Monolithic Integrated Feature Phone Circuit Improved U4090B-P App

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Monolithic Integrated Feature Phone Circuit Improved U4090B-P App

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Characteristic Adjustable Transmit Receive Gain Adjustable Symmetrical Input Microphone Amplifier Anti-clipping Transmit Direction Automatic Line-loss Compensation Symmetrical Output Earpiece Amplifier Built-in Protection DTMF MUTE Input Adjustable Sidetone Suppression Independent Sending Receiving Amplification Speech Circuit with Sidetone Networks Built-in Line Detection Circuit Integrated Amplifier Loud-hearing Operation Anti-clipping Loudspeaker Amplifier Improved Acoustical Feedback Suppression Power Down Voice Switch Tone Ringer Interface with DC/DC Converter Zero Crossing Detection Common Speaker Loud-hearing Tone Ringer Supply Voltages Functional Blocks Subscriber Integrated Transistor Short-circuiting Line Voltage Answering Machine Interface Operation Possible from Line Currents Filters against Critical
Monolithic Integrated Feature Phone Circuit Improved U4090B-P
Applications
Feature Phone Answering Machine Machine Speaker Phone
Benefits
Savings Piezoelectric Transducer Complete System Integration Analog Signal Processing Chip Very External Components Fewer Components Protection
Description
microcontroller-controlled telephone circuit U4090B-P linear integrated circuit feature phones, answering machines machines. contains speech circuit, tone ringer interface with DC/DC converter, sidetone equivalent protection rectifiers. circuit line powered contains components necessary amplification signals adaptation line. integrated voice switch with loudspeaker amplifier allows loud-hearing handsfree operation. With anti-feedback function, acoustical feedback during loud-hearing reduced significantly. generated supply voltage suitable wide range peripheral circuits.
Rev. 4741B-CORD-10/03
Figure Block Diagram
Figure Detailed Block Diagram
IMPSEL supply control Line detect Supply Current supply IREF LIDET VRING Receive attenuation MUTR STIL STIS RECIN RFDO
with EEPROM/ DTMF
U4090B-P
SENSE VMPS Power Impedance control
Speech circuit Voice switch Tone ringer Audio amplifier
MICO TXIN
MIC1
MIC2
DTMF
DTMF
TTXA
INLDR
INLDT
TLDR
TLDT
Acoustical feedback suppression control
Transmit mute control
ATAFS
COSC SWOUT
SACL
TSACL Mute receive control
Loudhearing Tone ringing
MUTX
RECO2 RECO1
4741B-CORD-10/03
U4090B-P
Configuration
Figure Pinning SSO44
DTMF MICO MIC2 MIC1 SENSE VMPS SWOUT COSC VRING RFDO LIDET IMPSEL TSACL TXIN RECIN TTXA RECO1 STIL STIS RECO2 MUTR
U4090B-P
IREF TLDR TLDT INLDR INLDT ATAFS MUTX
4741B-CORD-10/03
Description
Symbol DTMF MICO SENSE VMPS SWOUT COSC VRING RFDO LIDET Function resistor from this sets amplification microphone DTMF signals, input amplifier muted applying Input DTMF signals, also used answering machine hands-free input Output microphone preamplifier Non-inverting input microphone amplifier Inverting input microphone amplifier Active high input reducing current consumption circuit, simultaneously shorted internal switch internal equivalent inductance circuit proportional value capacitor this pin, resistor connected ground used reduce line voltage Line voltage Reference point AC-output signals small resistor (fixed) connected from this sets slope characteristic also effects line-length equalization characteristics line current which loudspeaker amplifier switched Unregulated supply voltage peripheral circuits (voice switch), limited typically Output loudspeaker amplifier Unregulated supply voltage micorcontroller, limited Regulated supply voltage peripheral circuits (especially microprocessors), minimum output current: (ringing) (speech mode) Output driving external switching transistor 40-kHz oscillator ringing power converter Input ringing signal protected internal Zener diode Threshold adjustment ringing frequency detector Output ringing frequency detector Line detect; output when line current more than Control input selection line impedance Mute second transmit stage (TXA); also used indication external supply (answering machine); last chosen impedance stored Time constant anti-clipping speaker amplifier Current input setting gain speaker amplifier, adjustment characteristic logarithmical, RGSA speaker amplifier switched Speaker amplifier input (for loudspeaker, tone ringer hands-free use) Three-state input transmit mute: Speech condition; inputs MIC1/MIC2 active DTMF condition; input DTMF active. part input signal passed receiving amplifier confidence signal during dialing Input DTMF used answering machine hands-free use; receive branch affected Attenuation acoustical feedback suppression, maximum attenuation circuit resistor this pin, without resistor, switched Input transmit level detector
