Datasheet TEA7092 Datasheet (SGS Thomson Microelectronics)

TEA7092

TELEPHONE ANALOG FRONTEND

SPEECH

.

DC LINE CURREN T RANGE FROM 6 TO120mA

.

EXTERNALLYADJUSTABLE:

- Tx ANDRxGAIN

- MAXIMUMTRANSMIT LEVEL

- RETURN LOSS

- SIDETONENETWORKS

- Tx ANDRxAGC(LINECURRENT STARTUP
VALUE ANDSLOPE)

.

SOFTCLIPPINGONTxCHANNEL

.

SQUELCH ON Tx CHANN ELT O REDUCE NOISE
ENVIRONMENT AND TO IMPROVE HOWLING
IMMUNITYIN LOUDHEARIN GMODE

.

RECEIVING AMPLIFIER FOR PIEZO AND
ELECTRODYNAMICTRANSDUCERS

.

FREQUENCY GENERATOR FOR WAITING
MELODY

.

ERRORBEEP GENERATOR

.

HOLD LINE CURRENT DETECTOR FOR
TRANSFER/AUTORELEASEFEATURE

.

PROGRAMMABLE BY MICROCONTROLLER
SERIALBUS:

- -6dBON Tx CHANNEL

- +6dBONRx CHANNEL

- AGCINHIBITION ONTx ANDRxCHANNELS
FORPABX USE

- SQUELCHINHIBITION

GROUPLISTENING / ONHOOK DIALING

.

ANTI-HOWLING WITH ACOUSTIC FEED­BACKSYSTEMCOUPLEDTOSQUELCH

.

RING MELODY CONTROL AND ERROR
BEEPGENERATORS

.

PROGRAMMABLE BY MICROCONTROLLER
SERIALBUS:

- DIGITALVOLUME CONTROL (7 STEPS OF
4dB EACH) AND OFF MODE

.

PROGRAMMABLE BY MICROCONTROLLER
SERIALBUS:

- DIGITALVOLUME CONTROL(15STEPSOF
4dB EACH) AND OFF MODE

- RING FREQUENCY GENERATOR (MORE
THAN200 FREQUENCIES AVAILABLE)

DIALING

.

PROGRAMMABLE BY MICROCONTROLLER
SERIALBUS:

- DTMF GENERATOR

- 2V DC LINE VOLTAGE DURING THE MAKE
PERIODIN PULSEMODE

MICROCONTROLLER INTERFACE

.

3.5V STABILIZEDSUPPLY

.

TWO WIRESSERIAL BUS INTERFACE

.

RINGINDICATOR

.

PON LINE CURRENTINDICATOR

.

RESETSIGNAL

.

LINE CURRENT VARIATION INDICATOR
(FOR TRANSFERFEATURE)

.

OSCILLATORWITH STANDBY MODE

CORDLESS AND ANSWERING MACHINE
INTERFACE

.

SELF BIASED LOUDSPEAKER AMPLIFIER
AND MICROCONTROLLER INTERFACE FOR
ANSWERING MACHINE

.

SIGNAL INPUT AND OUTPUT INTERFACE
FOR CORDLESS

.

V

SUPPLYCANBE EXTERNALLYFORCED

RMC

TO 5V FOR EASY INTERFACE WITH A MAIN
POWEREDMICROCONTROLLER

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
AMPLIFIERDURINGRING MODE

July 1996

TQFP44

(Plastic Quad Flat Package)

ORDER CODES : TEA7092TQ - TEA7092TQT

1/24

TEA7092

DESCRIPTION

The TEA7092is a TelephonesetAnalogFrontEnd
(TAFE) interface intended for use in conjunction
with amicrocontroller.
In thisconfigurationthe TEA7092providesaworld­wide telephone set with loudhearing and melody
ringer onloudspeaker.An handsfreetelephoneset
can be built by adding the TEA7540 handsfree
controller.
The simpleinterfacewitha+5Vmainsupplyallows
to use the TEA7092 in terminal like Answering
machine,FAX and cordlessbase 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

GNDP

RCO

V

V

VL

V

REFL

LSIN

LSSOF
DTMF1

V

RMC

OSC
RI/VI

RESET

LSOUT

4443424140393837363534

1

LS

2

MC

3
4
5
6
7
8
9
10
11

1213141516171819202122

The MCU throughthe serial bus interface.
The concept using TAFE and Microcontroller is

calledBICHIPapproach.

BENEFITS

The benefits of this concept are :

- Saving of externalcomponents.

- Easy upgrade of the features (memories, LCD
driver,Answeringmachine, FAX, Cordless ...).

- Replacement of configuration switches
(PABX/Public, Tone/Pulse) and potentiometers
for loudspeakerand ringer control, by EEPROM
settings.

- Reliability and cost improvements.

RSU

SWP

VZP

GREC

EAR-

EAR+

ISL

33
32
31
30
29
28
27
26
25
24
23

ILL
AGND
SLP
VS
I

REF

SOFTL
TSOFT
V

CC

V

REF

MIC2
MIC1

2/24

PON

CLK

DATA

SNSL

SNLL

ASQ

ASC

RECIN

REOUT

GTR

HFIN

7092-01.EPS

PIN DESCRIPTION

Pin Number Name Description

1V
2V

LS

MC

3 VL Transmit Output
4V

REFL

5 LSIN Loudspeaker Amplifier Input
6 LSSOF Loudspeaker Softclipping Time Constant
7 DTMF1 DTMF Filter 1
8V

RMC

9 OSC Oscillator Input
10 RI/VI Ring Indicator / Line Current Variation Indicator
11 RESET Microcontroller Reset Output
12 PON Line Current Indicator Output
13 CLK Serial Bus Clock Input
14 DATA Serial Bus Data Input
15 SNSL Short Line Sidetone Network Input
16 SNLL Long Line Sidetone Network Input
17 ASQ Antiacoustic & Squelch Time Constant
18 ASC DC Offset Cancellation of Squelch Amplifier
19 RECIN Receive Input
20 REOUT Receive Outputfor Handsfree Interface & Loudspeaker Input
21 GTR Transmit Gain Adjustment
22 HFIN Handsfree Microphone Input Referenced to V
23 MIC1 Microphone Input 1 Referenced to V
24 MIC2 Microphone Input 2 Referenced to V
25 V
26 V

REF

CC

27 TSOFT Transmit Softclipping Time Constant
28 SOFTL Softclipping Adjustment
29 I

REF

30 VS Active Self Inductor & DC Characteristic Adjustment
31 SLP DC Mask Slope Adjustment
32 AGND Analog Ground & Negative Line Voltage
33 ILL Long Line Speech Control Adjustment (GMAX)
34 ISL Short Line Speech Control Adjustment (GMAX-6dB)
35 EAR+ Earphone Output
36 EAR- Earphone Output
37 GREC Receive GainAdjustment
38 VZP Switch Mode Power Supply Internal Zener
39 SWP Switch Mode Power Supply Output Switch
40 RSU Ring Start-up Level
41 RCO Ring Power Output Control
42 DTMF2 DTMF Filter 2
43 GND Power Ground & Negative Line Voltage
44 LSOUT Loudspeaker Output

