Philips TEA1069AH Datasheet

INTEGRATED CIRCUITS

DATA SH EET

TEA1069; TEA1069A

Versatile speech/dialler/ringer with music-on-hold

Product speciﬁcation Supersedes data of 1996 Dec 10 File under Integrated Circuits, IC03

1998 Jan 08

Philips Semiconductors Product speciﬁcation

Versatile speech/dialler/ringer with music-on-hold

FEATURES Speech part

• Voltage regulator with adjustable static resistance

• Low DC line voltage; operates down to 1.6 V

(excluding polarity guard)

• Supply for dialler part and peripherals (not stabilized)

• Symmetrical high-impedance inputs (64 kΩ) for

dynamic, magnetic, or piezoelectric microphones

• Asymmetrical high-impedance input (32 kΩ) for electret microphones

• Asymmetrical earpiece output for dynamic, magnetic, or piezoelectric earpieces

• Internal mute to disable speech during dialling

• Confidence tone during DTMF dialling

• Line-loss compensation (line-current dependent) for

microphone and earpiece amplifiers

• Gain-control curve adaptable to the exchange supply.

Dialler part

• Pulse/DTMF and mixed mode dialling

• Last Number Redial (LNR), up to 32 digits

• 13 repertory numbers (3 direct and 10 indirect) or

10 repertory numbers (10 direct), up to 32 digits, with a maximum of 224 digits in total

• Repertory and redial memory integrity check (memory contents check)

• Notepad memory function

• Flash and earth register recall

• Dial mode output

• Access pause generation and termination

• Function keys for: store, memory recall, register recall,

LNR, pause, hold, mute, hook

• Keytone generation

• Hands-free control

• Volume control in hands-free mode (VOL+/VOL−)

• Hold function

• Mute function

• Music-on-hold

• Diode options:

– DTMF tone burst/pause time – make/break ratio – access pause time

TEA1069; TEA1069A

– pulse or DTMF mode selection – register recall (earth and flash times) – keyboard layout selection – selection for german requirements – hold/mute mode selection.

Ringer part

• Ringer input frequency discrimination

• Ringer melody generation (3-tone)

• Ringer melody selection/volume control via keyboard

• Diode option: ringer frequency selection.

GENERAL DESCRIPTION

The TEA1069 and TEA1069A contain all the functions needed to build a highly featured, high-performance fully electronic telephone set.

The device incorporates a speech/transmission part, a dialler part and a ringer part. By offering a wide range of possible adaptations for each part, the TEA1069 and TEA1069A application can be easily adapted to meet different requirements.

The TEA1069A offers some different timings and diode options compared to the TEA1069.

Where pin numbers are mentioned in this data sheet we refer to the TEA1069N, unless otherwise indicated.

Speech part

The speech/transmission part performs all speech and line interface functions required in electronic sets. It operates at line voltages down to 1.6 V DC to facilitate the use of more telephones connected in parallel.

Dialler part

The dialler part offers a 32-digit Last Number Redial (LNR) and 13 memories. Hands-free control is included allowing the TEA1069 and TEA1069A to be used not only in basic telephones, but also in feature phones offering hands-free dialling via the TEA1083 call-progress monitor IC and/or full hands-free operation via the TEA1093 hands-free IC. The hold function allows the user to suspend the conversation and resume the call either on the same phone or on a parallel phone. Additionally through the music-on-hold function a melody is transmitted while the set is put on hold. The keytones provide in a buzzer an audible feedback of a valid key pressed.

1998 Jan 08 2

Philips Semiconductors Product speciﬁcation

Versatile speech/dialler/ringer with

TEA1069; TEA1069A

music-on-hold

Ringer part

The ringer part offers a discriminator input which enables the tone output as soon as a valid ring frequency is detected. It offers a melody based on 3 tones with programmable melody and volume via keyboard.

