■ DESCRIPTION

The FUJITSU MB86434 is an AIU (audio interface unit) LSI for +5 V single-power source digital telephone devices, manufactured using CMOS process technology. The codec transmission filter characteristics meet G.712 standards, and can handle input and output in A-Law, μ-Law and linear conversion modes. The MB86434 also contains the necessary DTMF, microphone and receiver amps for telephone devices.

■ FEATURES

? +5 V single power supply

? Low power consumption: muting settings for each operating mode

Normal operation : 8.2 mA typ (speaker amp mute)

Tone generation : 1.8 mA typ (speaker amp mute)

Standby mode : 0.5 mA typ

? On-chip codec filter meets G.712 standards

? Selection of codec conversion methods (A-law, μ-law, linear)

? On-chip low-noise microphone amp (2-channel) (unity gain frequency: 1MHz)

? On-chip receiver speaker amps (32 ?BTL type: 10 mW MIN)

? On-chip tone speaker amp (32 ?BTL type: 200 mW MIN)

? On-chip earphone speaker amps (32 ? single type: 5 mW MIN)

? On-chip electronic volume gain adjustments (sending, receiving, tone)

? On-chip accessory output circuits

? DTMF generator function

? Service tone generation

? CMOS compatible input/output