描述 Description

The T8502 and T8503 devices are single-chip, two channel, μ-law/A-law PCM codecs with filters. These integrated circuits provide analog-to-digital and digital-to-analog conversion. They provide the transmit and receive filtering necessary to interface a voice telephone circuit to a time-division multiplexed system. These devices are packaged in both 20-pin SOJs and 20-pin SOGs.

特性 Features

■ +5 V only

■ Two independent channels

■ Pin-selectable receive gain control

■ Pin-selectable μ-law or A-law companding

■ Automatic powerdown mode

■ Low-power, latch-up-free CMOS technology

— 40 mW/channel typical operating power dissipation

— 12.5 mW/channel typical standby power dissipation

■ Automatic master clock frequency selection

— 2.048 MHz or 4.096 MHz

■ Independent transmit and receive frame strobes

■ 2.048 MHz or 4.096 MHz data rate

■ On-chip sample and hold, autozero, and precision voltage reference

■ Differential architecture for high noise immunity and power supply rejection

■ Meets or exceeds ITU-T G.711—G.714 require ments and VF characteristics of D3/D4 (as per Bellcore PUB43801)

■ Operating temperature range: –40 °C to +85 °C