ORDERING INFORMATION

TYPE

NUMBER

TEA1069N SDIP42 plastic shrink dual in-line package; 42 leads (600 mil) SOT270-1 TEA1069H QFP44 plastic quad ﬂat package; 44 leads (lead length 1.3 mm);

TEA1069AH QFP44 plastic quad ﬂat package; 44 leads (lead length 1.3 mm);

NAME DESCRIPTION VERSION

body 10 × 10 × 1.75 mm

PACKAGE

SOT307-2

1998 Jan 08 3

Philips Semiconductors Product speciﬁcation

Versatile speech/dialler/ringer with music-on-hold

BLOCK DIAGRAM

AGCIRMUTEMOH/DMODP/FLKT/EARTH

GAR

(40) 2

(36)

(34)

SPEECH

(44)

(32)

(31)

(22)

PULSE

(15)

(39) 1

RECEIVE

SECTION

MUTE

GAS1

(37) 41

SECTION

TRANSMIT

HOLD

LOGIC

GAS2

(38) 42

TEA1069

TEA1069A

SUPPLY

RINGER

TEA1069; TEA1069A

MBH195

(35)

SLPE

(43)

STAB

(33)

REG

(11, 18

and 23)

(41)

MIC−

MIC+

DTMF

HOLD

DETECTOR/

GENERATOR

(42) (1)

(16)

(17)

(21)

4 7

handbook, full pagewidth

Fig.1 Block diagram.

RECALL

(2)

KEY-

TONE

DETECTOR

KEYBOARD

TONE

DIALLER

34 (30)

33 (29)

32 (28)

31 (27)

30 (26)

29 (25)

14 (8)

15 (9)

16 (10)

17 (12)

18 (13)

COL6

COL5

COL4

COL3

ROW5

DIODE

ROW4

ROW3

ROW2

ROW1

COL2

1998 Jan 08 4

GENERATOR

19 (14)

9 (3)

CSI

COL1

10 (4)

XTAL1

TIMING/

CONTROL

11 (5)

12 (6)

XTAL2

13 (7)

CE/FDI

RESET

(19)

(24)

25 (20)

HF TONE VOL1 VOL2

Pin numbers in parenthesis refer to the TEA1069H and TEA1069AH.

Philips Semiconductors Product speciﬁcation

Versatile speech/dialler/ringer with

TEA1069; TEA1069A

music-on-hold

PINNING

SYMBOL

QR 1 39 receiving ampliﬁer output GAR 2 40 gain adjustment; receiving ampliﬁer MIC− 3 41 inverting microphone input MIC+ 4 42 non-inverting microphone input STAB 5 43 current stabilizer IR 6 44 receiving ampliﬁer input DTMF 7 1 dual-tone multi-frequency input KT/EARTH 8 2 keytone/earth recall output CSI 9 3 cradle switch input XTAL1 10 4 oscillator input XTAL2 11 5 oscillator output RESET 12 6 reset input CE/FDI 13 7 chip enable/frequency discrimination input COL6 14 8 keyboard column input 6 COL5 15 9 keyboard column input 5 COL4 16 10 keyboard column input 4 COL3 17 12 keyboard column input 3 COL2 18 13 keyboard column input 2 COL1 19 14 keyboard column input 1 DP/FL 20 15 dial pulse/ﬂash output HOLD 21 16 hold control input VOL2 22 17 volume 2 output V

TONE 24 19 tone generator output V

VOL1 26 21 volume 1 output MOH/DMO 27 22 music on hold/dial mode output HF 28 24 hands-free control output ROW1 29 25 keyboard row input/output 1 ROW2 30 26 keyboard row input/output 2 ROW3 31 27 keyboard row input/output 3 ROW4 32 28 keyboard row input/output 4 ROW5 33 29 keyboard row input/output 5 DIODE 34 30 diode option output MUTE 35 31 mute output, active LOW V

REG 37 33 (DC) line voltage regulator decoupling AGC 38 34 automatic gain control input

