Datasheet TEA7089A Datasheet (SGS Thomson Microelectronics)

LOW-RANGE PHONE DEDICATED CHIP

.

RING

- GENERATION OF 8 MELODYTONES
(Includingthe 3 GermanMelody Tones)

- 4 STEPS DIGITAL CONTROL ON THE AM­PLIFIEROUTPUT LEVEL

.

SPEECH

- TRANSM I TGAINEXTERN ALLYADJUST ABL E

- RECEIV IN GGAINEXTER NALLYADJUSTA B LE

- AGCSLOPEEXTERN A LLYPROGRAMM ABLE

- SOFTCLIPPINGON SENDING CHANNEL

- RECEIVE AMPLIFIER FOR PIEZO OR
ELECTRODYNAMIC TRANSDUCER

- +6dB MODE ON RECEIVECHANNEL

- LINE POWER MANAGEMENT

.

DIALING

- DTMF GENERATOR

- LOW DC MASK DURING MAKE PERIOD
THROUGH MICROCONTROLLER SERIAL
BUS INTERFACE

.

MICROCONTROLLER INTERFACE

- 1.79MHzCLOCKOR3.58MHzOSCILLATOR
INPUT

.

MICROCONTROLLER POWER SUPPLY

.

MICROCONTROLLER CONTROL INTER­FACE INCLUDING SERIALBUS

.

LINE CURRENT EXTRACTOR FOR SUPPLY
OF EXTERNAL PERIPHERALS

(Plastic Package)

ORDER CODE : TEA7089AFP

PIN CONNECTIONS

SOFT

RECIN

SN

AGC

1
2
3
4

TEA7089A

SO28

28
27
26
25

DTMF

V

REF

V

RMC

DCL

DESCRIPTION

The TEA7089A is a Telephone Analog Front End
device, TAFE, which integrates the three basic
functionsof a standardtelephoneset :

- Speechnetwork,

- DTMF generator,

- Ringer generatoron buzzer.
A complete telephone set can be designed using

TEA7089A associated with a low cost microcon­troller.

June 1998

MIC1

MIC2

GTR

V

GND

IVLS

V

V

V

GREC

5
6
7
8

CC

9
10
11

S

12

L

13

MC

14

24
23
22
21
20
19
18
17
16
15

DATA

MSK
OSC
RI

PON

RES

V

RING

BUZ

EAR+

EAR-

7089A-01.EPS

1/17

TEA7089A

SPEECH

Thespeech network includes :

- a lownoisetransmitchannel suitablefor anykind
of microphonetransducer. Softclippingon trans­mit line signal is provided by the chip.

- a low noise receive channel with symmetrical
outputs to be compatiblewith both piezoceramic
and electrodynamicearpiece. An additional 6dB

RINGER

Up to 8 different tones can be generated by the
TEA7089Aringer.The digitalvolume controlof the
ringer can be performed through a specific com­mand(4 steps).A ringindicationsignal is provided
to the microcontroller by the TEA7089A.If more
tones are requested the input RM/MSK allows to

inject tones generatedby the microcontroller.
gain can be inserted in the receive channel
throughsoftware control.

- a linelengthgain control(AGC)withstartingpoint
ofgainregulationfixedat25mAlinecurrent;slope
of gainregulationis externallyadjustablewithone
resistor.AGCcan beremovedbyhardware(maxi­mumgain flat) or by software(-2dBflat).

The phoneimpedanceand sidetone can be tuned
throughexternal networks.

FURTHERADVANTAGES

The microcontroller power supply is provided by the
TEA7089A.Thepowersupplyisspecif i cal l ydesigned
tocopewitha longflas horalonggroundkeyduration.

The TEA7089A is able to supply the necessary
current to an external speakerphone circuit
TEA7540 and loudspeaker amplifier TEA7532
without any additionalcircuitry.

Line current and reset indications are provided to

DTMF GENERATOR

The onboard DTMF generator fullfils the CEPT
requirementswith an externalsinglepole filter.

the microcontrollerby theTEA7089A.
The microcontroller drivesthe TEA7089Athrough

a 2 wires serial interface.

