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. 2 Block Diagram Speech circuit Audio amplifier Voice switch Tone ringer Loudhearing and Tone ringing MC with EEPROM/ DTMF U4090B-P 4741C–CORD–11/05 4741C–CORD–11/05 SAI TSACL SAO ATAFS TLDT TLDR INLDT INLDR TTXA DTMF MIC2 MIC1 24 22 12 26 29 30 27 28 42 2 MIC TX ACL GSA 23 SAI SACL SA Acoustical feedback suppression control DTMF 4 5 MUTX 25 control 44 MUTR 35 Mute receive control Transmit mute 3 TXA 36 40 41 39 RA1 900Ω Impedance control 21 8 600Ω IMPSEL VL RECO2 RECO1 GR RAC -1 RA2 33 STO BAL ST control AGA 31 AGA STIL 38 + - 7 IND STIS 37 + - Line detect IL VL Receive RECIN 43 supply Current VMP ISupply attenuation QS supply Power 14 11 10 VMP SENSE VB + - - + 13 VMPS 18 19 15 16 17 20 32 6 9 34 THA RFDO SWOUT COSC VRING LIDET IREF PD GND VM Figure 1-2. 1 GT MICO TXIN U4090B-P Detailed Block Diagram 3 2. Pin Configuration Figure 2-1. Pinning SSO44 GT 1 44 TXIN DTMF 2 43 RECIN MICO 3 42 TTXA MIC2 4 41 GR MIC1 5 40 RECO1 PD 6 39 RAC IND 7 38 STIL VL 8 37 STIS GND 9 36 RECO2 SENSE 10 35 MUTR 34 VM SAO 12 33 STO VMPS 13 32 IREF VMP 14 31 AGA SWOUT 15 30 TLDR COSC 16 29 TLDT VRING 17 28 INLDR THA 18 27 INLDT RFDO 19 26 ATAFS LIDET 20 25 MUTX IMPSEL 21 24 SAI TSACL 22 23 GSA VB 11 U4090B-P 4 U4090B-P 4741C–CORD–11/05 U4090B-P Table 2-1. Pin Description Pin Symbol Function 1 GT 2 DTMF Input for DTMF signals, also used for the answering machine and hands-free input 3 MICO Output of microphone preamplifier 4 MIC2 Non-inverting input of microphone amplifier 5 MIC1 Inverting input of microphone amplifier 6 PD Active high input for reducing the current consumption of the circuit, simultaneously VL is shorted by an internal switch 7 IND 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 8 VL Line voltage 9 GND 10 SENSE 11 VB 12 SAO 13 VMPS 14 VMP 15 SWOUT 16 COSC 40-kHz oscillator for ringing power converter 17 VRING Input for ringing signal protected by internal Zener diode 18 THA 19 RFDO Output of ringing frequency detector 20 LIDET Line detect; output is low when the line current is more than 15 mA 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 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 Threshold adjustment for ringing frequency detector 21 IMPSEL Control input for selection of line impedance 1. 600Ω 2. 900Ω 3. Mute of second transmit stage (TXA); also used for indication of external supply (answering machine); last chosen impedance is stored 22 TSACL Time constant of anti-clipping of speaker amplifier 23 GSA Current input for setting the gain of the speaker amplifier, adjustment characteristic is logarithmical, or RGSA > 2 MΩ, the speaker amplifier is switched off 24 SA I Speaker amplifier input (for loudspeaker, tone ringer and hands-free use) 25 MUTX 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 26 ATAFS 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 27 INLDT Input of transmit level detector 28 INLDR Input of receive level detector 29 TLDT Time constant of transmit level detector 5 4741C–CORD–11/05 Table 2-1. Pin Description (Continued) Pin Symbol 30 TLDR Time constant of receive level detector 31 AGA Automatic gain adjustment with line current, a resistor connected from this pin to