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Features
* * * * * * * * * * * * * * * * * * * * * * * *
DC Characteristic Adjustable Transmit and Receive Gain Adjustable Symmetrical Input of Microphone Amplifier Anti-clipping in Transmit Direction Automatic Line-loss Compensation Symmetrical Output of Earpiece Amplifier Built-in Ear Protection DTMF and MUTE Input Adjustable Sidetone Suppression Independent of Sending and Receiving Amplification Speech Circuit with Two Sidetone Networks Built-in Line Detection Circuit Integrated Amplifier for Loud-hearing Operation Anti-clipping for Loudspeaker Amplifier Improved Acoustical Feedback Suppression Power Down Voice Switch Tone Ringer Interface with DC/DC Converter Zero Crossing Detection Common Speaker for Loud-hearing and Tone Ringer Supply Voltages for all Functional Blocks of a Subscriber Set Integrated Transistor for Short-circuiting the Line Voltage Answering Machine Interface Operation Possible from 10 mA Line Currents Filters against EMI on Critical I/O
Monolithic Integrated Feature Phone Circuit EMI Improved U4090B-P
Applications
* * * *
Feature Phone Answering Machine Fax Machine Speaker Phone
Benefits
* * * *
Savings of One Piezoelectric Transducer Complete System Integration of Analog Signal Processing on One Chip Very Few External Components Fewer Components for EMI Protection
Rev. 4741C-CORD-11/05
1. Description
The microcontroller-controlled telephone circuit U4090B-P is a linear integrated circuit for use in feature phones, answering machines and fax machines. It contains the speech circuit, tone ringer interface with DC/DC converter, sidetone equivalent and ear protection rectifiers. The circuit is line powered and contains all components necessary for amplification of signals and adaptation to the line. An integrated voice switch with loudspeaker amplifier allows loud-hearing or hands-free operation. With an anti-feedback function, acoustical feedback during loud-hearing can be reduced significantly. The generated supply voltage is suitable for a wide range of peripheral circuits. Figure 1-1. Block Diagram
Speech circuit Audio amplifier Loudhearing and Tone ringing
Voice switch
Tone ringer
MC with EEPROM/ DTMF
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Figure 1-2.
4741C-CORD-11/05
GT MICO TXIN IMPSEL 21 31 7 600 MIC TXA 900 Power supply Impedance control VL TX ACL IL Current QS supply 34 10 11 14 13 1 3 44 33 8
STO
VL
AGA IND
SENSE VB
VMP
VMPS
Detailed Block Diagram
MIC1
5
VM 9 GND 6 PD 32 IREF AGA control ISupply Line detect 20 17 Transmit mute control Receive attenuation RA2 RA1 ST BAL + + 18 36 40 41 39 RECO2 RECO1 GR RAC 38 STIL 37 STIS 43 RECIN THA 25 MUTX MUTR 35 + VMP 16 COSC 15 SWOUT + 19 RFDO LIDET VRING
MIC2
4
DTMF
DTMF
2
TTXA
42
INLDR
28
INLDT
27
TLDR
30
TLDT
29
Acoustical feedback suppression control
26
ATAFS SA
12
SAO
22 SACL -1
TSACL Mute receive control
24 SAI
SAI
23 GSA
U4090B-P
3
2. Pin Configuration
Figure 2-1. Pinning SSO44
GT DTMF MICO MIC2 MIC1 PD IND VL GND 1 2 3 4 5 6 7 8 9 44 43 42 41 40 39 38 37 36 35 34 TXIN RECIN TTXA GR RECO1 RAC STIL STIS RECO2 MUTR VM STO IREF AGA TLDR TLDT INLDR INLDT ATAFS MUTX SAI GSA
SENSE 10 VB 11
U4090B-P
SAO 12 VMPS 13 VMP 14 SWOUT 15 COSC 16 VRING 17 THA 18 RFDO 19 LIDET 20 IMPSEL 21 TSACL 22 33 32 31 30 29 28 27 26 25 24 23
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Table 2-1.
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Pin Description
Symbol GT DTMF MICO MIC2 MIC1 PD IND VL GND SENSE VB SAO VMPS VMP SWOUT COSC VRING THA RFDO LIDET Function A resistor from this pin to GND sets the amplification of the microphone and DTMF signals, the input amplifier can be muted by applying VMP to GT Input for DTMF signals, also used for the answering machine and hands-free input Output of microphone preamplifier Non-inverting input of microphone amplifier Inverting input of microphone amplifier Active high input for reducing the current consumption of the circuit, simultaneously VL is shorted by an internal switch The internal equivalent inductance of the circuit is proportional to the value of the capacitor at this pin, a resistor connected to ground may be used to reduce the DC line voltage Line voltage Reference point for DC- and AC-output signals A small resistor (fixed) connected from this pin to VL sets the slope of the DC characteristic and also effects the line-length equalization characteristics and the line current at which the loudspeaker amplifier is switched on Unregulated supply voltage for peripheral circuits (voice switch), limited to typically 7V Output of loudspeaker amplifier Unregulated supply voltage for micorcontroller, limited to 6.3V Regulated supply voltage of 3.3V for peripheral circuits (especially microprocessors), minimum output current: 2 mA (ringing) 4 mA (speech mode) Output for driving external switching transistor 40-kHz oscillator for ringing power converter Input for ringing signal protected by internal Zener diode Threshold adjustment for ringing frequency detector Output of ringing frequency detector Line detect; output is low when the line current is more than 15 mA Control input for selection of line impedance 1. 600 2. 900 3. Mute of second transmit stage (TXA); also used for indication of external supply (answering machine); last chosen impedance is stored Time constant of anti-clipping of speaker amplifier Current input for setting the gain of the speaker amplifier, adjustment characteristic is logarithmical, or RGSA > 2 M, the speaker amplifier is switched off Speaker amplifier input (for loudspeaker, tone ringer and hands-free use) Three-state input of transmit mute: 1. Speech condition; inputs MIC1/MIC2 active 2. DTMF condition; input DTMF active. A part of the input signal is passed to the receiving amplifier as a confidence signal during dialing 3. Input DTMF used for answering machine and hands-free use; receive branch not affected Attenuation of acoustical feedback suppression, maximum attenuation of AFS circuit is set by a resistor at this pin, without the resistor, AFS is switched off Input of transmit level detector Input of receive level detector Time constant of transmit level detector
21
IMPSEL
22 23 24
TSACL GSA SA I
25
MUTX
26 27 28 29
ATAFS INLDT INLDR TLDT
5
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Table 2-1.
