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CD22202 データシート(PDF) 4 Page - Intersil Corporation |
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CD22202 データシート(HTML) 4 Page - Intersil Corporation |
4 / 6 page 4 CD22202, CD22203 FIGURE 2. CRYSTAL OSCILLATOR HEX/B28 This pin selects the format of the digital output code. When HEX/B28 is tied high, the output is hexadecimal. When tied low, the output is binary coded 2-of-8. The following table describes the two output codes. ED This pin, on the CD22203 only, indicates the presence of fre- quencies which are likely to be DTMF digits, but have not yet been verified by a DV signal. It is comparable to a “button- down” output, and it is useful as an EARLY DETECT signal to interrupt a microprocessor for digit storage and validation. DV and CLRDV DV signals a detection by going high after a valid tone pair is sensed and decoded at the output pins D1, D2, D4, and D8. DV remains high until a valid pause occurs or CLRDV is raised high, whichever is sooner. This handshake can save microprocessor time. DTMF Dialing Matrix IN1633 When tied high, this pin inhibits detection of tone pairs con- taining the 1633Hz component. For detection of all 16 stan- dard digits, IN1633 must be tied low. N/C Pin This pin has no internal connection and should be left floating. Digital Inputs and Outputs All digital inputs and outputs of the DTMF receivers are rep- resented by the schematic below. Only the “analog in” pin is different, and is described above. Care must be exercised not to exceed the voltage or current ratings on these pins as listed in the “maximum ratings” section. FIGURE 3. DIGITAL INPUTS AND OUTPUTS Input Filter The CD22202 and CD22203 will tolerate total input noise of a maximum of 12dB below the lowest amplitude tone. For most telephone applications, the combination of the high frequency attenuation of the telephone line and internal band limiting make special circuitry at the input to these receivers unnecessary. However, noise near the 56kHz internal sampling frequency will be aliased (folded back) TABLE 1. OUTPUT CODES DIGIT HEXADECIMAL BINARY CODED 2-OF-8 D8 D4 D2 D1 D8 D4 D2 D1 1 0 00 10 00 0 2 0 01 00 00 1 3 0 01 10 01 0 4 0 10 00 10 0 5 0 10 10 10 1 6 0 11 00 11 0 7 0 11 11 00 0 8 1 00 01 00 1 9 1 00 11 01 0 0 1 01 01 10 1 * 1 01 11 10 0 # 1 10 01 11 0 A 1 10 10 01 1 B 1 11 00 11 1 C 1 11 11 01 1 D 0 00 01 11 1 XEN XEN CD22202/22203 12 11 8 13 ATB XIN 3.579545MHz VDD XOUT 1M 12 13 8 XIN CONNECTED TO VDD UP TO 10 DEVICES CD22202/22203 COL 0 1209Hz COL 1 1336Hz COL 2 1477Hz COL 3 1633Hz ROW 0 697Hz ROW 1 770Hz ROW 2 852Hz ROW 3 941Hz NOTE: Column 3 is for special applications and is not normally used in telephone dialing. 1 2 3 A 4 5 6 B 7 8 9 C * 0 # D VDD VSS CMOS DIGITAL CIRCUITRY DIGITAL OUTPUT DIGITAL INPUT |
同様の部品番号 - CD22202 |
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同様の説明 - CD22202 |
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