MV8865 Datasheet (Plessey)

MV8865, DTMF FILTER

1 FL Low group limiter output.

2 FLT Test output.

Monitors low group filter output.

Decouple to Vss with 680pF capacitor.

3 NC Not connected.

4 INPUT Tone signal input (single ended).

5 n V

MV8865 MV8865 DTMFFILTER The MV8865 contains both the high group and low group filtering and comparator functions required to implement a Dual Tone Multi Frequency tone receiver using a DTMF Digital Detector (Le.

MV8860/62/63).

Switched capacitor techniques are used to implement the filters and the deviceJs fabricated using Plessey Semiconductors' high density ISO/CMOS technology.

The filter clocks are derived from an on-chip oscillator requiring only a low cost TV crystal as an external compo

MV8865 Features

* Provides DTMF High and Low Group Filtering

* Hard Limiting on Filter Outputs

* 6 Pole Band Pass High and Low Group Filters

* 38dB Intergroup Attenuation

* Dial Tone Suppression

* +5 to +12 V Siflgle Supply Operation

* Logical Power Down