UNISONIC TECHNOLOGIES CO., LTD MC34118
LINEAR INTEGRATED CIRCUIT
VOICE SWITCHED SPEAKER-PHONE CIRCUIT DESCRIPTION As a voice switched speaker-phon
e integrated circuit, the UTC MC34118 includes the necessary amplifiers, attenuators, level detectors and control algorithm. To form the UTC MC34118’s internal circuit, there is an internal microphone amplifier with adjustable gain and mute control, internal transmit and Receive attenuators (operate in a complementary manner), level detectors at both input and output of both attenuators, and background noise monitors for both the transmit and receive channels. The dial tone can be pretended from being attenuated by the receive background noise monitor circuit by a dial tone detector. There are also two line driver amplifiers which can be used to form a hybrid network in conjunction with an external coupling transformer. A high-pass filter can be used for other filtering functions, and especially to filter out 60Hz noise in the receive channel. The UTC MC34118 which requiring typically 5mA may be operated from a power supply, or it can be powered from the telephone line. FEATURES * Attenuator gain range: 52dB (between Transmit and Receive) * For line-powered applications : 3~6.5V low voltage operation * For improved sensitivity :4-point signal sensing * For Transmit and Receive paths: background noise monitors * External resistors set microphone amplifier gain * Mute function included * Chip disable: active or standby operation * During dial tone presence: dial tone detector to inhibit receive idle mode Lead-free: MC34118L Halogen-free: MC34118G
ORDERING INFORMATION
Ordering Number Normal Lead Free Plating Halogen Free
Package Packing MC34118-D28-T MC34118L-D28-T MC34118G-D28-T DIP-28 Tube MC34118-E28-T MC34118L-E28-T MC34118G-E28-T SDIP-28 Tube MC34118-S28-T MC34118L-S28-T MC34118G-S28-T SOP-28 Tube MC34118-S28-R MC34118L-S28-R MC34118G-S28-R SOP-28 Tape Reel
PIN DESCRIPTION PIN NO
PIN NAME DESCRIPTION 1
FO Output of filter. The output impedance is less than 50Ω. 2 FI Input of filter. The input impedance is less than 1M Ω.
3 CD Chip Disable input .A logic low (voltage lower than 0.8V) sets normal operation. A logic
high (voltage higher than 2V) disable the IC. This pin’s input impedance is 90 K Ω
nominally.
4 V CC
This pin requires a supply voltage of +2.8V ~ +6.5V at 5mA. After V CC falls from 3.5V ~金牌班长
2.8V, when in the receive mode, an AGC circuit reduces the receive attenuator gain by 25dB.
5 HTO+ The output of the second hybrid amplifier. This amplifier’s gain is internally set at -1.
6 HTO- Output of the first hybrid amplifier. This amplifier’s gain of the amplifier is set by external resistors.
7 HTI The first hybrid amplifier’s input and summing node. DC level is about equal to VB. 8 TXO The transmit attenuator’s output. DC level is about VB.
9 TXI The transmit attenuator’s input. It’s maximum signal level is 350 mVrms. The input impedance is 10K Ω.
10 MCO The microphone amplifier’s output. This amplifier’s gain is set by external resistors. 11 MCI The summing node of the microphone’s input. DC lever is VB.
12 MUT Input of mute. A logic low (voltage lower than 0.8V) sets the circuit normal operation. A
logic high (voltage higher than 2V) mutes the microphone amplifier, but it doesn’t affect
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the rest of the circuit. The input impedance is 90 K ohms.
13 VLC The input of Volume control. In the receive mode, when VLC=VB, the receive
attenuator is at maximum gain. The receive gain is down 35dB when VLC=0.3dB, and
kh550it does not effect the transmit modes.
14 CT At this pin, to switch modes, the RC sets the response time for the circuit.
15 VB In this pin, there’s an output voltage=Vcc/2 which is a system AC ground and biases the volume control. What required is a filter capacitor.
16 CPT The time constant for the transmit background side can be set by the RC at this pin . 17 TLI2
The input to the transmit level detector which is on the microphone/ speaker side.
18 TLO2 The output to the transmit level detector which is on the microphone/ speaker side. Also the input to the transmit background monitor.
19 RLO2 The Output of the receive level detector which is on the microphone/ speaker side 20 RLI2 The input to the receive level detector which is on the microphone/ speaker side
21 RXI The input to the receive attenuator and dial tone detector. In this pin, the maximum input level is 350mVrms,and the input impedance is 10K Ω.
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22 RXO The output of the receive attenuator. This pin’s DC level is VB.
23 TLI1 The input to the transmit level detector which is on the line side.
24 TLO1 The output to the transmit level detector which is on the line side, and also the input to the transmit background monitor.
