MT88L70AS

The MT88L70AS from Zarlink Semiconductor Inc is a complete 3 Volt, DTMF receiver that integrates both the bandsplit filter and digital decoder functions. It is designed for operation with a supply voltage ranging from 2.7V to 3.6V, making it suitable for low-voltage applications.

The device features a low power consumption and includes an internal gain setting amplifier and adjustable guard time. The filter section utilizes switched capacitor techniques, while the decoder employs digital counting techniques to detect and decode all 16 DTMF tone-pairs into a 4-bit code. External component count is minimized by on-chip provision of a differential input amplifier, clock oscillator, and latched three-state bus interface.

This DTMF receiver is housed in an 18-pin SOIC package and is designed for surface mount (SMD/SMT) applications. It operates within a temperature range of -40°C to +85°C, ensuring reliable performance in various environmental conditions.

Key specifications include a typical operating voltage of 3V, a minimum operating voltage of 2.7V, and a maximum operating voltage of 3.6V. The typical operating current is 2mA, and the power dissipation is 500mW. A clock frequency of 3.58MHz is utilized. The MT88L70AS is functionally compatible with Mitel's MT8870D.