SPEAKER PHONE WITH SPEECH NETWORK KA8601C monolithic integrated c

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SPEAKER PHONE WITH SPEECH NETWORK KA8601C monolithic integrated c

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KA8601C
SPEAKER PHONE WITH SPEECH NETWORK
KA8601C monolithic integrated circuit high performance speaker phone system. KA860lC consists speaker phone speech network. Speaker phone includes attenuators, amplifiers, level detectors, attenuator control, hybrid amplifiers, regulator circuit. Speech network includes transmit amp, receive amp, voltage regulator dialer, side tone control, line equalizer.
48-SDIP-600
FEATURES
Speaker Phone Operating Voltage (3.0 6.5V) High Attenuator Gain Range (52dB) Improved Sensitivity (Four-point Signal Sensing) Chip Disable Active Standby Operation Microphone Gain External Components Speech Network Operating Voltage (1.5V speech) Regulated Voltage Dialer (Typically 3.3V) Transmit, Receive, Side Tone Gains External Components Mute Input DTMF Dialing
ORDERING INFORMATION
Device KA8601C Package 48-SDIP-600 Operating Temperature 25°C 75°C
BLOCK DIAGRAM
DETO
DETO
DETO
DETO
DETI
DETI
DETI
DETI
DTO-
MICO
MICI
POWER Back Noise Monitor 3.3Vreg
level detector
level detector
Attenuator
SPEAKER PHONE PART
hybrid
ATTENUATOR CONTROLLER
hybrid
sidetone
amp2
FILTER
SPEECH NET8 WORK PART
level shift
1.7Vreg
amp1
RXOSUM
Attenuator
RXO+
DTO+
MICI+
MICO
RXO-
MICI-
KA8601C
SPEAKER PHONE WITH SPEECH NETWORK
CONFIGURATION
DTO+ MICIMICI+ MICO RXO+ RXORXI RXOSUM
DTODTI RXOATT RXIATT PDRX DETIRX1 DETORX1 DETOTX1 DETITX1 MICO MICI DETIRX2 DETORX2 DETOTX2 DETITX2 PDTX TXIATT TXOATT
KA8601C
Fig.
DESCRIPTION
Symbol DTO+ MICIMICI+ MICO Description Output second hybrid amplifier. Chip Disable. logic (<0.8V) sets normal operation. Filter input. Filter output. Mute input. logic sets normal speech mode. resistor connected from this sets terminating impedance. Power supply speech network. Supply voltage derived from loop current. output operates this pin. Resistor this characteristics circuit. volt regulated output which used bias mic. Inverting differential input amp. Non-inverting differential input amp. Ground speech network. output. Input from amp. Loop current sensing input.
KA8601C
SPEAKER PHONE WITH SPEECH NETWORK
DESCRIPTION (continued)
Symbol RXO+ RXORXI TXOATT TXIATT DETITX2 DETOTX2 DETORX2 DETIRX2 MICI MICO DETTX1 DETOTX1 DETORX1 DETIRX1 Description non-inverting differential output. connection. connection. inverting differential output. Input amp. Summed output current amp. Input current amp. Mode select input. logic pulse dialing, logic tone (DTMF) dialing. supply voltage speaker phone part. regulated volt output external dialer. Output attenuator. Input attenuator. This voltage system ground, biases volume control. filter required. this sets time constant background monitor. Input level detector mike/speaker side. Output level detector mike/speaker side. Output level detector mike/speaker side. Input level detector mike/speaker side. This sets response time circuit switch modes. Volumn control input. Mute input. logic (<0.8V) sets normal operation. logic high (>2.0V) mutes amp. Input summing node amp. Output external resistors. Input level detector line side. Output level detector line side. Output level detector line side. Input level detector line side. this sets time constant background monitor. Ground speaker phone part. Input attenuator dial tone detector. Output attenuator. Input summing node amp. Output first hybrid amplifier.