PIN DESCRIPTION

Name Pin N° Description

SOFT 1 Transmit Softclipping Time Constant

RECIN 2 Receiving Input

SN 3 Sidetone Network Input

AGC 4 Line Current Regulation Stop Value
MIC1 5 Microphone Input
MIC2 6 Microphone Input

GTR 7 Transmit Gain Adjustment

V

CC

GND 9 Ground

IVLS 10 Line Current Source Power Supply

V

S

V

L

V

MC

GREC 14 Receive Gain Adjustment

EAR- 15 Negative Earphone Output

EAR+ 16 Positive Earphone Output

BUZ 17 RingerBuzzer Output

VRING 18 Ring Power Supply

RES 19 Reset

PON 20 Power On

RI 21 Ring Indicator
OSC 22 Oscillator Input
MSK 23 Mask, Ring Melody Input

DATA 24 Data Input

DCL 25 DataClock Input

V

RMC

V

REF

DTMF 28 DTMF Filter

2/17

8 Transmit and Receive Part Power Supply

11 Voltage Stabilizer
12 Positive Line
13 Unregulated Microcontroller Power Supply

26 Microcontroller Stabilized Power Supply
27 Reference Voltage (VCC/2)

7089A-01.TBL

Figure1 : Block Diagram

TEA7089A

CC

V

Sidetone

C30

R13

To Line

To µP

C12

C1

R40 + R15

TEA7089A

RI

21

2

RECIN SN

IVLSV

C15

C16

V

18

SUPPLY

RING POWER

LINE CURRENT

POWER SUPPLY

RMCVRING

26

BUZZER

SUPPLY

LOGIC POWER

BUZ

17

AMPLIFIER

& AGC

SIDETONE

MUTE

AGC

RING

CONTROL

C10

MC

V

13

GENERATOR

SERIAL

REGULATOR

To µP

MSK

DCL

232425

DTMF

GENERATOR

DATA

µP

INTERFACE

REF

V

OSCILLATOR /2

CONTROL

PON & RESET

OSC

1920 22

To µP

PON RES

GND

9

To Line

C8

R10

R11

CC

V

L

R12

12 8 310

S

V

C11

MUTE

DTMFAGC

28

567

MIC1

AGC

MIC2

Microphone

4

R25

CC

V

C3

C3

KVL

SOFT

R4

IN

V

1

GTR

R8

VSTAB

Earphone

Amplifier

EAR-

Earphone

-1

15

REF

V

11

27

REF

V

R14

14

GREC

16

EAR+

R17

C14

7089A-02.EPS

3/17

TEA7089A

ELECTRICALCHARACTERISTICS

Theblock diagram is given in Figure 1.
Thevalues of the differentnetworks used in this datasheetare defined as followed:

- The return loss is adjusted by R10 of 600Ω.

- The transmitadjust gainnetworkR8 is calculatedinorder to havea gainof46dB typicalwith I

- The sidetone networkZST is set to be lower than 20dB (Vear/Vmic)on a 600Ωloadon line.

- The DC characteristicsare setby a resistorof 82kΩ betweenV

and VS.

L

Absolute MaximumRatings

Symbol Parameter Value Unit

I

LINE

I

RING

T

T

oper

stg

T

Authorized Voltage on

Pin 2 - RECIN
Pin 3 - SN
Pin 8 - V
Pin 10 - IVLS
Pin 12 - V
Pin 13 - V
Pin 17 - BUZ
Pin 18 - V
Pin 19 - RES
Pin 20 - PON
Pin 21 - RI
Pin 22 - OSC
Pin 23 - MSK
Pin 24 - DATA
Pin 25 - DCL
Pin 26 - V

CC

L
MC

RING

RMC

V

V
V
V
V
V
V
V

RING

RMC
RMC
RMC
RMC
RMC
RMC
RMC

Line Current 120 mA
Ring Current 50 mA
Operating Temperature -25, +70 °C
Storage Temperature -55, +150 °C
Junction Temperature -25, +150 °C

j

13
12
11

6

12

6

+0.3, GND -0.3

27
+0.3, GND -0.3
+0.3, GND -0.3
+0.3, GND -0.3
+0.3, GND -0.3
+0.3, GND -0.3
+0.3, GND -0.3
+0.3, GND -0.3

5

LS

=22mA.

