MC33215 Datasheet, PDF (1/20 Pages) Motorola, Inc – Telephone Line Interface and Speakerphone Circuit

Freescale Semiconductor, Inc._{Order this document by MC33215/D}
MC33215
Advance Information
Telephone Line Interface and
Speakerphone Circuit
The MC33215 is developed for use in fully electronic telephone sets with
speakerphone functions. The circuit performs the ac and dc line termination,
2–4 wire conversion, line length AGC and DTMF transmission. The
speakerphone part includes a half duplex controller with signal and noise
monitoring, base microphone and loudspeaker amplifiers and an efficient
supply. The circuit is designed to operate at low line currents down to 4.0 mA
enabling parallel operation with a classical telephone set.
• Highly Integrated Cost Effective Solution
• Straightforward AC and DC Parameter Adjustments
• Efficient Supply for Loudspeaker Amplifier and Peripherals
• Stabilized Supply Point for Handset Microphone
• Stabilized Supply Point for Base Microphone
• Loudspeaker Amplifier can be Powered and Used Separately
• Smooth Switch–Over from Handset to Speakerphone Operation
• Adjustable Switching Depth for Handsfree Operation
52 1
FB SUFFIX
PLASTIC PACKAGE
CASE 848B
(TQFP–52)
42
1
B SUFFIX
PLASTIC PACKAGE
CASE 858
(SDIP–42)
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
MC33215FB
MC33215B ^{TA = –20° to +70°C}
TQFP–52
SDIP–42
Simplified Application
DTMF
Handset
Microphone
Base
Microphone
V_CC or
External Supply
Base Loudspeaker
MF
HM
BM
LS
AC
Impedance
Attenuator
Duplex
Controller
Attenuator
DC Offset
Line Current
Current
Splitter
1:10
Line
Driver
V_CC Supply
DC Slope
Telephone
Line
Receive Signal
R_x
Handset Earpiece
Auxiliary Input
This device contains 2782 active transistors.
This document contains information on a new product. Specifications and information herein
© Motorola, Inc. 1997
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