HT9170
DTMF Receiver
Features
·
·
·
·
·
Operating voltage: 2.5V~5.5V
Minimal external components
No external filter is required
Low standby current (on power down mode)
Excellent performance
·
·
·
·
Tristate data output for
mC
interface
3.58MHz crystal or ceramic resonator
1633Hz can be inhibited by the INH pin
HT9170B: 18-pin DIP package
HT9170D: 18-pin SOP package
General Description
The HT9170 series are Dual Tone Multi Fre-
quency (DTMF) receivers integrated with digi-
tal decoder and bandsplit filter functions. The
HT 9 170 B and HT 91 7 0 D t ypes s upply
power-down mode and inhibit mode operations.
All types of the HT9170 series use digital count-
ing techniques to detect and decode all the 16
DTMF tone pairs into a 4-bit code output.
Highly accurate switched capacitor filters are
employed to divide tone (DTMF) signals into
low and high group signals. A built-in dial tone
rejection circuit is provided to eliminate the
need for pre-filtering.
Selection Table
Function Operating
OSC
Tristate
Power 1633Hz
Voltage Frequency Data Output Down Inhibit
Part No.
HT9170B
HT9170D
2.5V~5.5V
2.5V~5.5V
3.58MHz
3.58MHz
Ö
Ö
Ö
Ö
Ö
Ö
DV DVB Package
Ö
Ö
¾
¾
18 DIP
18 SOP
1
December 20, 1999
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