V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V

7089A-02.TBL

DC Characteristics(T

=25°C; Logic in Default Modeunless otherwise noted)

amb

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

I

VRMC

V

RMC

I

VMC

I

LS

L

Line Voltage

- In Speech and DTMF Mode

- In Mask Mode
Stabilized Supply Voltage

- Output Current

- Output Voltage IRMC = 1.5mA 3.15 3.35 3.55 V
Unstabilized Supply Voltage

- Start up Current

- Output Current
Line Current Source Supply Test 1,VLS=0V;VMC= 3.6V

Test 1

= 22mA

I

L

= 90mA

I

L

= 22mA

I

L

Test 1, IL= 22mA

V

MC

V

MC

= 22mA

I

L

= 90mA

I

L

= 22mA

L

= 2.5V, I
= 3.6V, I

Test 1, I

VRMC
VRMC

= 1.5mA
= 0mA

4

6.7

4.6

7.5

5.2

8.3
3

1.5 mA

10 15

3

10
67

14
75

18
82

Theline current sourcesupply dependsof IL:

- For I

- For I
Onthis pin the maximumoutput levelis : V

4/17

< 20mA: ILS(mA)= 0.765 x IL(mA)- 1.4mA

L

> 20mA: ILS(mA)= 0.92x IL(mA)- 4.5mA

L

10=V12

- (1.2+ 10 x ILS) and V10<6V

V
V
V

mA
mA

mA
mA

TEA7089A

ELECTRICALSPECIFICATIONS(continued)
AC Characteristics(T

Symbol Parameter Test Conditions Min. Typ. Max. Unit

R1 Return Loss Test 2, I

TransmitCharacteristics

(T

=25°C; RL= 600Ω ; f = 1kHz ; Logicin Default Mode unlessotherwisenoted)

amb

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Gtx

Gtxl

Gtxs
Zmic Microphone Input Impedance between MIC1 & MIC2 32 40 48 kΩ

Ntx Noise Test 3, 2kΩ on microphone inputs,

Mmic Microphone Mute Test 3, V

Dtx

V

Max.

L

Microphone Gain Test3, V

Soft Clipping

- Distortion

- Maximum Level on Line

=25°C;RL= 600Ω ; Logic in Default Mode unless otherwisenoted)

amb

= 22mA

f = 300/3400Hz, V

R8 = 1.3kΩ, R25 = 3.9kΩ

I

Test 3, I

L

= -55dBV

m

= 22mA

I

L

= 90mA

I

L

= 22mA

L

= -55dBV, IL= 22mA 60 dB

m

= 22mA, see Figure 2

L

= -41dBV

V

m

= -34dBV 1.5

V

m

= -10dBV

AC

17 dB

4538464047

42

-76 dBmp

2%

dB
dB

Vp

Figure2 : Softclipping

10

Threshold

Level

1

peak on line (V)

AC

V

0.1

0.1 1 10 100
V

microphon e

peak(mV)

Figure3

10

8

6

4

(Pin 12) (V)

L

V

2

VACpeak

0

0 20 406080100

IL(mA)

-15

-10

-5

-2

VACpeak

The maximum gain Gtl is adjustable between 44
and 56dB with R8 :

Gtxl = 20log



820 ⋅




R10 // R

R8 // 50k

+ R11

L

Ω

TheAGCvariationisprogrammedwithoneresistor
connected on Pin AGC. I

is the line current at

SL

whichthe gain must be decreasedby 6dB.

R25 (Ω) =

I

SL

300

− 5mA

For line current lower than I
The transmit and receive gains have a constant

7089A-03.EPS

value.

(R25 > 2.6kΩ)

or higher than ISL,

LL

If no resistor or a resistor higher than 300kΩis
connected on Pin AGC, the gain is constant and
equal to Gtxl and Grxl.±0.5dB.

AGC can be inhibited also through MCU code
”010100”. In this case Tx and Rx gains are fixed
2dB lower than the maximumgain.

The minimumsaturationvoltageof theTEA7089A
respect to ground is 2.2V. On long line, when the
voltage over TEA7089A is low, the softclipping
function automatically limits the AC dynamic to
avoidto reachthe 2.2Vlimiton TEA7089Arespect

7089A-04.EPS

to ground.





5/17

TEA7089A

ELECTRICALSPECIFICATIONS(continued)
ReceiveCharacteristics (T

Symbol Parameter Test Conditions Min. Typ. Max. Unit

E

G

G

Dr Distortion Test 4, Rear = 300Ω,I

Nr Noise Test 4, I

Vear

(010010)

Zout Output Impedance 20 Ω

Sidetone

ff

Eff = (Vear
Gain in Symmetric Mode

Grx = (Vear

RXl
RXs

+

- Vear-) /Vm

+

- Vear-)/V

Earphone Mute I

=25°C; RL=660Ω ; f = 1kHz)

amb

Test 3, V
R14 = 10kΩ, R17 = 15kΩ

= -55dBV, IL= 22mA,

m

Test 6, VL= -14.5dBV, R14 = 10kΩ,

L

R17 = 15kΩ, R25 = 3.9k

= 22mA

I

L

= 90mA

I

L

Vear = -12dBV
Vear = -8dBV

= 22mA -76 dBmp

L

= 22mA, VL= -14.5dBV 60 dB

L

Ω

= 22mA

L

0.7

-6

1.7

-4

22.5 dB

2.7

-2

2
5

dB
dB

%
%

Automatic Gain Control Inhibition (T

=25°C; RL= 660Ω; f = 1kHz no AGC mode selected)

amb

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Gtp
Grp

Transmit Gain
Receive Gain

Ring Characteristics (T

amb

=25°C)