Loudspeaker Power Supply
Unregulated Input of Microcontroller Power Supply

Loudspeaker Reference Voltage (VLS/2)

Stabilized Microcontroller Power Supply

REF
REF

Speech Reference Voltage (VCC/2)
Speech Power Supply

Resistor to Set Reference Current

TEA7092

REF

7092-01.TBL

3/24

TEA7092

BLOCK DIAGRAM

REFL

GND 0V

V

LSSOF

LS

V

LS

V

CC

V

TEA7092

13 4615 161926 30

VLS/2

CTRL

LOGIC

HOLD

ILdc 82.ILac I(vls)

STATUS

I LINE SENSING

ILdc

&OUT TX

LOUDSPEAKER

CURRENT SUPPLY

ILac+dc

DC BIAS

AGC

Gmax-Gtl

A
100

INPUTS

LSOUT

SAT

DETECT

DIGITAL

MUX

44

VOLUME

CONTROL

7 steps 4dB

AGC

+RING

LOUDSPEAKER

GND 0V

POWER

LOUDHEARING

Gtl -10 -15 -20 -25dB

VLS

VZP

38

POWER

RCO

41

RING SIGNAL

OUTPUT POWER

(3mA)

CURRENT

EXTRACTOR

GND 0V

RSU

40

POWER

SWITCH MODE

RING

OPTIMISATION

RING

INDICATOR

DC

SERIAL

REGULATOR

ILdc ILac+dc

SWP

39

SUPPLY

CONTROL

ILdc

PON &

GND 0V

RESET

CONTROL

OSCILLATOR

LOGIC CONTROL

RING

MELODY

GENERATOR

LOGIC

SERIAL INTERFACE

MICROCONTROLLER

MUTE

LS

V

GND 0V

3.58MHz

9

14 13 10111282

RMC

V

PON RESET DATA CLK RI/VI OSC

RMC

V

MC

V

4/24

Zasl

LINE

Zall

VS RECINVL SNSL SNLL

CC

V

ILdc

VCC/2

25

REFIREF

V

ILdc

DC

CARACTERISTIC

I&V

REFERENCES

29

31

SLP

LSIN

5

MIXER

SIDETONE

AGC

20

37

GREC

REOUT

AGC CONTROL

MUTE

VERSUS

LINECURRENT

VREF

36

EAR-

RX & TX

-1

EARPHONE

AMPLIFIER

35

EAR+

EARPHO NE

17

ASQ

ASC

dc cut

VL

18

SOFTL

Tx. AMP

MUTE & DTMF

G=200

SQUELCH

ANTI-HOWLING

SOFTCLIPPING

272824

MIC2

TSOFT

1/RGT

AGC

A=10

23

MIC1

MICRO

HAND-FREE

22

HFIN

C21

21

GTR

333432

ILL

RGT

BEEP

VREF

DTMF

I-DACLF I-DACHF

ISL

AGND

SINE CODE

43

GND

742

DTMF1 DTMF2

GND 0V

7092-02.EPS

TEA7092

ABSOLUTEMAXIMUM RATINGS

Symbol Parameter Value Unit

V

RECIN

V

L

I

L

V

RSU

V

SWP

V

VLS

V

VCC

V

VM

V

VRMC

V

PON

V

CLOCK

V

DATA

V

RI/VI

T

oper

T

T

stg

Note: Typical Thermal resistance TQFP44 Copper lead frame70° K/W @ 1W.

Supply Voltage 13 V
Line Voltage 13 V
Line Current 0.15 A
Ring InputVoltage 22 V
Output SwitchVoltage 7 V
Loudspeaker Part Supply 5.5 V
Speech PartSupply Voltage 10 V
Unregulated Microprocessor Supply Voltage 5.5 V
Regulated Microprocessor Supply Voltage 5.5 V
Power-On Out Voltage V
Clock In Voltage V
Data In Voltage V
RI/VI Out Voltage V

+0.3V, GND-0.3V V

RMC

+0.3V, GND-0.3V V

RMC

+0.3V, GND-0.3V V

RMC

+0.3V, GND-0.3V V

RMC

Operating Temperature -20, +70 °C
Junction Temperature -20, +150 °C

j

Storage Temperature -55, +150 °C

7092-02.TBL

Figure 1 : SafeArea

140
120
100

80

(mA)

L

60

I

40
20

0

02468101214

VL(V)

7092-03.EPS

5/24

TEA7092

DC CHARACTERISTICS (T

BetweenI

) =RS x (40E-6+0.5E-3xIL) +RSLP/55 x (IL- 5.6E-3).

V

L(IL

=8mA and IL= 20mAthe DC slopeis fixed by RS and RSLP :

L

For linecurrenthigherthan20mAthe slopeis fixed by RSLP: V

=25°C,see Test 1)

amb

)=VL(20E-3)+ RSLP/55x(IL- 20E-3).

L(IL

Symbol Parameter Test Conditions Min. Typ. Max. Unit

4.1

4.7

V

V

I

LSQ

Line Voltagein Speech Mode IL= 20mA

L1

Line Voltageafter Having Sent

L2

0010101 Mask Code
Loudspeaker Amplifier Quiescent

Bias Current

Unstabilized Supply :
I(VMC)1
I(V

MC

V

RMC

(V

L-VLS

(V

L-VLS

I

LS1

- Startup Current

)2

- UnregulatedInput Current

Stabilized Microprocessor Supply IL= 20mA, I(V

DropVoltage V

I

LS

)1
)2

Loudspeaker CurrentSupply VLS=2V

RETURN LOSS (T

=25°C,see Test 2

amb

= 90mA

I

L

6.6

IL= 20mA 1.6 2.5 V

VLS= 4.5V 1.1 2.2 mA

= 20 mA, VLSno connect, VMC= 2.4V

I

L

V

RMC

V

RMC

LAC

IL= 20mA
I

L

I

L

I

L

= 2.4V
= 3.75V

=0V

RMS

= 90mA

= 20mA
= 90mA

) = -1.8or 0mA 3.2 3.5 3.75 V

RMC

10215

117013

5.25

7.5

8.4VV

2.7 3.6mAmA

1.1

1.3

1.8

2.3VV

77

Symbol Parameter Test Conditions Min. Typ. Max. Unit

RLoss Return Loss I

= 20mA, f = 1000Hz 20 23 dB

L

mA
mA

7092-03.TBL

7092-04.TBL

TRANSMIT CHARACTERISTICS

The maximum gain Gtl is adjustable between 44
and 56dB versusRGT value

Gtl = 20 x log





= internal impedance at Pin VL#8kΩ.

Z

IN

( RZ// RL + R3 ) // Z

820 x

RGT// 50kΩ



IN




The AGC variation is programmable through two
external resistorsconnected on Pins ILL and ISL.
ILL is the line current at which the gain is at the
maximumvalue and ISLis the line currentat which
the gain is at the maximum value minus 6dB. For
line current lower than ILL or higher than ISL, the
transmitand receivegains have a constantvalue.
The following formulas give RLL and RSL values
versus ILL and ISL.

