MT8870D
Integrated DTMF Receiver with Enhance Sensitivity
Overview
| The MT8870 is a complete DTMF receiver integrating both the bandsplit filter and digital decoder functions. 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 on chip provision of a differential input amplifier, clock oscillator and latched three-state bus interface. |
Detailed Block Diagram
Typical Applications
- Receiver system for British Telecom (BT) or CEPT Spec (MT8870D-1)
- Paging systems
- Repeater systems/mobile radio
- Credit card systems
- Remote control
- Personal computers
- Telephone answering machine
Features & Benefits
- Complete DTMF Receiver
- Low power consumption
- Internal gain setting amplifier
- Adjustable guard time
- Central office quality
- Power-down mode
- Inhibit mode
- Backward compatible with MT8870C/MT8870C-1
Resources
Documentation
Application Notes
- ZLAN-219 - Power Down and Delayed Steering Output (STD) Detail for MT8870D.pdf
- MSAN-108 - Applications of the MT8870 Integrated DTMF Receiver.pdf
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Ordering
Pb Free Integrated Dtmf Rcvr 20 Ssop 5.3Mm Tube Rohs Compliant: Yes |Microchip MT8870DN1
| Distributor | SKU | Stock | MOQ | Pkg | |
|---|---|---|---|---|---|
| Microchip Technology Inc. | .. | .. | .. | .. | Buy Now |
| DigiKey | MT8870DN1-ND | .. | Tube | No Stock | |
| Mouser | 494-MT8870DN1 | 1 | Tube | No Stock |
Pb Free Integrated Dtmf Rcvr 20 Ssop 5.3Mm T/R Rohs Compliant: Yes |Microchip MT8870DNR1
| Distributor | SKU | Stock | MOQ | Pkg | |
|---|---|---|---|---|---|
| Microchip Technology Inc. | .. | .. | .. | .. | Buy Now |
| DigiKey | MT8870DNR1-ND | .. | Tape & Reel | No Stock | |
| Mouser | 494-MT8870DNR1 | 276 | 1 | Tape & Reel | Buy Now |
MT8870 Series 5 V 3.579545 Mhz 500 mW Integrated DTMF Receiver - SOIC-18
| Distributor | SKU | Stock | MOQ | Pkg | |
|---|---|---|---|---|---|
| Microchip Technology Inc. | .. | .. | .. | .. | Buy Now |
| DigiKey | MT8870DS1-ND | .. | Tube | No Stock | |
| Mouser | 494-MT8870DS1 | 3,344 | 1 | Tube | Buy Now |
MT8870 Series 5 V 3.579545 Mhz 500 mW Integrated DTMF Receiver - SOIC-18
| Distributor | SKU | Stock | MOQ | Pkg | |
|---|---|---|---|---|---|
| Microchip Technology Inc. | .. | .. | .. | .. | Buy Now |
| Arrow Electronics | MT8870DSR1 | 928 | 1 | Cut Tape | Buy Now |
| DigiKey | MT8870DSR1CT-ND | 624 | 1 | Cut Tape | Buy Now |
| DigiKey | MT8870DSR1TR-ND | 12,000 | 1000 | Tape & Reel | Buy Now |
| Mouser | 494-MT8870DSR1 | 11,099 | 1 | Tape & Reel | Buy Now |
