Midian Electronics TTD-5 Quick Start Manual

TTD-5
Single Digit DTMF Decoder
Manual Revision: 2007-01-23
Covers Hardware Revision:
TTD-5: C & Higher

SPECIFICATIONS

Operating Voltage
Operating Current
Operating Temperature
Input Level
Outputs
Dimensions

GENERAL INFORMATION

The TTD-5 is a single digit DTMF decoder with 16
outputs. Each output corresponds to each of the 16
DTMF digits (0-9,*, #, A-D). The outputs can be
either momentary or latched and only one output
can be active at any given time.

HARDWARE INSTALLATION

Be certain to follow standard anti-static procedures
when handling any of Midian's products.
Connector P1
P1-2 – Red – VIN +5.5-18 VDC – Connect to
switched battery point in the radio. Connect to a
regulated voltage point in a vehicular radio if engine
noise is present on the battery line. Keep this lead
as short as possible.
P1-4 – Black – Ground – Connect to the nearest
ground plane in the radio.
P1-6 – Orange – Tone Input – Connect to an audio
point in the receiver, usually the high side of the
volume control or discriminator output. When using
CTCSS, pick up the audio after the high pass filter.
P1-7 – Yellow – Output Tone #
5.5-18 VDC
7 mA
-30 - +60 C
25-500 mV RMS
200 mA
1.35" L x 0.85" W x 0.3" H
P1-8 – Green/White – Output Tone *
P1-9 – White – Output Tone A
P1-10 – Gray/White – Output Tone B
P1-11 – Gray – Output Tone C
P1-12 – Orange/White – Output Tone D
Connector P2
P2-4 – Black – Output Tone 0
P2-5 – Blue – Output Tone 9
P2-6 – Orange – Output Tone 8
P2-7 – Yellow – Output Tone 7
P2-8 – Green/White – Output Tone 6
P2-9 – White – Output Tone 5
P2-10 – Gray/White – Output Tone 4
P2-11 – Gray – Output Tone 3
P2-12 – Orange/White – Output Tone 2
P2-13 – Violet – Output Tone 1

HARDWARE ALIGNMENT

Note: The TTD-5 has a time constant of 300 msec
to prevent falsing on voice talkoff. It is possible to
shorten this time constant by replacing C2 with a
smaller value capacitor or increase the time constant
by replacing C2 with a larger value capacitor.

PRODUCT PROGRAMMING

The TTD-5 is a hardware based product and no
programming is required.
Momentary Output: With JU1 installed the outputs
give a momentary output. The voltage on IC1 Pin 15
(present only with a DTMF input) is passed through
JU1 to the common, pin 3 of IC-2 and IC-3. Because
voltage is only present when receiving DTMF the
selected output will be low only as long as DTMF is
1

OPERATION