GND sets the starting point, maximum gain change: 6 dB. 32 IREF Internal reference current generation; RREF = 62 kΩ; IREF = 20 µA 33 STO Sidetone reduction output Output resistance approximate: 300Ω, Maximum load impedance: 10 kΩ. 34 VM Reference node for microphone-earphone and loudspeaker amplifier, supply for electret microphone (IM ≤ 700 mA) Note: Function 35 MUTR Three-state mute input 1. Normal operation 2. Mute for ear piece 3. Mute for RECIN signal Condition of earpiece mute is stored 36 RECO2 Inverting output of receiving amplifier 37 STIS Input for sidetone network (short loop) or for answering machine 38 STIL Input for sidetone network (long loop) 39 RAC Input of receiving amplifier for AC coupling in feedback path 40 RECO1 41 GR 42 TTXA Time constant of anti-clipping in transmit path 43 RECIN Input of receiving path; input impedance is typically 80 kΩ 44 TXIN 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 Input of intermediate transmit stage, input resistance is typically 20 kΩ 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 × CIND × ((RDC × 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. 6 U4090B-P 4741C–CORD–11/05 U4090B-P Figure 3-1. DC Line Interface with Electronic Inductance and Generation of a Regulated and an Unregulated Supply VL 10Ω SENSE RSENSE IMPSOPT < 5 mA IBOPT < 5 mA CIND VMPS 6.3V 10 µF IND RDC Figure 3-2. VMP 3.3V R30 30 kΩ = 470 µF = + + - + - VOFFS 7.0V 3.3V/ 2 mA 47 µF VB 220 µF Supply Capacitors CMPS and CB Are Charged with Priority on CMPS Y VMPS < 6.3V Y VSENSE - VMPS > 200 mV N N 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) 7 4741C–CORD–11/05 Figure 3-3. Supply of Functional Blocks Controlled by Input Voltages VL, VB, VRING and by Logic Inputs PD and IMPSEL VRING VB RPC Voltage regulator 7V Voltage regulator 6.3V VMP VMPS Power supply VL QS PD LIDET ES IMPED CONTR IMPSEL LIDET VLON RFD RFDO 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. 8 U4090B-P 4741C–CORD–11/05 U4090B-P 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). 9 4741C–CORD–11/05 Figure 3-4. Basic Voice Switch System TX Att Handset microphone Log Hybrid Line Att contr Log Loudspeaker Figure 3-5. RX Att Integration of the Acoustic Feedback Suppression Circuit into the Speech Circuit Environment VL GT MICO TIN INLDT VBG TLDT + STO VL ZL TXA Zint SAO AFS control Max att. AGA GSA + VBG SAI SAI TLDR INLDR RECIN RECO1 GR STIS STO STN 10 U4090B-P 4741C–CORD–11/05 U4090B-P Figure 3-6. Acoustic Feedback Suppression by Alternative Control of Transmit and Speaker Amplifier Gain TLDT TXA TX SAI RLDT INLDT AGA AGA RX IAGAFS RLDR IAT IGSA IATAFS INLDR IATGSA TLDR ATAFS GSA RATAFS 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 × 0.67 dB/µA 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. 11 4741C–CORD–11/05 Figure 3-7. Reducing Speaker Amplifier Gain Results in an Equal Reduction of AFS Attenuation ATAFS (dB) ATAFSm ATAFSa GSAo Figure 3-8. RATAFS RATAFS GSAa not usable 36 dB GSA (dB) Line Detection with Two Comparators for Speech Mode and Pulse Dialing LIDET IL 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. 