RSL =

310

ISL− 5.6mA

and RLL =

310

ILL − 5.6mA

Tx Softclipping(see Figure 2)
Figure2 : TxSoftclipping and Distortion

at I

=20mA

L

2

V

LINE

Distortion

1

)

0.5

RMS

(V

L

V

0.2

0.1

0.05

0.2 0.5 1 2 5 10 20 100
(mV

V

MIC1-MIC2

RMS

)

50

12

10
8

6

4
2
0

) (%)

L

D(V

7092-04.EPS

6/24

TEA7092

TRANSMIT CHARACTERISTICS (continued)
Maximum Level on Line in Tx (see Figure 3)

The minimumoperating voltage of the TEA7092is 2.5V. At low line currentvalue, when the voltageover
the TEA7092is low, thesoftclippingfunctionautomaticallylimitsthe AC dynamicto avoidto reach the 2.5V
limit on the TEA7092.

When the DCvoltageover the TEA7092is high enough, the AC dynamicis limitedat a valuefixed by the
external resistor RSOFTconnectedon PinSOFTL.
The Valueof RSOFT is performed by : RSOFT= (RS x 50E

-6

- 0.8- VacPeak)/ 40E

-6

Tx Characteristics (T

=25°C,f = 1kHz,seeTest 3)

amb

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Gtl

Transmit gain in Handset Mode V

Gtsm

Transmit gain in Handsfree Mode V

Ghl

Ghfm

Gt-6dB Transmit Gain

(-6dB intransmit path)

Zmic

Zhf

Ntx
Nhf

Handset Mic Input Impedance
Handsfree MicInput Impedance

Transmit Noise in Handset Mode
Transmit Noise in Handsfree Mode

Mmic Microphone Mute V

V

Lpeak

Transmit SoftclippingLevel See Figure 2, Vem= -42dBV, IL= 20mA 1.0 1.4 1.8 Vpeak

Transmit Distortion I
Dtx1
Dtx2

Squelch on Transmit Channel (T

amb

=25°C,f = 1kHz, IL=20mA, seeTest3)

= -48dBV

em

= 20mA

I

L

= 90mA

I

L

= -28dBV, Code 0110010

hfin

= 20mA

I

L

= 90mA

I

L

= -48dBV, IL= 20mA

V

em

Code 0110110
Between Pins MIC1, MIC2

Between HFIN and V

= 20mA, Code 0110010

I

L

2kΩ between MIC1 & MIC2
2kΩ between HFIN & V

= -48dBV, IL= 20mA 60 dB

em

= 20mA, see Figure 2

L

= -48dBV

V

em

= -36dBV

V

em

REF

REF

443745394641dB

241725192621dB

567dB

301540205025kΩ

-75

-75

dB

dB

kΩ

dBmp
dBmp

1

%

5

%

The principle of the squelch is to reduce the transmitgain as soon as the amplitude of the signal on the
microphoneis lower than a fixed thresholdvoltage, VT2.

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Gtlmax

Gtlmax-Gsq

Transmit Gain V

em1

V

em2

= -75dBV
= -65dBV

36
45

Gsq Gain Variation See Figure 4 / 9 dB

dB
dB

Figure 3 : Line PeakVoltage versus DC Line

Current

10

V

AC Pe a k

(V)

L

V

8

6

4

2

2.5V Min. Line Pea k Voltage

V

20 40 60 80 1000

DC Mask

AC Peak

IL(mA)

Figure4 : TransmitGain versus Microphone

AC Input Signal

Trans mit
Gain (dB)

Gtlmax

Gtlmax - Gsq

7092-05.EPS

V

em1

Dgt

V

T1

V

T2

Microphone AC Voltage

V

em2

Gst

V

(dBV)

7/24

em

7092-06.EPS

TEA7092

RECEIVECHARACTERISTICS (T

=25°C,f = 1kHz)

amb

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Eff Sidetone Efficiency Test 3, V

Gain

Test 2

Grl

Grs

Grs+6

+6dB Code [0010110]

Distortion Test 2, I
Drx1
Drx2

Nrx Noise Test 2, I

Mrx Mute Test 2, I

Z

Z

OUT

Input Impedance Between Pins SNSL & SNLL 120 150 kΩ

IN

Output Impedance 5 Ω

I
I
I

V
V

= -48dBV, IL= 20mA 26 dB

em

= 20mA

L

= 90mA

L

= 90mA

L

= 20mA

L

= -3dBV

ear

= 0dBV

ear

= 20mA -76 dBmp

L

= 20mA, VL= -9dBV 60 dB

L

5

-1.2
5

6

0.8
6

7

2.8
7

3
5

dB
dB
dB

%
%

The sidetoneof theTEA7092usestwo networks,these twonetworksareinternallymixedbetweenlongline
lengthand short line length.

The following equation givesthe sidetone impedanceversus linecurrent: ZAL = K x ZALL+ (1 - K)x ZASL
K=1forI

=ILL ;K= 0 forIL=ISL,and K varieslinear l ybetween1 and0 when ILvari esbetweenILL and ISL.

L

It is possibleto use only the standardone sidetone conceptby short-circuitedPins SNSL ans SNLL.

Gain Control Inhibition FacilityFor PABXApplication

(T

=25°C,IL=20mA, f = 1kHz / NoAGC mode selected 0010100)

amb

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Gtp Transmit Gain Test 2 Gtl - 3 Gtl- 2 Gtl -1 dB
Grp Receive Gain Test 3 Grl- 3 Grl - 1.4 Grl - 0.5 dB

LOUDSPEAKERAMPLIFIER PART
LoudspeakerAmplifier Channel (T

=25°C,f = 1kHz, RLS=50Ω, Vem=0)

amb

The Loudspeakeramplifier channelhas a maximumgain of 35dBbetween Pin LSIN and Pin LSOUT. This
gain is programmablethrough the serialbus interface, 7 stepsof 4dB each.
To avoid distortion, the output level on the loudspeaker is controlled by a softclippingfunction, the time
constant of thisfeature is connectedto LSSOF pin.

Symbol Parameter Test Conditions Min. Typ. Max. Unit

GAIN VHP/Vac Test 4 IL = 20mA
GLS0 GMAX Code: (0 1 0 0 1 1 1) 33.5 35 36.5 dB
GLS1 GMAX-4dB Code: (01 0 0 1 1 0) 29.5 31 32.5 dB
GLS2 GMAX-8dB Code: (01 0 0 1 0 1) 25.5 27 28.5 dB
GLS3 GMAX-12dB Code: (01 0 0 1 0 0) 21.5 23 24.5 dB
GLS4 GMAX-16dB Code: (01 0 0 0 1 1) 17.5 19 20.5 dB
GLS5 GMAX-20db Code: (0 1 0 0 0 1 0) 13.5 15 16.5 dB
GLS6 GMAX-24dB Code: (01 0 0 0 0 1) 9.5 11 12.5 dB
GLS7 GMAX-28dB Code: (01 0 0 0 0 0) 5.5 7 8.5 dB

Mls Mute Loudspeaker Test 4 -30 dB
lsin Input Impedance 30 40 50 kΩ

PLS1
PLS2

Output Power Test 4, Gain= GLS0, V

IL= 20mA, D ≤ 2%

= 90mA, D ≤ 2%

I

L

= 0.15V

IN

RMS

13
40

18
55

mW
mW

8/24

TEA7092

LOUDSPEAKERAMPLIFIERPART(continued)
AntiacousticFeedback (T

The antiacoustic feedback system is coupled to the microphone squelch. As soon as the level on the handset
microphoneis higherthanVT2,thetrans m it gainincreasesand theloudspeakergaindecre as es.Sothetrans mi t
andloudspeak ergai nsareneversim ultane ouslyat maximum gain,whichreduceslarseneffec t.

