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5.22 Schematic of receiver circuit with 4-bit binary output

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Table 5.3 DTMF Output

Signal frequency, Hz

Decimal Binary Low High

1 0001 697 1209
2 0010 697 1336
3 0011 697 1477
4 0100 770 1209
5 0101 770 1336
6 0110 770 1477
7 0111 852 1209
8 1000 852 1336
9 1001 852 1477
0 1010 941 1336
* 1011 941 1209
# 1100 941 1477
A 1101 697 1633
B 1110 770 1633
C 1111 852 1633
D 0000 941 1633

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