Pin 30 31 32 33
Pin Description (Continued)
Symbol TLDR AGA IREF STO Function Time constant of receive level detector Automatic gain adjustment with line current, a resistor connected from this pin to GND sets the starting point, maximum gain change: 6 dB. Internal reference current generation; RREF = 62 k; IREF = 20 A Sidetone reduction output Output resistance approximate: 300, Maximum load impedance: 10 k. Reference node for microphone-earphone and loudspeaker amplifier, supply for electret microphone (IM 700 mA) Three-state mute input 1. Normal operation 2. Mute for ear piece 3. Mute for RECIN signal Condition of earpiece mute is stored Inverting output of receiving amplifier Input for sidetone network (short loop) or for answering machine Input for sidetone network (long loop) Input of receiving amplifier for AC coupling in feedback path Output of receiving amplifier A resistor connected from this pin to GND sets the receiving amplification of the circuit; amplifier RA1 can be muted by applying VMP to GR Time constant of anti-clipping in transmit path Input of receiving path; input impedance is typically 80 k Input of intermediate transmit stage, input resistance is typically 20 k
34
VM
35
MUTR
36 37 38 39 40 41 42 43 44 Note:
RECO2 STIS STIL RAC RECO1 GR TTXA RECIN TXIN
Filters against electromagnetic interference (EMI) are located at following pins: MIC1, MIC2, RECIN, TXIN, STIS, STIL and RAC.
3. DC Line Interface and Supply-voltage Generation
The DC line interface consists of an electronic inductance and a dual-port output stage which charges the capacitors at VMPS and VB. The value of the equivalent inductance is given by: L = RSENSE x CIND x ((RDC x R30)/(RDC + R30)) In order to improve the supply during worst-case operating conditions, two PNP current sources - IBOPT and IMPSOPT - hand an extra amount of current to the supply voltages when the NPNs in parallel are unable to conduct current. A flowchart for the control of the current sources (Figure 3-2) shows how a priority for supply VMPS is achieved.
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Figure 3-1. DC Line Interface with Electronic Inductance and Generation of a Regulated and an Unregulated Supply
VL 10 SENSE RSENSE CIND 10 F IND RDC + R30 30 k = VOFFS + + 7.0V = 3.3V VMP 3.3V/ 2 mA 47 F 470 F IBOPT < 5 mA IMPSOPT < 5 mA 6.3V VMPS
VB
220 F
Figure 3-2.
Supply Capacitors CMPS and CB Are Charged with Priority on CMPS
Y
VSENSE - VMPS > 200 mV
VMPS < 6.3V
N
N
Y
VSENSE - VB > 200 mV
N
IMPSOPT = 0 IBOPT = 0
Y
VB < 6.3V
N
Y Charge CMPS (IMPSOPT) Charge CB (IBOPT) Reduce IBOPT (IMPSOPT = 0)
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Figure 3-3.
Supply of Functional Blocks Controlled by Input Voltages VL, VB, VRING and by Logic Inputs PD and IMPSEL
VRING
RPC Voltage regulator
VB 7V VMP
VMPS VL
Power supply Voltage regulator
6.3V
QS PD
ES IMPED CONTR
LIDET
IMPSEL
LIDET
VLON
RFDO
RFD
TXA TXACL
OFFSA COMP
SAI,SA SACL
AFS
MIC, DTMF AGA, RA1, RA2 TX MUTE MUT REC, STBAL RECATT
The U4090B-P contains two identical series regulators which provide a supply voltage VMP of 3.3V suitable for a microprocessor. In speech mode, both regulators are active because VMPS and VB are charged simultaneously by the DC-line interface. Output current is 4 mA. The capacitor at V MPS is used to provide the microcomputer with sufficient power during long-line interruptions. Thus, long flash pulses can be bridged or an LCD display can be turned on for more than 2 seconds after going on hook. When the system is in ringing mode, VB is charged by the on-chip ringing power converter. In this mode only one regulator is used to supply VMP with a maximum of 2 mA.
3.1
Supply Structure of the Chip
A major benefit of the chip is that it uses a very flexible supply structure which allows simple realization of numerous applications such as: * Group listening phone * Hands-free phone * Ringing with the built in speaker amplifier * Answering machine with external supply The special supply topology for the various functional blocks is illustrated in Figure 3-3.