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Dgls(0)

Antiacoustic Feedback Efficiency Code 0111100
Dgls(1)
Dgls(2)
Dgls(3)

Figure5 : LoudspeakerGain GLSversus Voltage on Microphone

=25°C, IL=20mA, see Test4)

amb

Code 0111101
Code 0111110
Code 0111111

-12

-17

-21.5

-26.5

-9.5

-14.5

-18.5

-22.5

-7

-12

-15.5

-18.5

dB
dB
dB
dB

Gtr (dB)

Gma x

Gma x - 9dB

GLS

GLS - xdB

Low Microphone

Level

3dB

VT1V

Normal Speech

9dB

T2

GLS is Programmable through the Volum e Control S ta g e

x is Programmable through the S e rialBus
(10, 15, 20, 25dB) (defaultvalue is 15dB)

High Microphone Signal
Softclipping Mode

V

SOFT

V

MIC

V

MIC

RING MODE
LoudspeakerPower Supply in Ring Mode (T

=25°C,RLS=50Ω, seeTest 5)

amb

In ring mode, it is neccessaryto convert thehigh voltage / lowcurrent power input to a low voltage / high
currentpower,outputto be able to drivea 50Ω loudspeaker,the externalswitchmode powersupply driven
by the TEA7092realizes thisfeature.
The switch mode powersupply, through externalcomponent values,fixes the impedance and the start up
thresholdlevel.
The volumecontrolinring modeisthe samethan the one usedin loudspeakingmodefor thehigheststeps,
8 stepsof 4dB, and5 morestepsof 4dBeach have beenadded,by using the code 0111011,for the lowest
one, by this way the maximum depth in ring modefor the volume control is 48dB.

Symbol Parameter Test Conditions Min. Typ. Max. Unit

40

I

LEAK1

I

LEAK2

I

RON1

I

VRSU

V

V

RMC1

V

V

RES1

V

V

RMC2

V

V

RES2

V

LS1

RI1

LS2

RI2

OUT

Leackage Current V

= 16V, I(VZP) = 0

RING

V

RING=VRSU

= 22V, I(VZP) = 20µA

130
Input Current
Start up Current 60 150 µA
LS Supply 2.8 3.05 3.5 V
Stabilized Microprocessor Supply 2.75 3 V

V

= 22V

RING

I(VZP) = 140µA, I(VLS) = 40mA
No codesent, no signal on the
loudspeaker output

Ring Indicator Output 2.7 2.95 V
Reset Output 2.7 2.95 V
LS Supply
Stabilized Microprocessor Supply 3 3.4 3.75 V
Ring Indicator Output 2.9 3.3 V
Reset Output 2.9 3.3 V
LS Output Level 5 5.4 V

= 22V, I(VZP) =250µA,

V

RING

Gain = Gain Max.,
Codes sent :

- Grouplistening

- FI = 26321Hz & n = 60

- Ring start

5 5.4 V

150
400µAµA

10 12 mA

PP

7092-07.EPS

Ring Frequency

The frequenciesof the ringare givenby :Fring =

Fi

.

n
Fi cantake one of thefollowing values: 19455Hz,21308Hz, 23551Hzor 26321Hz,and n varies between
1 and 63. Fi and n correspondto 2 codes sent on the serialbus.

9/24

TEA7092

DTMF GENERATOR (T

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Amf Tone Frequency Accuracy f = 3.58MHz, I

Llf Low Frequency GroupLine Level I
LhF Hifh Frequency Group Line Level I
Pmf Preemphasis HF/LF I

t

t

Velf

Vehf

Vllf

Vlhf

Rise Time IL= 20mA & 90mA 5 ms

R

Decay Time IL= 20mA & 90mA 5 ms

diff

Confidence Tone Level :

- Earphone Level (Low Frequency)

- Earphone Level (High Frequency)

- Loudspeaker Level (Low Frequency)

- Loudspeaker Level (High Frequency)

=25°C,see Test 3)

amb

= 90mA -0.4 0.4 %

L

= 20mA & 90mA -9.5 -8 -6.5 dBm

L

= 20mA & 90mA -7.5 -6 -4.5 dBm

L

= 20mA & 90mA 1 2 3 dB

L

= 20mA & 90mA

I

L

Code Level (0100111)

-35

-33

-10

-8

-32

-30

-7

-5

-29

-27

-4

-2

dBm
dBm
dBm
dBm

Unwantedfrequenciescomply with CEPT46-03.

SINE WAVE GENERATOR (T

=25°C,IL=20 & 90mA, see Test 3)

amb

The sine wave generator uses the same path than theDTMF generator.Sinus wave frequenciesare the
half of the DTMF frequencies.

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Sfl Line Level Low Frequency Group 348 / 385 / 426 / 470Hz -18 -14 -10 dBm

Sfh LineLevel High Frequency Group 604 / 668 / 738 / 816 Hz -16 -12 -8 dBm

ERROR BEEP GENERATOR

Fi

=

The frequenciesof the error beep generatorare given by: F

EB

.

n

Fi can takeone thefollowing values : 19455Hz, 21308Hz, 23551Hz or 26321Hz,and nvariesbetween 1
and 63.

Error beepgeneratorcode generates square wavesignal in the earphone.
Error beep generator code followingby group listening code generatesquare wave signalin theearphone

and inthe loudspeaker.

10/24

MICROCONTROLLER INTERFACE
MicrocontrollerPower Supply

The microcontroller power supply consists in a
serial regulator which generatesa 3.5V regulated
supply on V
applied on V

The V

Pin can be supplied either by the line, a

MC

battery or any DC generator.The use of V
allows to regulate the output V

Pin, from an unregulated voltage

RMC

or VLSPin.

MC

voltage for an

RMC

MC

input

LCD display. With no load,the quiescentcurrent,
is 60µA. Foran outputcurrent of 1.8mA,the typical
drop voltage between V

MC

and V

RMC

Pins is

150mV.

MicrocontrollerControl Signals
RESET : This output is setting to “1”when V

RMC

reachesthe 2.6V threshold level.This outputgoes
back to ”0” :

-IfV

goesbelow 2.5Vor

RMC

- If the Reset code (0010111) is sent on theserial
bus interface and if PONoutput is at level ”0”.
Whenthe Reset code hasbeen previouslysent,
Pin RESETgoes back toan high level,if V

RMC

is

Figure 6 : MicroprocessorPower Supply Block Diagram

TEA7092

higher thantherise threshold, onlyon ariseedge
of PON signal. If this PON rise edge does not
appear,the RESETPinremains at low logic level
even if V

WhenPONoutput isat level”1”, the Resetcode is
inhibited.