KA8601C
SPEAKER PHONE WITH SPEECH NETWORK
ABSOLUTE MAXIMUM RATINGS
Characteristic Supply Voltage Speaker Phone Voltage Voltage CD,MT Voltage TXI, RXI, Supply Voltage Speech Network Supply Voltage dialer Voltage MTS, Current Through Current into Operating Temperature Storage Temperature Symbol (VC) (CM) (TRH) (MS) (VL, (ZB) 25°C) Test Conditions Unit Value -1.0 Unit
ELECTRICAL CHARACTERISTICS
Characteristic Symbol
SPEECH NETWORK 25°C, unless otherwise noted) Speech Mode Line Voltage Pulse Mode Tone Mode Voltage Operating Voltage (MF) 30mA 4.5V Tone Mode 30mA 120mA 30mA Speech Mode Tone Mode 1.6mA Speech Mode Operating Current (Max) (MAX) 30mA Pulse Mode Tone Mode MICO Bias Voltage Bias Voltage Gain Common Mode Rejection Ratio Gain Reduction Gain Distortion Gain Distortion Side Tone Gain VBIAS (MPO) VBIAS (TxTs) (MIC) CMRR(MIC) (MIC) (TX) (RX) (ST) Speech Mode 30mA Speech Mode 30mA 30mA 30mA 80mA Speech Mode 30mA 80mA Speech Mode Speech Mode 30mA 30mA 30mA Speech Mode Speech Mode Speech Mode 1.55 0.04 1.08 0.086 34.8 -10.5 11.5 1.85
KA8601C
SPEAKER PHONE WITH SPEECH NETWORK
ELECTRICAL CHARACTERISTICS
Characteristic Side Tone Rejection MUTE Input Impedance MUTE Input Voltage MUTE Input High Voltage Input Voltage Input High Voltage
(Continued) Test Condition -0.3 Speech Mode Unit
Symbol (MUTE) (MUTE) (MUTE) (MS) (MS)
Level Shift
30mA
Pulse Mode Tone Mode
SPEAKER PHONE 25°C, 5.0V, unless otherwise noted) Operating Current 6.5V 0.8V Reference Voltage VREF 3.5V Attenuator Gain Attenuator Gain Change Attenuator Gain Change Attenuator Gain (Idle Mode) Attenuator Gain Range Volume Control Range Output Voltage Output Voltage Change Output High Voltage Output Voltage (with respect Mode Distortion Voltage (with respect Dial Tone Detector Threshold Attenuator Gain Attenuator Gain Range Output Voltage Output Voltage Change GATT (RX) GATT (RX) GATT (RX) GATT (IM) GATT (RX) (RX) (RX) (RX) (RX) (RX) Mode (DET) GATT (TX) GATT (TX) (TX) (TX) Idle Mode Mode VRXI 3.0V Mode VRXI 3.5V VRXI 3.5V, 2.8V, 3.5V, 5.0V 2.8V, 5.0V Mode) 0.1VB 1.0mA -0.5 -1.5 +240 -240 +0.5 ±150 -1.0 ±150
KA8601C
SPEAKER PHONE WITH SPEECH NETWORK
ELECTRICAL CHARACTERISTICS
Characteristic Output High Voltage Output Voltage Mode Distortion Voltage Gain Output Offset Voltage Output High Voltage Output Voltage Input Bias Current Muting (Gain) Distortion MUTE Input High Voltage MUTE Input Voltage Open Loop Gain (Hybrid Amp) DTO-Output High Voltage DTO-Output Voltage DTO+Output High Voltage DTO+Output Voltage Distortion Filter Offset Voltage Filter Input Bias Current
(Continued) Test Conditions VTXI 3.5V VTXI 1.0V VMIC 1.0V VMIC 3.0V 1KHz 0.3KHz 10KHz -5mA -5mA 0.15 Unit
Symbol (TX) (TX) THDTX (MIC) (MIC) (MIC) (MIC) IBIAS (MIC) (MUTE) (MUTE) (MUTE) (HA) (DTO (DTO (DTO (DTO VBIAS
KA8601C
SPEAKER PHONE WITH SPEECH NETWORK
APPLICATION INFORMATION FUNCTION DESCRIPTION
SPEECH NETWORK MICROPHONE AMPLIFIER This microphone amplifier equipped with fixed gain (30dB). basic configuration shown figure
MICI+ MIC20K
30dB MICO