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There are four major supply states: 1. Speech condition: In speech condition the system is supplied by the line current. If the LIDET-block detects a line voltage above the fixed threshold (1.9 V), the internal signal VLON is activated, thus switching off RFD and RPC and switching on all other blocks of the chip. At line voltages below 1.9V, the switches remain in their quiescent state as shown in Figure 3-4 on page 10. OFFSACOMP disables the group listening feature (SAI, SA, SACL, AFS) below line currents of approximately 10 mA. 2. Power down (pulse dialing): When the chip is in power-down mode (PD = high), e.g., during pulse dialing, the internal switch QS shorts the line and all amplifiers are switched off. In this condition, LIDET, voltage regulators and IMPED CONTR are the only active blocks. 3. Ringing: During ringing, the supply for the system is fed into VB via the ringing power converter (RPC). The only functional amplifiers are in the speaker amplifier section (SAI, SA, SACL). 4. External supply: In an answering machine, the chip is powered by an external supply via pin VB. This application allows the possibility to activate all amplifiers (except the transmit line interface TXA). Selecting IMPSEL = high impedance activates all switches at the ES line.
3.2
Acoustic Feedback Suppression
Acoustical feedback from the loudspeaker to the handset microphone may cause instability in the system. The U4090B-P offers a very efficient feedback suppression circuit, which uses a modified voice switch topology. Figure 3-4 on page 10 shows the basic system configuration. Two attenuators (TX ATT and RX ATT) reduce the critical loop gain by introducing an externally adjustable amount of loss either in the transmit or in the receive path. The sliding control in block ATT CONTR determines, whether the TX or the RX signal has to be attenuated. The overall loop gain remains constant under all operating conditions. Selection of the active channel is made by comparison of the logarithmically compressed TXand RX- envelope curve. The system configuration for group listening, which is realized in the U4090B-P, is illustrated in Figure 3-6 on page 11. TXA and SAI represent the two attenuators, the logarithmic envelope detectors are shown in a simplified way (operational amplifiers with two diodes).
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Figure 3-4.
Basic Voice Switch System
TX Att Handset microphone Log Hybrid Att contr Line
Log
Loudspeaker
RX Att
Figure 3-5.
Integration of the Acoustic Feedback Suppression Circuit into the Speech Circuit Environment
VL GT MICO TIN INLDT TLDT STO VL
ZL
VBG
+
TXA Zint
SAO
AFS control Max att.
AGA
GSA SAI SAI TLDR + VBG RECIN RECO1 GR STIS STO STN
INLDR
10
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Figure 3-6. Acoustic Feedback Suppression by Alternative Control of Transmit and Speaker Amplifier Gain
TLDT TXA SAI
TX
RLDT INLDT AGA RLDR INLDR IAT IATAFS IATGSA TLDR RATAFS ATAFS GSA IAGAFS IGSA AGA
RX
A detailed diagram of the AFS (acoustic feedback suppression) is given in Figure 3-6. Receive and transmit signals are first processed by logarithmic rectifiers in order to produce the envelopes of the speech at TLDT and RLDT. After amplification, a decision is made by the differential pair which direction should be transmitted. The attenuation of the controlled amplifiers TXA and SAI is determined by the emitter current IAT which consists of three parts:
IATAS IATGSA IAGAFS
sets maximum attenuation decreases the attenuation when speaker amplifier gain is reduced decreases the attenuation according to the loop gain reduction caused by the AGA function
IAT = IATAFS - IATGSA - IAGAFS G = IAT x 0.67 dB/A Figure 3-7 on page 12 illustrates the principle relationship between speaker amplifier gain (GSA) and attenuation of AFS (ATAFS). Both parameters can be adjusted independently, but the internal coupling between them has to be considered. The maximum usable value of GSA is 36 dB. The shape of the characteristic is moved in the x-direction by adjusting resistor RATAFS, thus changing ATAFSm. The actual value of attenuation (ATAFSa), however, can be determined by reading the value which belongs to the actual gain GSA a . If the speaker amplifier gain is reduced, the attenuation of AFS is automatically reduced by the same amount in order to achieve a constant loop gain. Zero attenuation is set for speaker gains GSA GSA0 = 36 dB - ATAFSm.
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Figure 3-7.
Reducing Speaker Amplifier Gain Results in an Equal Reduction of AFS Attenuation
ATAFS (dB) ATAFSm ATAFSa RATAFS RATAFS not usable
GSAo
GSAa
36 dB GSA (dB)
Figure 3-8.
Line Detection with Two Comparators for Speech Mode and Pulse Dialing
IL
LIDET
PD
3.3
Line Detection (LIDET)
The line current supervision is active under all operating conditions of the U4090B-P. In speech mode (PD = inactive), the line-current comparator uses the same thresholds as the comparator for switching off the entire speaker amplifier. The basic behavior is illustrated in Figure 3-9 on page 13. Actual values of ILON/ILOFF vary slightly with the adjustment of the DC characteristics and the selection of the internal line impedance. When Power Down is activated (during pulse dialing), the entire line current flows through the short-circuiting transistor QS (see Figure 3-3 on page 8). As long as IL is above typically 1.6 mA, output LIDET is low. This comparator does not use hysteresis.
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Figure 3-9. Line Detection in Speech Mode with Hysteresis
LIDET
ILOFF
ILON
IL
3.4
Ringing Power Converter (RPC)
The RPC transforms the input power at VRING (high voltage/low current) into an equivalent output power at V B (low voltage/high current) which is capable of driving the low-ohmic loudspeaker. Input impedance at VRING is fixed at 5 k and the efficiency of the step-down converter is approximate 65%. Figure 3-10. Comparator Thresholds Depending on DC Mask and Line Impedance
7 RDC = 6 VL (V) RDC = 130 k 5
4
RDC = 68 k
3 10 12 14 16 18 20 IL (mA) = ILON at line impedance = 600 = ILOFF = ILON at line impedance = 900 = ILOFF
3.5
Ringing Frequency Detector (RFD)
The U4090B-P offers an output signal for the microcontroller, which is a digital representation of the double ringing frequency. It is generated by a current comparator with hysteresis. The input voltage VRING is transformed into a current via RTHA. The thresholds are 8 A and 24 A. RFDO and VRING are in phase. A second comparator with hysteresis is used to enable the output RFDO as long as the supply voltage for the microprocessor VMP is above 2.0V.
