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TEA7092
TELEPHONE ANALOG FRONT END
. . . . . . . . . . . . . .
SPEECH DC LINE CURRENT RANGE FROM 6 TO 120mA EXTERNALLY ADJUSTABLE : - Tx AND Rx GAIN - MAXIMUM TRANSMIT LEVEL - RETURN LOSS - SIDETONE NETWORKS - Tx AND Rx AGC (LINE CURRENT START UP VALUE AND SLOPE) SOFTCLIPPING ON Tx CHANNEL SQUELCH ON Tx CHANNEL TO REDUCE NOISE ENVIRONMENT AND TO IMPROVE HOWLING IMMUNITY IN LOUDHEARING MODE RECEIVING AMPLIFIER FOR PIEZO AND ELECTRODYNAMIC TRANSDUCERS FREQUENCY GENERATOR FOR WAITING MELODY ERROR BEEP GENERATOR HOLD LINE CURRENT DETECTOR FOR TRANSFER/AUTO RELEASE FEATURE PROGRAMMABLE BY MICROCONTROLLER SERIAL BUS : - -6dB ON Tx CHANNEL - +6dB ON Rx CHANNEL - AGC INHIBITION ON Tx AND Rx CHANNELS FOR PABX USE - SQUELCH INHIBITION
. . . . . . . . . . . .
PROGRAMMABLE BY MICROCONTROLLER SERIAL BUS : - DIGITAL VOLUME CONTROL (15 STEPS OF 4dB EACH) AND OFF MODE - RING FREQUENCY GENERATOR (MORE THAN 200 FREQUENCIES AVAILABLE)
DIALING PROGRAMMABLE BY MICROCONTROLLER SERIAL BUS : - DTMF GENERATOR - 2V DC LINE VOLTAGE DURING THE MAKE PERIOD IN PULSE MODE MICROCONTROLLER INTERFACE 3.5V STABILIZED SUPPLY TWO WIRES SERIAL BUS INTERFACE RING INDICATOR PON LINE CURRENT INDICATOR RESET SIGNAL LINE CURRENT VARIATION INDICATOR (FOR TRANSFER FEATURE) OSCILLATOR WITH STAND BY MODE CORDLESS AND ANSWERING MACHINE INTERFACE SELF BIASED LOUDSPEAKER AMPLIFIER AND MICROCONTROLLER INTERFACE FOR ANSWERING MACHINE SIGNAL INPUT AND OUTPUT INTERFACE FOR CORDLESS VRMC SUPPLY CAN BE EXTERNALLY FORCED TO 5V FOR EASY INTERFACE WITH A MAIN POWERED MICROCONTROLLER
GROUP LISTENING / ON HOOK DIALING ANTI-HOWLING WITH ACOUSTIC FEEDBACK SYSTEM COUPLED TO SQUELCH RING MELODY CONTROL AND ERROR BEEP GENERATORS PROGRAMMABLE BY MICROCONTROLLER SERIAL BUS : - DIGITAL VOLUME CONTROL (7 STEPS OF 4dB EACH) AND OFF MODE HANDFREE INTERFACE PINS AND SOFTWARE FACILITY FOR EASY INTERCONNECTION WITH HANDSFREE CONTROLLER I.C. LIKE TEA7540 RING ON LOUDSPEAKER EMBEDDED SWITCH MODE POWER SUPPLY DRIVER TO FEED THE LOUDSPEAKER AMPLIFIER DURING RING MODE
TQFP44 (Plastic Quad Flat Package) ORDER CODES : TEA7092TQ - TEA7092TQT
July 1996
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TEA7092
DESCRIPTION The TEA7092 is a Telephone set Analog Front End (TAFE) interface intended for use in conjunction with a microcontroller. In this configurationthe TEA7092 provides a worldwide telephone set with loudhearing and melody ringer on loudspeaker. An handsfree telephone set can be built by adding the TEA7540 handsfree controller. The simple interface with a +5V main supply allows to use the TEA7092 in terminal like Answering machine, FAX and cordless base station. Repertory dialer (memory on MCU) and various features (HOLD, Tone/Pulse, Flash, Mute, adjustable Ringer and Loudspeaker levels...) are programmable by the MCU through the serial bus interface. PIN CONNECTIONS
DTMF2 LSOUT GNDP GREC EAR+ 35 EARRCO SWP RSU VZP ISL 34
The MCU through the serial bus interface. The concept using TAFE and Microcontroller is called BICHIP approach.
BENEFITS The benefits of this concept are : - Saving of external components. - Easy upgrade of the features (memories, LCD driver, Answering machine, FAX, Cordless ...). - Rep lac e me nt o f co nf igu ra t io n s wit ch es (PABX/Public, Tone/Pulse) and potentiometers for loudspeaker and ringer control, by EEPROM settings. - Reliability and cost improvements.
44
43
42
41
40
39
38
37
36
VLS VMC VL VRE FL LSIN LSSOF DTMF1 VRMC OSC RI/VI RESE T
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
33 32 31 30 29 28 27 26 25 24 23
ILL AGND S LP VS IRE F SO FTL TS OFT VCC VREF MIC2 MIC1
DATA
SNLL
CLK
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7092-01.EPS
SNSL
RECIN
REOUT
HFIN
ASQ
ASC
PON
GTR
TEA7092
PIN DESCRIPTION
Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 Name VLS VMC VL VREFL LSIN LSSOF DTMF1 VRMC OSC RI/VI RESET PON CLK DATA SNSL SNLL ASQ ASC RECIN REOUT GTR HFIN MIC1 MIC2 VREF VCC TSOFT SOFTL IREF VS SLP AGND ILL ISL EAR+ EARGREC VZP SWP RSU RCO DTMF2 GND LSOUT Loudspeaker Power Supply Unregulated Input of Microcontroller Power Supply Transmit Output Loudspeaker Reference Voltage (VLS/2) Loudspeaker Amplifier Input Loudspeaker Softclipping Time Constant DTMF Filter 1 Stabilized Microcontroller Power Supply Oscillator Input Ring Indicator / Line Current Variation Indicator Microcontroller Reset Output Line Current Indicator Output Serial Bus Clock Input Serial Bus Data Input Short Line Sidetone Network Input Long Line Sidetone Network Input Antiacoustic & Squelch Time Constant DC Offset Cancellation of Squelch Amplifier Receive Input Receive Output for Handsfree Interface & Loudspeaker Input Transmit Gain Adjustment Handsfree Microphone Input Referenced to VREF Microphone Input 1 Referenced to VREF Microphone Input 2 Referenced to VREF Speech Reference Voltage (VCC/2) Speech Power Supply Transmit Softclipping Time Constant Softclipping Adjustment Resistor to Set Reference Current Active Self Inductor & DC Characteristic Adjustment DC Mask Slope Adjustment Analog Ground & Negative Line Voltage Long Line Speech Control Adjustment (GMAX) Short Line Speech Control Adjustment (GMAX-6dB) Earphone Output Earphone Output Receive Gain Adjustment Switch Mode Power Supply Internal Zener Switch Mode Power Supply Output Switch Ring Start-up Level Ring Power Output Control Power Ground & Negative Line Voltage Loudspeaker Output
7092-01.TBL
Description
DTMF Filter 2
3/24
EARPHO NE
ILac+dc
HAND-FREE
ILdc
4/24
Zasl VCC VLS GND 0V VLS
1 6 4
TEA7092
LINE Zall VS
30 3 19 15 16
VCC VL RECIN SNSL SNLL LSSOF VREFL
BLOCK DIAGRAM
26
TEA7092
VLS/2 ILdc ILdc ILdc I LINE SENSING STATUS DC CARACTERISTIC
VREF
25
VCC/2
IREF
29
I &V REFERENCES