PON : This output goes high when V
the 2.6Vthreshold level and the line currentvalue
is upper than 12mA. As soon as theReset output
is atlevel ”1”, the4mAline currentthresholddetec­tor can be sent through the serial bus interface
(0111001) to check if the line current value is be­tween 4 and 12mA.

RI/VI :

- In Ringmode : This output goes to level ”1” if :

• Pin RSU > 19V

• Pin V

- In Off-Hookmode : This output manages the line
current variation indicator for transfer function
and thisinformationis usedbythemicrocontroller
to managethe transfer from one telephonesetto
an other one connected in parallel on the same
line.

goes upper 2.6V.

RMC

> 2.6V

RMC

RMC

reaches

3

V

L

3mA I

>1M

Ω

Switch Closed if:
V
V

> 2.5V or

RMC

>20V

RSU

LS

V

LS

1

+

Ring Information

C1

11

12

8

RESET

PON

V

RMC

+

> 12m A(01110 00) or

I

L

> 4mA(0111001)

I

L

2.5V

C8

135k

Ω

2

V
+

MC

1.2V
90k

Ω

C2

7092-08.EPS

11/24

TEA7092

MICROCONTROLLER INTERFACE (continued)
Reset and Power On
Figure 7 : TelephoneSet Poweredfrom the Line,IL>I

Without Using the RESET Code Through the Se rial Bus Interface

AABCD DE

IL

I

REF1

VMC

5

2.7

REF1

, without Batteries

t

V

RMC

3.5

2.6

PON

RESE T

Us ing the RES ET Code Through the Serial Bus Interfa ce

IL

AB CD DEDFA

I

REF1

VMC

5

2.7

V

RMC

3.5

2.6

t

t

t

t

t

t

PON

RESE T

A: ON-HOOK
B : START UP + S PEEC H
C:PULSEDIALING
D : SP EECH or DTMF
E : LINE BREAKEXCHANGE DURATION
F : LINE BREAKEXCHANGE DURATION> td
td : DELAYFIXED BY THE MICROCONTROLLER

12/24

tdtd

Re set code (0010111) sent by

the microcontroller.

t

t

t

7092-09.EPS

TEA7092

MICROCONTROLLER INTERFACE (continued)
MicrocontrollerStabilizedSupply (T

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

RMC1

V

RMC2

Ivmcq1
Ivmcq2

Ivmcq3

Output Voltage I(V

Quiescent Current
I(V

MC

) - I(V

RMC

)

=25°C, IL= 0mA)

amb

RMC

I(V

RMC

V

MC=VRMC

Oscillator ON, I(V
Code 0111010 I(V

) = -1.8mA, VMC= 4V, VLS=0V
) = 0, VMC= 0V, VLS=4V

+ 0.3V

)=0

RMC

) = -1.8mA

RMC

)=0

I(V

RMC

3.2

3.2

3.5

3.5

250

95
50

3.75

3.75VV

400
200

120

µA
µA

µA

RESET (T

=25°C,IL=0mA)

amb

Symbol Parameter TestConditions Min. Typ. Max. Unit

= 1mA, VMC=4V

I

V

RESL

V

RESH

PON (T

Low Threshold
High Threshold

=25°C)

amb

RESET

V
V

RMC
RMC

= 0.66 x V
= 0.8 x V

RMC1

RMC1

V

RMC

- 0.4

0.4 V

Symbol Parameter TestConditions Min. Typ. Max. Unit

= -1mA

I

V

V

PONH1

V

PONH2

PONL

Low Threshold
High Threshold
High Threshold

RI/VI ,Hold Function (T

amb

=25°C)

PON

Code (0111000), I
Code (0111000), I
Code (0111001), I

= 8mA

L

= 20mA

L

= 8mA

L

V

0.4 V

- 0.4

RMC

- 0.4

V

RMC

Symbol Parameter TestConditions Min. Typ. Max. Unit

V
V

RIVIL
RIVIH

Low Threshold
High Threshold

IL= 90mA, Code (0011010)

= 70mA V

I

L

RMC

- 0.4

0.4 V

V

V
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 differentcodes are :

- The ring start up code

- The ring frequencycontrol code

- The mode codes :

• Handsetmode

• Grouplistening mode

• Handsfreemode

- The operatingcodes (these codes are used un­der each codemode) :

• Speech

• Dialing

• Microphonemute

• Earphone/Microphonemute

• Error beep

• Sine wavehigh frequency

• Sine wavelow frequency

- The data codes (DTMF, sinus wave, ring fre­quency,error beep frequency codes) :
Thesedata codes arestoredinside theTEA7092
and are used as soon as an operating code is
sent,dialing,errorbeep,sinewaveorringmelody
controlor ring start upcode.

- The configuration codes (those codes are ”flip­flop” codes) :

• AGC/noAGC

• No mask / mask

Figure 8 : 7 Bit Codes Dataand Clock Input Timing

• Normal gain/normal gain +6dB, on receive
channel

• Twosidetone network/one sidetone network

• Squelch/Nosquelch

• Line current variation initialization (No trans-

fer/Transfer)

• Minus 21dB in Ring Mode

• Minus 6dB in SendingMode

• OscillatorStand-by

For instance: The first time that the +6dB codeis
sent,thereceivegainincreasesof+6dB.Ifitissent
again,the receive gain goesbackto normalvalue.

- Theloudspeakerlevel control codes

- Theresetcodeto inializetheTEA7092andto set
the resetoutput to ”0” lowlogic level

- TheInit code to initializethe TEA7092, software
initialization to set the TEA7092 in the start up
condition.

- Thestart up condition of the TEA7092is :

• Handsetmode.

• Speech.

• No mask.

• AGC in transmitand receivechannels.

• Normalgain on receivechannel.

• Squelchon transmit channel.

• Twosidetone networks.

• No transfer.

• OscillatorON.

• PON line threshold current: 12mA.

• Anti-acousticfeed-backattenuation: 15dB.

Ik Data

14/24

Datas will change during Clk = 1

t1 t2t3 t4 t5

ata

Synchro

a0 a1 a2 a3 a4 a5 a6

t1 = t2 = t4 = t5 = 1µs
t3 = 2µs

7092-10.EPS

MICROCONTROLLER INTERFACE (continued)
Note : In the tablesin thefollowingpages, the default codes are in Bold.