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4. Absolute Maximum Ratings
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Parameters Line current DC line voltage Maximum input current, pin 17 Junction temperature Ambient temperature Storage temperature Total power dissipation, Tamb = 60C Symbol IL VL IRING Tj Tamb Tstg Ptot Value 140 12 15 125 -25 to +75 -55 to +150 0.9 Unit mA V mA C C C W
5. Thermal Resistance
Parameters Junction ambient SSO44 Symbol RthJA Value 70 Unit K/W
6. Electrical Characteristics
f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 k, Tamb = 25C, RGSA = 560 k, Zear = 68 nF + 100, ZM = 68 nF, pin 31 open, VIMPSEL = GND, VMUTX = GND, VMUTR = GND, unless otherwise specified. Parameters DC Characteristics IL = 2 mA IL = 14 mA IL = 60 mA IL = 100 mA 4.6 8.8 GT RGT = 12 k RGT = 27 k IL 14 mA f = 300 to 3400 Hz Pin 31 open IL = 14 to 100 mA Tamb = -10 to +60 C RGT = 12 k RGT = 27 k IL > 14 mA VL = 700 mVrms IL > 19 mA, d < 5% VMIC = 25 mV CTXA = 1 F IMPSEL = open RGT = 12 k GT GT GT GT CMRR Ri dt VLmax VMICOmax 1.8 3 60 45 80 50 75 110 2 40 47 39.8 2.4 5.0 7.5 9.4 45 48 5.4 10.0 50 49 41.8 0.5 0.5 0.5 dB dB dB dB dB dB k % Test Conditions Symbol Min. Typ. Max. Unit
DC voltage drop over circuit
VL
V
Transmission Amplifier, IL = 14 mA, VMIC = 2 mV, RGT = 27 k, Unless Otherwise Specified Range of transmit gain Transmitting amplification Frequency response Gain change with current Gain deviation CMRR of microphone amplifier Input resistance of MIC amplifier Distortion at line
4.2
dBm
Maximum output voltage
-5.2
dBm
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6. Electrical Characteristics (Continued)
f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 k, Tamb = 25C, RGSA = 560 k, Zear = 68 nF + 100, ZM = 68 nF, pin 31 open, VIMPSEL = GND, VMUTX = GND, VMUTR = GND, unless otherwise specified. Parameters Noise at line psophometrically weighted Anti-clipping attack time release time Test Conditions IL > 14 mA GT = 48 dB CTXA = 1 F each 3 dB overdrive IL = 10 mA IMP = 1 mA RDC = 68 k VMIC = 1 mV IM = 300 A IL = 10 mA IM = 300 A IMP = 1 mA RDC = 68 k VMIC = 10 mV IL = 100 mA RAGA = 20 k IL 14 mA MUTX = open IMPSEL = open Symbol no Min. Typ. -80 0.5 9 Max. -72 Unit dBmp ms
Gain at low operating current
GT
40
42.5
dB
Distortion at low operating current
dt
5
%
Line loss compensation Mute suppression a) MIC muted (microphone preamplifier) b) TXA muted (second stage)
GTI GTM GTTX
-6.4 60 60
-5.8 80
-5.2
dB dB dB
Receiving Amplifier, IL = 14 mA, RGR = 62 k, Unless Otherwise Specified, VGEN = 300 mV Adjustment range of receiving gain Receiving amplification Amplification of DTMF signal from DTMF IN to RECO 1, 2 Frequency response Gain change with current Gain deviation Ear-protection differential MUTE suppression a) RECATT b) RA2 c) DTMF operation Output voltage d 2% differential Maximum output current d 2% Receiving noise psophometrically weighted Output resistance Line loss compensation IL 14 mA, single ended differential MUTR = GND RGR = 62 k differential RGR = 22 k differential IL 14 mA VMUTX = VMP IL > 14 mA, f = 300 to 3400 Hz IL = 14 to 100 mA Tamb = -10 to +60C IL 14 mA, VGEN = 11 Vrms IL 14 mA MUTR = open VMUTR = VMP VMUTX = VMP IL = 14 mA, Zear = 68 nF + 100 Zear = 100 Zear = 68 nF + 100 IL 14 mA Each output against GND RAGA = 20 k, IL = 100 mA ni Ro GRI -7.0 -6.0 GR GR GRM GRF GR GR EP GR -8 -2 -1.75 -1 7.5 10 +2 +8 -0.25 dB dB dB dB dB dB Vrms dB
7
13 0.5 0.5 0.5 2.2
60
0.775 4 -80 -77 10 -5.0
Vrms mA (peak) dBmp dB
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6. Electrical Characteristics (Continued)
f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 k, Tamb = 25C, RGSA = 560 k, Zear = 68 nF + 100, ZM = 68 nF, pin 31 open, VIMPSEL = GND, VMUTX = GND, VMUTR = GND, unless otherwise specified. Parameters Test Conditions IL = 10 mA IMP = 1 mA IM = 300 A VGEN = 560 mV RDC = 68 k VIMPSEL = GND VIMPSEL = VMP IL = 10 mA IMP = 1 mA VGEN = 560 mV RDC = 68 k No AC signal Pin 24 VSAI = 3 mV IL = 15 mA RGSA = 560 k RGSA = 20 k Load resistance RL = 50, d < 5% VSAI = 20 mV IL = 15 mA IL = 20 mA IL > 15 mA IL = 15 mA, Tamb = -10 to +60 C IL = 15 mA VL = 0 dBm VSAI = 4 mV Pin 23 open IL = 15 to 100 mA IL = 15 to 100 mA IL = 15 mA, f = 300 to 3400 Hz 20 dB over drive Symbol Min. Typ. Max. Unit