HOLD
LOGIC CTRL
SLP 31
LSIN 5 AGC AGC INPUTS 100 A MUX AGC SAT DETECT DIGITAL VOLUME CONTROL 7 steps 4dB POWER SIDETONE MIXER Gmax-Gtl DC BIAS
ILdc 82.ILac I(vls) LOUDSPEAKER CURRENT SUPPLY & OUT TX ILac+dc
REOUT 20
GREC
37
MUTE
EARVREF
36
AGC CONTROL VERSUS LINECURRENT
LSOUT
44
EARPHONE
AMPLIFIER
EAR+ 35 Gtl -10 -15 -20 -25dB
-1
RX & TX
LOUDSPEAKER GND 0V +RING
LOUDHEARING
VLS
38 41
ASQ 17 ASC dc cut
18
SOFTL 28 SQUELCH ANTI-HOWLING G=200 MUTE & DTMF Tx. AMP AGC 1/RGT POWER CURRENT EXTRACTOR (3mA)
VL
VZP RCO OUTPUT POWER RING SIGNAL OPTIMISATION GND 0V
TSOFT 27
SOFTCLIPPING
MIC2
24
MICRO
MIC1
A=10
23
HFIN SERIAL DC REGULATOR
C21
22
RING
40 39
RSU RING INDICATOR CONTROL ILdc SWITCH MODE POWER SUPPLY SWP
GTR 21
RGT PON & RESET CONTROL I-DAC HF GND 0V
ILL 33
ISL 34
AGND 32
I-DAC LF
LOGIC CONTROL
OSCILLATOR GND 0V LOGIC MICROCONTROLLER SERIAL INTERFACE RING MELODY GENERATOR
DTMF
BEEP MUTE VREF
GND 43 SINE CODE
GND 0V
7 42 2 8 12 11 14 13 10 9
DTMF1
DTMF2
VMC
VRMC
PON VRMC
RESET DATA
CLK
RI/VI
OSC VLS 3.58MHz
7092-02.EPS
TEA7092
ABSOLUTE MAXIMUM RATINGS
Symbol VRECIN VL IL VRSU VSWP VVLS VVCC VVM VVRMC VPON VCLOCK VDATA VRI/VI Toper Tj Tstg Supply Voltage Line Voltage Line Current Ring Input Voltage Output Switch Voltage Loudspeaker Part Supply Speech Part Supply Voltage Unregulated Microprocessor Supply Voltage Regulated Microprocessor Supply Voltage Power-On Out Voltage Clock In Voltage Data In Voltage RI/VI Out Voltage Operating Temperature Junction Temperature Storage Temperature Parameter Value 13 13 0.15 22 7 5.5 10 5.5 5.5 VRMC+0.3V, GND-0.3V VRMC+0.3V, GND-0.3V VRMC+0.3V, GND-0.3V VRMC+0.3V, GND-0.3V -20, +70 -20, +150 -55, +150 Unit V V A V V V V V V V V V V C C
7092-02.TBL
C
Note: Typical Thermal resistance TQFP44 Copper lead frame 70 K/W @ 1W.
Figure 1 : Safe Area
140 120 100 IL (mA) 80 60 40 20 0 0 2 4 6 8 VL (V) 10 12 14
7092-03.EPS
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TEA7092
DC CHARACTERISTICS (Tamb = 25C, see Test 1) Between IL = 8mA and IL = 20mA the DC slope is fixed by RS and RSLP : VL(IL) = RS x (40E-6 + 0.5E-3 x IL) + RSLP/55 x (IL - 5.6E-3). For line current higher than 20mA the slope is fixed by RSLP : VL(IL) = VL (20E-3) + RSLP/55 x (IL - 20E-3).
Symbol VL1 VL2 ILSQ Parameter Line Voltage in Speech Mode Line Voltage after Having Sent 0010101 Mask Code Loudspeaker Amplifier Quiescent Bias Current Unstabilized Supply : - Start up Current - Unregulated Input Current Stabilized Microprocessor Supply ILS Drop Voltage (VL-VLS)1 (VL-VLS)2 ILS1 Loudspeaker Current Supply IL = 20mA IL = 90mA IL = 20mA VLS = 4.5V IL = 20 mA, VLS no connect, VMC = 2.4V VRMC = 2.4V VRMC = 3.75V IL = 20mA, I(VRMC) = -1.8 or 0mA VL AC = 0VRMS IL = 20mA IL = 90mA VLS = 2V IL = 20mA IL = 90mA 11 70 Test Conditions Min. 4.1 6.6 Typ. 4.7 7.5 1.6 1.1 Max. 5.25 8.4 2.5 2.2 Unit V V V mA
I(VMC)1 I(VMC)2 VRMC
10 2 3.2
15 2.7 3.5 1.1 1.8 13 77
3.6 3.75 1.3 2.3
mA mA V V V mA mA
7092-03.TBL 7092-04.EPS 7092-04.TBL
RETURN LOSS (Tamb = 25C, see Test 2
Symbol RLoss Parameter Return Loss Test Conditions IL = 20mA, f = 1000Hz Min. 20 Typ. 23 Max. Unit dB
TRANSMIT CHARACTERISTICS The maximum gain Gtl is adjustable between 44 and 56dB versus RGT value ( RZ // RL + R3 ) // ZIN Gtl = 20 x log 820 x RGT // 50k ZIN = internal impedance at Pin VL # 8k. The AGC variation is programmable through two external resistors connected on Pins ILL and ISL. ILL is the line current at which the gain is at the maximum value and ISL is the line current at which the gain is at the maximum value minus 6dB. For line current lower than ILL or higher than ISL, the transmit and receive gains have a constant value. The following formulas give RLL and RSL values versus ILL and ISL. 310 310 RSL = and RLL = ISL - 5.6mA ILL - 5.6mA Tx Softclipping (see Figure 2) Figure 2 :
2 1 VL (VRMS ) 0.5 VLINE Distortion
Tx Softclipping and Distortion at IL = 20mA
12 10 D(VL) (%) 8 6
0.2 0.1
4 2 0 0.5 1 2 5 10 20 50 100
0.05 0.2
VMIC1-MIC2 (mVRMS )
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TEA7092
TRANSMIT CHARACTERISTICS (continued) Maximum Level on Line in Tx (see Figure 3) The minimum operating voltage of the TEA7092 is 2.5V. At low line current value, when the voltage over the TEA7092 is low, the softclipping function automatically limits the AC dynamic to avoid to reach the 2.5V limit on the TEA7092. When the DC voltage over the TEA7092 is high enough, the AC dynamic is limited at a value fixed by the external resistor RSOFT connected on Pin SOFTL. The Value of RSOFT is performed by : RSOFT = (RS x 50E-6 - 0.8 - VacPeak) / 40E-6 Tx Characteristics (Tamb = 25C, f = 1kHz, see Test 3)
Symbol Gtl Gtsm Transmit gain in Handsfree Mode Ghl Ghfm Gt-6dB Zmic Zhf Ntx Nhf Mmic VLpeak Dtx1 Dtx2 Transmit Gain (-6dB in transmit path) Handset Mic Input Impedance Handsfree Mic Input Impedance Transmit Noise in Handset Mode Transmit Noise in Handsfree Mode Microphone Mute Transmit Softclipping Level Transmit Distortion Parameter Transmit gain in Handset Mode Test Conditions Vem = -48dBV IL = 20mA IL = 90mA Vhfin = -28dBV, Code 0110010 IL = 20mA IL = 90mA Vem = -48dBV, IL = 20mA Code 0110110 Between Pins MIC1, MIC2 Between HFIN and VREF IL = 20mA, Code 0110010 2k between MIC1 & MIC2 2k between HFIN & VREF Vem = -48dBV, IL = 20mA See Figure 2, Vem = -42dBV, IL = 20mA IL = 20mA, see Figure 2 Vem = -48dBV Vem = -36dBV 60 1.0 1.4 1.8 1 5 Min. 44 37 24 17 5 30 15 Typ. 45 39 25 19 6 40 20 -75 -75 Max. 46 41 26 21 7 50 25 Unit dB dB dB dB dB k k dBmp dBmp dB Vpeak % %
Squelch on Transmit Channel (Tamb = 25C, f = 1kHz, IL = 20mA, see Test3) The principle of the squelch is to reduce the transmit gain as soon as the amplitude of the signal on the microphone is lower than a fixed threshold voltage, VT2.
