TEA7088A-TEA7088AFP Fast Delivery |IC PHOENIX CO.,LIMITED

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TEA7088A-TEA7088AFP
LOW-RANGE PHONE DEDICATED CHIP
TEA7088A
LOW-RANGE PHONE DEDICATED CHIP
January 1998
SO28
(Plastic Package)
ORDER CODE: TEA7088AFP RING GENERATION OF8 MELODY TONES
(Including the3 German Melody Tones)4 STEPS DIGITAL CONTROL ON THE AM-
PLIFIER OUTPUT LEVEL. SPEECH TRANSMITGAINEXTERNALLY ADJUSTABLE RECEIVINGGAINEXTERNALLYADJUSTABLE AGCSLOPEEXTERNALLYPROGRAMMABLE SOFTCLIPPING ON SENDING CHANNEL RECEIVE AMPLIFIER FOR PIEZO OR
ELECTRODYNAMIC TRANSDUCER +6dB MODE ON RECEIVE CHANNEL LINE POWER MANAGEMENT. DIALING DTMF GENERATOR LOW DC MASK DURING MAKE PERIOD
THROUGH MICROCONTROLLER SERIAL
BUS INTERFACE. MICROCONTROLLER INTERFACE 1.79MHzCLOCK OR3.58MHzOSCILLATOR
INPUT. MICROCONTROLLER POWER SUPPLY. MICROCONTROLLER CONTROL INTER-
FACE INCLUDING SERIAL BUS. LINE CURRENT EXTRACTOR FOR SUPPLY EXTERNAL PERIPHERALS
DESCRIPTION
The TEA7088Aisa Telephone Analog Front End
device, TAFE, which integrates the three basic
functionsofa standard telephone set: Speechnetwork, DTMF generator, Ringer generatoron buzzer. complete telephone set can be designed using
TEA7088A associated witha low cost microcon-
troller.
MIC2
DTMF
VREF
VRMC
DCL
DATA
PON
RES
SOFT
RECIN
GTR
MIC1
AGC
VCC
IVLS
GND
MSK
OSCMC
GREC
BUZ
EAR+
EAR-
VRING
88A
PIN CONNECTIONS
1/17
PIN DESCRIPTION
Name PinN° Description
SOFT 1 Transmit Softclipping Time Constant
RECIN 2 Receiving Input 3 Sidetone Network Input
AGC 4 Line Current Regulation Stop Value
MIC1 5 Microphone Input
MIC2 6 Microphone Input
GTR 7 Transmit Gain Adjustment
VCC 8 Transmit and Receive Part Power Supply
GND 9 Ground
IVLS 10 Line Current Source Power Supply 11 Voltage Stabilizer 12 Positive Line
VMC 13 Unregulated Microcontroller Power Supply
GREC 14 Receive Gain Adjustment
EAR- 15 Negative Earphone Output
EAR+ 16 Positive Earphone Output
BUZ 17 Ringer Buzzer Output
VRING 18 Ring Power Supply
RES 19 Reset
PON 20 PowerOn 21 Ring Indicator
OSC 22 Oscillator Input
MSK 23 Mask, Ring Melody Input
DATA 24 Data Input
DCL 25 Data Clock Input
VRMC 26 Microcontroller Stabilized Power Supply
VREF 27 Reference Voltage (VCC/2)
DTMF 28 DTMF Filter
SPEECH
The speech network includes:a low noise transmitchannelsuitablefor any kind microphone transducer.Softclippingon trans-
mit line signalis providedby the chip.a low noise receive channel with symmetrical
outputstobe compatible with both piezoceramic
and electrodynamic earpiece. An additional 6dB
gain can be insertedin the receive channel
throughsoftware control.a linelength gain control(AGC) with startingpoint gainregulation fixedat 25mAline current; slope gainregulationis externallyadjustablewith one
resistor.AGCcanbe removedby hardware (maxi-
mumgain flat)orby software(-2dB flat).
The phone impedance and sidetonecanbe tuned
through external networks.
DTMF GENERATOR
The onboard DTMF generator fullfils the CEPT
requirements withan external single pole filter.
RINGERto8 different tones can be generatedby the
TEA7088Aringer. The digital volume controlof the
ringer can be performed througha specific com-
mand(4 steps). Aring indicationsignalis provided the microcontroller by the TEA7088A.If more
tones are requested the input RM/MSK allowsto
inject tones generatedby the microcontroller.
FURTHER ADVANTAGES
The microcontroller power supplyis providedby the
TEA7088A.Thepower supplyis specificallydesigned copewitha longflashora longgroundkey duration.
The TEA7088Ais ableto supply the necessary
current to an external speakerphone circuit
TEA7540 and loudspea ker amplifier TEA7532
without any additional circuitry.
