Description
The T7507 device is a single-chip, four-channel A-law PCM codec with filters. This integrated circuit provides analog-to-digital and digital-to-analog conversion. It provides the transmit and receive filtering necessary to interface a voice telephone circuit to a time-division multiplexed system. This device is packaged in a 44-pin PLCC.

FEATUREs
■ 5 V only
■ Low-power, latch-up-free CMOS technology:
   — 37 mW/channel typical operating power dissipation
   — 1 mW/channel typical powerdown dissipation
■ Fixed master clock frequency: 2.048 MHz
■ On-chip sample and hold, autozero, and precision voltage reference
■ Differential architecture for high noise immunity and power supply rejection
■ PCM interface:
   — Fixed 2.048 MHz data rate
   — Delayed and nondelayed PCM modes
   — Fully flexible time-slot assignment
   — Transmit and receive aligned or offset
■ Transmit PCM data output enable
■ Serial control interface with controlling processor
■ Latched parallel control interface with SLIC and switch
■ Meets or exceeds D3/D4 (as per Lucent PUB 43801) and ITU-T G.711—G.714 requirements
■ Operating temperature range: –40 °C to +85 °C
■ A-law companding
■ Hybrid balance and termination impedance:
   — 200 Ω in series with 680 Ω || 0.1 µF (People’s Republic of China ZT)
   — Matched with L8567 SLIC
■ Programmable receive gain (–3.5 dB or –7 dB), fixed transmit gain (0 dB) when matched with L8567 SLIC
■ 44-pin PLCC