Test3 &Test4, I
Code : 010100

= -55dBV

V

m

= -14.5dBV

V

L

= 22to 90mA

L

Gtxl -5
Grxl -5

Gtxl -4

Grxl -4

Gtxl -3
Grxl -3dBdB

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Ringing Threshold Voltage Test 5 a/b

V

Thri ON

V

Thri OFF

I

CRing

V

t

RON

V

RING

V

RMC

Internal Consumption in Ring
Mode

Microprocessor Supply Voltage 3.45 3.75 4.05 V
Rise Time I
Internal Zener Voltage 27 V
Buzzer V

bout

Freq = 1312Hz

out

Freq. Code 001111

Figure4 : RingerHysteresisRinger

ON

RI high (see Figure 4)
Rl low (see Figure 4)

V

= 10V 1 1.2 mA

RING

= 10mA 100 ms

RING

15

5

VRING = 27Vzener (see Figure 5)

Level Code (011111)
Level Code (011110)
Level Code (011101)
Level Code (011100)

12

4.4

2.2

13

5.6

2.8

1

1.4

Figure 5 : Ringer OutputWaveform

20

9

13.5

6.7

3.4

1.8

V
V

V

RMS

V

RMS

V

RMS

V

RMS

6/17

Ringer

Status

OFF

V

OFF

Ringer Threshold (V

THRI

V

bout

V

)

V

ON

7089A-05.EPS

7089A-06.EPS

TEA7089A

ELECTRICALSPECIFICATIONS(continued)
DTMF Generator(T

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Amf Tone Frequency Accuracy Test 6 Pin Osc

Llf

Lhf

Low Freq. Group Line Level
High Freq. Group Line Level

Pmf Preemphasis HF/LF +1 +2 +3 dB

t

DON

t

DOFF

Rise Time
Decay Time

Cmf DTMF Confidence Tone :

Earphone level (low freq.)
Earphone level (high freq.)

– - Unwanted Harmonics Level (see Figure 6) ––––

Figure6 : UnwantedHarmonics Level in DTMF

-30

=25°C; RL= 660Ω)

amb

fclock = 1.79MHz oscillator off
or
Resonator :3.58MHzoscillatoron
C13 =100nF, I

= 22mA

L

- 0.4 0.4 %

-10

-8

-8.5

-6.5

-7

-5

5
5

13
17

17
22

21
27

dBm
dBm

ms
ms

mV
mV

-50

-70

Vline (dBm)

-90
100 1k 10k 100k 1M

(Hz)

Figure 7 : Microcontroller Interface

V

MC

13

Batte ry

C10

47 F

V

5.6V

REFI

7089A-07.EPS

V

RING

V

L

I

Speech

I

Start-u p

kIL

18

I(In Ring)

V

(3.4V)

RMC

26

C15
10 F P+LCD

7/17

7089A-08.EPS

TEA7089A

MICROCONTROLLER INTERFACE WITH TEA7089A

All inputs can be driven by a Low level max. of

0.1 x V

anda high level min. of 0.9 x V

RMC

Inputs MSK, DCL and DATA have internal pull-up
resistors of 120kΩand input OSC has a internal
pullup of 240kΩ.

Alloutputs can drivea ±1mA typical.

PowerSupply

The microcontroller is power supplied by a 3.4V
regulated supply (V
powersupply (V

MC

) and by an unregulated

RMC

).

The two supplies are connected through a serial
regulator.The unregulatedpower supply(V
aDCvoltageequalto: V

-0.6Vandmustbelower

12

than 6V.It is also possible to connect a battery at
PinV

and use the regulatedoutputat Pin V

MC

to supplya LCD driver.
The current consumption on the serial regulator

hasa typical value of 60µA.
PowerON (PON)

TheTEA7089Ageneratesa poweron signal(PON)
as soonas the voltage on Pin V

2.6V (0.75x V

final)andthe line currentis pre-

RMC

is higher than

RMC

sent.
Note : During the break period in the

loopdisconndect and Flash mode and
during the exchange line break, the power
ONsignalgoesto lowlevel.Maximumdelay
for Pon decay edge after I

goesto zero

Line

is 50ms (with C8 = 47µF, C11 = 1µF,
C27 = 10µF).