12 U4090B-P 4741C–CORD–11/05 U4090B-P Figure 3-9. Line Detection in Speech Mode with Hysteresis LIDET ILOFF 3.4 ILON IL 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 kΩ 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 = ∞ VL (V) 6 RDC = 130 kΩ 5 RDC = 68 kΩ 4 3 10 12 14 16 18 20 IL (mA) = ILON at line impedance = 600Ω = ILOFF = ILON at line impedance = 900Ω = 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 µA and 24 µA. 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. 13 4741C–CORD–11/05 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 Symbol Value Unit Line current IL 140 mA DC line voltage VL 12 V IRING 15 mA Maximum input current, pin 17 Junction temperature Tj 125 °C Ambient temperature Tamb –25 to +75 °C Storage temperature Tstg –55 to +150 °C Total power dissipation, Tamb = 60°C Ptot 0.9 W Symbol Value Unit RthJA 70 K/W 5. Thermal Resistance Parameters Junction ambient SSO44 6. Electrical Characteristics f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 kΩ, Tamb = 25°C, RGSA = 560 kΩ, Zear = 68 nF + 100Ω, ZM = 68 nF, pin 31 open, VIMPSEL = GND, VMUTX = GND, VMUTR = GND, unless otherwise specified. Parameters Test Conditions Symbol Min. Typ. Max. Unit DC Characteristics DC voltage drop over circuit IL = 2 mA IL = 14 mA IL = 60 mA IL = 100 mA 8.8 2.4 5.0 7.5 9.4 10.0 GT 40 45 50 dB GT 47 39.8 48 49 41.8 dB VL 4.6 5.4 V Transmission Amplifier, IL = 14 mA, VMIC = 2 mV, RGT = 27 kΩ, Unless Otherwise Specified Range of transmit gain Transmitting amplification RGT = 12 kΩ RGT = 27 kΩ Frequency response IL ≥ 14 mA f = 300 to 3400 Hz ∆GT ±0.5 dB Gain change with current Pin 31 open IL = 14 to 100 mA ∆GT ±0.5 dB Gain deviation Tamb = –10 to +60° C ∆GT ±0.5 dB CMRR of microphone amplifier CMRR 60 80 45 50 75 Input resistance of MIC amplifier RGT = 12 kΩ RGT = 27 kΩ Ri Distortion at line IL > 14 mA VL = 700 mVrms dt Maximum output voltage IL > 19 mA, d < 5% VMIC = 25 mV CTXA = 1 µF IMPSEL = open RGT = 12 kΩ 14 VLmax VMICOmax 1.8 3 –5.2 dB 110 kΩ 2 % 4.2 dBm dBm U4090B-P 4741C–CORD–11/05 U4090B-P 6. Electrical Characteristics (Continued) f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 kΩ, Tamb = 25°C, RGSA = 560 kΩ, Zear = 68 nF + 100Ω, ZM = 68 nF, pin 31 open, VIMPSEL = GND, VMUTX = GND, VMUTR = GND, unless otherwise specified. Parameters Test Conditions Noise at line psophometrically weighted IL > 14 mA GT = 48 dB Anti-clipping attack time release time CTXA = 1 µF each 3 dB overdrive Gain at low operating current IL = 10 mA IMP = 1 mA RDC = 68 kΩ VMIC = 1 mV IM = 300 µA GT Distortion at low operating current IL = 10 mA IM = 300 µA IMP = 1 mA RDC = 68 kΩ VMIC = 10 mV dt Line loss compensation IL = 100 mA RAGA = 20 kΩ ∆GTI –6.4 –5.8 IL ≥ 14 mA MUTX = open GTM 60 80 IMPSEL = open GTTX 60 Mute suppression a) MIC muted (microphone preamplifier) b) TXA muted (second stage) Symbol Min. no Typ. Max. Unit –80 –72 dBmp 0.5 9 40 ms 42.5 dB 5 % –5.2 dB dB dB Receiving Amplifier, IL = 14 mA, RGR = 62 kΩ, Unless Otherwise Specified, VGEN = 300 mV Adjustment range of receiving gain IL ≥ 14 mA, single ended differential MUTR = GND GR Receiving amplification RGR = 62 kΩ differential RGR = 22 kΩ differential GR Amplification of DTMF signal from DTMF IN to RECO 1, 2 IL ≥ 14 mA VMUTX = VMP GRM Frequency response IL > 14 mA, f = 300 to 3400 Hz Gain change with current –8 –2 +2 +8 dB –1.75 –1 7.5 –0.25 7 10 13 dB ∆GRF ±0.5 dB IL = 14 to 100 mA ∆GR ±0.5 dB Gain deviation Tamb = –10 to +60°C ∆GR ±0.5 dB Ear-protection differential IL ≥ 14 mA, VGEN = 11 Vrms EP 2.2 Vrms MUTE suppression a) RECATT b) RA2 c) DTMF operation IL ≥ 14 mA MUTR = open VMUTR = VMP VMUTX = VMP ∆GR Output voltage d ≤2% differential IL = 14 mA, Zear = 68 nF + 100Ω Maximum output current d ≤2% Zear = 100Ω Receiving noise psophometrically weighted Zear = 68 nF + 100Ω IL ≥ 14 mA ni Output resistance Each output against GND Ro Line loss compensation RAGA = 20 kΩ, IL = 100 mA ∆GRI dB 60 dB 0.775 Vrms 4 mA (peak) –80 –7.0 –6.0 –77 dBmp 10 Ω –5.0 dB 15 4741C–CORD–11/05 6. Electrical Characteristics (Continued) f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 kΩ, Tamb = 25°C, RGSA = 560 kΩ, Zear = 68 nF + 100Ω, ZM = 68 nF, pin 31 open, VIMPSEL = GND, VMUTX = GND, VMUTR = GND, unless otherwise specified. Parameters Test Conditions Symbol Min. Typ. Max. Unit Gain at low operating current IL = 10 mA IMP = 1 mA IM = 300 µA VGEN = 560 mV RDC = 68 kΩ GR –2 –1 0 dB AC impedance VIMPSEL = GND VIMPSEL = VMP Zimp Zimp 570 840 600 900 640 960 Ω Ω Distortion at low operating current IL = 10 mA IMP = 1 mA VGEN = 560 mV RDC = 68 kΩ dR 5 % Minimum line current for operation No AC signal ILmin 15 mA Input resistance Pin 24 22 kΩ Gain from SAI to SAO VSAI = 3 mV IL = 15 mA RGSA = 560 kΩ RGSA = 20 kΩ Output power Load resistance RL = 50Ω, d < 5% VSAI = 20 mV IL = 15 mA IL = 20 mA PSA PSA Output noise (Input SAI open) psophometrically weighted IL > 15 mA nSA 200 µVpsoph Gain deviation IL = 15 mA, Tamb = –10 to +60° C ∆GSA ±1 dB Mute suppression IL = 15 mA VL = 0 dBm VSAI = 4 mV Pin 23 open VSAO –60 dBm Gain change with current IL = 15 to 100 mA ∆GSA ±1 dB Resistor for turning off speaker amplifier IL = 15 to 100 mA RGSA 2 MΩ Gain change with frequency IL = 15 mA, f = 300 to 3400 Hz ∆GSA ±0.5 dB Attack time of anti-clipping 20 dB over drive Speaker Amplifier Release time of anti-clipping 14 GSA 35.5 36.5 –3 3 7 20 37.5 dB mW 0.8 1.3 tr 5 ms tf 80 ms DTMF Amplifier Test Conditions: IMP = 2 mA, IM = 0.3 mA, VMUTX = VMP Adjustment range of DTMF gain IL = 15 mA mute active GD 40 DTMF amplification IL = 15 mA VDTMF = 8 mV Mute active: MUTX = VMP GD 40.7 41.7 Gain deviation IL = 15 mA, Tamb = –10 to +60°C GD Input resistance RGT = 27 kΩ RGT = 15 kΩ Ri 60 26 180 70 Distortion of DTMF signal IL ≥ 15 mA VL = 0 dBm dD 16 50 dB 42.7 dB ±0.5 dB 300 130 kΩ 2 % U4090B-P 4741C–CORD–11/05 U4090B-P 6. Electrical Characteristics (Continued) f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 kΩ, Tamb = 25°C, RGSA = 560 kΩ, Zear = 68 nF + 100Ω, ZM = 68 nF, pin 31 open, VIMPSEL = GND, VMUTX = GND, VMUTR = GND, unless otherwise specified. Parameters Test Conditions Symbol Gain deviation with current IL = 15 to 100 mA ∆GD Min. Typ. Max. Unit ±0.5 dB 50 dB AFS Acoustic Feedback Suppression Adjustment range of attenuation IL ≥ 15 mA Attenuation of transmit gain IL ≥ 15 mA IINLDT = 0 µA RATAFS = 30 kΩ IINLDR = 10 µA ∆GT 45 dB Attenuation of speaker amplifier IL ≥ 15 mA IINLDP = 0 µA RATAFS = 30 kΩ IINLDR = 10 µA ∆GSA 50 dB AFS disable IL ≥ 15 mA VATAFS 1.5 3.1 0 V Supply Voltages, VMIC = 25 mV, Tamb = –10 to +60°C VMP IL = 14 mA RDC = 68 kΩ IMP = 2 mA VMP VMPS IL = 100 mA RDC = infinite IMP = 0 mA VMPS VM IL ≥ 14 mA IM = 700 µA RDC = 130 kΩ VM VB IB = 20 mA IL = 0 mA VB 3.3 1.3 7 3.5 V 6.7 V 3.3 V 7.6 V Ringing Power Converter, IMP = 1 mA, IM = 0 Maximum output power VRING = 20.6V Threshold of ring frequency detector RFDO: low to high VHYST = VRINGON – VRINGOFF PSA 20 mW VRINGON VHYST 17.5 11.0 V Input impedance VRING = 30V Input impedance in speech mode f = 300 Hz to 3400 Hz IL > 15 mA VRING = 20V + 1.5Vrms Logic level of frequency detector VRING = 0V VB = 4V VRING = 25V VRFDO Ring detector enable VRING = 25V, RFDO high VMPON 1.8 Zener diode voltage IRING = 25 mA VRINGmax 30.8 VMUTR = GND IL > 14 mA VMUTR = VMP IMUTE Mute low; IL > 14 mA VMUTE Mute high; IL > 14 mA VMUTE RRING 4 RRINGSP 150 5 6 kΩ kΩ 0 VMP 2.0 V 2.2 V 33.3 V MUTR Input MUTR input current MUTR input voltage –20 –30 µA +10 0.3 VMP – 0.3V V V 17 4741C–CORD–11/05 6. Electrical Characteristics (Continued) f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 kΩ, Tamb = 25°C, RGSA = 560 kΩ, Zear = 68 nF + 100Ω, ZM = 68 nF, pin 31 open, VIMPSEL = GND, VMUTX = GND, VMUTR = GND, unless otherwise specified. Parameters Test Conditions Symbol Min. Typ. Max. Unit PD Input PD input current PD active, IL > 14 mA VPD = VMP Ipd 9 µA Input voltage PD = active PD = inactive Vpd Vpd Voltage drop at VL IL = 14 mA, PD = active IL = 100 mA, PD = active VL 1.5 1.9 V IL ≥ 14 mA VIMPSEL = VMP VIMPSEL = GND IIMPSEL IIMPSEL 18 –18 µA µA Input high VIMPSEL Input low VIMPSEL 2 0.3 V Input Characteristics of IMPSEL Input current Input voltage VMP – 0.3V V 0.3 V 30 –30 µA µA MUTX Input Input current Input voltage VMUTX = VMP VMUTX = GND IMUTX IMUTX Input high VMUTX Input low VMUTX PD = inactive ILON 20 –20 VMP – 0.3V V 0.3 V Line Detection Line current for LIDET active Line current for LIDET inactive PD = inactive Current threshold during power down VB = 5V, PD = active 18 12.6 ILOFF ILONPD mA 11.0 0.8 1.6 mA 2.4 mA U4090B-P 4741C–CORD–11/05 U4090B-P 7. U4090B-P Control Table 7-1. Logic Level Selection of TX Mute and Line Impedance IMPSEL MODE 0 Line impedance = 600Ω TXA = on ES = off Speech 0 to Z Line impedance = 600Ω TXA = off ES = on Transmit-mute 1 to Z Line impedance = 900Ω TXA = off ES = on Transmit-mute 1 Line impedance = 900Ω TXA = on ES = off Speech Table 7-2. Logic Level Selection of Earpiece Mute and Answering Machine Mode MUTR MODE RA2 = on RECATT = on STIS + STIL = on Speech 0 to Z RA2 = on RECATT = off STIS = on, STIL = off For answering machine 1 to Z RA2 = off RECATT = off STIS = on, STIL = off AGA off for STIS For answering machine RA2 = off RECATT = on STIS + STIL = on Speech + earpeace mute 0 1 Table 7-3. Logic Level Selection of Transmit Mute MUTX MODE 0 MIC 1/2 transmit enabled receive enable AFS = on AGA = on TXACL = on Speech Z DTMF transmit enabled receive enable AFS = on AGA = on TXACL = on For answering machine 1 DTMF transmit enabled DTMF to receive enable AFS = off AGA = off TXACL = off DTMF dialling 19 4741C–CORD–11/05 Table 7-4. Specification of Logic Levels Logic Level 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 VL (V) RDC = 68k 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 GT (dB) 47 45 