Line current and reset indications are providedto
the microcontrollerby the TEA7088A.
The microcontroller drives the TEA7088A through2 wires serial interface.
TEA7088A
2/17
EAR+ MIC2 67 151618 242526
REF
AGC
KVL
EarphoneAmplifier
MIC1
cro
GTRR4
SOFT
DTMF
AGC
R25
EAR-
hone
R17R14
C14
GREC
REF
AGC
MUTE
SIDETONE
AGC
REF
VSTAB
LINE
CURRENT
POWER
SUPPLY
C11
R12R11
Line
R10
C30
R13
C12
Sidetone
IVLS
RECIN
PON
RESET
CONTROL
PON
RES
SERIAL
REGULATOR
OSCILLATOR
INTERFACE
DTMF
GENERATOR
MSK DCLDATAV
RING
GENERATOR
MUTE
CONTROL
BUZ
LOGIC
POWER
SUPPLY
RING
POWER
SUPPLY
RMC
RING
BUZZER
AMPLIFIER OSC
3.58MHz
RESONATOR
1.79MHzEXT.
CLOCK
C10C15C16
R40
R15
Line
GND
TEA7088A
088A
Figure1: Block Diagram
TEA7088A
3/17
ELECTRICAL CHARACTERISTICS
The block diagramis givenin Figure1.
The valuesof the different networks usedin this datasheetare definedas followed: The return lossis adjustedby R10of 600Ω. The transmit adjustgainnetworkR8is calculatedin orderto havea gainof 46dB typical withILS= 22mA. The sidetone network ZSTis settobe lower than 20dB (Vear/Vmic)ona 600Ω loadon line. The DC characteristics are setbya resistorof 82kΩ betweenVL and VS.
Absolute Maximum Ratings
Symbol Parameter Value Unit
Authorized Voltageon
Pin2- RECIN
Pin3- SN
Pin8- VCC
Pin 10- IVLS
Pin 12-VL
Pin 13- VMC
Pin 17- BUZ
Pin 18- VRING
Pin 19- RES
Pin 20- PON
Pin 21-RI
Pin 22- OSC
Pin 23- MSK
Pin 24- DATA
Pin 25- DCL
Pin 26- VRMC
VRING +0.3, GND -0.3
VRMC +0.3, GND -0.3
VRMC +0.3, GND -0.3
VRMC +0.3, GND -0.3
VRMC +0.3, GND -0.3
VRMC +0.3, GND -0.3
VRMC +0.3, GND -0.3
VRMC +0.3, GND -0.3
ILINE Line Current 120 mA
IRING Ring Current 50 mA
Toper Operating Temperature -25, +70 °C
Tstg Storage Temperature -55, +150 °C Junction Temperature -25, +150 °C
088A
2.T Characteristics (Tamb =25°C; Logicin Default Mode unless otherwise noted)
Symbol Parameter Test Conditions Min. Typ. Max. Unit Line VoltageIn Speech and DTMF ModeIn Mask Mode
Test1= 22mA= 90mA= 22mA
IVRMC Stabilized Supply Voltage Output Current
Test 1,IL= 22mA
1.5 mA
VRMC - Output Voltage IRMC= 1.5mA 3.15 3.35 3.55 V
IVMC Unstabilized Supply Voltage Startup Current Output Current
Test 1,IL= 22mA
VMC= 2.5V, IVRMC= 1.5mA
VMC= 3.6V, IVRMC= 0mA 15
ILS Line Current Source Supply Test 1,VLS =0V ;VMC= 3.6V= 22mA= 90mA
The line current source supply dependsofIL: ForIL< 20mA: ILS (mA)= 0.765xIL (mA)- 1.4mA ForIL> 20mA: ILS (mA)= 0.92xIL (mA)- 4.5mA this pin the maximum output levelis: V10 =V12- (1.2+10x ILS) and V10 <6V
TEA7088A
4/17
ELECTRICAL SPECIFICATIONS (continued) Characteristics (Tamb =25°C;RL= 600Ω; Logicin Default Mode unless otherwise noted)
Symbol Parameter Test Conditions Min. Typ. Max. Unit Return Loss Test2,IL= 22mA= 300/3400Hz,VAC= -10dBV dB
TransmitCharacteristics
(Tamb =25°C;RL= 600Ω;f= 1kHz; Logicin Default Mode unless otherwise noted)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
Gtx
Gtxl
Gtxs
Microphone Gain Test3,Vm= -55dBV= 1.3kΩ, R25= 3.9kΩ= 22mA= 90mA
Zmic Microphone Input Impedance between MIC1& MIC2 32 40 48 kΩ
Ntx Noise Test3, 2kΩon microphone inputs,= 22mA
-76 dBmp
Mmic Microphone Mute Test3,Vm= -55dBV,IL= 22mA 60 dB
Dtx Max.