The Mode Codes

Codes

a6 a5 a4 a3 a2 a1 a0

0

0
0

1

1
1

1

1
1

0

0
0

0

0
0

0

0
1

0

Handset Mode

1

Group Listening Mode

0

Handsfree Mode

The OperatingCodes Related to Mode Codes

Codes

a6 a5 a4 a3 a2 a1 a0

0

0
0
0
0
0
0

0

0
0
0
0
0
0

1

1
1
1
1
1
1

0

0
0
0
1
1
1

0

0
0
0
1
1
1

0

0
1
1
0
0
1

0

Speech

1

Dialing

0

Mute Tx & Rx

1

Mute Tx

0

Error Beep

1

Sine Wave High Frequencies

0

Sine Wave Low Frequencies

The ConfigurationCodes (toggle codes)

Codes

a6 a5 a4 a3 a2 a1 a0

0
0
0
0
0
0
0

0
0
0
0
0
0
0

1
1
1
1
1
1
1

0
0
0
1
1
1
1

1
1
1
0
0
0
0

0
0
1
0
0
1
1

0

AGC / no AGC

1

No Mask / Mask

0

Normal Receive Gain / +6dB

0

Two Sidetones / Fixed Up (3/4 x ZALL +1/4 x ZASL)

1

Squelch / No Squelch

0

No Transfer / Transfer Request

1

Two Sidetones / One Sidetone (ZASL)

TEA7092

Remarks

Remarks

Remarks

The OtherCodes

Codes

a6 a5 a4 a3 a2 a1 a0

0
0
0

0

0
0

0

0
0
0
0
0
0

0
0
1

1

1
1

1

1
1
1
1
1
1

1
1
0

1

1
1

1

1
1
1
1
1
1

0
0
1

1

1
1

1

1
1
0
1
1
0

0
1
0

0

0
1

1

1
1
1
0
0
0

0
1
0

0

0
0

0

1
1
1
1
1
1

1

Ring Start

1

Reset Control

0

Initialization Code

0

Line Threshold Current 12mA

1

Line Threshold Current 4mA

0

Dgls(1) 10dB

1

Dgls(2) 15dB

0

Dgls(3) 20dB

1

Dgls(4) 25dB

0

Transmit Gain -6dB

1

-21dB Attenuation in Ring Mode

0

Oscillator Stand-by

1

Ring Melody Control

Remarks

15/24

TEA7092

MICROCONTROLLER INTERFACE (continued)
HFIN Input Selection

For answeringmachine or cordless connectionit canbe requested to select HFIN input without enabling
the loudspeaker.For this the followingprocedureshould be sent :

- Handsfreecode 0110010.

- Tx& Rx mutes0010010.

- HFINinput select 0110111.
To go backto handsfreemode, send :

- Speechcode 0010000.
To go backto handsetmode, send :

- Speechcode 0010000.

- Handsetcode 0110000.

The LoudspeakerControl Code

Codes

a6 a5 a4 a3 a2 a1 a0

0
0
0
0
0
0
0
0

1
1
1
1
1
1
1
1

0
0
0
0
0
0
0
0

0
0
0
0
0
0
0
0

0
0
0
0
1
1
1
1

0
0
1
1
0
0
1
1

0

Gmax -28dB

1

Gmax -24dB

0

Gmax -20dB

1

Gmax -16dB Loudspeaker

0

Gmax -12dB Level Control

1

Gmax -8dB

0

Gmax -4dB

1

Gmax

Remarks

The DataCodes

These codes are used inthree differentways, dependingof the operatingcode sent after the data codes:

- In DTMFdialing : Data code+Dialingcode

- In Single sine wave : Data code+Sinewave high frequencies(or Sinewave 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 DTMF Dialing Mode

a6 a5 a4 a3 a2 a1 a0 Key DTMF Frequencies

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

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

0

1

0

1

1

0

1

0

1

1

1

1

0

0

0

0

0

1

0

1

1

0

1

0

1

1

1

1

“2”

1

“1”

0

“A”

1

“3”

0

“8”

1

“7”

0

“C”

1

“9”

0

“5”

1

“4”

0

“B”

1

“6”

0

“0”

1

“*”

0

“D”

1

“#”

1336Hz + 697Hz
1209Hz + 697Hz
1633Hz + 697Hz
1477Hz + 697Hz
1336Hz + 852Hz
1209Hz + 852Hz
1633Hz + 852Hz
1477Hz + 852Hz
1336Hz + 770Hz
1209Hz + 770Hz
1633Hz + 770Hz
1477Hz + 770Hz
1336Hz + 941Hz
1209Hz + 941Hz
1633Hz + 941Hz
1477Hz + 941Hz

Sine Wave Generator Fi

348 or 604Hz

426 or 738Hz
385 or 668Hz

470 or 816Hz

19455Hz

23551Hz
21308Hz

26321Hz

16/24

TEA7092

MICROCONTROLLER INTERFACE (continued)
ProgrammableDivider for Ring Frequencies

Ring Frequencies Ring Frequencies

Fi codes (Hz) / * Notes (Hz) 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

If requested,the high frequenciescorresponding to n varied between 1 to 15 or Dividercodes 100XXXX
are accessible.

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

000XX10

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

23551

000XX11

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

21308

000XX00

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

19455

000XX01

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

Divider

Codes

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

26321

000XX10

* 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

23551

000XX11

* 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

21308

000XX00

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

19455

000XX01

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

OperatingModes

TheTEA7092can workin 1 of the 3 modes:

- Handset,

- Grouplistening,

- Handsfree.
In each mode the operatingcodes determine the

operationsheld by thecircuit as soonas this code
is received:
For instance DTMF dialing begins as soon as the
dialingcode is received.

The configurationcodes operate in each modeof
operation: forinstanceif the No AGCcode issent,
the AGCinhibitionwill work in the 3 modes: Hand­set, Grouplistening and Handsfree.

DTMF Dialing

To dialin DTMF thefollowi ngcodesequenceis sent :

- DTMF: 000XXXX.

- Dialingcode : 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
SPEECHcode

Note : DTMF code automatically mutes the microphone.

Sine Wave Codes

To generate a melody the following sequence of
codes is sent :

- Frequencycode : 000XXXX.

- SINE WAVE code : 0011101or 0011110(low or
high frequency).

- SPE ECHcode:0010000(toendSINEWAVEmode).

The duration of the melody is being set by the
durationbetween SINEWAVE codeand SPEECH
code.

Note : SINE WAVE code automatically mutes the microphone.

PULSEDialing

The pulse dialing function is performed by the
microcontrollerthrough the highvoltage stage.

The voltage over the TEA7092during dialing can
be reducedby sendingthe MASK code 0010101.

Torecover the normalspeechvoltageat the end of
dialingthe maskcode mustbe sentagain.

17/24

TEA7092

MICROCONTROLLER INTERFACE (continued)
RING Mode

- Ringfrequencygenerator:
In ring mode, to generatethe ring melody in the
loudspeaker,the followingsequence is sent :

• LOUDSPEAKERLEVEL: 0100XXX.

• Fi DATA : 000XXXX.

• DIVIDERDATA : 1XXXXXX.

• GROUPLISTENINGCODE : 0110001.

• RING START : 0010001.

• SPEECH : 0010000 (To stop the ring mode

when off-hookis detected,PON = 1).

To change the ring frequency only Fi data and
dividerdata are sent again.

- Ringindicatorinput (RI/VI) :
In ring mode theTEA7092generatesa high logic
level on pin RI/VI, as soon as the voltage on pin
RSU is higher than 19V, and the voltage on pin

is higher than 2.6V. When the voltage on

V

RMC

pin V
goes high.

Ring Melody Control

The melodycan be checkedinoff-hookby sending
the followingsequenceof codes :

- LOUDSPEAKERLEVEL : 0100XXX.

- Fi data : 000XXXX.

- DIVIDERdata : 1XXXXXX.

- RINGMELODYCONTROL : 0110011.

To change the melody or the level, only loud­speakerlevel,Fidataand ndivider data haveto be
sent. To stop the ring melody, a speech code
0010000 issent.

