Ordering number: EN4431A CMOS LSI LC73861, LC73862 DTMF Receiver LSI Overview Package Dimensions unit : mm The LC73861 and LC73862 are DTMF signal detector receiver that incorporates all the necessary filters for telephone answering machines. 3001B-DIP8 [LC73861, LC73862] Features . 16-DTMF tone signal decoder . DTMF receiver with all necessary filters built-in . Dial tone filter . High-group bandpass filter . Low-group bandpass filter . Extended range . Serial datadynamic output . Microcontroller guard-time compatible . 4.5 to 5.5 V operating supply voltage range SANYO : DIP8 Specifications Absolute Maximum Ratings at Ta = 25°C, VSS = 0 V Parameter Symbol Conditions Ratings Unit Maximum supply voltage VDD max –0.3 to +6.0 Maximum input voltage VIN max –0.3 to VDD +0.3 Maximum input current IIN max –10 to +10 Maximum output voltage Allowable power dissipation VOUT max Pd max V V mA –0.3 to VDD +0.3 Ta % 85°C V 500 mW Operating temperature Topr –40 to +85 °C Storage temperature Tstg –50 to +125 °C Allowable Operating Conditions at Ta = –40°C to +85°C, VSS = 0 V Parameter Operating supply voltage High-level input voltage Low-level input voltage Symbol VDD VIH VIL Conditions ACK pin ACK pin min 4.5 0.7VDD typ max 5.5 0.3VDD Unit V V V DC Electrical Characteristics at Ta = 25°C ± 2°C, VDD = 5 V, VSS = 0 V Parameter Operating supply current High-level output current Low-level output current Input impedance Symbol IDD(op) IOH IOL Zin Conditions VOUT = 4.6 V, SD and EST pins VOUT = 0.4 V, SD and EST pins INPUT pin min typ 3 max 7 –0.4 1 10 Unit mA mA mA kΩ SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN 93097HA(II)/90793JN B8-0375 No.4431-1/5 LC73861, LC73862 AC Electrical Characteristics at Ta = 25°C ± 2°C, VDD = 5 V, VSS = 0 V, fOSC = 4.194304 MHz Parameter Valid input signal level Positive twist accept Frequency deviation accept Frequency deviation reject Third tone tolerance Dial tone tolerance Noise tolerance Tone present detect time Tone absent detect time Data shift rate Data output delay time Setup time delay Data hold time Symbol tDP tDA tPAD tDL tDH Oscillator frequency fOSC Load capacitance CXO See See See See See See See See See Conditions notes 1, 2, 3, 5, 6 and 9. notes 2, 3, 4, 9 and 11. notes 2, 3, 5 and 9. notes 2, 3 and 5. notes 2, 3, 4, 5, 9 and 10. notes 2, 3, 4, 5, 8, 9 and 10. notes 2, 3, 4, 5, 7, 9 and 10. Timing Chart. Timing Chart. See Timing Chart. See Timing Chart. See Timing Chart. LC73861 LC73862 OSCI and OSCO min –49.5 typ max 0 6 ±1.5% ±2 ±3.5 –16 22 –12 3 0.5 20 20 1 100 0 30 4.190109 4.194304 4.198498 3.5759 3.5795 3.5831 30 Unit dBm dB Hz % dB dB dB ms ms MHz ns ns ns MHz MHz pF Notes 1. 0 dBm = 1 mW power when driving a 600 Ω load. 2. All 16 DTMF signal frequencies. 3. 40 ms DTMF signal period and 40 ms pause period. 4. Nominal DTMF frequency. 5. Low-frequency group and High-frequency group signal levels are the same. 6. DTMF signal frequency deviation is within ±1.5% ±2 Hz. 7. Bandwidth limited (0 to 3 kHz) Gaussian noise. 8. 350 Hz and 440 Hz dial tone frequencies. 9. Error rate of less than 1 in 10,000. 10. Referenced to the lowest frequency component of the DTMF signal. 11. Twist = High-frequency group tone level ÷ Low-frequency group tone level. Pin Assignment Top view Pin Description Number Name I/O Description 1 INPUT I Input coupling capacitor required. Biased internally to VDD/2. 2 OSCO O 3 OSCI I An oscillating circuit is formed by connecting a 4.194304 MHz (LC73861) / 3.579545 MHz (LC73826) oscillator and a capacitor (if needed) between these pins. (To determine whether an external capacitor is needed or not, contact the manufacturer of the oscillator.) 4 VSS Supply pin, normally 0 V 5 SD O Outputs 4-bit serial decoded DTMF output, least significant bit first. 6 ACK I The ACK pin is used to shift out data to the SD pin. Four pulses are needed in order to shift out the 4-bit DTMF code. The data is latched by the shift register before the rising edge of the first pulse. 7 EST O Indicates the presence of a DTMF signal when HIGH. (This pin can be monitored and after a short delay, data can be accessed by 4 pulses to ACK.) 8 VDD O Supply pin, normally 4.5 V to 5.5 V No.4431-2/5 LC73861, LC73862 Output Code Table DTMF Dialing Matrix FL FH KEY b3 b2 b1 b0 697 1209 1 L 697 1336 2 L L L H L H 697 1477 3 L L L H H 770 1209 770 1336 4 L H L L 5 L H L H 770 852 1477 6 L H H L 1209 7 L H H H 852 1336 8 H L L L 852 1477 9 H L L H 941 1336 0 H L H L H 941 1209 H L H 941 1477 # H H L L 697 1633 A H H L H 770 1633 B H H H L 852 1633 C H H H H 941 1633 D L L L L Timing Chart No.4431-3/5 LC73861, LC73862 Equivalent Block Diagram Frequency detector Low-frequency group bandpass filter Frequency detector Dial-tone filter Timing generator Code converter and latch Anti-aliasing filter High-frequency group bandpass filter Signal discriminator Bias generator Output signal control circuit Shift register Test Circuit / Sample Application Circuit No.4431-4/5 LC73861, LC73862 No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. Anyone purchasing any products described or contained herein for an above-mentioned use shall: 1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: 2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of September, 1997. Specifications and information herein are subject to change without notice. No.4431-5/5