Reset

TheTEA7089Ageneratesarise edgeResetsignal
as soon as the logic power supply is higher than

2.6V (0.75x V
RESETremains high until V

RMC

final).

decreasesbelow

RMC

2.5V or the RESET control code is received. In
Ring,RESET is identical to RI output.

Only new positive edge PON, derivedon opening
and closing the line, is forcing the default mode
again. The Reset control code is only active in
speechmode.

RMC

MC

.

)has

RMC

Serial Bus Interface (Dataand Clock)
Theserial bususes 6 bits.Astandard8bit buscan

be used, bits a6 and a7 are nottake in accountby
the TEA7089A.Different typesof codes areused:

a) The Ring Control Code :

- Ring start up

- Outputlevel codes

b) The Operating Code :

- Speech

- Dialing

- Microphonemute

- Earphone/Microphonemute

c) The Data Codes (DTMF, ring frequencies) :

Those data c odes are stored insid e the
TEA7089Aand are used as soon as the dialing
code or thering start code is received.

d) The Configuration Code :

- AGC / no AGC(toggle)

- No mask / mask(Low DC in ”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
is sent, the receivegain increases of +6dB.
If the samecode is sent again, the receivegain
goesbackto normalvalue.In thesameway the

3.58MHz internal oscillator can be switched

OFF with a second transmission of the proper
code.

e) The RESET Code :

ResetcodefromtheMCUwillresetinternallogic
of TEA7089A to default mode and will induce
TEA7089Ato generatea ”RESET” status”low”
to the MCU on Pin 19.
Warning : the ”RESET” code deactivates the
serial bus interface which is reactivated only
aftera ”ON-HOOK/OFF-HOOK”sequence.

f) The INITIALIZATION Code :

Initialization code from the MCU will reset the
internallogic of TEA7089Ato default mode, but
theTEA7089Awillnot generatereset command
to the MCU on Pin 19.

8/17

MICROCONTROLLER INTERFACE WITH TEA7089A(continued)
Figure8 : Resetand Power ON

Without us ing the RESET Code through the Serial Bus Interface

I

AABCD DE

L

TEA7089A

V

MC

5

2.7

V

RMC

3.4

2.6

PON

RESET

Us in g the RESET Code through the Serial Bus Interface

I

AB CD DEDFA

L

V

MC

5

2.7

t

t

2.5V

t

t

t

t

V

RMC

3.4

2.6

PON

RESET

A:ON-HOOK
B : START UP + SPEECH
C : PULSE DIALING
D : SPEECH or DTMF
E : LINE B REAKEXCHANGE DURATION
F : LINE BREAK EXCHANGE DURATION > t
td: DELAYFIXED BY THE MICROCONTROLLER

d

tdtd

Re se t con trolcod e (010111 )

sent on the serialbus

t

2.5V

t

t

t

7089A-09.EPS

9/17

TEA7089A

MICROCONTROLLER INTERFACE WITH TEA7089A(continued)
TheStart Up Conditions of the TEA7089A

Assoon as RESETis highand beforesending any
code the circuit is in the following default configu­ration:

- Speech

- No mask

- AGC ON in transmit and receive channels

- Normalgain on receivechannel

- 1.79MHz input clock(oscillator in stand by)

microcontroller through thehigh voltage stage.
The ”MAKE” voltage over the TEA7089A during

dialing can be reduced by sending the mask code

0010101.To recoverthe normalspeech voltageat
the end of dialing the mask code must be sent
again.

If the mask code is not used the voltage over the
TEA7089Aduring dialingis the same asin speech
mode.

6 bit Codes

Between two DTMF or ring frequencies, introduc­ing a Mute or speech code implies to wait 1ms to
end the sinewaveor square period.

DTMF Dialing

To dial in DTMF the following sequence of codes
must be sent :

DTMF Frequencycode : 00XXXX
DialingMode code : 010001
Muteor SPEECHcode : 010010 or010000

The duration of the DTMF signal is fixed by the
delay between Dialing mode code and MUTE or
SPEECHcode.

PulseDialing

The pulse dialing function is performed by the
Figure9 : DATA/CLOCKTiming

t1 t2 t4 t5

t3 t3t0

CLK Data

Data

a0 a1 a 2 a3 a4 a5 a6

Ring Indicator(RI)

In ring mode TEA7089A generates a high logic
levelon PinRI as soonas thevoltageon PinV
ishigherthan V
on V

is higher than3.4V.