43 41 39 37 35 0 5 10 15 20 25 30 35 40 RGT (kΩ) 20 U4090B-P 4741C–CORD–11/05 U4090B-P Figure 8-3. Typical Adjustment Range of Receive Gain (Differential Output) 10 8 GR (dB) 6 4 2 0 -2 -4 0 10 20 30 40 50 60 70 80 RGR (kΩ) Figure 8-4. Typical AGA Characteristic 0 -1 -2 AGA (dB) RAGA = 24k -3 -4 RAGA = 16k -5 -6 RAGA = 20k -7 0 10 20 30 40 50 60 70 80 90 100 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 VB (V) 4.0 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 µA; RGSA = 560k 21 4741C–CORD–11/05 Figure 8-6. Typical Load Characteristic of VB for a Medium DC-characteristic (RDC = 130 kΩ) and 3-mW Loudspeaker Output 5.0 4.5 4.0 VB(V) 3.5 3.0 IL = 15 mA IL = 20 mA IL = 30 mA 2.5 2.0 1.5 1.0 0.5 0 0 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 µA; RGSA = 560k Figure 8-7. Typical Load Characteristic of VB for a Minimum DC-characteristic (RDC = 68 kΩ) and 3-mW Loudspeaker Output 4.5 4.0 IL = 30 mA 3.5 IL = 15 mA VB (V) 3.0 IL = 20 mA 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 µA; RGSA = 560k 22 U4090B-P 4741C–CORD–11/05 4741C–CORD–11/05 RGT 2 1 1 kΩ 3 42 1 µF 4 41 68 nF ZEAR RGR 5 40 10 µF 6 39 S2 = closed: ringer mode S1 = closed: speech mode RDC 3 kΩ VM Reference figure for not connected pins VM 43 44 150 nF VL 7 10 µF 3 kΩ 22 µF 38 VM 8 600Ω 37 VM 9 36 S1 4.7 nF 10 35 36 kΩ 36 kΩ 10Ω IL IM 33 32 11 47 µF 13 220 µF 50Ω 1000 µF 12 U4090B-P 34 100 µF open VMP 47 nF 47 nF 47 µF 14 31 62 kΩ 2.2 mH IDC IMP 15 30 10 µF 10 µF 68 nF 17 28 S2 18 27 3.3 nF SD103A BC556 16 29 3.3 nF DC VRING 680 kΩ 19 26 2 MΩ VMP 20 25 open VMP 1 µF open 21 24 22 23 RGSA Figure 8-8. 220 nF Mico U4090B-P Basic Test Circuit 23 24 3 42 VMIC 1 µF 4 41 68 nF RGR VMP 5 40 6 39 RDC 10 µF VM 7 38 10 µF ZEAR Open pins should be connected as shown in Figure 8-14 VB (external supply): S1b Line detection: S1a 2 1 RGT 43 150 nF VL 44 220 nF Mico 8 37 IL 9 4.7 nF VL 36 V 10 35 10 100 µF 33 IB b 220 µF 11 a 13 open VB DC S1 1000 µF 12 47 µF 62 kΩ 32 U4090B-P 34 IM 14 31 15 30 RAGA IMP 16 29 17 28 18 27 30 kΩ VLIDET 19 26 V 20 25 1 mF 21 24 RGSA 22 23 Figure 8-9. Test Circuit for DC Characteristics and Line Detection U4090B-P 4741C–CORD–11/05 4741C–CORD–11/05 1 µF b AC 25 kΩ V max VMICO RGT 3 2 1 42 43 150 nF VL 44 220 nF Mico S1 1 µF S2 68 nF a V mic VCM 4 41 RGR b 5 40 S1 25 kΩ a 6 39 VM 600 RDC 22 µF ZEAR 22 µF 7 38 10 µF 8 37 4.7 nF V 9 36 VMP 10 35 33 32 220 µF 1000 µF 12 13 47 µF 14 Vmic VL 17 28 18 27 Input resistance: Ri = 19 26 VMP open + GT with S1b, S2 = closed, S3 = open VL (at IMPSEL = open) VL (at IMPSEL = low) VL (at MUTX = open) VL (at MUTX = low) VL VCM -1 Open pins should be connected as shown in Figure 8-14 GTTX = 20 × log Mute suppression: GTM = 20 × log log VL (S2 = open) VL (S2 = closed) 50 k 20 25 VMP ∆GTI = GT (at IL = 100 mA) - GT (at IL = 14 mA), S3 = closed IMP 16 29 Gain change with current: ∆GTI = GT (at IL = 100 mA) - GT (at IL = 14 mA) Line loss compensation: 15 30 RAGA Transmitting amplification GT = 20 × log 11 31 S3 62 kΩ U4090B-P 34 IM Common mode rejection ratio: CMRR = 20 IL 100 µF VL, dt, n o 10Ω open open 21 24 1 µF 22 23 U4090B-P Figure 8-10. Test Circuit for Transmission Amplifier 25 26 220 nF S2 2 1 RGT 43 VM 3 42 1 kΩ 150 nF 1 µF VL 44 220 