MS8870

Features:

• Complete DTMF receiver
• Low power consumption
• Adjustable guard time
• Central Office Quality
• CMOS, Single 5V operation


Pinout




Specifications

	Parameter	Min	Max	Units
1	Power supply voltage VDD-Vss		6	V
2	Voltage on any pin	Vss - 0.3	VDD + 0.3	V
3	Current at any pin		10	mA
4	Operating temperature	-40	+85
5	Storage temperature	-65	+150
6	Package power dissipation		1000	mW

Description

The MS8870 is a complete DTMF receiver integrating both the bandsplit filter and digital decoder functions, fabricated in double poly technology and is pin and function compatible with MITEL8870. The filter section uses switched capacitor techniques for high and low group filters; the decoder uses digital counting techniques to detect and decode all 16 DTMF tone-pairs into a 4-bit code.

External component count is minimized by MS8870 on chip provision of a differential input amplifier, clock oscillator and latched 3-state bus interface.