SOT270-1 SOT307-2

DESCRIPTION

23 11, 18, 23 negative line terminal

25 20 dialler/ringer part supply voltage

36 32 speech part supply voltage

1998 Jan 08 5

Philips Semiconductors Product speciﬁcation

Versatile speech/dialler/ringer with

TEA1069; TEA1069A

music-on-hold

SYMBOL

SOT270-1 SOT307-2

SLPE 39 35 slope (DC resistance) adjustment LN 40 36 positive line terminal GAS1 41 37 gain adjustment; transmitting ampliﬁer GAS2 42 38 gain adjustment; transmitting ampliﬁer

handbook, halfpage

GAR MIC− MIC+

STAB

DTMF

KT/EARTH

CSI XTAL1 XTAL2

RESET CE/FDI

COL6 COL5 COL4 COL3 COL2

COL1 DP/FL HOLD

1 2 3 4 5 6 7 8

9 10 11

TEA1069N

12 13 14 15 16 17 18 19 20

MBH196

GAS2

GAS1

SLPE

AGC

REG V

36 35

MUTE DIODE

34 33

ROW5 ROW4

32 31

ROW3 ROW2

30 29

ROW1 HF

28 27

MOH/DMO VOL1

TONE

23 2221

VOL2

DESCRIPTION

Fig.2 Pin configuration (SOT270-1).

1998 Jan 08 6

Philips Semiconductors Product speciﬁcation

Versatile speech/dialler/ringer with music-on-hold

STAB

handbook, full pagewidth

DTMF

KT/EARTH

CSI

XTAL1

XTAL2 RESET CE/FDI

COL6 COL5 COL4

1 2 3 4 5 6 7 8

9 10 11

MIC+

MIC−

GARQRGAS2

TEA1069H

TEA1069AH

TEA1069; TEA1069A

GAS1LNSLPE

AGC

REG V

MUTE

DIODE

30 29

ROW5 ROW4

ROW3

ROW2

ROW1

COL3

COL2

COL1

DP/FL

Fig.3 Pin configuration (SOT307-2).

FUNCTIONAL DESCRIPTION Speech part

For numbering of components refer to Figs 28 and 29.

SUPPLIES VCC, LN, SLPE, REG AND STAB Power for the IC and its peripheral circuits is usually

obtained from the telephone line (see Fig.4). The circuit creates a stabilized voltage (V

= 3.7 V)

ref

between LN and SLPE. This reference voltage is temperature compensated and can be adjusted by means of an external resistor RVA. It can be increased by connecting an RVA resistor (R60) between REG and SLPE or decreased by connecting an RVA resistor (R61) between REG and LN. This internal voltage reference is decoupled by capacitor C3 between REG and VEE.

MBH784

HOLD

VOL2

TONE

VOL1

MOH/DMO

This decoupling capacitor realises the set impedance conversion from its DC value to its AC value in the audio frequency range.

The internal transmission part of the circuitry (including the earpiece amplifier) is supplied from V

. This voltage

supply is derived from the LN voltage via a dropping resistor (R1) and must be decoupled by a capacitor (C1) between VCC and VEE. This supply point may also be used to supply the dialler/ringer (VDD) part or external circuit e.g. electret microphone.

The DC current flowing into the set is determined by the exchange supply voltage V resistance R line R

. When the line current (I

line

and the DC resistance of the telephone

exch

, the feeding bridge

exch

) is more than 0.5 mA

line

greater than the sum of the IC supply current (ICC) and the current drawn by the peripheral circuitry connected to V (Ip), the excess current is shunted to SLPE via LN.

1998 Jan 08 7

Philips Semiconductors Product speciﬁcation



Versatile speech/dialler/ringer with music-on-hold

handbook, full pagewidth

exch

line

TEA1069 TEA1069A

Fig.4 Supply arrangement.

line

+ 0.5 mA

SLPE

SLPESTABREG

SLPE

C3 R5 R9

0.5 mA

TEA1069; TEA1069A

peripheral

circuits

MBH197

Thus, the regulated voltage on the line terminal (VLN) can be calculated as:

V I

SLPEIlineICCIp

ref

refISLPE

–=

is the internally generated temperature compensated

R9×+=

, where



0.5 103–A×++

reference voltage of 3.7 V and R9 is an external resistor connected between SLPE and V

The circuit has an internal current stabilizer operating at a level determined by resistor R5 connected between STAB and V

In normal use the value of R5 would be 3.6 kΩ and the value of R9 would be 20 Ω.

Changing the value of R5 or R9 will affect microphone gain, DTMF gain, gain control characteristics, sidetone level, maximum output swing on LN and the DC characteristics (especially at low line current).

