MC34118P Freescale Semiconductor, MC34118P Datasheet

MC34118P

Manufacturer Part Number

MC34118P

Description

Manufacturer

Freescale Semiconductor

Datasheet

1.MC34118P.pdf (22 pages)

Specifications of MC34118P

Operating Supply Voltage (typ)

Max Transmitter Gain

8dB

Receiver Gain (max)

8dB

Operating Temp Range

-20C to 60C

Package Type

PDIP

Pin Count

Operating Current

5.5mA

Operating Temperature Classification

Commercial

Mounting

Through Hole

Operating Supply Voltage (max)

6.5V

Operating Supply Voltage (min)

3.5V

Lead Free Status / Rohs Status

Not Compliant

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ARCHIVED - 6/2010

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

Voice Switched

Speakerphone Circuit

Silicon Monolithic Integrated Circuit

necessary amplifiers, attenuators, level detectors, and control algorithm to form

the heart of a high quality hands--free speakerphone system. Included are a

microphone amplifier with adjustable gain and MUTE control, Transmit and

Receive attenuators which operate in a complementary manner, level detectors

at both input and output of both attenuators, and background noise monitors for

both the transmit and receive channels. A Dial Tone Detector prevents the dial

tone from being attenuated by the Receive background noise monitor circuit.

Also included are two line driver amplifiers which can be used to form a hybrid

network in conjunction with an external coupling transformer. A high--pass filter

can be used to filter out 60 Hz noise in the receive channel, or for other filtering

functions. A Chip Disable pin permits powering down the entire circuit to

conserve power on long loops where loop current is at a minimum.

from the telephone line, requiring typically 5.0 mA. The MC34118 can be

interfaced directly to Tip and Ring (through a coupling transformer) for

stand--alone operation, or it can be used in conjunction with a handset speech

network and/or other features of a featurephone.

• Improved Attenuator Gain Range: 52 dB Between Transmit and Receive

• Low Voltage Operation for Line--Powered Applications (3.0 -- 6.5 V)

• 4--Point Signal Sensing for Improved Sensitivity

• Background Noise Monitors for Both Transmit and Receive Paths

• Microphone Amplifier Gain Set by External Resistors — Mute Function

• Chip Disable for Active/Standby Operation

• On Board Filter Pinned--Out for User Defined Function

• Dial Tone Detector to Inhibit Receive Idle Mode During Dial Tone Presence

• Standard 28--Pin Plastic DIP Package and SOIC Package Available

• Compatible with MC34119 Speaker Amplifier

• Motorola now offers Pb--free packages with suffix code EG

REV 1

10/03

MOTOROLA

CONTROL

VOLUME

The MC34118 Voice Switched Speakerphone Circuit incorporates the

The MC34118 may be operated from a power supply, or it can be powered

Motorola, Inc. 2003

Included

MIKE

SPEAKER

MUTE

NOISE MONITOR

BACKGROUND

POWER AMP

(EXTERNAL)

DETECTORS

LEVEL

SIMPLIFIED BLOCK DIAGRAM

AGC

ATTENUATOR

CONTROL

DETECTORS

DETECTOR

DIAL TONE

LEVEL

NOISE MONITOR

BACKGROUND

FILTER

BIAS

--1.0

CHIP

DISABLE

RING

TIP

MC34118DW/EG/R2 T

(Pin assignments same for both packages)

MC34118P

Device

ORDERING INFORMATION

HTO+

HTO--

MCO

MUT

MC34118

TXO

VLC

MCI

HTI

PIN CONNECTIONS

TXI

(Top View)

Temperature

Operating

= --20° to +60°C

Range

PLASTIC PACKAGE

Order this document

EG (Pb- -free)

DW SUFFIX

CASE 751F

28--SOICW

CASE 710

P SUFFIX

28--PDIP

SUFFIX

by MC34118/D

GND

CPR

RLI1

RLO1

TLO1

TLI1

RXO

RXI

RLI2

RLO2

TLO2

TLI2

CPT

Package

MC34118

28 SOICW

28 PDIP

Related parts for MC34118P

MC34118P Summary of contents

Page 1

... MCI 11 18 MUT 12 17 VLC (Pin assignments same for both packages) ORDERING INFORMATION Operating TIP Temperature Device Range MC34118DW/EG/ --20° to +60°C A MC34118P RING V CC CHIP DISABLE by MC34118/D GND CPR RLI1 RLO1 TLO1 TLI1 RXO RXI RLI2 RLO2 TLO2 TLI2 CPT V B ...

