Intersil CD22202
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. | CD22202 |
|---|---|
| Datasheet | CD22202 Download |
| Manufacturer |  Intersil |
| Description | 5V Low Power DTMF Receiver |
| Buy | Stock & Price |
FEATURES
● Central Office Quality● No Front End Band Splitting Filters Required
● Single, Low Tolerance, 5V Supply
● Detects Either 12 or 16 Standard DTMF Digits
● Uses Inexpensive 3.579545MHz Crystal for Reference
● Excellent Speech Immunity
● Output in Either 4-Bit Hexadecimal Code or Binary Coded 2-of-8
● Synchronous or Handshake Interface
● Three-State Outputs
● Excellent Latch-Up Immunity
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.