At line currents below 9 mA the internal reference voltage is automatically adjusted to a lower value (typically 1.6 V

at 1 mA). This means that more sets can be operated in parallel with DC line voltages (excluding the polarity guard) down to an absolute minimum voltage of 1.6 V. At line currents below 9 mA the circuit has limited sending and receiving levels.

Under normal conditions, when I

>> ICC+ 0.5 mA + Ip,

SLPE

the static behaviour of the circuit is that of a 3.7 V regulator diode (V

) with an internal resistance equal to that of R9.

ref

In the audio frequency range the dynamic impedance is largely determined by R1. Figure 5 shows the equivalent impedance of the circuit.

Current (Ip) available from VCC for the dialler part and peripheral circuits depends on the external components used. Figure 6 shows this current for VCC> 2.2 V. When MUTE is HIGH i.e. when the receiving amplifier (supplied from VCC) is driven, the available current is further reduced. Current availability can be increased by connecting the supply IC TEA1081 in parallel with R1, or by increasing the DC line voltage by means of an external resistor (RVA= R60) connected between REG and SLPE.

1998 Jan 08 8

Philips Semiconductors Product speciﬁcation

Versatile speech/dialler/ringer with music-on-hold

handbook, halfpage

SLPE

R9 20 Ω

ref

REG

4.7 µF C1100 µF

MGD489

TEA1069; TEA1069A

Leq=C3×R9 × Rp. Rp= 16.2 kΩ.

Fig.5 Equivalent impedance circuit.

2.4

handbook, halfpage

(1)

(mA)

(2)

1.6

0.8

012 4

MSA504

VCC(V)

VCC> 2.2 V; I (1) Ip= 2.1 mA. The curve is valid when the receiving amplifier is not driven or when MUTE = LOW. (2) Ip= 1.7 mA. The curve is valid when MUTE = HIGH and the receiving amplifier is driven; V

= 15 mA at VLN= 4 V; R1 = 620 Ω; R9 = 20 Ω.

line

Fig.6 Typical current IP available from VCC for peripheral circuitry.

1998 Jan 08 9

= 150 mV, RL= 150 Ω.

o(rms)

Philips Semiconductors Product speciﬁcation

Versatile speech/dialler/ringer with

TEA1069; TEA1069A

music-on-hold

MICROPHONE INPUTS MIC+ AND MIC− AND GAIN PINS GAS1 AND GAS2 The circuit has symmetrical microphone inputs. Its input impedance is 64 kΩ (2 × 32 kΩ) and its voltage gain is typically

52 dB (when R7 = 68 kΩ). Dynamic, magnetic, piezoelectric or electret (with built-in FET source followers) microphones can be used. Microphone arrangements are illustrated in Fig.7.

handbook, full pagewidth

36 (32)

4 (42)

MIC+

(1)

3 (41)

MIC−

a. Magnetic or dynamic

microphone.

3 (41)

MIC−

4 (42)

MIC+

b. Electret microphone.

23 (18)

c. Piezoelectric microphone.

4 (42)

3 (41)

MIC+

MIC−

MBH198

Pin numbers in parenthesis refer to the TEA1069H and TEA1069AH. (1) Resistor may be connected to reduce the terminating impedance.

Fig.7 Alternative microphone arrangements.

The gain of the microphone amplifier can be adjusted between 44 dB and 52 dB to suit the sensitivity of the transducer in use. The gain is proportional to the value of R7 which is connected between GAS1 and GAS2. Stability is ensured by two external capacitors, C6 connected between GAS1 and SLPE and C17 connected between GAS1 and VEE. The value of C6 is 100 pF but this may be increased to obtain a first-order low-pass filter. The value of C17 is 10 times the value of C6. The cut-off frequency corresponds to the time constant R7 × C6.

ECEIVING AMPLIFIER IR, QR AND GAR

R The receiving amplifier has one input (IR) and one output

(QR). Earpiece arrangements are illustrated in Fig.8. The IR to QR gain is typically 31 dB (when R4 = 100 kΩ).

