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TEA1098 Datasheet - Philips

TEA1098 Datasheet PDF Philips Electronics

Part Name
TEA1098

Other PDF
  not available.

PDF

page
40 Pages

File Size
200.2 kB

MFG CO.
Philips
Philips Electronics GO URL

GENERAL DESCRIPTION
The TEA1098 is an analog bipolar circuit dedicated to 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.

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
• Receive amplifier for dynamic, magnetic or piezo-electric earpieces (with externally adjustable gain)
• Automatic Gain Control (AGC) for true line loss compensation.

Supplies
• Provides a strong 3.35 V regulated supply for microcontrollers or diallers
• 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
• Logarithmic volume control on loudspeaker amplifier via linear potentiometer
• 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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