Figure 9 : TimeDiagram of Transfer Request

is higher than 2.6V,the RESEToutput

RMC

ErrorBeep

Errorbeepcouldbe usedto signalizewrong opera­tions(memoryempty,re-dialempty,storetoomany
digits in a memory...) or for other procedures,like
melody.To generate the error beep, the following
sequenceof codesis sent :

- Fi data: 000XXXX.

- DIVIDER data : 1XXXXXX.

- ERRORBEEP code : 0011100.
To stop the error beep a speech code 0010000is

sent. The errorbeep is a square wave sent onthe
earphone, if it is requested to send it also in the
loudspeaker,the Group listeningcode shouldalso
be sent.

Line Current VariationDetection

The TEA7092 has a line currentvariation detector.
This feature memorizes the line current value.
Whenthe transferrequestcodeis sent,and if a the
current inside the TEA7092decreases of 15% or
more of theline currentvalue, due for exampleto
a telephoneset off-hookedin parallel on the same
line, the output RI/VI goes HIGH to prevent the
associated microcontroller. Oscillator should be
ON, and it is preferableto 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 memorizationis disabled.

RI/VI

RI/VI

18/24

Transfert Request

t0

Line CurrentMemorizationActivated

Flip-Flop Operating

t0

Line CurrentMemorizationActivated

µPSend theCode (0011010)

µPSend theCode (0011010)

LineCurrentMemorizationCancelled

LineCurrent Variation
(if> 15%of IL)

7092-11.EPS

TEA7092

COMPONENT LIST

Reference Part Reference Part Reference Part Reference Part

DC Mask CLL, CSL 33pF Rring 47Ω C26 100µF/16V

RS 82kΩ Resistors RLS 50Ω C27 150nF

RSLP 2.2kΩ R1 220kΩ Rear 300Ω C30 1µF

Return Loss R3 30Ω Capacitors C38 22nF

RZ 620Ω R4 3kΩ C1 68µF/16V C41 470pF

Tx Path R5 3kΩ C2 470µF/6V C44 47µF/6V

RGT 1540Ω R6 220kΩ C3 10µF/63V Others

RSOFT 51kΩ R7 100kΩ C4 47nF D1,D2,D3, D4 1N4004

Rx path R8 1.5MΩ C5 47nF DS1 BYW10-60
RGR1 39kΩ R9 1.5MΩ C6 470nF DS2 BAT43
RGR2 39kΩ R10 10kΩ C7 1nF Z1 BZX55C 47V

DTMF Path R11 12kΩ C8 10µF/6V Z2 BZX55C8.2V

CDT 47nF/1% R17 220kΩ C9 47nF Z3 BZX55C 12V

CDT2 3.3nF R23 2kΩ C15 220nF Q1 BC556B

A.G.C. R25 2kΩ C16 220nF Q2 BC546B

RLL 15kΩ R27 910kΩ C17 470nF Q4 BF393

RSL 4.7kΩ R29 30kΩ C18 1µF M1 BSS 92

Sidetone Networks R39 1.5kΩ C22 47nF L1 1mH
RLL1, RSL1 0 R40 47kΩ C24 47nF
RLL2, RSL2 30kΩ R41 30kΩ C25 47nF Quartz 3.58MHz (Ri < 100Ω)

(R < 4Ω/Imax = 400mA)

7092-05.TBL

19/24

TEA7092

Test 1

C

L

I

L

R

L

RZ

RLL2

ZALL

R4

V

L

R3

R5

CLL

RSL2

CSL

ZASL

C16 C1 5

19

3

RS

V

L

RECIN

30

V

S

26

V

CC

22

HFIN

40

RSU

39

SWP

38

VZP
SOFTL

28

AGND

GND

32 33 3435 3637

43 42 41

SNLL

SNSL

REF

REF

SLP

MIC1

V

I

31

29

MIC2

TSOFT

GTR

7 89

23 2425

21

27

To Pin
V

TEA7092

DTMF1

DTMF2

I

I

PON

RESET

Logic

Con tro l

SW2

PON

SW3

1112 13141516

RESET

CC

DATA

CLK

I

RI

V

RI/VI

10

LSOUT

RI/VI

LSSOF

C44

44

R6

6

RLS

C6

5

GREC

EAR+

EAR-

ILL

ISL

RCO

OSC

VMCV

2

LSIN

REOUT

ASC

ASQ

V

REFL

V

RMC

C5

R17

C17

C9

C4

20

C18

18

17

4

1

LS

C26

Test 2

I

L

RZ

C30

C25

R29

RSLP

RSOFT

IL+i

AC

C

L

V

AC

V

R3

R4

L

R5

C16 C1 5

RS

3

V

L

RECIN

30

V

S

26

V

CC

22

HFIN

C22

40

RSU

39

SWP

38

VZP
SOFTL

28

AGND

GND

32 33 3435 3637

43 42 41

SNLL

REF

REF

V

SLP

I

29

31

151619

R23

SNSL

R27

C24

RLL2

CLL

RSL2

CSL

C27

RGT

ZALL

ZASL

CDT1

CDT2

To P in
V

CC

RGR2

RGR1

Logic

Con tr o l

PON

RLL

REAR

7 BitSeria l Cod e

DATA

RESET

RSL

3.58MHz
I

V

VMC

Grl = 20 log a t ILL, Grs = 20 log at ILm

Mea r = 20 log

10 0kHz

CLK

Rlos s =20 log

101112 1 314

RI/VI

V

RMC

MC

+

+

V

ear

V

L

VL(0010 000)
V

Z+600

Z - 600

LSOUT

LSSOF

I

VRMC

(0010 010)

L

44

6

V

LS

+

I

VLS

7092-12.EPS

V

ear

V

L

V

AC

Z=

I

AC

C44

R6

V

HP

RLS

C6

5

LSIN

20

OSC

VMCV

2

REOUT

ASC

ASQ

V

RMC

REFL

V

18

17

4

1

LS

TEA7092

MIC1

MIC2

TSOFT

GTR

DTMF1

23 2425

21

27

DTMF2

7 89

GREC

EAR+

EAR-

ILL

ISL

RCO

R17

C5

C18

C17

C9

C4

C1

20/24

C26

C30

R25

RSOFT

C25

R29

RSLP

R23

R27

C24

C27

RGT

CDT1

CDT2

RGR2

RGR1

REAR

V

EAR

RLL

RSL

3.58MHz
C8C2

7092-13.EPS

Test 3

I

L

RZ

C26

C30

TEA7092

V

= 0Vat 20mA, Vem=0V

IL+i

AC

C

L

L

R

V

R3

R4

L

R5

C16 C1 5

R25

RS

3

V

L

RECIN

30

V

S

26

V

CC

22

HFIN

C22

40

RSU

39

SWP

V

hfin

38

VZP
SOFTL

28

REF

AGND

GND

V

43 42 41

32 33 3435 3637

RSOFT

29

R29

151619

SNLL

REF

SLP

MIC1

I

31

23 2425

RSLP

C25

SNSL

R23

MIC2

V

R27

em

C24

CLL

RSL2

CSL

27

RLL2

ZALL

ZASL

To P in
V

Logic

Con tr o l

CC

PON

TEA7092

TSOFT

GTR

DTMF1

21

RGT

DTMF2

7 89

CDT1

CDT2

C27

RGR2

GREC

RGR1

EAR+

RESET

EAR-

REAR

V

7 Bit Se rialC ode

100kHz

DATA

ILL

EAR

RLL

RSL

hfin

Grl = 20 log at ILL

Gts m = 20 log at 9 0 mA

Mmic= 20 log

Eff = 20 log

101112 1314

CLK

RI/VI

ISL

RCO

OSC

3.58MHz

VMCV

2

V

L

V

em

V

L

V

em

VL(001000 0)
V

(001001 1)