Symbol Gtlmax Gtlmax-Gsq Gsq Parameter Transmit Gain Gain Variation Test Conditions Vem1 = -75dBV Vem2 = -65dBV See Figure 4 / Min. Typ. 36 45 9 Max. Unit dB dB dB
Figure 3 :
10 8 6 VL (V) 4 2
Line Peak Voltage versus DC Line Current
Figure 4 :
Transmit Gain versus Microphone AC Input Signal
VAC Pe a k DC Mas k VAC Pe a k
Tra ns mit Gain (dB)
Gtlmax Gst Gtlmax - Gs q Dgt
7092-05.EPS
2.5V Min. Line Pe a k Voltag e 0 20 40 60 IL (mA) 80 100
Ve m1 VT1
VT2
Vem2
Microphone AC Voltage
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7092-06.EPS
Ve m (dBV)
TEA7092
RECEIVE CHARACTERISTICS (Tamb = 25C, f = 1kHz)
Symbol Eff Grl Grs Grs+6 Drx1 Drx2 Nrx Mrx ZIN ZOUT Noise Mute Input Impedance Output Impedance Gain +6dB Code [0010110] Distortion Parameter Sidetone Efficiency Test Conditions Test 3, Vem = -48dBV, IL = 20mA Test 2 IL = 20mA IL = 90mA IL = 90mA Test 2, IL = 20mA Vear = -3dBV Vear = 0dBV Test 2, IL = 20mA Test 2, IL = 20mA, VL = -9dBV Between Pins SNSL & SNLL 60 120 5 150 -76 5 -1.2 5 6 0.8 6 Min. Typ. Max. 26 7 2.8 7 3 5 Unit dB dB dB dB % % dBmp dB k
The sidetone of the TEA7092 uses two networks, these two networks are internally mixed between long line length and short line length. The following equation gives the sidetone impedance versus line current : ZAL = K x ZALL + (1 - K) x ZASL K = 1 for IL = ILL ; K = 0 for IL = ISL, and K varies linearly between 1 and 0 when IL varies between ILL and ISL. It is possible to use only the standard one sidetone concept by short-circuited Pins SNSL ans SNLL. Gain Control Inhibition Facility For PABX Application (Tamb = 25C, I L = 20mA, f = 1kHz / No AGC mode selected 0010100)
Symbol Gtp Grp Parameter Transmit Gain Receive Gain Test 2 Test 3 Test Conditions Min. Gtl - 3 Grl - 3 Typ. Gtl - 2 Max. Gtl -1 Unit dB dB
Grl - 1.4 Grl - 0.5
LOUDSPEAKER AMPLIFIER PART Loudspeaker Amplifier Channel (Tamb = 25C, f = 1kHz, RLS = 50, Vem = 0) The Loudspeakeramplifier channel has a maximum gain of 35dB between Pin LSIN and Pin LSOUT. This gain is programmable through the serial bus interface, 7 steps of 4dB each. To avoid distortion, the output level on the loudspeaker is controlled by a softclipping function, the time constant of this feature is connected to LSSOF pin.
Symbol GLS0 GLS1 GLS2 GLS3 GLS4 GLS5 GLS6 GLS7 Mls lsin PLS1 PLS2 GMAX GMAX-4dB GMAX-8dB GMAX-12dB GMAX-16dB GMAX-20db GMAX-24dB GMAX-28dB Mute Loudspeaker Input Impedance Output Power Test 4, Gain = GLS0, VIN = 0.15VRMS IL = 20mA, D 2% IL = 90mA, D 2% Parameter GAIN VHP/Vac Test Conditions Test 4 IL = 20mA Code: (0 1 0 0 1 1 1) Code: (0 1 0 0 1 1 0) Code: (0 1 0 0 1 0 1) Code: (0 1 0 0 1 0 0) Code: (0 1 0 0 0 1 1) Code: (0 1 0 0 0 1 0) Code: (0 1 0 0 0 0 1) Code: (0 1 0 0 0 0 0) Test 4 30 13 40 40 18 55 33.5 29.5 25.5 21.5 17.5 13.5 9.5 5.5 35 31 27 23 19 15 11 7 36.5 32.5 28.5 24.5 20.5 16.5 12.5 8.5 -30 50 dB dB dB dB dB dB dB dB dB k mW mW Min. Typ. Max. Unit
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TEA7092
LOUDSPEAKER AMPLIFIER PART (continued) Antiacoustic Feedback (Tamb = 25C, IL = 20mA, see Test 4) The antiacoustic feedback system is coupled to the microphone squelch. As soon as the level on the handset microphone is higher than VT2, the transmit gain increases and the loudspeaker gain decreases. So the transmit and loudspeaker gains are never simultaneously at maximum gain, which reduces larsen effect.