This amplifier mute function. mute signal from dialer inputted when speech network mute mode, microphone amplifier will muted. VOLTAGE REGULATOR (DIALER INTERFERENCE) This voltage regulator minimum output voltage volts. When dialer motion, minimum current 1.0mA, where when dialer moving minimum current 2.2mA. VOLTAGE REFERENCE Generally when voltage reference mode, microphone's bias voltage used, when TXlATT mode, bias voltage used. output voltage voltage reference minimum volts. SPEAKER PHONE MICROPHONE AMPLIFIER This device amplifies outside microphone signals, which inputted while inverting mode. alters elements, microphone amplifier allows them modulated. open loop gain 80dB, while band width typically 1.0KHz. mute function, when operating mute mode least 2.0V, microphone amplifier gain reduced around 40dB. mute mode used, must connected with ground.
Bias Voltage MICO
Fig.
KA8601C
SPEAKER PHONE WITH SPEECH NETWORK
VOLUME CONTROL volume control only applied receive mode. voltage mode same receive attenuator gain maximized transmit gain minimized. same time, mode voltage less than receive attenuator gain reduced.
KA8601C VOLUME
Fig.
VOICE DETECTION FUNCTION voice detection function compares microphone amplifier output level with outside audio amplifier level transmit attenuator output level with receive attenuator input level, after which they inputted into control box. block diagram voice detection function follows:
DETO
PDRX Background Noise Monitor
PDTX
DETO
DETIRX
Comparator
Comparator
DETI
DETITX
Attenuator Control
DETI
DETO
DETO
Fig.
useful background noise monitor when high background noise occurs. When input signals background noise monitor increased, voltage PDRX (PDTX) mode stably increased. increase time determined 100K 47µF. ATTENUATOR CONTROL figure each signal coming into amplifier amplified then inputted into comparator (C1, C2). comparator compares amplified signal levels, after which they inputted into attenuator control box. attenuator control processes these signals (CO1, CO2, CO3, CO4) logic signals, which into following modes:
KA8601C
SPEAKER PHONE WITH SPEECH NETWORK
Receive Mode Transmit Mode Slow Idle Mode Fast Idle Mode Which above modes determined depending following conditions: Receive Mode DETOTX1 DETORX1, DETOTX2 DETORX2, PDTX, PDRX Transmit Mode DETOTX1 DETORX1, DETOTX2 DETORX2, PDTX PDRX Slow Idle Mode DETOTX1 DETORX1, DETOTX2 DETORX2, PDTX PDRX DETOTX1 DETORX1, DETOTX2 DETORX2, PDTX PDRX DETOTX1 DETORX1, DETOTX2 DETORX2, PDTX PDRX DETOTX1 DETORX1, DETOTX2 DETORX2, PDTX PDRX Fast Idle Mode DETOTX1 DETORX1, DETOTX2 DETORX2, PDTX PDRX DETOTX1 DETORX1, DETOTX2 DETORX2, PDTX PDRX refer voltage level refers doesn't matter zero SWITCHING TIME switching time speaker phone determined outside elements. Idle Mode Mode 4,000 Mode Fast Idle Mode 2,000 Mode Slow Idle Mode refer capacitor resistor between VCC.
KA8601C
SPEAKER PHONE WITH SPEECH NETWORK
APPLICATION CIRCUIT

SPEAKER PHONE WITH SPEECH NETWORK KA8601C monolithic integrated c

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