Page 2

ABSOLUTE MAXIMUM RATINGS Parameter Supply Voltage (Pin 4) Voltage at CD (Pin 3), MUT (Pin 12) Voltage at VLC (Pin 13) Voltage at TXI (Pin 9), RXI (Pin 21), FI (Pin 2) Storage Temperature Range Devices should not be operated ...

Page 3

ELECTRICAL CHARACTERISTICS (T Parameter ATTENUATORS (continued 25°C) A Transmit Attenuator Gain (f = 1.0 kHz) Tx Mode, TXI = 150 mVrms Idle Mode, TXI = 150 mVrms Range ( Mode) TXO DC Voltage (Tx Mode) ...

Page 4

Parameter LEVEL DETECTORS AND BACKGROUND NOISE MONITORS Transmit--Receive Switching Threshold (Ratio of Current at RLI1 + RLI2 to 20 µA at TLI1 + TLI2 to switch from Tx to Rx) Source Current at RLO1, RLO2, TLO1, TLO2 Sink Current at ...

Page 5

Pin Name Description 1 FO Filter output. Output impedance is less than 50 ohms Filter input. Input impedance is greater than 1.0 Mohm Chip Disable. A logic low (< 0.8 V) sets normal operation. A logic ...

Page 6

MC34118 6 Figure 2. MC34118 Block Diagram MOTOROLA ...

Page 7

INTRODUCTION The fundamental difference between the operation of a speakerphone and a handset is that of half--duplex versus full--duplex. The handset is full duplex since conversation can occur in both directions (transmit and receive) simulta- neously. A speakerphone has higher ...

Page 8

RLI1 (TLI2 5.1 k SIGNAL INPUT 0.1 µF 0.1 µF SIGNAL INPUT 5 TLI1 + V B (RLI2) speaker amplifier. On the transmit side, one level detector (TLI2 the output of the ...

Page 9

By disabling the receive idle mode, the dial tone remains at the normally expected full level. ...

Page 10

To switch to idle quickly (fast idle), the current sources are turned off, and the internal 2.0 kΩ resistor is switched in, discharging the capacitor 2 — To switch to ...

Page 11

With an appropriate choice of an input coupling capacitor to the low pass filter, a band pass filter is formed. 4.0 k 220 3 0.001 ...

Page 12

0.1 µ 0.1 µF 120 1.0 kHz (RLO1, RLO2 TLO1, TLO2 INPUT ...

Page 13

CD ≤ 1.0 2.0 3.0 4.0 V (VOLTS) CC Figure 18. Supply Current versus Supply Voltage 220 µ 300 1.0K FREQUENCY (Hz) Figure 20. ...

Page 14

DESIGN GUIDELINES SWITCHING TIME The switching time of the MC34118 circuit is dominated by the components at C (Pin 14, refer to Figure 6), and sec- T ondarily by the capacitors at the level detector outputs (RLO1, RLO2, TLO1, TLO2). ...

Page 15

MOTOROLA + + Figure 23. MC34118 Application Circuit (Basic Line Powered Speakerphone MC34118 15 ...

Page 16

MIKE V M AMP TLI2 -- + ACOUSTIC ( COUPLING + -- RLI2 SPEAKER AMP. Figure 24. Basic Block Diagram for Design Purposes amplified as soon as possible ...

Page 17

V/V gain terms. The speaker amplifier gain is divided by two since G ferential gain of the amplifier, and V 3 side of that output. The current I , coming from the ...

Page 18

dB. Experience has shown, however, that AC--MAX an acoustic coupling loss of > desirable. — The M line helps define the maximum sidetone cou- TX pling (G ) allowed in the system, which ...

Page 19

The circuit is powered entirely by the telephone line’s loop current, and its charac- teristics are shown in Figures 8.0 4 LOOP CURRENT (mA) ...

Page 20

Ring, through the microphone wiring to the microphone am- plifier, or through any of the PC board traces. The most sen- sitive pins on the MC34118 are the inputs to the level detectors (RLI1, RLI2, TLI1, TLI2) since, when there ...

Page 21

PIN 1 IDENT e B 0.025 MOTOROLA PACKAGE DIMENSIONS P SUFFIX PLASTIC PACKAGE CASE 710- -02 ISSUE B 28 PDIP ...

Page 22

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 ...

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