HT9170D Holtek, HT9170D Datasheet

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HT9170D

Manufacturer Part Number
HT9170D
Description
DTMF receiver
Manufacturer
Holtek
Datasheet

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Features
·
·
·
·
·
General Description
The HT9170 series are Dual Tone Multi Fre-
quency (DTMF) receivers integrated with digi-
tal decoder and bandsplit filter functions. The
HT9170B and HT9170D types 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
Selection Table
Part No.
HT9170B
HT9170D
Function Operating
Operating voltage: 2.5V~5.5V
Minimal external components
No external filter is required
Low standby current (on power down mode)
Excellent performance
2.5V~5.5V
2.5V~5.5V
Voltage
Frequency
3.58MHz
3.58MHz
OSC
Data Output
Tristate
Ö
Ö
1
·
·
·
·
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.
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
Power
Down
Ö
Ö
DTMF Receiver
1633Hz
Inhibit
Ö
Ö
DV DVB Package
Ö
Ö
HT9170
December 20, 1999
¾
¾
18 DIP
18 SOP

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HT9170D Summary of contents

Page 1

... The HT9170 series are Dual Tone Multi Fre- quency (DTMF) receivers integrated with digi- tal decoder and bandsplit filter functions. The HT9170B and HT9170D types 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 ...

Page 2

Block Diagram Pin Assignment 2 December 20, 1999 HT9170 ...

Page 3

Pin Description Internal Pin Name I/O Connection OPERATIONAL VP I Operational amplifier non-inverting input AMPLIFIER VN I Operational amplifier inverting input GS O Operational amplifier output terminal VREF O VREF Reference voltage output, normally The system oscillator ...

Page 4

Approximate internal connection circuits Absolute Maximum Ratings Supply Voltage.................................-0. Input Voltage .................V -0. Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maxi- mum Ratings² may cause substantial damage to the ...

Page 5

Symbol Parameter Source Current I OH (D0~D3, EST, DV) Sink Current I OL (D0~D3, EST, DV) f System Frequency OSC A.C. Characteristics Symbol Parameter DTMF Signal Input Signal Level Twist Accept Limit (Positive) Twist Accept Limit (Negative) Dial Tone Tolerance ...

Page 6

Symbol Parameter R Load Resistance (GS Load Capacitance (GS Common Mode Range CM Steering Control t Tone Present Detection Time DP t Tone Absent Detection Time DA t Acceptable Tone Duration ACC t Rejected Tone Duration ...

Page 7

Functional Description Overview The HT9170 series tone decoders consist of three band pass filters and two digital decode circuits to convert a tone (DTMF) signal into digital code output. An operational amplifier is built-in to adjust the input signal (refer ...

Page 8

Timing Diagrams Figure 3. Steering timing Figure 4. Power up timing 8 December 20, 1999 HT9170 ...

Page 9

Fundamental circuit ´ C ´ GTP TRT ´ C ´ GTA DD TRT (b) t < GTP GTA ...

Page 10

DTMF data output table Low Group (Hz) High Group (Hz) 697 1209 697 1336 697 1477 770 1209 770 1336 770 1477 852 1209 852 1336 852 1477 941 1336 941 1209 941 1477 697 1633 770 1633 852 1633 ...

Page 11

Application Circuits HT9170 December 20, 1999 ...

Page 12

... Holtek reserves the right to alter its products without prior notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw. ...

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