Soft Clipping Distortion Maximum Levelon Line
Test3,IL= 22mA, see Figure2= -41dBV= -34dBV 1.5
The maximum gain Gtlis adjustable between44
and 56dB with R8:
Gtxl= 20log
820⋅ R10//RL+ R11// 50kΩ
TheAGCvariationis programmedwithoneresistor
connectedon Pin AGC. ISLis the line currentat
which the gain mustbe decreasedby 6dB.
R25 (Ω)= 300
ISL− 5mA (R25> 2.6kΩ)
For line current lower than ILLor higher than ISL,
The transmit and receive gains havea constant
value. no resistorora resistor higher than 300kΩis
connectedon Pin AGC, the gainis constant and
equalto Gtxl and Grxl. ±0.5dB.
AGC can be inhibited also through MCU code
”010100”.In this caseTx and Rx gains are fixed
2dB lower than the maximum gain.
The minimum saturation voltageof the TEA7088A
respectto groundis 2.2V. On long line, when the
voltage over TEA7088Ais low, the softclipping
function automatically limits the AC dynamicto
avoidto reachthe 2.2V limiton TEA7088Arespect ground.
0.1 1 10 1000.1
Threshold
Level
Vmicrophone peak (mV)
peak
line
(V)
.EPS
Figure2: Softclipping 20 406080 100
(Pin
12)
(V)
VAC peak (mA)
VAC peak
88A
Figure3
TEA7088A
5/17
ELECTRICAL SPECIFICATIONS (continued)
Receive Characteristics (Tamb =25°C;RL= 660Ω;f= 1kHz)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
Eff Sidetone
Eff= (Vear+- Vear-) /Vm
Test3,Vm= -55dBV,IL= 22mA,
R14= 10kΩ, R17= 15kΩ
22.5 dB
GRXl
GRXs
Gainin Symmetric Mode
Grx= (Vear+- Vear-)/VL
Test6,VL= -14.5dBV, R14= 10kΩ,
R17= 15kΩ, R25= 3.9kΩ= 22mA= 90mA
0.7 1.7
2.7 Distortion Test4, Rear= 300Ω,IL= 22mA
Vear= -12dBV
Vear= -8dBV Noise Test4,IL= 22mA -76 dBmp
Vear
(010010)
Earphone Mute IL= 22mA,VL= -14.5dBV 60 dB
Zout Output Impedance 20 Ω
Automatic Gain Control Inhibition (Tamb =25°C; RL= 660Ω;f= 1kHzno AGCmode selected)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
Gtp
Grp
Transmit Gain
Receive Gain
Test3 &Test4,IL=22 to90mA
Code: 010100= -55dBV= -14.5dBV
Gtxl-3
Grxl-3
Gtxl-2
Grxl-2
Gtxl-1
Grxl-1
Ring Characteristics (Tamb =25°C)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VThriON
VThriOFF
Ringing Threshold Voltage Test5 a/b high (see Figure4) low (see Figure4)
ICRing Internal Consumptionin Ring
Mode
VRING= 10V 1 1.2 mA
VRMC Microprocessor Supply Voltage 3.45 3.75 4.05 V
tRON Rise Time IRING= 10mA 100 ms
VRING Internal Zener Voltage 27 V
Vbout Buzzer Vout
Freq= 1312Hz
Freq. Code 001111
VRING= 27Vzener (see Figure5)
Level Code (011111)
Level Code (011110)
Level Code (011101)
Level Code (011100)
VRMS
VRMS
VRMS
VRMS
Vbout
Figure5: Ringer Output Waveform
OFF
Ringer
Status
VOFF VON V
RingerThreshold (VTHRI)
88A
Figure4: RingerHysteresis Ringer
TEA7088A
6/17
ELECTRICAL SPECIFICATIONS (continued)
DTMF Generator(Tamb =25°C; RL= 660Ω)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
Amf Tone Frequency Accuracy Test6 Pin Osc
fclock= 1.79MHz oscillatoroff
Resonator :3.58MHzoscillatoron
C13 =100nF,IL= 22mA0.4 0.4 %
Llf
Lhf
Low Freq. Group Line Level
High Freq. Group Line Level
dBm
dBm
Pmf Preemphasis HF/LF +1 +2 +3 dB
tDON
tDOFF
Rise Time
Decay Time
Cmf DTMF Confidence Tone:
Earphone level (low freq.)
