╔════════════════════════ ═══════════════════ ═══════════════════╗ ║ Iron. ║ ╙─────────────────────────────── ───────────────────────────────╜ (R) Klim Gromov DECODER FOR AUTOMATIC NUMBER IDENTIFICATION DN-01. -1- GENERAL DESCRIPTION The DN-01 chip performs operations related to analysis signals coming from the telephone line, for example, decryption of op- Dividing the subscriber number. Designed for use in stationary equipment for automatic phone number identification nenta (Caller ID) and for high-end telephone sets. Completed on CMOS technology. -2- DESCRIPTION OF THE WORK. For the operation of analog nodes, a voltage is generated inside the IC artificial midpoint Uagnd= +2.5V (AGND pin). For reducing the level of interference in the analog components of the microcircuit between the AGND-GND and +5BGND waters of the microcircuit must be connected to the ceramic microfilter capacitors with a capacity of at least 0.47 µF. In addition, for the product to operate you must: a) Apply a clock signal to the CLC pin withfrequency 32.768 kHz and tolerance -0.1% and +0.5% (duty factor no more than 4); b) Between pins 13 and 21, connect a resistor R=24 Kom. For To control the operation of the microcircuit, an external controller is required. When working with single-chip computers 18ZOVECH8/51 (8048/8051) control The general conclusions of the latter and the corresponding conclusions of the product can be connected are connected directly (no additional elements are required) cops). -3- OPERATING MODE OF THE PRODUCT. Determined by controller control signals. Generator - In this mode, a caller ID request signal is generated or signal for simulating the operation of an automatic telephone exchange. Caller ID - Signals transmitted by PBX equipment are decoded communication line. Line - used when analyzing the state of the line (long line dock, hang up, pause) to organize the automatic redial mode on and/or when accessing a long-distance telephone exchange. Standby - Used to electronically turn off the chip (by controller command). Management of the operation of the IS is carried out by recording in it input register of a 4-bit word D0-D3 (when a signal is given for - pee oninput /WR). -3.1.- FORMAT OF WORD, CONTROL. D3-Enable the 'STANDBY' mode 0-off. 1-on D2-Mode selection 0-mode 'Caller ID' 1-mode 'LINE' D1-Select the frequency of the generated signal 0-5OOHz 1-42SHz. D0-Enable generator 0-off. 1-on In response (when a read signal is applied to the /RD input), the microcircuit outputs gives (to the D0-D3 bus) two 4-bit words containing information tion about the reliability of the decoded information (flags FLЗ-FLO) and NK itself (K3-K0). -4- STRUCTURE DN-01. DN-01 contains the following main components: 1. harmonic signal generator; 2. open-loop input operational amplifier; 3. AGC circuit (AGC) with a regulating transistor; 4. ANI filter channels formed by bandpass filters with average frequencies F=700,900,1100,1300,1500 and 1700 Hz and child- ctors; 5. Unit for selecting two maximum amplitude signals; 6.comparators that measure the levels of the selected maximum sig- catch; 7. auxiliary filter channel formed by a low-pass filter with a frequency cutoff F=6OOHz and detector used in recognition PBX response signals; 8. NC change detector (CCD); 9. node for switching the operating mode of the microcircuit - “Caller ID” or “LINE” (MODE); 10.electronic power shutdown unit; 11.clock pulse generator. In the next issue of our newspaper I will continue the description of the microphone DN-01 circuit diagram, namely an overview of the operation of the microcircuit by mode: Generator; AGC; Caller ID; LINE; WAITING, as well as the electrical parameters of this microcircuit.
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