= HF8V = / = SP8WJT = / = SP0106RZ =
HF-17380
PROJECT: HF-17380
DESCRIPTION: 16 Channel DTMF decoders MIKROTEL SP0204_4 (16xMT8870)
BRAND: MIROTEL
STATUS: u
PROJECT START DATE: near 2018
LOCALISATION: DD
DOCUMENTATION:
PCB: TPD57380
DIMENSIONS: 247 x 40 mm
VERSION: 1.00
HF-17380
I made some basic tests with this module. One XTAL 3.579 MHz is used to clock all 16 MT8870 decoders.
Components:
| IC | COUNT | DESCRIPTION | REMARKS |
|---|
| MT8870 | 16 | DTMF decoder | |
| 74HC541 | 2 | OCTAL BUFFER/LINE DRIVER | interfacing MT8870 decoded outputs |
| 74HC04 | 2 | 6 Inverters | between 74138 outputs and MT8870 TOE input (enable) |
| 74HC138 | 1 | Demux | choosing channel (pair of 2 MT8870 decoders) |
| 7805 | 1 | Regulator +5V | |
Similiar module with MT8888 DTMF tranceivers was catalogued as HF-17828
Sources:
[1] MT8870 Datasheet
[2] Interface MT8870 DTMF Decoder Module with Arduino
Prefix 17
HF Register
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