It can be adjusted between 20 and 31 dB to match the sensitivity of the transducer in use. The gain is set with the value of R4 which is connected between GAR and QR. The overall receive gain, between LN and QR, is calculated by subtracting the anti-sidetone network attenuation (32 dB) from the amplifier gain. Two external capacitors, C4 and C7, ensure stability. C4 is normally 100 pF and C7 is 10 times the value of C4. The value of C4 may be increased to obtain a first-order low-pass filter. The cut-off frequency will depend on the time constant R4 × C4.

The output voltage of the receiving amplifier is specified for continuous-wave drive. The maximum output voltage will be higher under speech conditions where the peak to RMS ratio is higher.

1998 Jan 08 10

Philips Semiconductors Product speciﬁcation

Versatile speech/dialler/ringer with music-on-hold

, full pagewidth

1 (39)

23 (18)

a. Dynamic earpiece. b. Magnetic earpiece. c. Piezoelectric earpiece.

Pin numbers in parenthesis refer to the TEA1069H and TEA1069AH. (1) Resistor may be connected to prevent distortion (inductive load). (2) Resistor is required to increase the phase margin (capacitive load).

Fig.8 Alternative receiver arrangements.

(1) (2)

1 (39)

QR QR

23 (18)

TEA1069; TEA1069A

1 (39)

23 (18)

MBH199

DUAL TONE MULTI-FREQUENCY INPUT DTMF When the DTMF input is enabled (MUTE is LOW) dialling

tones may be sent on to the line. The voltage gain from DTMF to LN is typically 25.5 dB (when R7 = 68 kΩ) and varies with R7 in the same way as the microphone gain. The tones can be heard in the earpiece at a low level (confidence tone).

microphone amplifier and the receiving amplifier in accordance with the DC line current.

The control range is 5.8 dB which corresponds to a line length of 5 km for a 0.5 mm diameter twisted-pair copper cable with a DC resistance of 176 Ω/km and average attenuation of 1.2 dB/km. Resistor R6 should be chosen in accordance with the exchange supply voltage and its feeding bridge resistance (see Fig.9 and Table 1).

UTOMATIC GAIN CONTROL INPUT AGC

Automatic line loss compensation is achieved by connecting a resistor (R6) between AGC and VEE. The automatic gain control varies the gain of the

The ratio of start and stop currents of the AGC curve is independent of the value of R6. If no automatic line-loss compensation is required the AGC pin may be left open-circuit. The amplifiers, in this condition, will give their maximum specified gain.

1998 Jan 08 11

Philips Semiconductors Product speciﬁcation

Versatile speech/dialler/ringer with music-on-hold

handbook, full pagewidth

∆G

(dB)

5.8

78.7 kΩ

R6 = ∞

110 kΩ 140 kΩ

TEA1069; TEA1069A

MGD490

I (mA)

140120100806040200

line

Fig.9 Variation of gain as function of line current with R6 as parameter.

Table 1 Values of resistor R6 for optimum line-loss compensation at various values of exchange supply voltage

) and exchange feeding bridge resistance (R

exch

); R9 = 20 Ω

exch

R6 (kΩ)

(V)

exch

= 400 Ω R

exch

= 600 Ω R

exch

= 800 Ω R

exch

= 1000 Ω

36 100 78.7 −− 48 140 110 93.1 82 60 −−120 102

1998 Jan 08 12

Philips Semiconductors Product speciﬁcation

Versatile speech/dialler/ringer with music-on-hold

SIDETONE SUPPRESSION Suppression of the transmitted signal in the earpiece is

obtained by the anti-sidetone network comprising R1//Z R2, R3, R8, R9 and Z

(see Fig.10). The maximum

bal

compensation is obtained when the following conditions are fulfilled:

R9 R2× R1 R3 R8+()×=

kR3

bal

R8 R9+()

×=

----------------------------R2 R9×()

×=

line

The scale factor k is chosen to meet the compatibility with a standard capacitor from the E6 or E12 series for Z In practice, Z length. Therefore, the value chosen for Z

varies considerably with the line type and

line

should be for

bal

an average line length thus giving optimum setting for short or long lines.

