CD2281CP, CD22859, CD2295NL Selling Leads, Datasheet
MFG:CS Package Cooled:DIP16 D/C:07+
CD2281CP, CD22859, CD2295NL Datasheet download
Part Number: CD2281CP
MFG: CS
Package Cooled: DIP16
D/C: 07+
CD2281CP, CD22859, CD2295NL
- Table of contents:
Info of CD2281CP
Info of CD22859
Info of CD2295NL
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About CD2003GB
PDF/DataSheet Download
Datasheet: CD2003GB
File Size: 199565 KB
Manufacturer: 无锡华润华晶微电子有限公司
Download : Click here to Download
About CD22859
PDF/DataSheet Download
Datasheet: CD22859
File Size: 39796 KB
Manufacturer: INTERSIL [Intersil Corporation]
Download : Click here to Download
About CD2003GB
PDF/DataSheet Download
Datasheet: CD2003GB
File Size: 199565 KB
Manufacturer: 无锡华润华晶微电子有限公司
Download : Click here to Download
CD22859 General Description
The CD22859 is a CMOS dual-tone multifrequency (DTMF) tone generator for use in dual-tone telephone dialing systems. The device can easily be interfaced to a standard push-button telephone keyboard to provide enabling operation directly with the telephone lines.
The CD22859 generates standard DTMF sinusoidal dialing tones from an on-chip reference crystal oscillator. The reference oscillator uses an inexpensive 3.579545MHz color TV crystal to create highly stable and accurate tones. The sinusoidal tones are digitally synthesized by a stair-step approximation.
One of four low-frequency band row tones and one of four high-frequency band column tones are selected by driving one of the four row inputs and one of the four column inputs low. Simultaneous selection of more than one row input and/or more than one column input will inhibit tone generation, or generate a single-tone sinusoid. These operating modes are described in the functional truth table.
Control logic is included to allow easy interface to standard K500-type telephones. Two CMOS outputs (TX, RX) capable of driving external pnp receiver and transmitter muting transistors are provided. A low input to the CD pin inhibits tone generation, turns off the reference oscillator and causes TX and RX outputs to go to logic '0'. During tone generation mode, CD = 1 and TX, RX = logic 1.
The row, column and CD inputs are provided with pull-up resistors to allow the use of SPST switch matrixes.
The CD22859 generates standard DTMF sinusoidal dialing tones from an on-chip reference crystal oscillator. The reference oscillator uses an inexpensive 3.579545MHz color TV crystal to create highly stable and accurate tones. The sinusoidal tones are digitally synthesized by a stair-step approximation.
One of four low-frequency band row tones and one of four high-frequency band column tones are selected by driving one of the four row inputs and one of the four column inputs low. Simultaneous selection of more than one row input and/or more than one column input will inhibit tone generation, or generate a single-tone sinusoid. These operating modes are described in the functional truth table.
Control logic is included to allow easy interface to standard K500-type telephones. Two CMOS outputs (TX, RX) capable of driving external pnp receiver and transmitter muting transistors are provided. A low input to the CD pin inhibits tone generation, turns off the reference oscillator and causes TX and RX outputs to go to logic '0'. During tone generation mode, CD = 1 and TX, RX = logic 1.
The row, column and CD inputs are provided with pull-up resistors to allow the use of SPST switch matrixes.
CD22859 Maximum Ratings
Supply Voltage (VDD - VSS). . . . . . . . . . . . . . . . . . . . . . . -0.5 to 12V
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . .. -0.5V to VDD 0.5V
Power Dissipation, PD
TA = -40 to 60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .500mW
TA = 60 to 85 . . . . . . . Derate Linearly at 1.2mW/ to 200mW
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . .. -0.5V to VDD 0.5V
Power Dissipation, PD
TA = -40 to 60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .500mW
TA = 60 to 85 . . . . . . . Derate Linearly at 1.2mW/ to 200mW
CD22859 Features
• Mute Drivers On-Chip
• Device Power can Either be Regulated DC or Telephone Loop Current
• Use of an Inexpensive 3.579545MHz TV Crystal Provides High Accuracy and Stability for all Frequencies
• Device Power can Either be Regulated DC or Telephone Loop Current
• Use of an Inexpensive 3.579545MHz TV Crystal Provides High Accuracy and Stability for all Frequencies
CD22859 Typical Application
• For Use In Dual-tone Telephone Dialing Systems
CD22859 Connection Diagram
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