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TEA1098AH Datasheet - Philips

TEA1098AH Datasheet PDF Philips Electronics

Part Name
TEA1098AH

Other PDF
  not available.

PDF

page
40 Pages

File Size
185 kB

MFG CO.
Philips
Philips Electronics GO URL

GENERAL DESCRIPTION
The TEA1098A is an analog bipolar circuit dedicated for telephony applications. It includes a line interface, handset (HS) microphone and earpiece amplifiers, handsfree (HF) microphone and loudspeaker amplifiers and a duplex controller with signal and noise monitors on both channels. Digital volume control is available both on earphone and loudspeaker amplifiers.

FEATURES
Line interface
• Low DC line voltage
• Voltage regulator with adjustable DC voltage
• Symmetrical high impedance inputs (70 kΩ) 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 (4 steps)
• Automatic Gain Control (AGC) for true line loss compensation
• Microphone mute
• Key tone mode.

Supplies
• Provides a strong 3.35 V regulated supply for microcontroller or dialler
• Provides filtered power supply, optimized according to line current
• Filtered 2.0 V power supply output for electret microphone
• PD logic input for power-down.

Handsfree
• 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 (8 steps)
• Duplex controller consisting of:
– Signal and noise envelope monitors for both channels (with adjustable sensitivities and timing)
– Decision logic (with adjustable switch-over and Idle mode timing)
– Voice switch control (with adjustable switching range and constant sum of gain during switching).

APPLICATIONS
• Line powered telephone sets.

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