TEA1098A is a speech and handsfree integrated circuit with low DC line voltage, voltage regulator with adjustable DC voltage, symmetrical high impedance inputs for dynamic, magnetic or electret microphones, DTMF input with confidence tone on earphone and/or loudspeaker, earphone amplifier for dynamic, magnetic or piezo-electric earpieces with externally adjustable gain, digital volume control on earphone amplifier, automatic gain control (AGC) for true line loss compensation, microphone mute, key tone mode. It provides a strong 3.35 V regulated supply for microcontroller or dialler, filtered power supply optimized according to line current, filtered 2.0 V power supply output for electret microphone, PD logic input for power-down. It also features asymmetrical high input impedance for electret microphone, loudspeaker amplifier with single-ended rail-to-rail output and externally adjustable gain, dynamic limiter on loudspeaker amplifier to prevent distortion, digital volume control on loudspeaker amplifier, and duplex controller consisting of signal and noise envelope monitors, decision logic, and voice.
The Philips TEA1098A is an analog bipolar integrated circuit designed for telephony applications, specifically line-powered telephone sets. It functions as a duplex controller integrating line interface, handset microphone and earpiece amplifiers, and handsfree microphone and loudspeaker amplifiers.
The device provides a strong 3.35 V regulated supply for microcontrollers and a filtered 2.0 V supply for electret microphones. It features digital volume control for both earphone and loudspeaker amplifiers, automatic gain control for line loss compensation, and a duplex controller with adjustable signal and noise envelope monitors.
| Stabilized voltage between SLPE and GND | 3.4 - 6.5 V |
|---|---|
| Voltage gain from MIC+ to LN | 43.3 - 45.3 dB |
| Voltage gain from IR to RECO | 28.7 - 30.7 dB |
| Voltage gain range between RECO and EARO | -3 - 41.5 dB |
| Voltage gain from HFTX to LN | 33.5 - 35.9 dB |
It is dedicated for line powered telephone sets.
It provides a strong 3.35 V regulated supply for a microcontroller.
It provides a filtered 2.0 V power supply output for an electret microphone.
The preferred value for Rg-pe is 20 Q.