RMC

When the voltage on V

ON(19VTyp.),andthevoltage

THRI

becomes higher than

RMC

RING

2.6V,RESET signal becomes also high.

Mask Input (MSK)

MSK inputmust be high by default (Figure 10).
In speech configuration forcing MSK input to low

level will have same functionality than the MASK
code.

For ring mode when it is necessaryto send other
frequenciesthanthe 8basicones,this inputallows
to drive the buzzer output.

Synchro

Figure10 : MASK Timing

I

L

MSK

10/17

Datas with a Change During CLK= 1

PULSE MODE OTHER MODES OTHER MODESFLASH MODE

t0, t1, t2, t3, t4, t5 > 1µs

7089A-10.EPS

7089A-11.EPS

MICROCONTROLLER INTERFACE WITH TEA7089A(continued)

Codes

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

010101 Mask/No Mask
010110”+6dB” Normal/+6dBon Receive Channel
010111 Reset Pin Control
111010 Initialization Code
010100 AGC/NoAGC
101000 1.79MHz Ext Clock & Oscillator Stand by /

011100 MinimumRing Level (level 1)
011101 Intermediate Low Ring Level (level 2)
011110 Intermediate High Ring Level (level 3)
011111 Maximum Ring Level (level 4)

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

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

0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1

0
0
0
0
1
1
1
1

0
0
0
0

0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1

0
0
1
1
0
0
1
1

0
0
1
1

Keyboard Remarks

0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1

0
1
0
1
0
1
0
1

0
1
0
1

”2”
”1”

”A”

”3”
”8”
”7”

”C”

”9”
”5”
”4”

”B”

”6”
”0”

”*”

”D”

”#”

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

822Hz Ring Signal
744Hz Ring Signal
1005Hz Ring Signal
909Hz Ring Signal
1187Hz Ring Signal
1074Hz Ring Signal
1451Hz Ring Signal
1312Hz Ring Signal

Speech Mode
Dialing Mode or Ring Start
Earphone & Microphone Mute
Microphone Mute

3.58MHz Ceramic (toggle)

TEA7089A

In DTMF

Dialing

In Ring

Mode

7089A-03.TBL

11/17

TEA7089A

Figure11 : Test Circuits- Test 1 (VL/V

100µF

I

L

600

V

REF

Ω

560k

100nF

100nF

10µF

47nF

Ω

47µF

10µF

100µF

47

10µF24V

C2

4.7nF
V

Ω

620

CC

3.9kΩ

4

AGC

1

SOFT

26

V

RMC

28

DTMF

27

V

REF

13

V

MC

Ω

17

BUZ

18

V

RING

RMC/VMC

/ IVMC / ILS)

33Ω

13V

82k

1.6k

Ω

Sidetone

Ω

15kΩ

1µF

100nF

23

8

CC

V

RECIN

11 12

S

V

L

V

GTR

GREC

SN

7

14

1.3kΩ
10kΩ

15kΩ

16

EAR+

TEA7089A

300

Ω

2.2µF

15

EAR­MIC2

Ω

2k

6

470nF

5

MIC1

1N4148

10

DCL

DATA

MSK

OSCRIPON

IVLS

RESET

GND

19202122232425

9

I

47µF

LS

V

CC

V

REF

V

CC

Figure12 : Test 2 (R1)

I

AC

100µF

12/17

I

L

V

Z=

REF

560kΩ

100nF

100nF

10µF

47nF

V

AC

I

AC

24V

V

AC

47µF

C2

4.7nF

10µF

100µF

47Ω

10µF

RI = 20log

620Ω

13V

V

CC

1µF

3.9kΩ

RECIN

TEA7089A

DATA

MSK

11 12

V

OSCRIPON

8

23

4

AGC

CC

V

SOFT

26

V

RMC

28

DTMF

27

V

REF

13

V

MC

17

BUZ

18

V

Z +600

Z - 600

RING

DCL

S

33Ω

82kΩ

1.6kΩ

Sidetone

15kΩ

100nF

L

V

GREC

EAR+

SN

7GTR1

14

16

2.2µF

15

EAR-

2kΩ

6

MIC2

470nF

5

MIC1

1N4148

10

IVLS

RESET

GND

19202122232425

9

I

LS

47µF

1.3kΩ

10kΩ

15kΩ

300Ω

7089A-12.EPS

V

CC

V

REF

V

CC

7089A-13.EPS

Figure13 : Test 3 (Gtl / Gts / Zmic / Nt / Mmic/ Dt / Vlmax/ Eff)