nF Mico 4 41 V 5 40 V DTMF 68 nF RGR 10 µF 6 39 7 b S1 600Ω 10 µF 38 ZEAR a 9 36 4.7 nF 22 µF AC 8 37 VZEAR, dr V GEN RDC VM V MP 32 V 11 V LR 1000 µF 220 µF 12 13 47 µF 62 k 14 31 S3 15 30 RAGA I MP 16 29 17 28 18 27 b) RA2: ∆GR = 20 × log (VLR/VZEAR) dB + GR, MUTR = VMP a) RECATT: ∆GR = 20 × log (VLR/VZEAR) dB +GR, MUTR = open Mute suppression: AC-impedance: (VLR/(VGEN - VLR)) × ZL DTMF-control signal: GRM = 20 × log (VZEAR/VDTMF) dB (S1 =a, S2 = closed) Receive amplification: GR = 20 × log ( VZEAR/VLR) dB (S1 = b, S2 open) Receiving noise: S1a Line loss compensation: ∆GRI = GR (at IL = 100 mA) - GR (at IL = 14 mA), S3 = closed IL 33 U4090B-P 34 IM Open pins should be connected as shown in Figure 8-14 c) DT MF operation: ∆GR = 20 × log VLR/VZEAR) dB + GR, MUTX = VMP 10 10 35 100 µF open 19 26 V MP V MP 20 25 open 1 µF open 21 24 22 23 Figure 8-11. Test Circuit for Receiving Amplifier U4090B-P 4741C–CORD–11/05 4741C–CORD–11/05 220 nF Mico S1 V MIC 3 42 4 41 68 nF RGR VL 5 40 V 6 39 RDC RSAO VSAO 2 Open pins should be connected as shown in Figure 8-14 Attenuation of transmit gain: S1 = closed Output power: PSA = 10 µF ZEAR 4.7 nF 7 38 10 µF Gain from SAI to SAO: 20 × log (VSAO/VSAI) dB Input impedance: (VZIN/(VSAO - VZIN)) × RIN 2 1 RGT 43 1 µF 8 37 600Ω 22 µF 10Ω 9 36 34 33 32 11 IL 50Ω 47 µF 13 V 1000 µF 12 U4090B-P 220 µF 10 35 62 kΩ 15 30 I MP 10 µF n SA VZIN, S4 = open VSAO, S4 = closed 47 µF 14 31 10 µF 16 29 17 28 I INLDR 18 27 I INLDT off V LIDET 19 26 220 nF V 20 25 S4 VATAFS 44 150 nF VM 30 kΩ 1 µF 21 24 20 kΩ V 22 23 RGSA V SAI U4090B-P Figure 8-12. Test Circuit for Speaker Amplifier 27 28 V GEN3 S3 220 nF 2 1 RGT 43 AC 3 42 50 kΩ 150 nF VL 44 220 nF Mico VM 1 kΩ 1 µF 4 41 V 68 nF RGR V DTMF 5 40 6 39 RDC 7 38 10 µF VM 10 µF ZEAR 4.7 nF 8 37 9 36 IL 10Ω 10 35 220 µF 100 µF 33 32 V 11 13 47 µF dD VL 50 kΩ: S3 = open VL: S3 = closed 1000 µF 12 U4090B-P 34 IM 62 kΩ 14 31 15 30 17 28 18 27 19 26 20 25 Open pins should be connected as shown in Figure 8-14 Input resistance: (VL50K/(VL - VL50k)) × 50 kΩ DTMF-amplifier: 20log (VL/VDTMF) dB I MP 16 29 V MP open 21 24 1 µF 22 23 Figure 8-13. Test Circuit for DTMF Amplifier U4090B-P 4741C–CORD–11/05 4741C–CORD–11/05 43 2 44 1 RRING = IRING VRING 3 42 4 41 68 nF 5 40 6 39 RDC 7 38 IL 10 µF 8 37 4.7 nF 9 36 Open pins should be connected as shown in Figure 8-14 (VMPON) and back again (VMPOFF) (S5, S3 = closed) 10 35 10Ω 33 32 11 V SAO 47 µF 220 µF 50Ω I MP 13 1000 µF 12 U4090B-P 34 100 µF Vring (S1 = closed ) Iring 5) Ring detector enable: detecting VRFDO, when driving VMP from 0.7V to 3.3V RRINGSP = (S 3 = closed) 4) Input impedance in speech mode (IL > 15 mA): 3) Input impedance: and back again (VRINGOFF) (S2 = closed) PSA = Vsao 2 (S 4 closed) RSAO 2) Threshold of ringing frequency detector: detecting VRFDO, when driving VRING from 2V to 22V (VRINGON) 1) Max. output power: VMP 2.2 mH ramp S5 47 µF 14 31 62 kΩ 15 30 V 18 27 V 19 26 I RING 20V 1.5V V RING V RING 680 kΩ 17 28 SD103A BC556 68 nF 16 29 DC S1 VSAI ramp S2 V RFDO 20 25 100 nF 1 kHz 1.8 Vpp S3 DC I RING 21 24 22 23 DC 20.6V S4 1 µF RGSA U4090B-P Figure 8-14. Test Circuit for Ringing Power Converter 29 30 2 1 RGT 43 44 68 nF V pd 4 41 5 40 I pd V MP 10 µF open 7 