Intersil CD22203
The CD22202 and CD22203 complete dual-tone multiple frequency (DTMF) receivers detect a selectable group of 12 or 16 standard digits. The only externally required components are an inexpensive 3.579545MHz TV “colorburst’’ crystal (for frequency reference) and a bias resistor. This is a monolithic integrated circuit fabricated with low-power, complementary symmetry CMOS processing.| Part No. | CD22203 |
|---|---|
| Datasheet | CD22203 Download |
| Manufacturer |  Intersil |
| Description | 5V Low Power DTMF Receiver |
| Buy | Stock & Price |
DESCRIPTION
No front-end pre-filtering is needed. Extremely high system density is possible through the use of the clock output of a crystal connected CD22202/CD22203 receiver to drive the time bases of additional receivers. It only requires a single low tolerance power supply. The CD22202 and CD22203 employ state-of-the-art circuit technology to combine the digital and analog functions on the same CMOS chip using a standard digital semiconductor process. The analog input is preprocessed by 60Hz reject and band splitting filters and then hard limited to provide AGC. Eight Bandpass filters detect the individual tones. The digital post processor times the tone durations and provides the correctly coded digital outputs. Outputs interface directly to standard CMOS circuitry and are three-state enabled to facilitate bus oriented architectures.FEATURES
● Central Office Quality● No Front End Band Splitting Filters Required
● Single, Low Tolerance, 5V Supply
● Detects Either 12 or 16 Standard DT...
