mVrms,1KHz RMCI ILEAK Pin 8 = VB+1.0V Pin 6 = VB+1.0V Ratio of ITLI to IRLI - at 20μA -to Switch Tx-Rx Comparator) Transmit-Receive Switching ITH Threshold TRANSMIT DETECTOR Idle Mode XDC Voltage VXDC Tx Mode CP2 Current Source ICP2 Distortion Rx Mode, RXI to SKO RXD Pin 27 = 10mVrms,1KHz Tx Mode, MCI to TXO TXD Pin 9 = 5mVrms,1KHz Note 1: V+=7.5V, CS =0.7V except where noted. Note 2: Rx mode: Pin7=-100μA,Pin5=+100μA, except where noted. Tx mode: Pin 5,13=-100μA, pin 7=+100μA, Pin 11=0V. Idle mode: Pin 5=-100μA, pin 7, 13=+100μA. Note 3: Current into a pin designed as +, current out of a pin designed Note 4: Voltage referred to pin 22, Ta=25°C. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5.0 MAX 3.2 150 6.0 75 6.0 44 High RLO TLO TYP 2.3 ΔVTXO SKO Voltage MICROPHONE AMPLIFIER Microphone Amp Gain Microphone Amp Input Resistance LOGAMPS 75 1.0 3.5 VTXO ΔVACF Transmit Attenuator Gain(1.0kHz) Tx Mode, Pin 3 = 250mVrms Range, (Tx to Rx Mode) Idle Mode, Pin 3 = 250Mvrms TXO Sink Current (Tx mode) TXO Source Current (Tx mode) TXO Input Resistance SPEAKER AMPLIFIER Speaker Amp Gain SKI Input Resistance SKO Voltage MIN 1.8 ΔVRXO VCR ATTENUATORS TXO Voltage (Tx mode) Delta TXO Voltage (switch from Tc to Rx Mode) TEST CONDITIONS 5.5 Vdc 600 mV 32.5 34 35 dB 6.5 10 16 kΩ 2.0 2.0 μA μA 0.8 5.0 1.2 0 4.0 10 1.5 2.0 13 Vdc Vdc μA % % 6 of 8 QW-R108-006,C MC34018 LINEAR INTEGRATED CIRCUIT TEST CIRCUIT TRANSMIT OUTPUT DC line input 0.068 F 4.7k 10 VB MIC 10k 0.05 F 9 0.1 F 2k 12k 13 MCO 12 XDI 11 CP2 23 CP1 18 XDC 59k 16 CS V+ Vcc transmit detector comp VCC regulator 2.6k MCI Receive input 1000 F 200k 47 F 47 F 4.7 F 100k Vcc 5.4V MIC AMP VB 3.3k 5 VB TLO GND VB AGC peak limiter Vcc RTI 1.0 F 17 Vcc RECEIVE/TRANSMIT COMP 7 22 56k Attenuator control TRANSMIT LOG AMP 2.2M 1.0 F 33k 500 0.068 F 6 Vth (36mV) VB TLI 47 F 20 transmit attenuator Speaker amp receive attenuator 500 VB regulator 4.7k VB RECEIVE AMP RLO 0.068 F VB 8 VLC ACF 21 24 25 TXI 3 RTX RR 2 1 TXO 4 RXI RRX 27 28 RXO 26 SKI SKG 19 14 4.7 F Vcc 30k 0.1 F 24k 2.2M 91k 20k 47 F 1.0 F 18k 0.1 F 47 F 4.3k 0.01 F SKO 15 VB 0.05 F 25 Fig 1 Test circuit BASIC LINE POWERED SPEAKERPHONE 470k 470k F F 1.0 0.068 0.1 0.068 mF F F 4.7 F 0.068 22k 47k F 1000 15k 8.2k F 0.068 2.2k F 10 33k 47k 8.2k F F 1.0 1.0 0.01 F F 0.05 F 0.05 8.2k 0.01 F 0.01 F 0.01 F Fig 2 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 8 QW-R108-006,C MC34018 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. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 8 of 8 QW-R108-006,C