IMPSEL
TSACL
MUTX
ATAFS INLDT
U4090B-P
4741B-CORD-10/03
U4090B-P
Description (Continued)
Symbol INLDR TLDT TLDR IREF Function Input receive level detector Time constant transmit level detector Time constant receive level detector Automatic gain adjustment with line current, resistor connected from this sets starting point, maximum gain change: Internal reference current generation; RREF IREF Sidetone reduction output Output resistance approximate: Maximum load impedance: Reference node microphone-earphone loudspeaker amplifier, supply electret microphone Three-state mute input Normal operation Mute piece Mute RECIN signal Condition earpiece mute stored Inverting output receiving amplifier Input sidetone network (short loop) answering machine Input sidetone network (long loop) Input receiving amplifier coupling feedback path Output receiving amplifier resistor connected from this sets receiving amplification circuit; amplifier muted applying Time constant anti-clipping transmit path Input receiving path; input impedance typically Input intermediate transmit stage, input resistance typically
MUTR
Note:
RECO RECO TTXA RECIN TXIN
Filters against electromagnetic interference (EMI) located following pins: MIC1, MIC2, RECIN, TXIN, STIS, STIL RAC.
4741B-CORD-10/03
Line Interface Supply-voltage Generation
line interface consists electronic inductance dual-port output stage which charges capacitors VMPS value equivalent inductance given RSENSE CIND ((RDC R30)/(RDC R30)) order improve supply during worst-case operating conditions, current sources IBOPT IMPSOPT hand extra amount current supply voltages when NPNs parallel unable conduct current. flowchart control current sources (Figure shows priority supply VMPS achieved.
Figure Line Interface with Electronic Inductance Generation Regulated Unregulated Supply
SENSE RSENSE CIND
IBOPT
IMPSOPT
VMPS
VOFFS
Figure Supply Capacitors CMPS Charged with Priority CMPS
VSENSE VMPS
VMPS
VSENSE
IMPSOPT IBOPT
Charge CMPS (IMPSOPT) Charge (IBOPT) Reduce IBOPT (IMPSOPT
U4090B-P
4741B-CORD-10/03
U4090B-P
Figure Supply Functional Blocks Controlled Input Voltages VRING Logic Inputs IMPSEL
VRING
Voltage regulator
VMPS
Power supply Voltage regulator
IMPED
CONTR LIDET
IMPSEL
LIDET
VLon
RFDO
TXACL
OFFSA COMP
SAI,SA SACL
MIC, DTMF AGA, RA1, MUTE REC, STBAL RECATT
U4090B-P contains identical series regulators which provide supply voltage suitable microprocessor. speech mode, both regulators active because VMPS charged simultaneously DC-line interface. Output current capacitor VMPS used provide microcomputer with sufficient power during long-line interruptions. Thus, long flash pulses bridged display turned more than seconds after going hook. When system ringing mode, charged on-chip ringing power converter. this mode only regulator used supply with maximum
Supply Structure Chip
major benefit chip that uses very flexible supply structure which allows simple realization numerous applications such Group listening phone Hands-free phone Ringing with built speaker amplifier Answering machine with external supply
special supply topology various functional blocks illustrated Figure There four major supply states: Speech condition Power down (pulse dialing) Ringing External supply
4741B-CORD-10/03
speech condition system supplied line current. LIDET-block detects line voltage above fixed threshold (1.9 internal signal VLON activated, thus switching switching other blocks chip. line voltages below switches remain their quiescent state shown Figure OFFSACOMP disables group listening feature (SAI, SACL, AFS) below line currents approximately When chip power-down mode high), e.g., during pulse dialing, internal switch shorts line amplifiers switched off. this condition, LIDET, voltage regulators IMPED CONTR only active blocks. During ringing, supply system into ringing power converter (RPC). only functional amplifiers speaker amplifier section (SAI, SACL). answering machine, chip powered external supply This application allows possibility activate amplifiers (except transmit line interface TXA). Selecting IMPSEL high impedance activates switches line.
