TEA1064BT datasheet(8/32 Pages) PHILIPS

Numer części	TEA1064BT

Szczegółowy opis	Low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting

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Producent	PHILIPS [NXP Semiconductors]

Strona internetowa	http://www.nxp.com

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8 / 32 page

March 1994

8

Philips Semiconductors

Product speciﬁcation

Low voltage versatile telephone transmission circuit

with dialler interface and transmit level dynamic limiting

TEA1064B

The maximum AC output swing on the line at low currents

is influenced by R16 (limited by current) and the maximum

output swing on the line at high currents is influenced by

DC voltage VLN-SLPE (limited by voltage). In both these

situations, the internal dynamic limiter in the sending

channel prevents distortion when the microphone is

overdriven. The maximum AC output swing on LN is

shown in Fig.7; practical values for R16 are from 200

Ω to

600

Ω and this influences both maximum output swing at

low line currents and the supply capabilities.

When the SLPE pin is the reference for peripheral circuits,

inputs MUTE, PD and DTMF must be referenced to SLPE.

This is achieved by connecting pin VEE2 to pin SLPE; VEE2

being the reference of MUTE, PD and DTMF input stages.

Active microphones can be supplied between VCC and

VEE1 as shown in Fig.5. Low power circuits that provide

MUTE, PD and DTMF inputs to the TEA1064B can also be

powered from VCC (see Fig.6 for the supply capability of

Fig.6

Maximum current Ip with respect to Fig.5

available from Vcc for peripheral circuitry

with VCC > 2.2 V.

(a) Ip = 1.94 mA

(b) Ip = 1.54 mA

(a

′) Ip = 0.54 mA

(b

′)Ip = 0.16 mA

Iline =15mA

R1 = 620

Ω and R9 = 20 Ω

Curve (a) and (a

′) are valid when the receiving

amplifier is not driven or when MUTE = HIGH.

Curve (b) and (b

′) are valid when the receiving

amplifier is driven and when MUTE = LOW.

Vo(RMS) = 150 mV, RT = 150 Ω.

handbook, halfpage

012

4

2.4

0

0.8

1.6

MBA434

3

VCC (V)

Ip

(mA)

(a)

(b)

(a')

(b')

VCC). MUTE, PD and DTMF are then referenced to VEE1

and the pin VEE2 must therefore be connected to VEE1.

If the line current Iline exceeds ICC + 0.25 mA, the voltage

converter shunts the excess current to SLPE via LN;

where ICC ≈ 1.3 mA, the value required by the IC for

normal operation.

The DC line voltage on LN is:

• VLN = VLN-SLPE + (ISLPE x R9)

• VLN = Vref + ({Iline − ICC − 0.25 x 10−3 A} x R9)

in which:

• Vref = 3.23 V ± 0.25 V is the internal reference voltage

between LN and SLPE; its value can be adjusted by

external resistor RVA.

• R9 = external resistor between SLPE and VEE1 (20 Ω in

basic operation).

With R9 = 20

Ω, this results in:

• VLN = 3.3 ± 0.25 V at Iline = 15 mA

• VLN = 4.1 ± 0.3 V at Iline = 15 mA, RVA(REG-SLPE) = 33 kΩ

• VLN = 4.4 ± 0.35 V at Iline = 15mA,

RVA(REG- SLPE) = 20 kΩ

The preferred value for R9 is 20

Ω. Changing R9

influences microphone gain, DTMF gain, the gain control

characteristics, sidetone and the DC characteristics

(especially the low voltage characteristics).

In normal conditions, ISLPE >> (ICC + 0.25 mA) and the

static behaviour is equivalent to a voltage regulator diode

with an internal resistance of R9. In the audio frequency

range the dynamic impedance is determined mainly by R1.

The equivalent impedance of the circuit in audio frequency

range is shown in Fig.8.

The internal reference voltage VLN-SLPE can be increased

by external resistor RVA(REG-SLPE) connected between

REG and SLPE. The voltage VLN-SLPE is shown as a

function of RVA(REG-SLPE) in Fig.9. Changing the reference

voltage influences the output swing of both sending and

receiving amplifiers.

At line currents below 8 mA (typ.), the DC voltage dropped

across the circuit is adjusted to a lower level automatically

(approximately 1.8 V at 2 mA). This gives the possibility of

operating more telephone sets in parallel with DC line

voltages (excluding polarity guard) down to an absolute

minimum of 1.8 V. At line currents below 8 mA (typ.), the

circuit has limited sending and receiving levels.

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