Symbol Dgls(0) Dgls(1) Dgls(2) Dgls(3) Parameter Antiacoustic Feedback Efficiency Code Code Code Code Test Conditions 0111100 0111101 0111110 0111111 Min. -12 -17 -21.5 -26.5 Typ. -9.5 -14.5 -18.5 -22.5 Max. -7 -12 -15.5 -18.5 Unit dB dB dB dB
Figure 5 : Loudspeaker Gain GLS versus Voltage on Microphone
Gtr (dB) Gmax Gma x - 9dB VT1 GLS GLS - xdB VMIC Low Microphone Le vel Normal Spee ch 9dB 3dB VT2 VSOFT VMIC High Microphone S igna l S oftclipping Mode
RING MODE Loudspeaker Power Supply in Ring Mode (Tamb = 25C, RLS = 50, see Test 5) In ring mode, it is neccessary to convert the high voltage / low current power input to a low voltage / high current power, output to be able to drive a 50 loudspeaker,the external switch mode power supply driven by the TEA7092 realizes this feature. The switch mode power supply, through external component values, fixes the impedance and the start up threshold level. The volume control in ring mode is the same than the one used in loudspeaking mode for the highest steps, 8 steps of 4dB, and 5 more steps of 4dB each have been added, by using the code 0111011, for the lowest one, by this way the maximum depth in ring mode for the volume control is 48dB.
Symbol ILEAK1 ILEAK2 IRON1 IVRSU VLS1 VRMC1 VRI1 VRES1 VLS2 VRMC2 VRI2 VRES2 VOUT Parameter Leackage Current Input Current Start up Current LS Supply Stabilized Microprocessor Supply Ring Indicator Output Reset Output LS Supply Stabilized Microprocessor Supply Ring Indicator Output Reset Output LS Output Level Test Conditions VRING = 16V, I(VZP) = 0 VRING = VRSU = 22V, I(VZP) = 20A VRING = 22V I(VZP) = 140A, I(VLS) = 40mA No code sent, no signal on the loudspeaker output Min. Typ. 40 130 10 60 3.05 3 2.95 2.95 5.4 3.4 3.3 3.3 5.4 Max. 150 400 12 150 3.5 Unit A A mA A V V V V V V V V VPP
VRING = 22V, I(VZP) =250A, Gain = Gain Max., Codes sent : - Group listening - FI = 26321Hz & n = 60 - Ring start
2.8 2.75 2.7 2.7 5 3 2.9 2.9 5
3.75
Ring Frequency The frequencies of the ring are given by : Fring = Fi . n Fi can take one of the following values : 19455Hz, 21308Hz, 23551Hz or 26321Hz, and n varies between 1 and 63. Fi and n correspond to 2 codes sent on the serial bus.
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7092-07.EPS
GLS is P rogramma ble through the Volum e Control S ta g e x is P rogramma ble through the S e rial Bus (10, 15, 20, 25dB) (de fault va lue is 15dB)
TEA7092
DTMF GENERATOR (Tamb = 25C, see Test 3)
Symbol Amf Llf LhF Pmf tR tdiff Velf Vehf Vllf Vlhf Parameter Tone Frequency Accuracy Low Frequency Group Line Level Hifh Frequency Group Line Level Preemphasis HF/LF Rise Time Decay Time Confidence Tone Level : - Earphone Level (Low Frequency) - Earphone Level (High Frequency) - Loudspeaker Level (Low Frequency) - Loudspeaker Level (High Frequency) Test Conditions f = 3.58MHz, IL = 90mA IL = 20mA & 90mA IL = 20mA & 90mA IL = 20mA & 90mA IL = 20mA & 90mA IL = 20mA & 90mA IL = 20mA & 90mA Code Level (0100111) -35 -33 -10 -8 -32 -30 -7 -5 -29 -27 -4 -2 dBm dBm dBm dBm Min. -0.4 -9.5 -7.5 1 -8 -6 2 Typ. Max. 0.4 -6.5 -4.5 3 5 5 Unit % dBm dBm dB ms ms
Unwanted frequencies comply with CEPT 46-03. SINE WAVE GENERATOR ( Tamb = 25C, IL = 20 & 90mA, see Test 3) The sine wave generator uses the same path than the DTMF generator. Sinus wave frequencies are the half of the DTMF frequencies.
Symbol Sfl Sfh Parameter Line Level Line Level Test Conditions Low Frequency Group 348 / 385 / 426 / 470Hz High Frequency Group 604 / 668 / 738 / 816 Hz Min. -18 -16 Typ. -14 -12 Max. -10 -8 Unit dBm dBm
ERROR BEEP GENERATOR The frequencies of the error beep generator are given by : FEB = Fi . n Fi can take one the following values : 19455Hz, 21308Hz, 23551Hz or 26321Hz, and n varies between 1 and 63. Error beep generator code generates square wave signal in the earphone. Error beep generator code following by group listening code generate square wave signal in the earphone and in the loudspeaker.
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TEA7092
MICROCONTROLLER INTERFACE Microcontroller Power Supply The microcontroller power supply consists in a serial regulator which generates a 3.5V regulated supply on VRMC Pin, from an unregulated voltage applied on VMC or VLS Pin. The VMC Pin can be supplied either by the line, a battery or any DC generator. The use of VMC input allows to regulate the output VRMC voltage for an LCD display. With no load, the quiescent current, is 60A. For an output current of 1.8mA, the typical drop voltage between VMC and VRMC Pins is 150mV. Microcontroller Control Signals RESET : This output is setting to "1" when VRMC reaches the 2.6V threshold level. This output goes back to "0" : - If VRMC goes below 2.5V or - If the Reset code (0010111) is sent on the serial bus interface and if PON output is at level "0". When the Reset code has been previously sent, Pin RESET goes back to an high level, if VRMC is higher than the rise threshold, only on a rise edge of PON signal. If this PON rise edge does not appear, the RESET Pin remains at low logic level even if VRMC goes upper 2.6V. When PON output is at level "1", the Reset code is inhibited. PON : This output goes high when VRMC reaches the 2.6V threshold level and the line current value is upper than 12mA. As soon as the Reset output is at level "1", the 4mA line current threshold detector can be sent through the serial bus interface (0111001) to check if the line current value is between 4 and 12mA. RI/VI : - In Ring mode : This output goes to level "1" if : * Pin RSU > 19V * Pin VRMC > 2.6V - In Off-Hook mode : This output manages the line current variation indicator for transfer function and this information is used by the microcontroller to manage the transfer from one telephone set to an other one connected in parallel on the same line.
Figure 6 : Microprocessor Power Supply Block Diagram
VL 3 3mA ILS
1
VLS + C1 IL > 12mA (0111000) or IL > 4mA (0111001) 2.5V
11 RES ET 12 P ON
Ring Information
> 1M
VRMC
8
+ C8
S witch Clos e d if : VRMC > 2.5V or VRSU > 20V
2
135k
11/24
7092-08.EPS
VMC + C2
1.2V
90k
TEA7092
MICROCONTROLLER INTERFACE (continued) Reset and Power On Figure 7 : Telephone Set Powered from the Line, IL > IREF1, without Batteries
With ou t Us in g the RES ET Co d e Thro ug h the Se ria l Bu s Interfa c e IL A IREF 1 VMC 5 2.7 VRMC 3.5 2.6 t B C D E D A
t
P ON
t
RESET
t
t Us in g th e RES ET Co de Th rou g h th e S erial Bu s Interfa c e IL A IREF 1 VMC 5 2.7 VRMC 3.5 2.6 td td t B C D E D F D A
t
P ON
t
RESET
t
t A : ON-HOOK B : S TART UP + SP EECH C : P ULSE DIALING D : SP EECH or DTMF E : LINE BREAK EXCHANGE DURATION F : LINE BREAK EXCHANGE DURATION > td td : DELAY FIXED BY THE MICROCONTROLLER Re s et code (0010111) s ent by the microcontroller.
