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CD22203 Datasheet(PDF) 5 Page - Intersil Corporation |
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CD22203 Datasheet(HTML) 5 Page - Intersil Corporation |
5 / 6 page 5 CD22202, CD22203 into the audio spectrum, so if excessive noise is present above 28kHz, the simple RC filter shown below may be used to band limit the incoming signal. The cut off frequency is 3.9kHz. FIGURE 4. FILTER FOR USE IN EXTREME HIGH FREQUENCY INPUT NOISE ENVIRONMENT Noise will also be reduced by placing a grounded trace around XIN and XOUT pins on the circuit board layout when using a crystal. It is important to note that XOUT is not intended to drive an additional device. XIN may be driven externally; in this case, leave XOUT floating. Timing Waveforms FIGURE 5. CD22202 CD22203 33k Ω 0.0015 µF 270k Ω ANALOG IN NOISY SIGNAL tON tOFF PAUSE ANALOG INPUT D1, D2 D4, D8 TONE BURST 1 TONE BURST 2 tD tR tSU tH tCL tPW tER tED CLRDV DV ED NOTE: Early Detect output is available only on the CD22203. (NOTE) Guard Time Whenever the DTMF receiver is continually monitoring a voice channel containing distorted or musical voices or tones, additional guard time may be added in order to prevent false decoding. This may be done in software by verifying that both ED and DV are present simultaneously for about 55ms. An appropriate guard time should be selected to balance the fastest expected dialing speed against the rejection of distorted or musical voices or tones (most autodialers operate in the 65ms to 75ms range although a few generate 50ms tones). A hardware guard time circuit is shown in Figure 6. R3 and R4 should keep the voice amplitude as low as practical, while R2 and R5 adjust detection speed. PARAMETER SYMBOL MIN TYP MAX UNITS Tone Time For Detection tON 40 - - ms For Rejection tON -- 20 ms Pause Time For Detection tOFF 40 - - ms For Rejection tOFF -- 20 ms Detect Time tD 25 - 46 ms Release Time tR 35 50 ms Data Setup Time tSU 7- - µs Data Hold Time tH 4.2 - 5 ms DV Clear Time tCL - 160 250 ns CLRDV Pulse Width tPW 200 - - ns ED Detect Time tED 7- 22 ms ED Release Time tER 2- 18 ms Output Enable Time CL = 50pF, RL = 1kΩ - - 200 300 ns Output Disable Time CL = 35pF, RL = 500Ω - - 150 200 ns Output Rise Time CL = 50pF - - 200 300 ns Output Fall Time CL = 50pF - - 160 250 ns |
Similar Part No. - CD22203 |
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Similar Description - CD22203 |
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