TEA1096 查看數據表（PDF） - Philips Electronics

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TEA1096

Speech and listening-in IC

Philips Electronics 

Philips Semiconductors

Speech and listening-in IC

Product Specification

TEA1096; TEA1096A

The function of the current switch TR1-TR2 is to reduce

distortion of large line signals. Current ISUP is supplied to

VBB via TR1, when VSLPE is higher than VBB + 0.4 V. When

VSLPE is lower, this current is shunted to VEE via TR2. All

excess line current, not used for internal supply is

consumed in the VBB stabilizer or directly shunted to VEE.

To reduce the current consumption during pulse dialling,

the TEA1096/TEA1096A are provided with a power-down

(PD) input. The PD input has a pull-down structure. When

the voltage on PD is HIGH, the current consumption from

VDD capacitor CVDD is 100 µA and from the VBB supply

point 350 µA. The capacitors CVDD (100 µF) and CVBB

(470 µF) are sufficient to power theTEA1096/TEA1096A

during pulse dialling/flash.

VBB voltage adjustment: pin VBA (TEA1096 only)

A resistor connected between pins VBA and VEE can be

used to increase the VBB voltage, whereas a resistor

connected between pins VBA and VBB will decrease the

VBB voltage. When adjusting the VBB voltage to a higher

value, care should be taken that VSLPE is at least 0.4 V

higher than VBB (VBB supply efficiency).

Sending channel: pins MICP, MICM, DTMF, GAS, OSP,

LN, MUTE, DLS and AGC

The TEA1096/TEA1096A has symmetrical microphone

inputs MICP, MICM with an input resistance of 64 kΩ

between MICP and MICM (2 × 32 kΩ). In the speech mode

(MUTE = LOW), the overall gain from MICP-MICM to LN

can be adjusted from 33 dB to 52 dB to suit specific

requirements. The gain is proportional to the value of RGAS

and equals 52 dB with RGAS = 90.9 kΩ and Iline = 20 mA. A

capacitor CGAS connected in parallel with RGAS can be

used to provide a first-order low-pass filter.

Automatic gain control (AGC) is provided for line-loss

compensation as well as dynamic limitation for reduction

of the distortion of the transmitted signal on the line. The

microphone amplifier can be disabled by short-circuiting

pin DLS to VEE (secret function) and can be muted into

DTMF mode by applying a HIGH level on pin MUTE.

The TEA1096/TEA1096A has an asymmetrical DTMF

input with an input resistance of 20 kΩ. In the DTMF mode,

the overall gain from DTMF to LN is proportional to RGAS,

and is 26.5 dB less than the microphone amplifier gain.

Switch-over from one mode to the other is click-free.

November 1994

Fig.6 Sending channel.

9

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