7092-09.EPS
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TEA7092
MICROCONTROLLER INTERFACE (continued) Microcontroller Stabilized Supply (Tamb = 25C, IL = 0mA)
Symbol VRMC1 VRMC2 Ivmcq1 Ivmcq2 Ivmcq3 Parameter Output Voltage Quiescent Current I(VMC) - I(VRMC) Test Conditions I(VRMC) = -1.8mA, VMC = 4V, VLS = 0V I(VRMC) = 0, VMC= 0V, VLS = 4V VMC = VRMC + 0.3V Oscillator ON, I(VRMC ) = 0 Code 0111010 I(VRMC) = -1.8mA I(VRMC) = 0 Min. 3.2 3.2 Typ. 3.5 3.5 250 95 50 Max. 3.75 3.75 400 200 120 Unit V V A A A
RESET (Tamb = 25C, IL = 0mA)
Symbol VRESL VRESH Parameter Low Threshold High Threshold Test Conditions IRESET = 1mA, VMC =4V VRMC = 0.66 x VRMC1 VRMC = 0.8 x VRMC1 Min. Typ. Max. 0.4 VRMC - 0.4 Unit V V
PON (Tamb = 25C)
Symbol VPONL VPONH1 VPONH2 Parameter Low Threshold High Threshold High Threshold Test Conditions IPON = -1mA Code (0111000), IL = 8mA Code (0111000), IL = 20mA Code (0111001), IL = 8mA Min. Typ. Max. 0.4 VRMC- 0.4 VRMC- 0.4 Unit V V V
RI/VI , Hold Function (Tamb = 25C)
Symbol VRIVIL VRIVIH Parameter Low Threshold High Threshold Test Conditions IL = 90mA, Code (0011010) IL = 70mA Min. VRMC - 0.4 Typ. Max. 0.4 Unit V V
13/24
TEA7092
MICROCONTROLLER INTERFACE (continued) Serial Bus Interface (data and clock) The serial bus uses 7 bits, a standard 8 bit word can be sent, the TEA7092 take care only of the seven first bits. The different codes are : - The ring start up code - The ring frequency control code - The mode codes : * Handset mode * Group listening mode * Handsfree mode - The operating codes (these codes are used under each code mode) : * Speech * Dialing * Microphone mute * Earphone/Microphonemute * Error beep * Sine wave high frequency * Sine wave low frequency - The data codes (DTMF, sinus wave, ring frequency, error beep frequency codes) : These data codes are stored inside the TEA7092 and are used as soon as an operating code is sent, dialing, error beep, sine wave or ring melody control or ring start up code. - The configuration codes (those codes are "flipflop" codes) : * AGC/no AGC * No mask / mask Figure 8 : 7 Bit Codes Data and Clock Input Timing
Datas will change during Clk = 1 t1
Ik Data
-
* Normal gain/normal gain +6dB, on receive channel * Two sidetone network/one sidetone network * Squelch/No squelch * Line current variation initialization (No transfer/Transfer) * Minus 21dB in Ring Mode * Minus 6dB in Sending Mode * Oscillator Stand-by For instance : The first time that the +6dB code is sent, the receive gain increases of +6dB. If it is sent again, the receive gain goes back to normal value. The loudspeaker level control codes The reset code to inialize the TEA7092 and to set the reset output to "0" low logic level The Init code to initialize the TEA7092, software initialization to set the TEA7092 in the start up condition. The start up condition of the TEA7092 is : * Handset mode. * Speech. * No mask. * AGC in transmit and receive channels. * Normal gain on receive channel. * Squelch on transmit channel. * Two sidetone networks. * No transfer. * Oscillator ON. * PON line threshold current : 12mA. * Anti-acoustic feed-back attenuation : 15dB.
t3
t2
t4
t5
ata
a0
a1
a2
a3
a4
a5
a6
7092-10.EPS
Synchro
t1 = t2 = t4 = t5 = 1s t3 = 2s
14/24
TEA7092
MICROCONTROLLER INTERFACE (continued) Note : In the tables in the following pages, the default codes are in Bold. The Mode Codes
Codes a6 0 0 0 a5 1 1 1 a4 1 1 1 a3 0 0 0 a2 0 0 0 a1 0 0 1 a0 0 1 0 Remarks Handset Mode Group Listening Mode Handsfree Mode
The Operating Codes Related to Mode Codes
Codes a6 0 0 0 0 0 0 0 a5 0 0 0 0 0 0 0 a4 1 1 1 1 1 1 1 a3 0 0 0 0 1 1 1 a2 0 0 0 0 1 1 1 a1 0 0 1 1 0 0 1 a0 0 1 0 1 0 1 0 Remarks Speech Dialing Mute Tx & Rx Mute Tx Error Beep Sine Wave High Frequencies Sine Wave Low Frequencies
The Configuration Codes (toggle codes)
Codes a6 0 0 0 0 0 0 0 a5 0 0 0 0 0 0 0 a4 1 1 1 1 1 1 1 a3 0 0 0 1 1 1 1 a2 1 1 1 0 0 0 0 a1 0 0 1 0 0 1 1 a0 0 1 0 0 1 0 1 Remarks AGC / no AGC No Mask / Mask Normal Receive Gain / +6dB Two Sidetones / Fixed Up (3/4 x ZALL +1/4 x ZASL) Squelch / No Squelch No Transfer / Transfer Request Two Sidetones / One Sidetone (ZASL)
The Other Codes
Codes a6 0 0 0 0 0 0 0 0 0 0 0 0 0 a5 0 0 1 1 1 1 1 1 1 1 1 1 1 a4 1 1 0 1 1 1 1 1 1 1 1 1 1 a3 0 0 1 1 1 1 1 1 1 0 1 1 0 a2 0 1 0 0 0 1 1 1 1 1 0 0 0 a1 0 1 0 0 0 0 0 1 1 1 1 1 1 a0 1 1 0 0 1 0 1 0 1 0 1 0 1 Remarks Ring Start Reset Control Initialization Code Line Threshold Current 12mA Line Threshold Current 4mA Dgls(1) 10dB Dgls(2) 15dB Dgls(3) 20dB Dgls(4) 25dB Transmit Gain -6dB -21dB Attenuation in Ring Mode Oscillator Stand-by Ring Melody Control
15/24
TEA7092
MICROCONTROLLER INTERFACE (continued) HFIN Input Selection For answering machine or cordless connection it can be requested to select HFIN input without enabling the loudspeaker. For this the following procedure should be sent : - Handsfree code 0110010. - Tx & Rx mutes 0010010. - HFIN input select 0110111. To go back to handsfree mode, send : - Speech code 0010000. To go back to handset mode, send : - Speech code 0010000. - Handset code 0110000. The Loudspeaker Control Code
Codes a6 0 0 0 0 0 0 0 0 a5 1 1 1 1 1 1 1 1 a4 0 0 0 0 0 0 0 0 a3 0 0 0 0 0 0 0 0 a2 0 0 0 0 1 1 1 1 a1 0 0 1 1 0 0 1 1 a0 0 1 0 1 0 1 0 1 Gmax -28dB Gmax -24dB Gmax -20dB Gmax -16dB Gmax -12dB Gmax -8dB Gmax -4dB Gmax Remarks
Loudspeaker Level Control
The Data Codes These codes are used in three different ways, depending of the operating code sent after the data codes : - In DTMF dialing : Data code+Dialing code - In Single sine wave : Data code+Sine wave high frequencies (or Sine wave low frequencies) - In Ring mode, to program the Fi parameter, the Data code is following by the divider code n. Fi and n codes fix the ring output frequency.
