Order this document from Analog Marketing ! PROGRAMMABLE TELEPHONE LINE INTERFACE CIRCUIT WITH LOUDSPEAKER AMPLIFIER The MC34216 is developed for use in telephone applications where besides the standard telephone functions also the group listening–in feature is required. In cooperation with a microcontroller, the circuit performs all basic telephone functions including DTMF generation and pulse dialing. The listening–in part includes a loudspeaker amplifier, an anti–howling circuit and a strong supply. In combination with the TCA3385, the ringing is performed via the loudspeaker. SEMICONDUCTOR TECHNICAL DATA FEATURES Line Driver and Supply • DC and AC Termination of the Line • • • • 28 1 Selectable Masks: France, U.K., Low Voltage Current Protection DW SUFFIX PLASTIC PACKAGE CASE 751F Adjustable Set Impedance for Resistive and Complex Termination Efficient Supply Point for Loudspeaker Amplifier and Peripherals Handset Operation • Transmit and Receive Amplifiers • • • • • • Adjustable Sidetone Network Microphone and Earpiece Mute Earpiece Gain Increase Switch Microphone Squelch Function Transmit Amplifier Soft Clipping Dialing and Ringing • Generates DTMF, Pilot Tones and Ring Signal • • • • • AHO1 1 AHO2 2 MTF 3 4 26 RXO1 25 RXI AGnd 5 24 LPI TXI 6 23 LPO Mic 7 22 Gnd 8 LAI HYN 10 NDC 11 21 VCC 20 Iref 19 RS 18 Clk CM 12 17 D/HS IMP 13 SAO 14 16 Osc Low Current While Pulse–Dialing Optimized for Ringing via Loudspeaker Programmable Ring Melodies Uses Inexpensive 500 kHz Resonator Peak–to–Peak Limiter Prevents Distortion LAO 9 15 SAI Programmable Volume (Top View) Anti–Howling Circuitry for Group Listening–In Interfacing for Handsfree Conversation Application Areas • Corded Telephony with Group Listening–In • • • 28 AGC 27 RXO2 MTC Interrupter Driver for Pulse–Dialing Loudspeaking Facility • Integrated Loudspeaker Amplifier • • • • PIN CONNECTIONS Line Length AGC Cordless Telephony Base Station with Group Listening–In Telephones with Answering Machines Fax, Intercom, Modem This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice. MOTOROLA ANALOG IC DEVICE DATA ORDERING INFORMATION Device Tested Operating Temperature Range Package MC34216DW TA = 0° to +70°C SO–28L Motorola, Inc. 1995 1 MC34216 PIN FUNCTION DESCRIPTION 2 Pin Symbol Description 1 AHO1 Anti–Howling Timing, Speakerphone Input 2 AHO2 Anti–Howling Timing, Low Voltage Line Driver Disable 3 MTF Microphone Threshold Filtering 4 MTC Microphone Threshold Timing 5 AGnd Small Signal Ground 6 TXI Microphone Amplifier Input 7 Mic Microphone Bias Current Sink 8 LAO Line Driver Amplifier Output 9 LAI Line Driver Amplifier Input 10 HYN Hybrid Network Input Noise Decoupling 11 NDC 12 CM DC Mask Signal Filtering 13 IMP Reference Voltage 14 SAO Line Current Sense Amplifier Output 15 SAI Line Current Sense Amplifier Input 16 Osc Oscillator Input. Connect to 500 kHz Resonator 17 D/HS Data Input, Hookstatus Output 18 Clk Clock Input 19 RS Reset Output 20 Iref Reference Current 21 VCC Supply Voltage 22 Gnd Large Signal Ground 23 LPO Loudspeaker Amplifier Output 24 LPI Loudspeaker Amplifier Input 25 RXI Receive Amplifier Input 26 RXO1 Receive Amplifier Output 27 RXO2 Receive Amplifier Output 28 AGC Loudspeaker AGC Timing MOTOROLA ANALOG IC DEVICE DATA MC34216 Simplified Block Diagram Line + DC and AC Termination Handset Earpiece Handset MIcrophone DC Mask Generation AC Termination 2–4 Wire Conversion Ear Supply Stabilizer Mic Line Driver Anti– Howling Base Loudspeaker DTMF and Ring Generator LSP Microcontroller Interface Line – This device contains 6,507 active transistors. CIRCUIT DESCRIPTION The block diagram of the MC34216 (see Figure 2), shows the basic blocks of the device plus the essential external components. With the MC34216, a microcontroller and a switched mode power supply, a telephone set with listening–in function and ringing via loudspeaker can be built as shown in Figure 1. Figure 1. Telephone