Document
TECHNICAL DATA
LINEAR INTEGRATED CIRCUIT
VOICE SWITCHED SPEAKER PHONE CIRCUIT DESCRIPTION
The IL34018 speaker-phone integrated circuit incorporates the necessary functions to produce a high quality hands-free speaker-phone system. The applications include household and office speaker-phones, intercom systems, hand free kit for mobile phones, and others
IL34018
FEATURES
• All necessary level detection and attenuation controls for a hand-free telephone included. • Background noise level monitoring with long time constant. • Background sound level compensation for transmit and receive levels as well as the background level. • Wide operating dynamic range through signal compression. • On-chip voltage regulators illuminate external regulators for lining operation. • Power audio amplifier for typical 100mW output (into 25 ohms)with peak limiting for speaker to minimize distortion. • Chip Select pin for active/stand by operation. • Volume control function for external volume control. • Standard 28-pin plastic DIP and SOP package.
ORDERING INFORMATION IL34018N Plastic IL34018DW SOIC TA = -25° to 85° C for all packages
ABSOLUTE MAXIMUM RATINGS (Ta=25℃,Voltages referred to pin 22) PARAMETER V+ terminal Voltage (pin 16) CS (pin 18) Speaker amplifier Ground(pin 14) VLC(pin 24) Storage temperature
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VALUE -1.0 to +12 -1.0 to +12 -1.0 to +3.0 -1.0 to +Vcc -65 to +150 UNIT V V V V ℃
RECOMMENDED OPERATION CONDITIONS PARAMETER V+ Terminal Voltage (pin 16) CS (pin 18) Vcc (pin 20) VLC(pin 24) Receive Signal(pin 27) Microphone Signal(pin 9) Speaker Amplifier Ground (pin 14) Ambient Temperature VALUE +6.0 to +11 0 to +11 0 to 3.0 0.55VB to VB 0 to 250 0 to 5.0 -10 to +10 -25 to +85 UNIT V V mA V mVrms mVrms mVdc ℃
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IL34018
Internal Block Diagram
MIC
MIC AMP TRANSMIT CHANNEL TRANSMIT ATTENUATOR TRANSMIT LEVEL DETECTOR TRANSMIT OUTPUT
SIGNAL/NOISE DETECTOR
ATTENUATOR CONTROL
TRANSMIT/ RECEIVE COMPARATOR SIDE TONE
SIDE TONE
RECEIVE LEVEL DETECTOR PEAK LIMITER
SPEAKE R AMP RECEIVE CHANNEL
SPE AKE R
RECEIVE ATTENUATOR RECEIVE INPUT VCC REGULATOR DC INPUT TELEPHONE LINE
Contek
ENABLE INPUT RECEIVE VOLUME CONTROL
S1 T 220kΩ 68kΩ 4.7kΩ 2.7kΩ
1000μF
0.01μF
0.05μF
Hook Switch R
0.01μF
8.2kΩ
47kΩ
47kΩ 8.2kΩ
6.8kΩ
470kΩ
0.1μF 470kΩ 2.2kΩ 33kΩ
10μF
0.068μF 15kΩ
4700pF 4700pF
470kΩ 47kΩ 22kΩ
8.2kΩ
47kΩ
0.01μF
0.01μF
Vcc 3.3kΩ 100kΩ 0.068μF 0.068μF VB 0.1μF S2 0.1μF 9 47μF 15 Speaker 14 SKG VLC 24 VB 20kΩ Volume Control 47μF 24kΩ 47μF 91kΩ 30kΩ 18kΩ 0.01μF VB 21 Vcc 20 RTX 2 RR 1 RRX 28 4.3kΩ RXO 26 0.05μF SKI 19 CP2 12 XDC 23 200kΩ 4.7μF 4.7μF TLO 6 2.2MΩ 1.0μF RLO 8 2.2MΩ 1.0μF GND 22 SKO 3 Τ XΙ MCI 10 ΜCΟ 4.7kΩ 13 XDΙ 47μF 4.7μF 1.0μF 0.068μF 3.3kΩ
MIC 2kΩ
0.05μF
4 TXO
5 TLI
11 CP1
25 ACF
17 AGC
16 V+
18 CS
7 RLI
0.1μF 27 RXI
Fig 1 - Basic Line powered Speakerphone
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IL34018
PIN CONFIGURATIONS
PIN NAME 1 RR 2 RTX 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 TXI TXO TLI TLO RLI RLO MCI MCO CP1 CP2 XDI SKG SKO V+ AGC DESCRIPTION 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 channe inversely proportional to RTX resistance. Input to the transmit attenuator. Input resistance is nominally 5.0k ohms. Output of the transmit attenuator. The TXO output signal drivers the input of transmit level detce as the external circuit which drivers the telephone line. Input of the transmit level detector. An external resistor ac coupled to The TLI pin sets the detec Decreasing this resistor increases the sensitivity to transmit channel signals. Output of the transmit level detector. The external resistor and capacitor set the time the compa hold the system in the transmit mode after speech ceases. Input of the receive level detector. An external resistor ac coupled to The RLI pin sets the detec Decreasing this resistor increases the sensitivity to receive channel signals Output of the receive level detector. The external resistor and capacitor set the time the compar hold the system in the receive mode after speech ceases Microphone amplifier input. Input impedance is nominally 10k ohms 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 correspon to the background noise level. The transmit detector compares the CP1 voltage with the speech s CP2. A capacitor at this pin peak detects the speech signals for comparison with the background noise at CP1. Input to the transmit detector system. The microphone amplifier output is ac coupled to the XD through an external resistor High current ground pin for the speaker amplifier output stage. The SKG voltage should be wit 10mV of the ground voltage at pin 22 Speaker amplifier output. The SKO pin will source and sink up to 100mA when ac cou.