Codes a6 a5 a4 a3 a2 a1 a0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Key "2" "1" "A" "3" "8" "7" "C" "9" "5" "4" "B" "6" "0" "*" "D" "#" DTMF Dialing Mode DTMF Frequencies 1336Hz 1209Hz 1633Hz 1477Hz 1336Hz 1209Hz 1633Hz 1477Hz 1336Hz 1209Hz 1633Hz 1477Hz 1336Hz 1209Hz 1633Hz 1477Hz + 697Hz + 697Hz + 697Hz + 697Hz + 852Hz + 852Hz + 852Hz + 852Hz + 770Hz + 770Hz + 770Hz + 770Hz + 941Hz + 941Hz + 941Hz + 941Hz Sine Wave Generator Fi
348 or 604Hz
19455Hz
426 or 738Hz 385 or 668Hz
23551Hz 21308Hz
470 or 816Hz
26321Hz
16/24
TEA7092
MICROCONTROLLER INTERFACE (continued) Programmable Divider for Ring Frequencies
Ring Frequencies Fi codes (Hz) / * Notes (Hz) Divider Codes 1010000 1010001 1010010 1010011 1010100 1010101 1010110 1010111 1011000 1011001 1011010 1011011 1011100 1011101 1011110 1011111 1100000 1100001 1100010 1100011 1100100 1100101 1100110 1100111 n 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 26321 23551 21308 19455 Divider 000XX10 000XX11 000XX00 000XX01 Codes 1645 1548.3 1462.3 1385.3 1316 1253.4 1196.4 1144.4 1096.7 1052.8 1012.3 974.8 940 907.6 * 877.4 849.1 822.5 797.6 774.1 752 731.1 711.4 692.7 674.9 1471.9 1385.3 1308.4 1239.5 1177.5 1121.5 1070.5 1024 981.3 942 905.8 872.3 841.1 812.1 * 785 759.7 * 736 713.7 692.7 672.9 654.2 636.5 * 619.8 603.9 1331.7 1253.4 1183.8 1121.5 1065.4 1014.7 968.5 926.4 887.8 852.3 819.5 789.2 761 734.8 710.3 687.3 665.9 645.7 626.7 608.8 591.9 575.9 560.7 546.4 1215.9 1144.4 1080.8 1023.9 972.7 926.4 884.3 845.9 810.6 778.2 748.3 720.6 * 694.8 670.9 648.5 627.6 608 589.5 572.2 * 555.9 540.4 525.8 512 498.8 1101000 1101001 1101010 1101011 1101100 1101101 1101110 1101111 1110000 1110001 1110010 1110011 1110100 1110101 1110110 1110111 1111000 1111001 1111010 1111011 1111100 1111101 1111110 1111111 n 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 Ring Frequencies Fi codes (Hz) / * Notes (Hz) 26321 23551 21308 19455 000XX10 000XX11 000XX00 000XX01 * 658 642 626.7 612.1 598.2 584.9 572.2 560 548.3 537.2 526.4 516.1 506.2 496.6 487.4 478.6 470 461.8 453.8 446.1 * 438.7 431.5 424.5 417.8 * 588.8 574.4 560.7 547.7 535.2 * 523.4 512 501.1 490.6 480.6 471 461.8 452.9 444.4 436.1 428.2 420.5 413.2 406 399.2 * 392.5 386.1 379.8 373.8 532.7 519.7 507.3 * 495.5 484.3 473.5 * 463.2 453.4 443.9 434.9 426.2 417.8 409.8 402 394.6 387.4 380.5 373.8 * 367.4 361.1 355.1 * 349.3 343.7 338.2 486.4 474.5 463.2 452.4 442.2 432.3 422.9 * 413.9 405.3 397 389.1 381.5 374.1 367.1 360.3 353.7 347.4 341.3 335.4 * 329.7 324.2 318.9 313.8 308.8
If requested, the high frequencies corresponding to n varied between 1 to 15 or Divider codes 100XXXX are accessible. Operating Modes TheTEA7092 can work in 1 of the 3 modes : - Handset, - Group listening, - Handsfree. In each mode the operating codes determine the operations held by the circuit as soon as this code is received : For instance DTMF dialing begins as soon as the dialing code is received. The configuration codes operate in each mode of operation : for instance if the No AGC code is sent, the AGC inhibition will work in the 3 modes : Handset, Group listening and Handsfree. DTMF Dialing To dial in DTMF the following code sequence is sent : - DTMF : 000XXXX. - Dialing code : 0010001. - Mute or SPEECH code : 0010010 or 0010000 (to end DTMF mode). The duration of the DTMF signal is fixed by the duration between DIALING code and MUTE or SPEECH code
Note : DTMF code automatically mutes the microphone.
Sine Wave Codes To generate a melody the following sequence of codes is sent : - Frequency code : 000XXXX. - SINE WAVE code : 0011101 or 0011110 (low or high frequency). - SPEECHcode: 0010000(toend SINEWAVEmode). The duration of the melody is being set by the duration between SINE WAVE code and SPEECH code.
Note : SINE WAVE code automatically mutes the microphone.
PULSE Dialing The pulse dialing function is performed by the microcontroller through the high voltage stage. The voltage over the TEA7092 during dialing can be reduced by sending the MASK code 0010101. To recover the normal speech voltage at the end of dialing the mask code must be sent again.