L

V

ear

,

V

em

LSOUT

LSSOF

LSIN

REOUT

ASC

ASQ

V

REFL

V

LS

RMC

C8C2

Ghfm = 20 log

C44

44

R6

6

C6

5

C5

20

18

R17

17

4

1

C18

C17

V

L

V

hfin

V

RLS

HP

C9

C4

C1

Test 4

I

L

RZ

C26

RLL2

ZALL

RLL1

V

L

R3

RSL1

CLL

RSL2

CSL

ZASL

C16 C15

3

RS

V

L

30

26

22

40
39

38

28

C30

RECIN

V

S

V

CC

HFIN
RSU
SWP
VZP

SOFTL

REF

AGND

GND

V

32 33 3435 3637

43 42 41

RSOFT

29

R29

C25

151619

SNLL

SNSL

REF

SLP

MIC1

I

31

RSLP

MIC2

TSOFT

GTR

23 2425

R23

R27

21

27

C24

V

RGT

em

C27

7 Bit S e rial Code

Logic

PON

(011001/01000 00)

1112 1314

RESET

DATA

100kHz

CLK

To P in
V

CC

Co ntro l

TEA7092

DTMF1

DTMF2

7 89

CDT1

CDT2

RGR2

GREC

RGR1

EAR+

REAR

EAR-

ILL

ISL

V

EAR

RLL

RSL

Gls = 20 log

Dgls = 20 log

MuteLS = 2 0 log

10

RI/VI

RCO

OSC

3.58MHz

V

HP

V

AC

VHP(Vem= -75d BV)
VHP(Vem= -65d BV)

LSOUT

LSSOF

LSIN

REOUT

ASC

ASQ

V

REFL

V

RMC

VMCV

2

2

V

HP

Pls =

RLS

V

(cod e 0100111)

HP

VHP(cod e 0110000)

C44

44

R6

6

C6

5

C5

20

C18

18

R17

17

C17

4

1

LS

C1

C8C2

7092-14.EPS

V

RLS

HP

V

AC

C9

C4

21/24

7092-15.EPS

TEA7092

Test 5

Logic

Con tr ol

3

R

RING

30

V

R1

R11R39

C3

Q1

Q2

Z2

SWP

V

V

RING

+

I

RING

V

RS U

+

I

RS U

)

ZP

I(V

S

26

V

CC

22

HFIN

40

RSU

39

SWP

38

VZP

28

SOFTL

ZP

V

32

AGND

C38

L1

)

LS

DS1

LS

V

I(V

19

V

L

SNLL

SNSL

RECIN

TEA7092

REF

REF

GND

43 42 41

SLP

MIC1

V

I

29

MIC2

TSOFT

23 2425

31

21

27

7 Bit Serial Co de

100kHz

1112 13141516

PON

GTR

DATA

RESET

DTMF1

DTMF2

GREC

79

EAR+

CLK

EAR-

IRI

VRI

10

RI/VI

LSOUT

LSSOF

REOUT

ILL

ISL

RCO

OSC

33 3435 3637

VMCV

28

LSIN

RMC

ASC
ASQ
V

REFL

C44

44

R6

6

C6

5

20

18

17

C4

4

1

V

LS

C1

C8

R41

C41

V

RCO

3.58MHz

RLS

V

HP

7092-16.EPS

22/24

TYPICALAPPLICATION

TEA7092

DS2

R8R10

Z3

MICROCONTROLLER

ZALC

RSL2

To Pin

RSL1

CSL

R5

R3

KEYBOARD

ZALL

RLL1

RLL2

CLL

R4

R7 R9

Q4

181920

ASC

R17

C4

C17

17

ASQ

Loud-

speaker

C18

C5

C6

R6

C44

5

6

44

LSIN

LSSOF

LSOUT

RI/VI

101112 13141516

CLK

REOUT

DATA

RESET

PON

C1

1

4

LS

V

REFL

V

RMC

V

MC

V

2

OSC

RCO
ISL

ILL

C2 C8

3.58MHz

RSL

RLL

C41

R41

Earphone

EAR­EAR+

CC

V

GREC

RGR1

RGR2

CDT2

DTMF2

C16 C15

TEA7092

SNSL

SNLL

RECIN

L

3

V

VCCVS

26

30

HFIN

22

RSU

40

SWP

39

VZP

38

REF

REF

SOFTL

28

DTMF1

GTR
TSOFT
MIC2

MIC1
SLP

I

V
GND
AGND

7 89

21

27

23 2425

31

29

CDT1

RGT

C27

R27

Microphone

RSLP

R29

C25

43 42 41

32 33 3435 3637

RSOFT

Z4

Hookswitch

D1 D2

2.2kΩ
FM1

1

+ LINE+ RING

R38

RS

R40

C38

RZ

C30

D3 D4

Q1

R11R39

Q2

LINE

R1

C26

C3

DS1

L1

Z2

Z1

7092-17.EPS

23/24

TEA7092

PACKAGE MECHANICALDATA

44 PINS- PLASTICQUADFLAT PACK(THIN)

D

D1

2333

34

A

A2

A1

22

0.10mm
.004

SeatingPlane

B

C

Dimensions

B

44

1

e

11

TQFP44

E3D3E1

12

E

L1

L

K

Millimeters Inches

Min. Typ. Max. Min. Typ. Max.

A 1.60 0.063
A1 0.05 0.15 0.002 0.006
A2 1.35 1.40 1.45 0.053 0.055 0.057

B 0.30 0.35 0.40 0.012 0.014 0.016

C 0.09 0.20 0.004 0.008

D 12.00 0.472
D1 10.00 0.394
D3 8.00 0.315

e 0.80 0.031

E 12.00 0.472
E1 10.00 0.394
E3 8.00 0.315

K0

o

(Min.), 7o(Max.)

L 0.45 0.60 0.75 0.018 0.024 0.030

L1 1.00 0.039

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. Nolicence isgranted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics.
Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all
information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components inlife
support devices or systems without express written approval of SGS-THOMSON Microelectronics.

PMTQFP44.EPS

TQFP44A.TBL

24/24

 1996 SGS-THOMSON Microelectronics - All RightsReserved

Purchase of I2C Components ofSGS-THOMSON Microelectronics, conveys a license under the Philips

2

I

C Patent. Rights to use these components in a I2C system, is granted provided that the system conforms to

2

the I

C Standard Specifications as defined by Philips.

SGS-THOMSON Microelectronics GROUP OF COMPANIES

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