33Ω

100µF

I

L

600Ω

V

REF

560kΩ

100nF

47µF

10µF

C2

4.7nF

620Ω

V

CC

3.9kΩ

23

4
1

26

8

CC

AGC

V

SOFT
V

RMC

RECIN

13V

1µF

11 12

S

V

82kΩ

100nF

28

DTMF

27

V

10µF

100µF

47Ω

REF

13

V

MC

17

BUZ

TEA7089A

47nF

18

V

10µF24V

RING

DCL

DATA

MSK

OSCRIPON

19202122232425

Gtl/Gts = 20 log

V

12

V

m

Mmic = 20 log

V

12

V

12

(010000)
(010011)

Eff = 20 log

V

ear

V

m

Figure14 : Test 4 (Grl / Grs / Dr / Mear / Nr)

Sidetone

1.6kΩ

15kΩ

100nF

L

V

GTR

GREC

EAR+

SN

7

14

16

2.2µF

15

EAR-

6

MIC2

2kΩ

Vm

470nF

5

MIC1

10

IVLS

RESET

GND

9

1N4148

I

47µF

LS

1.3kΩ

10kΩ

15kΩ

300Ω

V

CC

V

REF

V

ear

V

CC

TEA7089A

7089A-14.EPS

I

AC

I

L

V

REF

560kΩ

100nF
100nF

10µF

47nF

24V

Grl/Grs = 20log

100µF

V

AC

47µF

10µF

100µF

47Ω

10µF

V

ear

V

12

C2

4.7nF

620Ω

V

CC

3.9kΩ

23

8

RMC

REF

MC

RING

V

CC

DCL

RECIN

DATA

AGC

4
1

SOFT

26

V

28

DTMF

27

V

13

V

17

BUZ

18

V

33Ω

13V

82kΩ

1µF

11 12

S

V

TEA7089A

MSK

OSCRIPON

1.6kΩ

Sidetone

15kΩ

100nF

L

V

GTR

GREC

EAR+

SN

7

14

16

2.2µF

15

EAR-

MIC2

2kΩ

6

470nF

5

MIC1

1N4148

10

IVLS

RESET

GND

19202122232425

9

I

47µF

LS

1.3kΩ

10kΩ

15kΩ

300Ω

V

CC

V

REF

V

ear

V

CC

7089A-15.EPS

13/17

TEA7089A

Figure15 : Test 5a (V

47µF

V

REF

560kΩ

100nF
100nF

10µF

47nF

V

bout

thri

24VV

thri

10µF

100µF

10µF

)

C2

4.7nF

620Ω

V

CC

3.9kΩ

8

RMC

REF

RING

V

CC

DCL

AGC

4
1

SOFT

26

V

28

DTMF

27

V

13

VMC

47Ω

17

BUZ

18

V

33Ω

13V

82kΩ

1.6kΩ

Sidetone

15kΩ

V

CC

1µF

100nF

23

RECIN

11 12

S

V

1.3kΩ

10kΩ

V

REF

L

V

GTR

GREC

SN

7

14

15kΩ

16

EAR+

TEA7089A

300Ω

2.2µF

15

EAR-

2kΩ

6

MIC2

470nF

5

MIC1

1N4148

IVLS

DATA

MSK

OSCRIPON

GND

10

RESET

9

19202122232425

47µF

V

CC

Figure16 : Test 5b (V

V

REF

560k

100nF
100nF

10µF

47nF

V

bout

I

RING

bout

Ω

47µF

)

10µF

100µF

47

10µF

C2

4.7nF
V

Ω

620

CC

3.9kΩ

23

8

RMC

REF

MC

RING

V

CC

DCL

RECIN

DATA

AGC

4

SOFT

26

V

28

DTMF

27

V

13

V

Ω

17

BUZ

18

V

33Ω

13V

82k

1µF

11 12

S

V

TEA7089A

MSK

OSCRIPON

1.6k

Ω

Sidetone

Ω

100nF

L

V

RESET

19202122232425

SN

7GTR1

14

GREC

16

EAR+

15

EAR-

6

MIC2

5

MIC1

10

IVLS

GND

9

2.2µF

2k

470nF

I

LS

15kΩ

Ω

15kΩ

300

1N4148

47µF

1.3kΩ

10kΩ

Ω

7089A-16.EPS

V

CC

V

REF

V

CC

14/17

6 bit serialcode (0111XX/Fi/010001) ; OSCIN = 1.79MHz external clock (default mode)
or 3.58MHz external ceramic/crystal (with code ”101000” to select internal oscillator)