17/24
TEA7092
MICROCONTROLLER INTERFACE (continued) RING Mode - Ring frequency generator : In ring mode, to generate the ring melody in the loudspeaker, the following sequence is sent : * LOUDSPEAKER LEVEL : 0100XXX. * Fi DATA : 000XXXX. * DIVIDER DATA : 1XXXXXX. * GROUP LISTENING CODE : 0110001. * RING START : 0010001. * SPEECH : 0010000 (To stop the ring mode when off-hook is detected, PON = 1). To change the ring frequency only Fi data and divider data are sent again. - Ring indicator input (RI/VI) : In ring mode the TEA7092 generates a high logic level on pin RI/VI, as soon as the voltage on pin RSU is higher than 19V, and the voltage on pin VRMC is higher than 2.6V. When the voltage on pin VRMC is higher than 2.6V, the RESET output goes high. Ring Melody Control The melody can be checked in off-hook by sending the following sequence of codes : - LOUDSPEAKER LEVEL : 0100XXX. - Fi data : 000XXXX. - DIVIDER data : 1XXXXXX. - RING MELODY CONTROL : 0110011. To change the melody or the level, only loudspeaker level, Fi data and n divider data have to be sent. To stop the ring melody, a speech code 0010000 is sent. Figure 9 : Time Diagram of Transfer Request
Transfert Request
Error Beep Error beep could be used to signalize wrong operations (memory empty, re-dial empty, store too many digits in a memory...) or for other procedures, like melody. To generate the error beep, the following sequence of codes is sent : - Fi data : 000XXXX. - DIVIDER data : 1XXXXXX. - ERROR BEEP code : 0011100. To stop the error beep a speech code 0010000 is sent. The error beep is a square wave sent on the earphone, if it is requested to send it also in the loudspeaker, the Group listening code should also be sent. Line Current Variation Detection The TEA7092 has a line current variation detector. This feature memorizes the line current value. When the transfer request code is sent, and if a the current inside the TEA7092 decreases of 15% or more of the line current value, due for example to a telephone set off-hooked in parallel on the same line, the output RI/VI goes HIGH to prevent the associated microcontroller. Oscillator should be ON, and it is preferable to mute the transmit and receive paths to avoid current variation due to ac signals. - TRANSFER REQUEST : 0011010. If the Transfer request code is sent again, the current memorization is disabled.
P Send the Code (0011010)
RI/VI
t0 Line Current Memorization Activated
Flip-Flop Operating
Line Current Variation (if > 15% of IL)
P Send the Code (0011010)
7092-11.EPS
RI/VI
t0 Line Current Memorization Activated Line Current Memorization Cancelled
18/24
TEA7092
COMPONENT LIST
Reference DC Mask RS RSLP RZ Tx Path RGT RSOFT Rx path RGR1 RGR2 CDT CDT2 A.G.C. RLL RSL RLL1, RSL1 RLL2, RSL2 15k 4.7k 0 30k 39k 39k 47nF/1% 3.3nF 1540 51k 82k 2.2k 620 Part Reference CLL, CSL R1 R3 R4 R5 R6 R7 R8 R9 R10 R11 R17 R23 R25 R27 R29 R39 R40 R41 Resistors 220k 30 3k 3k 220k 100k 1.5M 1.5M 10k 12k 220k 2k 2k 910k 30k 1.5k 47k 30k Part 33pF Reference Rring RLS Rear C1 C2 C3 C4 C5 C6 C7 C8 C9 C15 C16 C17 C18 C22 C24 C25 Part 47 50 300 68F/16V 470F/6V 10F/63V 47nF 47nF 470nF 1nF 10F/6V 47nF 220nF 220nF 470nF 1F 47nF 47nF 47nF Quartz D1,D2, D3, D4 DS1 DS2 Z1 Z2 Z3 Q1 Q2 Q4 M1 L1 Reference C26 C27 C30 C38 C41 C44 Others 1N4004 BYW10-60 BAT43 BZX55C 47V BZX55C 8.2V BZX55C 12V BC556B BC546B BF393 BSS 92
7092-05.TBL
Part 100F/16V 150nF 1F 22nF 470pF 47F/6V
Return Loss
Capacitors
DTMF Path
Sidetone Networks
1mH (R < 4/Imax = 400mA) 3.58MHz (Ri < 100)
19/24
TEA7092
Test 1
RLL2 CL IL RL VL R3 R5 C1 6 RZ RS
3 19 16 15
ZALL
R4
CLL IP ON RS L2 CS L C1 5 ZAS L To P in S W2 VC C
12
IRES ET
IR I
Lo gic Co ntr ol
S W3
11 14 13 10
VR I/VI
C4 4 LSOUT 44 R6 LSSOF 6 C6 LSIN 5 REOUT 20 C5 C1 8 R1 7 ASQ 17 C1 7 C4 C9 RLS IVLS
7092-12.EPS
DATA
RECIN
SNSL
PON
30 VS 26 VC C 22 HFIN 40 RS U 39 S WP 38 VZP
TEA7092
RESET
VL
SNLL
RI/VI
CLK
ASC 18
28 S OFTL
VREFL 4 DTMF1 DTMF2 TSOFT AGND GREC EAR+ MIC1 MIC2 EARGND RCO GTR VRMC
8
OSC
VREF
SLP
32
43
25
29
31
23
24
27
21
7
42
37
35
36
33
34
41
9
CDT1
CDT2
3.58MHz
C26
C30
C25
RSLP
C24
RGT
REAR
RLL
RGR2
RGR1
R23
RSL
R29
VMC
ILL
ISL
IREF
VLS 1
2
VMC IVMC + +
VRMC IVRMC +
VLS
Test 2
IL + iAC CL IL VAC VL R3 R5 C1 6 RZ RS
3 19 16 15
RSOFT
R27
RLL2 R4 CLL
C27 ZALL
Grl = 2 0 log
Ve a r VL
a t ILL, Grs = 20 log VL (0 0 10 0 0 0) VL (0 0 10 0 1 0) Z + 6 00 Z - 600
Ve a r VL Z=
a t ILm VAC IAC
RS L2 CS L C1 5
ZAS L To P in VC C
Lo gic Co ntr ol
7 Bit S erial Cod e 1 0 0kHz
Mea r = 20 log
Rlos s = 2 0 log
12
11
14
13
10
DATA
SNLL
RI/VI
CLK
RECIN
SNSL
PON
RESET
VL
30 VS 26 VCC 22 HFIN
