MC33218ADWR2 Freescale Semiconductor, MC33218ADWR2 Datasheet - Page 27

• Manufacturer Part Number: MC33218ADWR2
• Description: IC VOICE SWITCH SPKPHONE 24-SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MC33218ADWR2

• Function: Voice-Switched Speakerphone
• Interface: SPI Serial
• Voltage - Supply: 2.7 V ~ 6.5 V
• Current - Supply: 4.6mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: *
• Includes: Chip Disable
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power (watts): -
• Number Of Circuits: -
• Other names: MC33218ADWTR

well the telephone’s AC impedance matches the line’s AC
characteristic impedance. With a perfect match, there is no
reflected signal, and therefore infinite return loss. It is
calculated from:
to a telephone. The name derives from the ring portion of the
plugs used by operators (in older equipment) to make the
connection. Ring is traditionally negative with respect to Tip.
interface port which is used to clock in data serially. The three
lines are clock, data, and a control line which enables entry of
the data. Some serial ports are bidirectional.
signal in the receive path resulting from a transmit signal
applied to the phone, and phone line.
within the CO or PBX which connects to the user’s phone
line.
line.
Suggested Vendors
Microphones
Telecom Transformers
Motorola does not endorse or warrant the suppliers referenced.
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Opportunity/Affirmative Action Employer.
Return Loss – Expressed in dB, it is a measure of how
Ring – One of the two wires connecting the central office
SPI – Serial Port Interface. A three line microprocessor
Sidetone Rejection – The rejection (in dB) of the reflected
SLIC – Subscriber Line Interface Circuit. It is the circuitry
Subscriber – The customer at the telephone end of the
RL
+
Primo Microphones Inc.
Bensenville, IL 60106
1–800–76–PRIMO
Microtran Co., Inc.
Valley Stream, NY 11528
516–561–6050
(Ask for Application Bulletin F232)
PREM Magnetics, Inc.
McHenry, IL 60050
815–385–2700
20
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Freescale Semiconductor, Inc.
For More Information On This Product,
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Go to: www.freescale.com
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MC33218A
telephone, the interconnecting wires, and the central office
equipment dedicated to that subscriber (also referred to as a
loop).
a telephone. The name derives from the tip of the plugs used
by operators (in older equipment) to make the connection.
Tip is traditionally positive with respect to Ring.
from the microphone towards the phone line (Tip and Ring).
central office to the subscriber’s telephone. Commonly
referred to as Tip and Ring, the two wires carry both transmit
and receive signals in a differential manner.
wires (on one side) – two (signal and ground) for the outgoing
signal, and two for the incoming signal. The outgoing signal is
sent out differentially on the two wire side, and incoming
differential signals received on the two wire side are directed
to the receive path of the four wire side. Additional circuit
within cancels the reflected outgoing signal to keep it
separate from the incoming signal.
used for transmission across the telephone system. Typically
it is 300–3400 Hz.
Stancor Products
Logansport, IN 46947
219–722–2244
Subscriber Line – The system consisting of the user’s
Tip – One of the two wires connecting the central office to
Transmit Path – Within the telephone it is the speech path
Two Wire Circuit – Refers to the two wires connecting the
Two–to–Four Wire Converter – A circuit which has four
Voiceband – That portion of the audio frequency range
are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal
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