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MC34216
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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.
PROGRAMMABLE TELEPHONE LINE INTERFACE CIRCUIT WITH LOUDSPEAKER AMPLIFIER
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 Adjustable Set Impedance for Resistive and Complex Termination Efficient Supply Point for Loudspeaker Amplifier and Peripherals
DW SUFFIX PLASTIC PACKAGE CASE 751F
Handset Operation * Transmit and Receive Amplifiers Adjustable Sidetone Network Line Length AGC Microphone and Earpiece Mute Earpiece Gain Increase Switch Microphone Squelch Function Transmit Amplifier Soft Clipping
AHO1 AHO2 MTF MTC AGnd TXI Mic LAO 1 2 3 4 5 6 7 8 9 28 AGC 27 RXO2 26 RXO1 25 RXI 24 LPI 23 LPO 22 Gnd 21 VCC 20 Iref 19 RS 18 Clk 17 D/HS 16 Osc 15 SAI (Top View)
PIN CONNECTIONS
Dialing and Ringing * Generates DTMF, Pilot Tones and Ring Signal Interrupter Driver for Pulse-Dialing Low Current While Pulse-Dialing Optimized for Ringing via Loudspeaker Programmable Ring Melodies Uses Inexpensive 500 kHz Resonator
LAI HYN 10 NDC 11 CM 12 IMP 13 SAO 14
Loudspeaking Facility * Integrated Loudspeaker Amplifier Peak-to-Peak Limiter Prevents Distortion Programmable Volume Anti-Howling Circuitry for Group Listening-In Interfacing for Handsfree Conversation
Application Areas * Corded Telephony with Group Listening-In Cordless Telephony Base Station with Group Listening-In Telephones with Answering Machines Fax, Intercom, Modem
Device
ORDERING INFORMATION
Tested Operating Temperature Range TA = 0 to +70C Package SO-28L
MC34216DW
This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice.
(c) Motorola, Inc. 1995
MOTOROLA ANALOG IC DEVICE DATA
1
MC34216
PIN FUNCTION DESCRIPTION
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Symbol AHO1 AHO2 MTF MTC AGnd TXI Mic LAO LAI HYN NDC CM IMP SAO SAI Osc D/HS Clk RS Iref VCC Gnd LPO LPI RXI RXO1 RXO2 AGC Description Anti-Howling Timing, Speakerphone Input Anti-Howling Timing, Low Voltage Line Driver Disable Microphone Threshold Filtering Microphone Threshold Timing Small Signal Ground Microphone Amplifier Input Microphone Bias Current Sink Line Driver Amplifier Output Line Driver Amplifier Input Hybrid Network Input Noise Decoupling DC Mask Signal Filtering Reference Voltage Line Current Sense Amplifier Output Line Current Sense Amplifier Input Oscillator Input. Connect to 500 kHz Resonator Data Input, Hookstatus Output Clock Input Reset Output Reference Current Supply Voltage Large Signal Ground Loudspeaker Amplifier Output Loudspeaker Amplifier Input Receive Amplifier Input Receive Amplifier Output Receive Amplifier Output Loudspeaker AGC Timing
2
MOTOROLA ANALOG IC DEVICE DATA
MC34216
Simplified Block Diagram
Line + DC and AC Termination
Handset Earpiece Handset MIcrophone
Ear
DC Mask Generation AC Termination 2-4 Wire Conversion
Supply Stabilizer
Mic
Line Driver Anti- Howling
Base Loudspeaker
LSP
DTMF and Ring Generator
Microcontroller Interface
Line - This device contains 6,507 active transistors.
CIRCUIT DESCRIPTION
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. The block diagram of the MC34216 (see Figure 2), shows the basic blocks of the device plus the essential external components.
Figure 1. Telephone Concept with MC34216
Hookswitch
Z1 Z21 A/B
Z0
T2 VCC
Handset
MC34216
Micro
SMPS
Loudspeaker
R1
Gnd
MOTOROLA ANALOG IC DEVICE DATA
3
MC34216
Figure 2. Block Diagram of the MC34216 with Essential Components
Line + To IMP To SAI Z1 C17 To IMP C20 RXO1 26 RXO2 R6 27 RXI 25 C5 TXI 6 Mic Mic C24 7 LPO 23 R30 LPI 24 R28 C21 Line - 28 AGC C25 To IMP 1 AHO1 2 C26 AHO2 3 C27 MTF C28 4 MTC SAI 15 C29 16 Osc X1 Volume LSP Anti Howling Microphone Threshold DTMF/Tone and Ring Generator Micro- Interface Clock Hook-Detect Ear Mute, AGC Mute, AGC MC34216 Line Driver LAO 8 RS 19 Clk 18 D/HS 17 R1 To Micro- controller T3 DC Mask Generation AC Termination 2-4 Wire Conversion Line Length AGC Protection Supply- Stabilizer References Ring- Regulator R20 HYN 10 12 C16 CM 11 C12 Z21 LAI 9 13 IMP 20 Z0 R12 Iref VCC 21 AGnd 5 Gnd 22 C7
NDC SAO 14
T2
R9
Table 1
A1, A0 00 Data D0 D1 D2 D3 D4 D5 D0 D1 D2 D3 D4 D5 10 D0 D1 D2 D3 D4 D5 11 D0 D1 D2 D3 D4 D5 Symbol MicM EM LD PT IT MicP MFC0 MFC1 MF0 MF1 MF2 MF3 R/S EA G0 G1 G2 RT DCM0 DCM1 Sp GR HPI Mth Function Microphone Mute Earphone Mute Loop Disconnect Pilot Tone Idle Tone Microphone Power Tone Control Tone Control Tone Select Tone Select Tone Select Tone Select Ring/Speech Mode Earphone Gain +6.0 dB Loudspeaker Gain Loudspeaker Gain Loudspeaker Gain Ring Tone DC Mask Control DC Mask Control Speakerphone Mode Line Length AGC Anti-Howling Microphone Threshold On/Off On/Off For Pulse-Dialing On/Off On/Off On/Off Switch On/Off DTMF & Tone Generator Select DTMF & Tone Frequency Comments
01
Select On/Off Reduce Gain up to 27 dB in 4.5 dB Steps & Mute
On/Off Select French, U.K., or Low Voltage Mask On/Off On/Off On/Off On/Off
4
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 15 14X
-B1 14
P 0.010 (0.25)
M
B
M
28X D
0.010 (0.25)
M
TA
S
B
S
M R X 45
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. 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
-T26X
C G K -TSEATING PLANE
F J
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. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer.
How to reach us: USA / EUROPE: Motorola Literature Distribution; P.O. Box 20912; Phoenix, Arizona 85036. 1-800-441-2447 MFAX: RMFAX0@email.sps.mot.com - TOUCHTONE (602) 244-6609 INTERNET: http://Design-NET.com
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 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/D 5

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