25 RLO1 The output of the receive level detector which is on the line side.
26 RLI1 The input to the receive level detector which is on the line side.
27 CPR The time constant for the receive background monitor can be set by the RC at this pin. 28 GND Ground.
BLOCK DIAGRAM
V CC CD
GND VB
RLO2
TLO2
CPT MCI CPR FO TOL1RLO1
FI RLI1RXI RXO VLC RLI2
ABSOLUTE MAXIMUM RATING (Ta=25°С,Voltages referred to pin 22)
PARAMETER SYMBOL RATINGS UNIT Supply Voltage V CC -1~7 V Voltage at Pin 3 V3 -1~V CC +1 V Voltage at Pin 12 ( mute) V12 -1~V CC +1 V Voltage at Pin 13 ( VLC) V13 -1~V CC +0.5 V Voltage at Pin 9, Pin 21, and Pin 2 V9, 21, 2 -0.5~ V CC +0.5 V Storage Temperature T STR -65~+150 °С 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 SYMBOL RATINGS UNIT Supply Voltage V4 3.5~6.5 V Voltage at Pin 3 V3 0~ V CC V Voltage at Pin 12 ( MUTE) V12 0~ V CC V
Voltage at Pin 13 ( VLC) V13 0.3×VB~VB V
IVB Current ( Pin 15) I VB 500 µA Attenuator Input Signal Voltage at Pin 9, Pin 21 V9, V21 350 mVrms
雪帆RXO, TXO(Pin8, Pin 22) 0~+-2 mA
MCO(Pin 10) 0~+-1 mA
Load Current HTO-, HTO+(Pin 6, Pin5) 0~+-0.5 mA
Ambient Operating Temperature T OPR -20~+60 °С ELECTRICAL CHARACTERISTICS (Ta=25°C) PARAMETER SYMBOL
TEST CONDITIONS MIN TYP MAX UNIT Supply Voltages
V CC =6.5V, CD=0.8V 5.5 8 mA
V+ Supply Current I CC V CC =6.5V, CD=2V 600 800μA
CD Input Resistance R CD V CC =V CD = 6.5V 50 90 k Ω
High V CDH 2 V CC V CD Input Voltage Low V CDL 0.8V
凤凰周刊订阅V CC = 3.5V 1.3 V V B Output Voltage V B V CC =5V 1.8 2.1 2.4 V B Output Resistance R OVB I VB =1mA 400 Ω V B Power Supply Rejection Ratio PSRR C VB =220µF, f =1kHz 54 dB Attenuators
R X Mode, R XI =150mVrms G RX V CC =5V 4 6 8 dB R X Mode, R XI =150mVrms G RX V CC = 3.5V 4 6 8 dB Gain Change ΔG RX1 V CC =3.5V vs. V CC =5V -0.5 0 +0.5dB AGC Gain Change ΔG RX2 V CC =3.5V vs. V CC =5V -25 -15dB Idle Mode, R XI =150mVrms G RXI -22 -20 -17dB Receive Attenuator Gain (f=1kHz, V LC =V B ) R X to T X Mode Range ΔG RX3 49 52 54dB Volume Control Range V CR 27 35 dB R XO DC Voltage V RXO R X Mode V B V ΔR XO DC Voltage ΔV RXO R X to T X Mode +-10 +-150mV R XO High Voltage V RXOH I OUT =-1mA, R XI =V B +1.5V 3.7 V
R XO Low Voltage V RXOL I OUT =+1mA, R XI =V B -1V,
Output Measured with Respect to V B
-1.5 -1 V
R XI Input Resistance R RXI R XI <350mVrs 7 10 14k Ω
ELECTRICAL CHARACTERISTICS(Cont.) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Transmit Attenuator Gain (f=1kHz)
T X Mode, T XI =
150mVrms G TX 4 6 8 dB Idle Mode, T XI =150mVrms G TXI -22 -20 -17dB T X to Rx Mode Range ΔG TXI 49 52 54dB T X O DC Voltage V TXO T X VB V ΔT XO DC Voltage ΔV TXO T X to R X Mode +-30 +-150mV T XO High Voltage V TXOH I OUT =-1mA, T XI =V B +1.5V 3.7 V
T XO Low Voltage V TXOL I OUT =+1mA, T XI =V B -1V,
Output Measured with Respect to V B
-1.5 -1 V T XI Input Resistance R TXI T XI <350mVrs 7 10 14k ΩGain Tracking G TR G RX +G TX , @T X , I DIE , R X +-0.1 dB Attenuator Control
R X Mode V LC =V B 240 mV
Idle Mode 0 mV
CT Voltage ( CT-V B ) T X Mode -240 mV
CT Source Current I CTR (Switching to R X Mode) -85 -60 -40µA CT Sink Current I CTT (Switching to T X Mode) +40 +60 +85µA CT Slow Idle Current I CTS 0 µA CT Fast Idle Internal Resistance R FI 1.5 2 3.6k ΩVLC Input Current I VLC -60 nA Dial Tone Detector Threshold V DT 10 15 20mV Microphone Amplifier ( V MUT < 0.8V, A VCL =31dB, unless otherwise specified) Output Offset M COVOS V MCO -V B , R F =180 k Ω -50 0 50mV Open Loop Gain A VOLM F <100Hz 70 80 dB Gain Bandwidth G BWM 1 MHz Output High Voltage V MCOH I OUT =1mA, V CC =5V 3.7 V Output Low Voltage V MCOL I OUT =1mA 200mV Input Bias Current I BM @MCI -40 nA
Muting(ΔGain) G MT f=1kHz, V MUT =2V 300Hz <f <10kHz -55 -68
dB MUT Input Resistance R MUT V CC =V MUT =
6.5V 50 90 k Ω
MUT High Input Voltage V MUTH 2 Vcc V
MUT Low Input Voltage V MUTL 0 0.8V Distortion THD M 300Hz <f <10kHz 0.15 % HYBID AMPLIFIER
HTO-Offset H VOS V HTO -~V B , R F =51k Ω -20 0 20mV HTO- to HTO+ Offset H BVOS R F =51k Ω -30 0 30mV Open Loop Gain A VOLH H TI to H TO-, F<100Hz 60 80 dB Gain Bandwidth G BWH 1 MHz Closed Loop Gain A VCLH H TO- to H TO+ -0.35 0 0.35dB Input Bias Current(@HTI) I BH -30 nA HTO- High Voltage V HT-H I OUT =-5mA 3.7 V HTO- Low Voltage V HT-L I OUT =+5mA 250mV HTO+ High Voltage V HT+H I OUT =-5mA 3.7 V HTO+ Low Voltage V HT+L I OUT =+5mA 450mV Distortion THD M 300Hz <f <10kHz 0.3 %
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