■ 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 ΩBTL type: 10 mW MIN)

• On-chip tone speaker amp (32 ΩBTL type: 200 mW MIN)

• On-chip earphone speaker amps (32 Ω 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