Gain at low operating current
GR
-2
-1
0
dB
AC impedance
Zimp Zimp dR
570 840
600 900
640 960
%
Distortion at low operating current
5
Speaker Amplifier Minimum line current for operation Input resistance ILmin 14 15 22 mA k
Gain from SAI to SAO
GSA
35.5
36.5 -3
37.5
dB
Output power
mW PSA PSA nSA GSA VSAO GSA RGSA GSA tr tf 5 80 40 40.7 41.7 50 42.7 0.5 60 26 180 70 300 130 2 0.8 1.3 3 7 20 200 1 Vpsoph dB
Output noise (Input SAI open) psophometrically weighted Gain deviation
Mute suppression
-60
dBm
Gain change with current Resistor for turning off speaker amplifier Gain change with frequency Attack time of anti-clipping Release time of anti-clipping
1 2 0.5
dB M dB ms ms dB dB dB k %
DTMF Amplifier Test Conditions: IMP = 2 mA, IM = 0.3 mA, VMUTX = VMP Adjustment range of DTMF gain DTMF amplification Gain deviation Input resistance Distortion of DTMF signal IL = 15 mA mute active IL = 15 mA VDTMF = 8 mV Mute active: MUTX = VMP IL = 15 mA, Tamb = -10 to +60C RGT = 27 k RGT = 15 k IL 15 mA VL = 0 dBm GD GD GD Ri dD
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6. Electrical Characteristics (Continued)
f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 k, Tamb = 25C, RGSA = 560 k, Zear = 68 nF + 100, ZM = 68 nF, pin 31 open, VIMPSEL = GND, VMUTX = GND, VMUTR = GND, unless otherwise specified. Parameters Gain deviation with current Adjustment range of attenuation Test Conditions IL = 15 to 100 mA IL 15 mA IL 15 mA IINLDT = 0 A RATAFS = 30 k IINLDR = 10 A IL 15 mA IINLDP = 0 A RATAFS = 30 k IINLDR = 10 A IL 15 mA IL = 14 mA RDC = 68 k IMP = 2 mA IL = 100 mA RDC = infinite IMP = 0 mA IL 14 mA IM = 700 A RDC = 130 k IB = 20 mA IL = 0 mA VRING = 20.6V RFDO: low to high VHYST = VRINGON - VRINGOFF VRING = 30V f = 300 Hz to 3400 Hz IL > 15 mA VRING = 20V + 1.5Vrms VRING = 0V VB = 4V VRING = 25V VRING = 25V, RFDO high IRING = 25 mA VMUTR = GND IL > 14 mA VMUTR = VMP Mute low; IL > 14 mA MUTR input voltage Mute high; IL > 14 mA GT Symbol GD 0 Min. Typ. Max. 0.5 50 Unit dB dB
AFS Acoustic Feedback Suppression
Attenuation of transmit gain
45
dB
Attenuation of speaker amplifier
GSA VATAFS 1.5
50
dB
AFS disable
V
Supply Voltages, VMIC = 25 mV, Tamb = -10 to +60C VMP VMP 3.1 3.3 3.5 V
VMPS
VMPS
6.7
V
VM VB
VM VB
1.3
3.3
V
7
7.6
V
Ringing Power Converter, IMP = 1 mA, IM = 0 Maximum output power Threshold of ring frequency detector Input impedance Input impedance in speech mode PSA VRINGON VHYST RRING RRINGSP VRFDO VMPON VRINGmax 1.8 30.8 -20 IMUTE +10 VMUTE VMUTE VMP - 0.3V 0.3 V V 4 150 0 VMP 2.0 2.2 33.3 -30 A 20 17.5 11.0 5 6 mW V k k
Logic level of frequency detector Ring detector enable Zener diode voltage MUTR Input MUTR input current
V V V
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6. Electrical Characteristics (Continued)
f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 k, Tamb = 25C, RGSA = 560 k, Zear = 68 nF + 100, ZM = 68 nF, pin 31 open, VIMPSEL = GND, VMUTX = GND, VMUTR = GND, unless otherwise specified. Parameters PD Input PD input current Input voltage Voltage drop at VL Input Characteristics of IMPSEL Input current IL 14 mA VIMPSEL = VMP VIMPSEL = GND Input high Input low MUTX Input Input current VMUTX = VMP VMUTX = GND Input high Input low Line Detection Line current for LIDET active Line current for LIDET inactive Current threshold during power down PD = inactive PD = inactive VB = 5V, PD = active ILON ILOFF ILONPD 0.8 12.6 11.0 1.6 2.4 mA mA mA IMUTX IMUTX VMUTX VMUTX VMP - 0.3V 0.3 20 -20 30 -30 A A V V IIMPSEL IIMPSEL VIMPSEL VIMPSEL VMP - 0.3V 0.3 18 -18 A A V V PD active, IL > 14 mA VPD = VMP PD = active PD = inactive IL = 14 mA, PD = active IL = 100 mA, PD = active Ipd Vpd Vpd VL 2 0.3 1.5 1.9 9 A V V Test Conditions Symbol Min. Typ. Max. Unit
Input voltage
Input voltage
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7. U4090B-P Control
Table 7-1.