Acoustic Feedback Suppression
Acoustical feedback from loudspeaker handset microphone cause instability system. U4090B-P offers very efficient feedback suppression circuit, which uses modified voice switch topology. Figure shows basic system configuration. attenuators ATT) reduce critical loop gain introducing externally adjustable amount loss either transmit receive path. sliding control block CONTR determines, whether signal attenuated. overall loop gain remains constant under operating conditions. Selection active channel made comparison logarithmically compressed envelope curve. system configuration group listening, which realized U4090B-P, illustrated Figure represent attenuators, logarithmic envelope detectors shown simplified (operational amplifiers with diodes). Figure Basic Voice Switch System
Handset microphone Hybrid contr Line
Loudspeaker
U4090B-P
4741B-CORD-10/03
U4090B-P
Figure Integration Acoustic Feedback Suppression Circuit into Speech Circuit Environment
MICO INLDT TLDT
Zint
control att.
TLDR RECIN RECO1 STIS
INLDR
Figure Acoustic Feedback Suppression Alternative Control Transmit Speaker Amplifier Gain
TLDT
RLDT INLDT IAGAFS IATAFS IGSA
RLDR INLDR
IATGSA TLDR RATAFS ATAFS
4741B-CORD-10/03
detailed diagram (acoustic feedback suppression) given Figure Receive transmit signals first processed logarithmic rectifiers order produce envelopes speech TLDT RLDT. After amplification, decision made differential pair which direction should transmitted. attenuation controlled amplifiers determined emitter current which consists three parts: IATAS IATGSA IAGAFS sets maximum attenuation decreases attenuation when speaker amplifier gain reduced decreases attenuation according loop gain reduction caused function
IATAFS IATGSA IAGAFS
0.67 dB/µA
Figure illustrates principle relationship between speaker amplifier gain (GSA) attenuation (ATAFS). Both parameters adjusted independently, internal coupling between them considered. maximum usable value shape characteristic moved x-direction adjusting resistor RATAFS, thus changing ATAFSm. actual value attenuation (ATAFSa), however, determined reading value which belongs actual gain GSAa. speaker amplifier gain reduced, attenuation automatically reduced same amount order achieve constant loop gain. Zero attenuation speaker gains GSA0 ATAFSm. Figure Reducing Speaker Amplifier Gain Results Equal Reduction Attenuation
ATAFS (dB) ATAFSm ATAFSa RATAFS RATAFS usable
GSAo
GSAa
(dB)
U4090B-P
4741B-CORD-10/03
U4090B-P
Figure Line Detection with Comparators Speech Mode Pulse Dialing
LIDET
Line Detection (LIDET)
line current supervision active under operating conditions U4090B-P. speech mode inactive), line-current comparator uses same thresholds comparator switching entire speaker amplifier. basic behavior illustrated Figure Actual values ILON/ILOFF vary slightly with adjustment characteristics selection internal line impedance. When Power Down activated (during pulse dialing), entire line current flows through short-circuiting transistor (see Figure long above typically output LIDET low. This comparator does hysteresis. Figure Line Detection Speech Mode with Hysteresis
LIDET
ILOFF
ILON
Ringing Power Converter transforms input power VRING (high voltage/low current) into equivalent output power (low voltage/high current) which capable driving low(RPC)
ohmic loudspeaker. Input impedance VRING fixed efficiency step-down converter approximate 65%.