7089A-17.EPS

Figure17 : Test 6 (DTMF)

100µF

I

L

600Ω

47µF

V

REF

560kΩ

100nF

100nF

10µF

100µF

47nF

10µF

47Ω

10µF

C2

4.7nF

620Ω

V

CC

3.9kΩ

23

8

RMC

REF

MC

RING

V

CC

DCL

RECIN

DATA

AGC

4
1

SOFT

26

V

28

DTMF

27

V

13

V

17

BUZ

18

V

33Ω

13V

82kΩ

1µF

11 12

S

V

TEA7089A

MSK

OSCRIPON

1.6kΩ

Sidetone

15kΩ

100nF

L

V

GTR

GREC

EAR+

SN

7

14

16

2.2µF

15

EAR-

MIC2

2kΩ

6

470nF

5

MIC1

1N4148

10

IVLS

RESET

GND

19202122232425

9

I

47µF

LS

1.3kΩ

10kΩ

15kΩ

300Ω

TEA7089A

V

CC

V

REF

V

CC

6 bit serial code (00XXXX/Fi/010010) ; OSCIN = 1.79MHz external clock (default mode)
or 3.58MHz externalceramic/crystal (with code ”101000” to select internal oscillator)

7089A-18.EPS

15/17

TEA7089A

TYPICALAPPLICATION

Q1 BSS92

R27

5.6

Ω

R28 22k

Ω

V

CC

C8

47µF

V

D11 6.2V

C1

820nF

R40 1k

A

Ω

REF

R4 560k

C3 100nF

C13 100nF

R25

Ω

SW1A

B

D8D9

C14
47nF

4 x 1N4004

D7D6

Buzzer

R15 1k

SW1B

Ω

24V

C10
470µF

47

C16

D3

10µF

Impedance

C2

4.7nF

Ω

R10

620

Ω

8

23

CC

AGC

4

28
27
13

17

18

SOFT

DTMF
V

REF

V

MC

BUZ

V

RING

V

V

RECIN

RMC

DCL

DATA

C15 4.7µF

22k

R29

R2
330k

Ω

Ω

R11 33Ω

D2 13V

R12 82k

C11
1µF

11 12

S

V

TEA7089A

MSK

RI

PON

Sidetone

R13 300

Ω

C12

100nF

L

V

GREC

EAR+

EAR-

MIC2

MIC1

IVLS

RESET

192021 2223242526

OSC

GND

9

3.58MHz
X2

R5

Ω

SN

7GTR1

14

16

15

6

5

10

R17
15k

R21
2k

C30
47nF

Ω

C21 47nF

Ω

C22 47nF

C5

R6

C26 1µF

C17

2.2nF

V

CC

R8 1.3k

R14 10k

V

CC

V

REF

Ω

Ω

Handset

Q3

BF393

D5 BAT42

C19

30pF

C18
30pF

X1

MCU

123S
456M
789L

*0#R

7089A-19.EPS

16/17

PACKAGE MECHANICAL DATA

28 PINS - PLASTICPACKAGE

TEA7089A

Dimensions

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

Millimeters Inches

A 2.65 0.104

a1 0.1 0.3 0.004 0.012

b 0.35 0.49 0.014 0.019

b1 0.23 0.32 0.009 0.013

C 0.5 0.020

c1 45

o

(Typ.)
D 17.7 18.1 0.697 0.713
E 10 10.65 0.394 0.419

e 1.27 0.050

e3 16.51 0.65

F 7.4 7.6 0.291 0.299

L 0.4 1.27 0.016 0.050

S8

Information furnished is believed to be accurate and reliable. However, STMicroelectronics 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 STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previouslysupplied.STMicroelectronicsproducts are notauthorized foruseas criticalcomp onentsin lifesupport devicesor systems
without express written approval of STMicroelectronics.

Purchase of I

Rights to use these components in a I

Australia - Brazil - Canada - China - France- Germany - Italy - Japan - Korea - Malaysia - Malta - Morocco- The Netherlands

2

C Components of STMicroelectronics, conveys a licenseunder the PhilipsI2C Patent.

Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.

The ST logo is a trademark of STMicroelectronics
 1998STMicroelectronics - All Rights Reserved

2

2

the I

C Standard Specifications as defined by Philips.

STMicroelectronics GROUP OF COMPANIES

C system,is granted provided that the system conforms to

o

(Max.)

PM-SO28.EPS

SO2 8.TB L

17/17