ChongMing Group (HK) Int'l Co., Ltd
CHONGMING GROUP (HK) INT'L CO., LTD.
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Features
• 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
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
Description
The MT8870D/MT8870D-1 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 tonepairs 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.
STOCK LIST
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| 30616* | 926 | BOSCH | 10+ | QFP-64 |
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| LTC1485IS8 | 15538 | LINEAR | 16+ | SOP |
| PIC16F648A-I/SO | 5103 | MICROCHIP | 14+ | SOP |
| LM2940SX-5.0 | 10000 | NSC | 15+ | TO-263 |
| LP38693MPX-ADJ | 4277 | NSC | 15+ | SOT-223 |