4741B-CORD-10/03
Figure Comparator Thresholds Depending Mask Line Impedance
(mA) ILON line impedance ILOFF ILON line impedance ILOFF
Ringing Frequency Detector (RFD)
U4090B-P offers output signal microcontroller, which digital representation double ringing frequency. generated current comparator with hysteresis. input voltage VRING transformed into current RTHA. thresholds RFDO VRING phase. second comparator with hysteresis used enable output RFDO long supply voltage microprocessor above
Absolute Maximum Ratings
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. This stress rating only functional operation device these other conditions beyond those indicated operational sections this specification implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
Parameters Symbol Value Unit
Line current line voltage Maximum input current, Junction temperature Ambient temperature Storage temperature Total power dissipation, Tamb 60°C
IRING Tamb Tstg Ptot
+150
Thermal Resistance
Parameters Symbol Value Unit
Junction ambient SSO44
RthJA
U4090B-P
4741B-CORD-10/03
U4090B-P
Electrical Characteristics
kHz, mVrms, Tamb 25°C, RGSA Zear open, VIMPSEL GND, VMUTX GND, VMUTR GND, unless otherwise specified
Parameters Characteristics Test Conditions Symbol Min. Typ. Max. Unit
voltage drop over circuit
10.0 41.8 ±0.5 ±0.5 ±0.5
Transmission Amplifier, VMIC Unless Otherwise Specified
Range transmit gain Transmitting amplification Frequency response Gain change with current Gain deviation CMRR microphone amplifier Input resistance amplifier Distortion line mVrms VMIC CTXA IMPSEL open Noise line psophometrically weighted Anti-clipping attack time release time CTXA each overdrive VMIC VMIC RAGA MUTX open IMPSEL open 3400 open Tamb +60°C
39.8
CMRR VLmax VMICOmax
Maximum output voltage
-5.2
dBmp
Gain operating current
42.5
Distortion operating current
Line loss compensation Mute suppression muted (microphone preamplifier) muted (second stage)
DGTI
-6.4
-5.8
-5.2
GGTTX
4741B-CORD-10/03
Electrical Characteristics (Continued)
kHz, mVrms, Tamb 25°C, RGSA Zear open, VIMPSEL GND, VMUTX GND, VMUTR GND, unless otherwise specified
Parameters Test Conditions Symbol Min. Typ. Max. Unit Receiving Amplifier, Unless Otherwise Specified, VGEN
Adjustment range receiving gain Receiving amplification Amplification DTMF signal from DTMF RECO Frequency response Gain change with current Gain deviation Ear-protection differential MUTE suppression RECATT DTMF operation Output voltage differential Maximum output current Receiving noise psophometrically weighted Output resistance Line loss compensation
single ended differential MUTR differential differential VMUTX 3400 Tamb +60°C VGEN Vrms MUTR open VMUTR VMUTX Zear Zear Zear Each output against RAGA VGEN VIMPSEL VIMPSEL VGEN signal VSAI RGSA RGSA
DGRF
-1.75
-0.25
Vrms
±0.5 ±0.5 ±0.5
0.775
DGRI
Vrms (peak) dBmp
-7.0
-6.0
-5.0
Gain operating current
impedance
Zimp Zimp
Distortion operating current
Speaker Amplifier
Minimum line current operation Input resistance
ILmin
Gain from
35.5
36.5
37.5
U4090B-P
4741B-CORD-10/03
U4090B-P
Electrical Characteristics (Continued)
kHz, mVrms, Tamb 25°C, RGSA Zear open, VIMPSEL GND, VMUTX GND, VMUTR GND, unless otherwise specified
Parameters Test Conditions Symbol Min. Typ. Max. Unit
Output power
Load resistance VSAI Tamb +60°C VSAI open 3400 over drive
DGSA
µVpsoph
Output noise (Input open) psophometrically weighted Gain deviation
Mute suppression
VSAO
DGSA