LSOUT 44 LSS OF 6
C4 4 R6 RLS
7092-13.EPS
VHP
C6 LSIN 5 REOUT 20 C5 C1 8 R1 7 ASQ 17 C1 7 VREFL 4 DTMF1 C4 C9
C2 2
40 RSU 39 SWP 38 VZP 28 SOFTL
TEA7092
ASC 18
AGND
DTMF2
TSOFT
GREC
EAR+
MIC1
MIC2
GND
EAR-
RCO
GTR
VREF
SLP
VRMC
OSC
VMC
ILL
ISL
IREF
VLS 1 C1
32
43
25
29
31
23
24
27
21
7
42
37
35
36
33
34
41
9
2
8
CDT1
CDT2
VEAR RLL RSL
C26
R27
C27
3.58MHz C2
RSOFT
RSLP
C24
RGT
REAR
RGR2
RGR1
R25
R29
R23
C30
C8
20/24
C25
TEA7092
Test 3
Vhfin = 0 V at 20 mA, Ve m = 0 V IL + iAC CL IL RL VL R3 R5 C1 6 RZ RS
3 19 16 15
RLL2 R4 CLL
ZALL
VL at ILL Ve m VL Gts m = 20 log a t 9 0 mA Ve m Grl = 20 log
RSL2 CSL C1 5
ZAS L To P in VCC
Logic Con trol
7 Bit Se rial Co d e 1 0 0 kHz Mmic= 20 log VL (0 0 1 0 00 0 ) VL (0 0 1 0 01 1 ) , Gh fm = 2 0 log VL Vhfin
Eff = 20 log
12 11 14 13 10
Ve a r Ve m
DATA
RI/VI
CLK
RECIN
SNSL
PON
RESET
VL
30 VS 26 VC C 22 HFIN
SNLL
LSOUT 44 LSS OF 6
C4 4 R6 RLS
VHP
C6 LSIN 5 REOUT 20 C5 C18 R1 7 ASQ 17 C17 VREFL 4 DTMF1 DTMF2 TSOFT C4 C9
C22
40 RS U 39 S WP 38 VZP 28 S OFTL
Vhfin
TEA7092
ASC 18
AGND
GREC
EAR+
MIC1
MIC2
EAR-
GND
RCO
GTR
VRMC
OSC
VREF
SLP
VMC
ILL
ISL
IREF
VLS 1 C1
32
43
25
29
31
23
24
27
21
7
42
37
35
36
33
34
41
9
2
8
C24
CDT1
CDT2
Ve m R27
VEAR RLL RSL
C26
C27
3.58MHz C2
RSOFT
RSLP
RGT
REAR
RGR2
RGR1
R25
R29
R23
C30
C8
7092-14.EPS
Test 4
RLL2 RLL1 IL VL R3 RSL1 C16
RZ RS
3 19 16 15
C25
ZALL Gls = 20 log
VHP VAC
P ls =
VHP 2 RLS
CLL
RS L2 CSL C15
ZAS L To P in VCC
Logic (011001/0100000) Co n tro l 100kHz
7 Bit S erial Code
VHP (Ve m = -75dBV) Dgls = 20 log VHP (Ve m = -65dBV) VHP (code 0100111) VHP (code 0110000)
MuteLS = 20 log
12
11
14
13
10
DATA
SNLL
RI/VI
CLK
RECIN
SNSL
PON
RESET
VL
30 VS 26 VCC 22 HFIN 40 RS U 39 S WP 38 VZP
LSOUT 44 LSS OF 6
C44 R6
RLS
7092-15.EPS
VHP VAC
C6 LSIN 5 REOUT 20 C5 C18 R17 ASQ 17 C17 VRE FL 4
DTMF1 DTMF2 TSOFT
TEA7092
C9
ASC 18
28 S OFTL
C4
AGND
GREC
EAR+
MIC1
MIC2
EAR-
GND
RCO
GTR
VRMC
OSC
SLP
VREF
VMC
ILL
ISL
VLS 1 C1
IREF
29
32
43
25
31
23
24
27
21
7
42
37
35
36
33
34
41
9
2
8
C24
CDT1
CDT2
Ve m
R27
VEAR
RLL RSL
C27
3.58MHz
RSOFT
RSLP
RGT
RGR2
RGR1
REAR
R29
R23
C26
C30
C2
C8
C25
21/24
TEA7092
Test 5
Logic Con tro l
3 19 16 15 12 11
7 Bit Se rial Code 100kHz VRI
10
DATA
RECIN
SNSL
PON
RESET
VL
30 VS
SNLL
RI/VI
CLK
RR ING R11
14
13
IRI
C44 LSOUT 44 R6 LSSOF 6 RLS
7092-16.EPS
R1
Q1 C3 Q2
IRING
+ VRING
26 VCC 22 HFIN
VHP
+ VRS U R39 Z2 IRS U
40 RSU
LSIN 5
C6
TEA7092
39 SWP
REOUT 20 ASC 18 ASQ 17 VREFL 4 C4
VSWP
38 VZP
DTMF1
DTMF2
TSOFT
AGND
GREC
MIC1
MIC2
EAR-
GND
RCO
VZP
GTR
VRMC
OSC
SLP
VREF
VMC
ILL
ISL
28 SOFTL
EAR+
I(VZP )
IREF
VLS 1 C1
32
43
25
29
31
23
24
27
21
7
42
37
35
36
33
34
41
9
2
8
3.58MHz
C38 L1 I(VLS ) VRC O C41 R41
C8
DS1
22/24
VLS
R9
1F RLL2 R10 R4 CLL RLL1 ZALL
2.2k DS2
M1
R7
D1
D2
R8
Hookswitch Z3
TYPICAL APPLICATION
LINE
D3 Q4 RSL2 R3 CSL C16
3 19 16 15 12 11 14 13 10
D4
KEYBOARD
MICROCONTROLLER
ZALC RSL1 To Pin VCC
+ RING C15
+ LINE
R5
RZ
Z4 CLK PON SNLL SNSL RECIN RESET DATA VL
RI/VI
LSOUT 44 LSSOF
6
C44 R6 Loudspeaker
R1
R11
Q1
30 VS
RS
C6 LSIN 5 C5 REOUT 20 ASC 18 C18 R17 ASQ 17 C17 VREFL 4 GREC EAR+ EARILL ISL RCO OSC VMC VRMC VLS 1
37 35 36 33 34 41 9 2 8
Q2
26 VCC 22 HFIN 40 RSU 39 SWP 38 VZP
TEA7092
R39
R40
R38 AGND GND
28 SOFTL
C4
VREF IREF
SLP
MIC1
MIC2
TSOFT GTR
DTMF1
DTMF2
32 31 7
43
25
29
23
24
27
21
42
C1
C3 R29 RGT RSOFT RSLP Microphone C27
RSL
3.58MHz
C26
RGR1
R27
CDT1
C25
L1
CDT2 RGR2
R41
C41
Z1
Z2
DS1
Earphone RLL
C30
C38
C2
C8
TEA7092
23/24
7092-17.EPS
TEA7092
PACKAGE MECHANICAL DATA 44 PINS - PLASTIC QUAD FLAT PACK (THIN)
D D1 D3 A1
33 34 23 22
0.10mm .004 Seating Plane
A A2
E3
E1
B
44 1 11
12
E
B C L
e L1
K
TF4 QP
Dimensions A A1 A2 B C D D1 D3 e E E1 E3 K L L1
Min. 0.05 1.35 0.30 0.09
Millimeters Typ.
1.40 0.35 12.00 10.00 8.00 0.80 12.00 10.00 8.00
Max. 1.60 0.15 1.45 0.40 0.20
Min. 0.002 0.053 0.012 0.004
Inches Typ.
0.055 0.014 0.472 0.394 0.315 0.031 0.472 0.394 0.315 0.024 0.039
Max. 0.063 0.006 0.057 0.016 0.008
0.45
0.60 1.00
0.030
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No licence is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without noti ce. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. (c) 1996 SGS-THOMSON Microelectronics - All Rights Reserved Purchase of I2C Components of SGS-THOMSON Microelectronics, conveys a license under the Philips I2C Patent. Rights to use these components in a I2C system, is granted provided that the system confo rms to the I2C Standard Specifications as defined by Philips. SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
24/24
TQFP44A.TBL
0o (Min.), 7o (Max.) 0.75 0.018
PMTQFP44.EPS

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