6 10 µF RDC 38 39 ZEAR 8 37 Open pins should be connected as shown in Figure 8-14 3 42 RGR VM IL 9 4.7 nF 10Ω 36 I MUTR V 10 35 34 33 IM 32 VL 11 1000 µF 220 µF 12 13 14 31 62 kΩ 47 µF U4090B-P 100 µF V MP 15 30 I MP 16 29 17 28 18 27 19 26 V MP I IMPSEL 20 25 I MUTX RGSA 21 24 V MP 22 23 1 µF Figure 8-15. Test Circuit for Input Characteristics of I/O Ports U4090B-P 4741C–CORD–11/05 4741C–CORD–11/05 VM C 20 R 16 C 19 R 17 speaker Loud- MICO RECO C 22 DTMF Generator R 19 R 20 R 27 R 28 R 14 C 14 C 15 C 16 R 31 C 17 C 18 C 21 Microphone R 15 M 25 35 33 36 8 31 7 U4090B-P 21 R3 38 10 R8 R4 C4 11 14 37 C5 34 13 24 22 12 26 29 30 27 28 42 Earpeace 40 R 11 41 R9 R 10 C 13 VM C 12 VM 39 C 11 STN 2 ST (Option) 43 VL 18 19 15 16 17 20 32 R6 C8 to µC C 10 C6 6 R 12 44 12V R2 2 R 13 3 to ST C2 9 23 1 C1 4 5 R1 C3 R7 VM L1 Q9 C9 R5 Micro controller hook switch Ring V MP C7 Tip U4090B-P Figure 8-16. Application Circuit for Loud-hearing 31 32 DTMF HF-Mic VM R 17 Loud speaker LOGTX RECO R 22 R 23 C 23 R 25 R 24 R 16 C 26 C 27 R 29 R 30 C 24 C 25 VM R 15 R 14 C 14 C 15 C 16 R 18 C 17 C 18 C 21 Microphone R 26 25 33 8 21 31 7 R3 10 R8 R4 11 37 14 43 C5 13 C6 24 22 12 26 29 30 27 28 42 2 R 13 35 36 Earpiece 40 R 11 41 R9 R 10 C 13 VM C 12 VM 39 U4090B-P C 11 ST 38 (Option) STN 2 LOGTX VL C 10 18 19 15 16 17 20 32 6 9 R 12 44 R2 C4 4 3 12V C3 34 23 1 to ST C2 5 R1 C1 R 21 R7 VM BC177 VB R6 C8 to µC L1 Q1 Microcontroller C9 R5 hook switch V MP C7 Ring Tip Figure 8-17. Application for Hands-free Operation U4090B-P 4741C–CORD–11/05 U4090B-P Table 8-1. Typical Values of External Components (Figure 8-16 on page 31 and Figure 8-17 on page 32) Name Value Name Value Name Value Name Value C1 100 nF C16 47 µF R3 > 68 kΩ R18 30 kΩ C2 4.7 nF C17 10 µF R4 10 kΩ R19 6.8 kΩ C3 10 µF C18 10 µF R5 1.5 kΩ R20 6.8 kΩ C4 220 µF C19 68 nF R6 62 kΩ R21 15 kΩ C5 47 µF C20 68 nF R7 680 kΩ R22 330 kΩ C6 470 µF C21 1 µF R8 22 kΩ R23 220 kΩ C7 820 nF C22 100 nF R9 330 kΩ R24 68 kΩ C8 100 µF C23 6.8 nF R10 3 kΩ R25 2 kΩ C9 100 nF C24 10 nF R11 62 kΩ R26 3.3 kΩ C10 150 nF C25 100 nF R12 30 kΩ R27 18 kΩ C11 86 nF C26 470 nF R13 62 kΩ R28 2 kΩ C12 33 nF C27 33 nF R14 120 kΩ R29 1 kΩ C13 10 µF L1 2.2 mH R15 47 kΩ R30 12 kΩ C14 100 nF R1 27 kΩ R16 1 kΩ R31 56 kΩ C15 1 µF R2 20 kΩ R17 1.2 kΩ 33 4741C–CORD–11/05 9. Ordering Information Extended Type Number Package Remarks U4090B-PFNY SSO44 Pb-free U4090B-PFNG3Y SSO44 Taped and reeled, Pb-free T4090B-PC Die Chip on foil 10. Package Information 9.15 8.65 Package SSO44 Dimensions in mm 18.05 17.80 7.50 7.30 2.35 0.3 0.25 0.10 0.8 16.8 44 0.25 10.50 10.20 23 technical drawings according to DIN specifications 1 34 22 U4090B-P 4741C–CORD–11/05 Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel: (41) 26-426-5555 Fax: (41) 26-426-5500 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel: (852) 2721-9778 Fax: (852) 2722-1369 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany Tel: (49) 71-31-67-0 Fax: (49) 71-31-67-2340 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 La Chantrerie BP 70602 44306 Nantes Cedex 3, France Tel: (33) 2-40-18-18-18 Fax: (33) 2-40-18-19-60 ASIC/ASSP/Smart Cards 1150 East Cheyenne Mtn. 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