Gain change with current Resistor turning speaker amplifier Gain change with frequency Attack time anti-clipping Release time anti-clipping
±0.5 40.7 41.7 42.7 ±0.5 ±0.5
RGSA
DGSA
DTMF Amplifier Test Conditions: VMUTX
Adjustment range DTMF gain DTMF amplification Gain deviation Input resistance Distortion DTMF signal Gain deviation with current Adjustment range attenuation
mute active VDTMF Mute active: MUTX Tamb +60°C IINLDT RATAFS IINLDR IINLDP RATAFS IINLDR
Acoustic Feedback Suppression
Attenuation transmit gain
Attenuation speaker amplifier
DGSA
disable
VATAFS
Supply Voltages, VMIC Tamb +60°C
4741B-CORD-10/03
Electrical Characteristics (Continued)
kHz, mVrms, Tamb 25°C, RGSA Zear open, VIMPSEL GND, VMUTX GND, VMUTR GND, unless otherwise specified
Parameters Test Conditions Symbol Min. Typ. Max. Unit
VMPS
infinite VRING 20.6 RFDO: high VHYST VRINGON VRINGOFF VRING 3400 VRING Vrms VRING VRING VRING RFDO high IRING VMUTR VMUTR Mute low;
VMPS
Ringing Power Converter,
Maximum output power Threshold ring frequency detector Input impedance Input impedance speech mode
VRINGON VHYST RRING RRINGSP VRFDO VMPON VRINGmax 30.8
17.5 11.0
Logic level frequency detector Ring detector enable Zener diode voltage
MUTR Input
33.3
MUTR input current
IMUTE VMUTE VMUTE
MUTR input voltage
Input
Mute high;
input current Input voltage Voltage drop
Input Characteristics IMPSEL
active, active inactive active active VIMPSEL VIMPSEL Input high Input
Input current
IIMPSEL IIMPSEL VIMPSEL VIMPSEL IMUTX IMUTX
Input voltage
MUTX Input
Input current
VMUTX VMUTX
U4090B-P
4741B-CORD-10/03
U4090B-P
Electrical Characteristics (Continued)
kHz, mVrms, Tamb 25°C, RGSA Zear open, VIMPSEL GND, VMUTX GND, VMUTR GND, unless otherwise specified
Parameters Test Conditions Symbol Min. Typ. Max. Unit
Input voltage
Line Detection
Input high Input
VMUTX VMUTX ILON ILOFF ILONPD
12.6 11.0
Line current LIDET active Line current LIDET inactive Current threshold during power down
inactive inactive active
U4090B-P Control
Table Selection Mute Line Impedance
Logic Level IMPSEL MODE
Line impedance Line impedance Line impedance Line impedance
Speech
Transmit-mute
Transmit-mute
Speech
Table Selection Earpiece Mute Answering Machine Mode
Logic Level MUTR MODE
RECATT STIS STIL RECATT STIS STIL RECATT STIS STIL STIS RECATT STIS STIL
Speech
answering machine
answering machine
Speech earpeace mute
4741B-CORD-10/03
Table Selection Transmit Mute
Logic Level MUTX MODE
transmit enabled receive enable TXACL DTMF transmit enabled receive enable TXACL DTMF transmit enabled DTMF receive enable TXACL
Speech
answering machine
DTMF dialling
Table Specification Logic Levels
Logic Level
(0.3 (VMP (open input) (VMP
Explanation Abbreviations
RECATT Receive attenuation STIS, STIL Inputs sidetone balancing amplifiers External supply Acoustic feedback suppression control Automatic gain adjustment Inverting receive amplifier TXACL Transmit anti-clipping control
U4090B-P
4741B-CORD-10/03
U4090B-P
Figure Typical Characteristic
infinity
130k
(mA)
Figure Typical Adjustment Range Transmit Gain
(dB)
Figure Typical Adjustment Range Receive Gain (Differential Output)
(dB)
4741B-CORD-10/03
Figure Typical Characteristic
RAGA
(dB)
RAGA RAGA
(mA)
Figure Typical Load Characteristic Maximum (RDC Infinity) DC-characteristic 3-mW Loudspeaker Output
(mA)
Infinity; mV/1 kHz; PSAO RGSA 560k
U4090B-P
4741B-CORD-10/03
U4090B-P
Figure Typical Load Characteristic Medium DC-characteristic (RDC 3-mW Loudspeaker Output
(mA)
kHz; PSAO RGSA 560k
Figure Typical Load Characteristic Minimum DC-characteristic (RDC 3-mW Loudspeaker Output