Example: the balance impedance Z

at which the

bal

optimum suppression is present can be calculated as

line

(1)

(2)

(3)

TEA1069; TEA1069A

follows: suppose Z 5 km line of 0.5 mm diameter, copper, twisted-pair cable

matched to 600 Ω (176 Ω/km; 38 nF/km). When k = 0.64 then R8 = 390 Ω; Z

= 130 Ω + (820 Ω//220 nF).

bal

The anti-sidetone network for the TEA1069 and TEA1069A shown in Fig.10 attenuates the signal received from the line by 32 dB before it enters the receiving amplifier. The attenuation is almost constant over the whole audio-frequency range. Figure 11 shows a conventional Wheatstone bridge anti-sidetone circuit that can be used as an alternative. Both bridge types can be used with either resistive or complex set impedances. More information on the balancing of anti-sidetone bridges can be found in our publication

Wired telecom systems, IC03b”

9397 750 00811.

= 210 Ω + (1265 Ω//140 nF) representing a

line

“Applications Handbook for

, order number

handbook, full pagewidth

line

R1 R2

SLPE

bal

MSA500 - 1

Fig.10 Equivalent circuit of TEA1069 and TEA1069A anti-sidetone bridge.

1998 Jan 08 13

Philips Semiconductors Product speciﬁcation

Versatile speech/dialler/ringer with music-on-hold

handbook, full pagewidth

line

Fig.11 Equivalent circuit of an anti-sidetone network in a Wheatstone bridge configuration.

Dialler and ringer part

UPPLY VOLTAGE: PINS VDDAND V

The power supply must be maintained for data storage. The RAM retention voltage (standby supply voltage) may drop down to 1.0 V. Applying a large capacitor across the supply terminals can retain the memory if power connections are broken. The minimum operation voltage is

2.5 V. The internal power-on reset is enabled for a voltage below this minimum operation voltage.

SCILLATOR INPUT/OUTPUT: PINS XTAL1AND XTAL2

Time base for the TEA1069 and TEA1069A is a crystal-controlled on-chip oscillator which is completed by connecting a 3.579545 MHz crystal or ceramic resonator between XTAL1 and XTAL2. The oscillator starts when VDD reaches the operation voltage level and CE/FDI = HIGH. The following types of ceramic resonators are recommended:

• Kyocera PBRC3.58ARPC10 (wired)

• Kyocera KBR3.58MSATRPC10 (SMD)

• Murata CSA3.58MG310VA (wired).

ESET INPUT: PIN RESET

Pin RESET is an input to the internal reset circuit. When RESET = HIGH, it can be used to initialize the TEA1069 and TEA1069A which is normally done by the CE/FDI input. The on-chip power-on reset generates a reset pulse if VDD drops below 2.5 V. In this event a proper start-up

TEA1069; TEA1069A

bal

SLPE

occurs after the supply voltage rises above the minimum operation voltage level again. During and directly after reset pins 14 to 19, 21, 29 to 32, 34 and 35 are set HIGH; pins 8, 20, 22, 26 to 28 and 33 are set to LOW.

The RESET pin can be connected to V resistor of 100 kΩ to 1 MΩ, which will save leakage current. A capacitor connected to VDD can be used to extend the reset time, in case a longer reset is desirable.

To prevent the dialler from reacting on voltage disturbances on the telephone line a time-out is active. The dialler returns to standby state if the voltage on the line has disappeared for more than this reset-delay time (trd).

HIP ENABLE/FREQUENCY DISCRIMINATOR INPUT:

PIN CE/FDI

This active HIGH input is used to initialize part of the system, to select the on-line, standby, or ringer mode and to detect line power breaks. To keep the TEA1069 and TEA1069A in the on-line mode, CE/FDI has to be HIGH.

In the exchange, several AC signals can be superimposed on the DC signal, e.g. dialling tone, busy tone, disturbances (like line power breaks), and the ringer signal. The ringer signal is evaluated, and checked if its frequency is within the limits of the frequency interval as set by the diode option RFS. It is assumed that the ringer frequency at pin CE/FDI is the double of the frequency present on the telephone line.

MSA501 - 1

, preferably via a

1998 Jan 08 14

+ 30 hidden pages