MC34018G-S28-R

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.  ORDERING INFORMATION Order Number Lead Free MC34018L-E28-T - Halogen Free MC34018G-D28-T MC34018G-E28-T MC34018G-R28-T MC34018G-R28-R MC34018G-S28-T MC34018G-S28-R www.unisonic.com.tw Copyright © 2014 Unisonic Technologies Co., Ltd Package Packing DIP-28 SDIP-28 SSOP-28 SSOP-28 SOP-28 SOP-28 Tube Tube Tube Tape Reel Tube Tape Reel 1 of 8 QW-R108-006.E MC34018  LINEAR INTEGRATED CIRCUIT MARKING PACKAGE MARKING SOP-28 SSOP-28 DIP-28 SDIP-28  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 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 28 27 26 25 24 23 22 21 20 19 18 17 16 15 RRX RXI RXO ACF VLC XDC GND VB VCC SKI CS AGC V+ SKO 2 of 8 QW-R108-006.E MC34018 LINEAR INTEGRATED CIRCUIT PIN DESCRIPTION  PIN NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 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. TXI Transmit Attenuator Input, Input resistance is nominally 5.0kΩ. Transmit Attenuator Output, The TXO output signal drivers the input of transmit level TXO 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 TLI 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 TLO 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 RLI 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 RLO 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 MCI approximately equal to VB MCO 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 CP1 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 CP2 noise level held at CP1. Input to the transmit detector system. The microphone amplifier output is ac coupled to the XDI XDI pin through an external resistor. High current ground pin for the speaker amplifier output stage. The SKG voltage should be SKG within 10mV of the ground voltage at pin 22. Speaker amplifier output. The SKO pin will source and sink up to 100mA when ac coupled SKO 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 V+ 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 AGC 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" (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. CS SKI 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 VCC 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 VB 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. GND Ground pin for the IC(except the speaker amplifier) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 8 QW-R108-006.E MC34018  PIN DESCRIPTION(Cont.) PIN NO. PIN NAME 23 XDC 24 VLC 25 ACF 26 RXO 27 RXI 28 RRX DESCRIPTION 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. BLOCK DIAGRAM Speaker  LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 8 QW-R108-006.E MC34018  LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS (TA=25C, 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C) 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 (20A)  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 VCCLN 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