Logic Level 0
Selection of TX Mute and Line Impedance
IMPSEL Line impedance = 600 TXA = on ES = off Line impedance = 600 TXA = off ES = on Line impedance = 900 TXA = off ES = on Line impedance = 900 TXA = on ES = off MODE Speech
0 to Z
Transmit-mute
1 to Z
Transmit-mute
1
Speech
Table 7-2.
Logic Level 0
Selection of Earpiece Mute and Answering Machine Mode
MUTR RA2 = on RECATT = on STIS + STIL = on RA2 = on RECATT = off STIS = on, STIL = off RA2 = off RECATT = off STIS = on, STIL = off AGA off for STIS RA2 = off RECATT = on STIS + STIL = on MODE Speech
0 to Z
For answering machine
1 to Z
For answering machine
1
Speech + earpeace mute
Table 7-3.
Logic Level
Selection of Transmit Mute
MUTX MIC 1/2 transmit enabled receive enable AFS = on AGA = on TXACL = on DTMF transmit enabled receive enable AFS = on AGA = on TXACL = on DTMF transmit enabled DTMF to receive enable AFS = off AGA = off TXACL = off MODE
0
Speech
Z
For answering machine
1
DTMF dialling
19
4741C-CORD-11/05
Table 7-4.
Logic Level
Specification of Logic Levels
0 = < (0.3V) Z = > (1V) < (VMP - 1V) or (open input) 1 = > (VMP - 0.3V)
8. Explanation of Abbreviations
RECATT = Receive attenuation STIS, STIL = Inputs of sidetone balancing amplifiers ES = External supply AFS = Acoustic feedback suppression control AGA = Automatic gain adjustment RA2 = Inverting receive amplifier TXACL = Transmit anti-clipping control Figure 8-1. Typical DC Characteristic
12 RDC = infinity 10
8 RDC = 68k
VL (V)
6
4 RDC = 130k 2
0 0 10 20 30 40 50 60 70 80 90 100
IL (mA)
Figure 8-2.
Typical Adjustment Range of Transmit Gain
53 51 49 47
GT (dB)
45 43 41 39 37 35 0 5 10 15 20 25 30 35 40
RGT (k)
20
U4090B-P
4741C-CORD-11/05
U4090B-P
Figure 8-3. Typical Adjustment Range of Receive Gain (Differential Output)
10 8 6 4 2 0 -2 -4 0 10 20 30 40 50 60 70 80
GR (dB)
RGR (k)
Figure 8-4.
Typical AGA Characteristic
0 -1 -2 RAGA = 24k -3 -4 RAGA = 16k -5 -6 RAGA = 20k -7 0 10 20 30 40 50 60 70 80 90 100
AGA (dB)
IL (mA)
Figure 8-5.
Typical Load Characteristic of VB for a Maximum (RDC = Infinity) DC-characteristic and 3-mW Loudspeaker Output
6.0
5.0
4.0
VB (V)
3.0
IL = 15 mA
IL = 20 mA
IL = 30 mA
2.0
1.0
0 0 2 4 6 8 10 12 14 16 18
IB (mA) RDC = Infinity; VI = 200 mV/1 kHz; PSAO = 3 mW; IMP = 2 mA; IM = 300 A; RGSA = 560k
21
4741C-CORD-11/05
Figure 8-6.
Typical Load Characteristic of VB for a Medium DC-characteristic (RDC = 130 k) and 3-mW Loudspeaker Output
5.0 4.5 4.0 3.5
VB(V)
3.0 2.5 2.0 1.5 1.0 0.5 0 0
IL = 15 mA
IL = 20 mA
IL = 30 mA
2
4
6
8
10
12
14
16
18
IB (mA) RDC = 130 k; VI = 200 mV/1 kHz; PSAO = 3 mW; IMP = 2 mA; IM = 300 A; RGSA = 560k
Figure 8-7.
Typical Load Characteristic of VB for a Minimum DC-characteristic (RDC = 68 k) and 3-mW Loudspeaker Output
4.5 4.0 3.5 3.0 IL = 15 mA IL = 20 mA IL = 30 mA
VB (V)
2.5 2.0 1.5 1.0 0.5 0 0 2 4 6 8 10 12 14 16 18
IB (mA) RDC = 68 k, VI = 200 mV, PSAO = 3 mW; IMP = 2 mA; IM = 300 A; RGSA = 560k
22
U4090B-P
4741C-CORD-11/05
Figure 8-8.
4741C-CORD-11/05
VM VM 47 nF 36 k 36 k VMP open 47 nF 3 k VMP open RGR 1 F IM ZEAR 100 F 10 F 33 32 31 30 29 28 10 F 3.3 nF 62 k 3.3 nF 27 26 25 24 23 2 M RGSA 10 F 3 k VM
Basic Test Circuit
Mico
VL
220 nF
150 nF
44
43
42
41
40
39
38
37
36
35
34
U4090B-P
3 4 5 6 7 8 9 10 11 12 13 14 15 16 68 nF 47 F 17 18 19 20 21 22
1
2
RGT 10 F 68 nF 600 4.7 nF RDC S1 22 F 50 10
1 k
47 F
1000 F
680 k
1 F
IMP BC556 IDC S2 open VRING 2.2 mH IL 220 F SD103A DC VMP
VM
Reference figure for not connected pins
S1 = closed: speech mode
S2 = closed: ringer mode
U4090B-P
23
Figure 8-9.