(mA))
PSAO RGSA 560k
4741B-CORD-10/03
Figure Basic Test Circuit
open open ZEAR RGSA
U4090B-P
U4090B-P
1000 SD103A BC556 open VRING
Mico
Reference figure connected pins closed: speech mode
closed: ringer mode
4741B-CORD-10/03
4741B-CORD-10/03
Mico RAGA ZEAR
RGSA
Figure Test Circuit Characteristics Line Detection
U4090B-P
1000 open LIDET
VMIC
Line detection:
(external supply):
Open pins should connected shown Figure
U4090B-P
Figure Test Circuit Transmission Amplifier
open
Mico open
RAGA
ZEAR
U4090B-P
U4090B-P
1000
VMICO
open
Transmitting amplification Vmic
Vmic
Line loss compensation: mA), closed Gain change with current:
Input resistance:
closed) open) Common mode rejection ratio: CMRR with S1b, closed, open Mute suppression: MUTX low) MUTX open) GTTX IMPSEL low) IMPSEL open) Open pins should connected shown Figure
4741B-CORD-10/03
4741B-CORD-10/03
open RAGA
VZEAR,
open
Mico
ZEAR
Figure Test Circuit Receiving Amplifier
U4090B-P
1000 VDTMF
VGEN
open
Line loss compensation: mA), closed Receiving noise: Receive amplification: VZEAR/VLR) open) DTMF-control signal: (VZEAR/VDTMF) closed) AC-impedance: (VLR/(VGEN VLR)) Mute suppression: RECATT: (VLR/VZEAR) +GR, MUTR open RA2: (VLR/VZEAR) MUTR DTMF operation: VLR/VZEAR) MUTX Open pins should connected shown Figure
U4090B-P
Figure Test Circuit Speaker Amplifier
IINLDR
VATAFS
U4090B-P
IINLDT VSAI ZEAR RGSA
Mico
U4090B-P
1000 VLIDET
VMIC VSAO, closed VZIN, open
Input impedance: (VZIN/(VSAO VZIN))
Gain from SAO: (VSAO/VSAI) VSAO RSAO
Output power:
Attenuation transmit gain: closed Open pins should connected shown Figure
4741B-CORD-10/03
4741B-CORD-10/03
Mico ZEAR
open
Figure Test Circuit DTMF Amplifier
U4090B-P
1000 VDTMF
closed open DTMF-amplifier: 20log (VL/VDTMF) Input resistance: (VL50K/(VL VL50k)) Open pins should connected shown Figure
VGEN3
U4090B-P
Figure Test Circuit Ringing Power Converter
Vsao2 closed RSAO
Max. output power:
Threshold ringing frequency detector: detecting VRFDO, when driving VRING from (VRINGON) back again (VRINGOFF) closed)
RRING
Vring
Input impedance:
VRING closed) IRING
Input impedance speech mode mA): RRINGSP Iring closed)
U4090B-P
VSAI RGSA
Ring detector enable: detecting VRFDO, when driving from
(VMPON) back again (VMPOFF) (S5, closed)
Open pins should connected shown Figure
U4090B-P
ramp 1000 BC556 IRING VRING SD103A IRING ramp 20.6 VRING VRFDO
4741B-CORD-10/03
4741B-CORD-10/03
RGSA IMUTX
IMUTR
ZEAR
Figure Test Circuit Input Characteristics Ports
U4090B-P
1000
IIMPSEL
Open pins should connected shown figure
open
U4090B-P
Figure Application Circuit Loud-hearing
hook switch (Option) Ring
U4090B-P
U4090B-P
Earpeace Micro controller
Microphone
DTMF Generator
RECO
MICO
Loudspeaker
4741B-CORD-10/03
4741B-CORD-10/03
hook switch (Option) Earpiece BC177 LOGTX Microcontroller Ring
DTMF
HF-Mic
Microphone
Figure Application Hands-free Operation
RECO
LOGTX
U4090B-P
Loud speaker
U4090B-P
Table Typical Values External Components (Figure Figure
Name Value Name Value Name Value Name Value
U4090B-P
4741B-CORD-10/03
U4090B-P
Ordering Information
Extended Type Number Package Remarks
U4090B-PFN U4090B-PFNG3 T4090B-PC
SSO44 SSO44
Taped reeled Chip foil
Package Information
Package SSO44
Dimensions
18.05 17.80 9.15 8.65 7.50 7.30
2.35 16.8 0.25 0.10
0.25 10.50 10.20
technical drawings according specifications
4741B-CORD-10/03
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4741B-CORD-10/03

Monolithic Integrated Feature Phone Circuit Improved U4090B-P App

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