Earphone level (high freq.) - Unwanted Harmonics Level (see Figure6) ––––
100 1k 10k 100k 1M-90
Vline
(dBm)
(Hz)
7.EPS
Figure6: Unwanted Harmonics Levelin DTMF
VREFI Start-upI Speech
I(In Ring)
VRINGRMC (3.4V)
C15
10 F
+LCD
C10
47 F 5.6VMC
Battery
kIL
8.E
Figure7: Microcontroller Interface
TEA7088A
7/17
MICROCONTROLLER INTERFACE WITH TEA7088A
All inputs can be driven bya Low level max.of
0.1x VRMC anda high level min.of 0.9x VRMC.
Inputs MSK, DCL and DATA have internal pull-up
resistorsof 120kΩ and input OSC hasa internal
pullupof 240kΩ.
All outputs can drivea ±1mA typical.
Power Supply
The microcontrolleris power suppliedbya 3.4V
regulated supply (VRMC) and by an unregulated
power supply (VMC).
The two supplies are connected througha serial
regulator.The unregulatedpower supply (VMC) has DC voltageequalto: V12 -0.6V and must belower
than 6V.Itis also possibleto connecta batteryat
Pin VMC and use the regulated outputat Pin VRMC supplya LCDdriver.
The current consumption on the serial regulator
hasa typical valueof 60μA.
Power ON (PON)
TheTEA7088Ageneratesa poweron signal(PON) soonas the voltageon Pin VRMCis higher than
2.6V (0.75x VRMC final)and the line currentis pre-
sent.
Note: Du ring the b reak period in the
loopdisconndect and Flash mode and
during the exchange line break, the power
ONsignal goesto lowlevel.Maximum delay
for Pon decay edge after ILine goesto zero 50ms (with C8= 47μF, C11= 1μF,
C27= 10μF).
Reset
The TEA7088Ageneratesa rise edge Reset signal soonas the logic power supplyis higher than
2.6V (0.75x VRMC final).
RESET remains high until VRMC decreases below
2.5Vor the RESET control codeis received.In
Ring, RESETis identicaltoRI output.
Only new positive edge PON, derivedon opening
and closing the line,is forcing the default mode
again. The Reset control codeis only activein
speech mode.
Serial Bus Interface (Data and Clock)
The serialbus uses6 bits. Astandard8bit buscan used, bitsa6 anda7 are not takein accountby
the TEA7088A.Differenttypesof codes are used: TheRing Control Code: Ring startup Outputlevel codes TheOperating Code: Speech Dialing Microphone mute Earphone/Microphonemute TheData Codes (DTMF, ring frequencies):
Those data codes are stored inside the
TEA7088Aand are usedas soonas the dialing
codeor the ring start codeis received. TheConfiguration Code: AGC/no AGC (toggle) No mask/ mask (Low DCin ”make”) (toggle) Normal gain/ normal gain +6dB, on receive
channel (toggle) 1.79MHz external clock/ 3.58MHz internal
oscillator (toggle)
Those configuration codes are ”Flip-Flop”
codes.
For instance: The first time that the+6dBcode sent, the receive gain increasesof +6dB. the same codeis sent again, the receivegain
goes backto normal value.In thesame way the
3.58MHz internal oscillator can be switched
OFF witha second transmissionof the proper
code. TheRESET Code:
ResetcodefromtheMCU willresetinternallogic TEA7088Ato default mode and will induce
TEA7088Ato generatea ”RESET” status ”low” the MCUon Pin 19.
Warning: the ”RESET” code deactivates the
serial bus interface whichis reactivated only
aftera ”ON-HOOK/OFF-HOOK”sequence. TheINITIALIZATION Code:
Initialization code from the MCU will reset the
internallogicof TEA7088Ato default mode, but
theTEA7088Awill not generatereset command the MCUon Pin 19.
TEA7088A
8/17
VMC
VRMC
PON
RESETBC D DE
Without using the RESET Code through the Serial Bus Interface
Using the RESET Code through the Serial Bus InterfaceL
VMC
VRMC
PON
RESET C D D ED FAtd ON-HOOK: STARTUP+ SPEECH: PULSE DIALING: SPEECHor DTMF: LINE BREAK EXCHANGE DURATION: LINE BREAKEXCHANGE DURATION>td: DELAYFIXED BY THE MICROCONTROLLER
2.5V
2.5V
Reset controlcode (010111)
sentonthe serial bus
9.E
Figure8: Reset and Power ON
MICROCONTROLLER INTERFACE WITH TEA7088A (continued)
TEA7088A
9/17

Partno	Mfg	Dc	Qty	Available	Descript
TEA7088A	ST	N/a	919	avai	LOW-RANGE PHONE DEDICATED CHIP
TEA7088AFP	ST	N/a	28	avai	LOW-RANGE PHONE DEDICATED CHIP