24
VM 10 F RGR RAGA IM 62 k ZEAR 100 F 30 k RGSA 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23
U4090B-P
U4090B-P
4 68 nF 10 F 10 220 F 1000 F 47 F 5 6 7 8 9 10 11 12 13 14 15 IMP VLIDET V 1 mF 16 17 18 19 20 21 22
Mico
VL
220 nF
150 nF
1 F
44
43
42
Test Circuit for DC Characteristics and Line Detection
1
2
3
RGT
4.7 nF b IB RDC IL VL V DC a VB S1
VMIC VMP
open
Line detection: S1a
VB (external supply): S1b
Open pins should be connected as shown in Figure 8-14
4741C-CORD-11/05
4741C-CORD-11/05
open VM open VMP RGR 100 F ZEAR S3 41 40 38 37 36 35 33 32 31 29 28 27 26 30 34 39 25 24 23 IM 62 k RAGA 10 F VMP
Mico
VL
220 nF
150 nF
1 F
44
43
42
Figure 8-10. Test Circuit for Transmission Amplifier
U4090B-P
4 5 7 8 9 11 12 13 14 16 IMP 15 10 68 nF 1000 F 47 F S1 220 F 22 F b S2 4.7 nF 25 k RDC IL Transmitting amplification GT = 20 x log V mic VCM 600 S1 V a 22 F VL, dt, n o VL Vmic Line loss compensation: GTI = GT (at IL = 100 mA) - GT (at IL = 14 mA), S3 = closed a 10 1 F VMP open 6 17 18 19 20 21 22
1
2
3
VMICO
V
RGT
max
25 k
AC
Gain change with current: GTI = GT (at IL = 100 mA) - GT (at IL = 14 mA) 50 k Input resistance: Ri = VL (S2 = closed) -1 VL (S2 = open) VCM Common mode rejection ratio: CMRR = 20 log VL Mute suppression: GTM = 20 x log VL (at MUTX = low) VL (at MUTX = open) GTTX = 20 x log VL (at IMPSEL = low) VL (at IMPSEL = open) Open pins should be connected as shown in Figure 8-14 + GT with S1b, S2 = closed, S3 = open
b
1 F
U4090B-P
25
Figure 8-11. Test Circuit for Receiving Amplifier
26
open VM V MP V MP open 10 F RGR RAGA IM 62 k S3 ZEAR VZEAR, dr 100 F 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23
Mico
VL
U4090B-P
U4090B-P
4 68 nF 220 F 47 F 10 F V DTMF 4.7 nF V V LR 600 22 F S1 b Receiving noise: S1a V GEN AC Receive amplification: GR = 20 x log ( VZEAR/VLR) dB (S1 = b, S2 open) DTMF-control signal: GRM = 20 x log (VZEAR/VDTMF) dB (S1 =a, S2 = closed) AC-impedance: (VLR/(VGEN - VLR)) x ZL Mute suppression: a) RECATT: GR = 20 x log (VLR/VZEAR) dB +GR, MUTR = open b) RA2: GR = 20 x log (VLR/VZEAR) dB + GR, MUTR = VMP c) DT MF operation: GR = 20 x log VLR/VZEAR) dB + GR, MUTX = VMP Open pins should be connected as shown in Figure 8-14 a Line loss compensation: GRI = GR (at IL = 100 mA) - GR (at IL = 14 mA), S3 = closed RDC V IL V MP 10 1000 F I MP 1 F 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 open
220 nF
150 nF 1 F
44
43
42
1
2
3
RGT
220 nF
1 k
S2
VM
4741C-CORD-11/05
4741C-CORD-11/05
30 k VM I INLDR I INLDT 220 nF V SAI V VATAFS RGR ZEAR 10 F 10 F off S4 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 10 F 62 k RGSA 20 k
Mico
220 nF
150 nF
1 F
Figure 8-12. Test Circuit for Speaker Amplifier
44
43
U4090B-P
3 68 nF 10 F 220 F RDC 10 47 F V MIC 22 F 4.7 nF VL 600 V IL V VSAO, S4 = closed VZIN, S4 = open n SA 50 1000 F 47 F I MP V LIDET V 1 F S1 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
1
2
RGT
Input impedance: (VZIN/(VSAO - VZIN)) x RIN
Gain from SAI to SAO: 20 x log (VSAO/VSAI) dB VSAO RSAO
2
Output power: PSA =
Attenuation of transmit gain: S1 = closed
Open pins should be connected as shown in Figure 8-14
U4090B-P
27
Figure 8-13. Test Circuit for DTMF Amplifier
28
open VM V MP RGR ZEAR IM 10 F 100 F 62 k 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23
U4090B-P
U4090B-P
4 68 nF 220 F 1000 F 47 F 10 10 F V DTMF V RDC 4.7 nF V dD IL VL: S3 = closed VL 50 k: S3 = open DTMF-amplifier: 20log (VL/VDTMF) dB Input resistance: (VL50K/(VL - VL50k)) x 50 k Open pins should be connected as shown in Figure 8-14 I MP 1 F 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
Mico
VL
220 nF
150 nF
1 F
44
43
42
41
1
2
3
RGT
220 nF
1 k
VM
S3
50 k
V GEN3
AC
4741C-CORD-11/05
4741C-CORD-11/05