Concept with MC34216 Hookswitch Z1 Z0 Z21 T2 VCC A/B Handset Loudspeaker MOTOROLA ANALOG IC DEVICE DATA MC34216 R1 Micro SMPS Gnd 3 MC34216 Figure 2. Block Diagram of the MC34216 with Essential Components Line + To IMP To SAI Z1 C17 To IMP Z0 R20 C16 HYN CM 12 10 C20 NDC SAO 14 LAI 9 13 R12 Iref IMP 20 RXO1 R6 27 RXI 25 C5 TXI DC Mask Generation AC Termination 2–4 Wire Conversion Line Length AGC Protection Ear Mute, AGC Supply– Stabilizer References Ring– Regulator MC34216 Line Driver Mic Anti Howling Microphone Threshold Volume LPO 23 C7 LAO 8 T3 RS DTMF/Tone and Ring Generator LSP R30 LPI Micro– Interface Clock Hook–Detect 19 Clk 18 D/HS To Micro– controller 17 24 R28 5 Gnd 22 Mic 7 21 AGnd Mute, AGC 6 C24 T2 VCC 26 RXO2 R9 11 Z21 C12 28 AGC C21 1 AHO1 2 C26 AHO2 3 C27 MTF C28 4 MTC SAI 15 C29 16 Osc R1 X1 C25 To IMP Line – Table 1 A1, A0 Data Symbol 00 D0 D1 D2 D3 D4 D5 MicM EM LD PT IT MicP Microphone Mute Earphone Mute Loop Disconnect Pilot Tone Idle Tone Microphone Power On/Off On/Off For Pulse–Dialing On/Off On/Off On/Off 01 D0 D1 MFC0 MFC1 Tone Control Tone Control Switch On/Off DTMF & Tone Generator D2 D3 D4 D5 MF0 MF1 MF2 MF3 Tone Select Tone Select Tone Select Tone Select Select DTMF & Tone Frequency D0 R/S Ring/Speech Mode Select D1 EA Earphone Gain +6.0 dB On/Off D2 D3 D4 G0 G1 G2 Loudspeaker Gain Loudspeaker Gain Loudspeaker Gain Reduce Gain up to 27 dB in 4.5 dB Steps & Mute D5 RT Ring Tone On/Off D0 D1 DCM0 DCM1 DC Mask Control DC Mask Control Select French, U.K., or Low Voltage Mask D2 D3 D4 D5 Sp GR HPI Mth Speakerphone Mode Line Length AGC Anti–Howling Microphone Threshold On/Off On/Off On/Off On/Off 10 11 4 Function Comments MOTOROLA ANALOG IC DEVICE DATA MC34216 When off–hook, the loop current flows through transistor T2 and supplies the externals (microcontroller, etc.) at VCC which is stabilized by the MC34216. The V–I line characteristic is programmed by the microcontroller and adjusted by the external components Z0, Z1, Z21 and R1 which are in a regulator loop, acting on transistor T2. The ac impedance is generated in a similar way. The handset and loudspeaker can be connected directly to the MC34216 to perform handset and listening–in operation. Via the bus, the microcontroller programs the MC34216 to perform the DTMF/pulse–dialing and provide supervisory tones, as well as control other functions. The user keypad has to be connected to the microcontroller. When on–hook, the SMPS (TCA3385) supplies the circuit in the presence of a ringing signal. The microcontroller programs the MC34216 and a ringing melody can be generated via the loudspeaker. A summary of the control bits which can be programmed from the microcontroller are in Table 1. OUTLINE DIMENSIONS DW SUFFIX PLASTIC PACKAGE CASE 751F–04 ISSUE E -A28 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.13 (0.005) TOTAL IN EXCESS OF D DIMENSION AT MAXIMUM MATERIAL CONDITION. 15 14X -B1 P 0.010 (0.25) M B M 14 28X D 0.010 (0.25) M T A S B M S R X 45° C -T26X -T- G K SEATING PLANE F J DIM A B C D F G J K M P R MILLIMETERS MIN MAX 17.80 18.05 7.60 7.40 2.65 2.35 0.49 0.35 0.90 0.41 1.27 BSC 0.32 0.23 0.29 0.13 8° 0° 10.05 10.55 0.25 0.75 INCHES MIN MAX 0.701 0.711 0.292 0.299 0.093 0.104 0.014 0.019 0.016 0.035 0.050 BSC 0.009 0.013 0.005 0.011 0° 8° 0.395 0.415 0.010 0.029 Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters can and do vary in different applications. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. 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Box 20912; Phoenix, Arizona 85036. 1–800–441–2447 JAPAN: Nippon Motorola Ltd.; Tatsumi–SPD–JLDC, Toshikatsu Otsuki, 6F Seibu–Butsuryu–Center, 3–14–2 Tatsumi Koto–Ku, Tokyo 135, Japan. 03–3521–8315 MFAX: [email protected] – TOUCHTONE (602) 244–6609 INTERNET: http://Design–NET.com HONG KONG: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298 ◊ MOTOROLA ANALOG IC DEVICE DATA *MC34216/D* MC34216/D5