PSA = RRING = IRING RRINGSP = Vring (S1 = closed ) Iring VSAI 1.8 Vpp 1 kHz (S 3 = closed) VRING 100 nF 100 F 62 k RGSA 41 40 38 35 32 30 29 31 34 33 37 36 39 28 27 26 25 24 23
1) Max. output power:
Vsao 2 (S 4 closed) RSAO 2) Threshold of ringing frequency detector: detecting VRFDO, when driving VRING from 2V to 22V (VRINGON)
and back again (VRINGOFF) (S2 = closed)
3) Input impedance:
4) Input impedance in speech mode (IL > 15 mA):
5) Ring detector enable: detecting VRFDO, when driving VMP from 0.7V to 3.3V
(VMPON) and back again (VMPOFF) (S5, S3 = closed)
Figure 8-14. Test Circuit for Ringing Power Converter
Open pins should be connected as shown in Figure 8-14
44
43
42
U4090B-P
4 7 10 12 13 11 8 9 5 6 14 47 F 10 F 68 nF V SAO RDC 4.7 nF 50 I MP ramp IL VMP S5 V BC556 I RING V RING 1.5V ramp 20V 220 F 2.2 mH SD103A DC DC DC 20.6V I RING 10 47 F 1000 F 68 nF V RING 15 16 17 680 k V V RFDO 1 F 18 19 20 21 22
1
2
3
S1
S2
S3
S4
U4090B-P
29
Figure 8-15. Test Circuit for Input Characteristics of I/O Ports
30
V MP VM V MP 10 F ZEAR I MUTR IM 35 34 33 32 31 30 29 28 27 26 25 62 k I MUTX 24 23 100 F RGSA 41 40 39 38 37 36
U4090B-P
U4090B-P
4 68 nF I pd 10 10 F 1000 F open 4.7 nF RDC V MP IL V VL V MP V pd 220 F 47 F 5 6 7 8 9 10 11 12 13 14 15 I MP I IMPSEL 16 17 18 19 20 21 22 1 F
RGR
44
43
42
1
2
3
RGT
Open pins should be connected as shown in Figure 8-14
4741C-CORD-11/05
4741C-CORD-11/05
Tip hook switch C2 12V to ST to C 1 3 31 7 C8 34 VM 4 2 C 21 32 42 R6 20 28 17 16 15 Q9 C9 27 C 18 30 29 26 12 C 16 22 C 15 18 24 C 14 C 13 R 14 R 12 R 13 R 11 R 10 STN 2 (Option) Earpeace VM C 12 R9 R8 C 11 ST VM VL Micro controller C 10 23 25 35 40 41 39 36 38 37 43 L1 19 R7 C 17 R 31 6 R5 9 10 11 14 13 8 21 5 44 33 Ring R2 R3 R4 C4 C6 C5 C3 C7 R1 C1
M
R 28
Microphone
DTMF Generator
R 27
Figure 8-16. Application Circuit for Loud-hearing
C 22
RECO
C 20
R 20
MICO
R 19
U4090B-P
C 19
Loud-
speaker
VM
R 17
R 16
R 15
V MP
U4090B-P
31
Figure 8-17. Application for Hands-free Operation
32
hook switch C2 C4 C5 C6 R4 12V to ST to C 1 3 33 C8 34 VM 4 2 C 21 32 42 20 28 17 27 16 15 Q1 C9 30 29 26 12 C 16 22 C 15 24 C 14 R 15 R 14 R 13 R 12 R 11 C 13 R 10 STN 2 (Option) Earpiece VM R9 C 12 R8 C 11 BC177 VM ST LOGTX R 21 Microcontroller V MP VL 23 25 35 36 41 39 40 38 37 43 18 L1 19 R7 R6 6 R5 9 8 44 21 31 7 10 11 14 13 5 Ring Microphone R2 R3 C3 C7 Tip C1 R 26 R1 C 18 C 17
VM
R 25
U4090B-P
U4090B-P
R 18 C 10 VB
DTMF
R 24
C 25
C 23
HF-Mic
C 24
R 23
R 22
RECO
C 27
R 30
R 29
LOGTX
C 26
Loud speaker
VM
R 17
R 16
4741C-CORD-11/05
U4090B-P
Table 8-1.
Name C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15
Typical Values of External Components (Figure 8-16 on page 31 and Figure 8-17 on page 32)
Value 100 nF 4.7 nF 10 F 220 F 47 F 470 F 820 nF 100 F 100 nF 150 nF 86 nF 33 nF 10 F 100 nF 1 F Name C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 L1 R1 R2 Value 47 F 10 F 10 F 68 nF 68 nF 1 F 100 nF 6.8 nF 10 nF 100 nF 470 nF 33 nF 2.2 mH 27 k 20 k Name R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 Value > 68 k 10 k 1.5 k 62 k 680 k 22 k 330 k 3 k 62 k 30 k 62 k 120 k 47 k 1 k 1.2 k Name R18 R19 R20 R21 R22 R23 R24 R25 R26 R27 R28 R29 R30 R31 Value 30 k 6.8 k 6.8 k 15 k 330 k 220 k 68 k 2 k 3.3 k 18 k 2 k 1 k 12 k 56 k
33
4741C-CORD-11/05
9. Ordering Information
Extended Type Number U4090B-PFNY U4090B-PFNG3Y T4090B-PC Package SSO44 SSO44 Die Remarks Pb-free Taped and reeled, Pb-free Chip on foil
10. Package Information
Package SSO44
Dimensions in mm
18.05 17.80 9.15 8.65 7.50 7.30
2.35 0.3 0.8 16.8 44 23 0.25 0.10
0.25 10.50 10.20
technical drawings according to DIN specifications
1
22
34
U4090B-P
4741C-CORD-11/05
Atmel Corporation
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4741C-CORD-11/05

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