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Motorola Electronic Components Datasheet

MC33218A Datasheet

VOICE SWITCHED SPEAKERPHONE

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Advance Information
Voice Switched Speakerphone
with Microprocessor Interface
The Motorola MC33218A Voice Switched Speakerphone Circuit
incorporates the 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 mute,
transmit and receive attenuators, a background monitoring system for both
the transmit and receive paths, and level detectors for each path. An AGC
system reduces the receive gain on long lines where loop current and power
are in short supply. A dial tone detector prevents fading of dial tone. A Chip
Disable pin permits conserving power when the circuit is not in use.
Additionally, the MC33218A has a serial data port which permits
microprocessor control of the receive volume level, microphone mute,
attenuator range, and selection of transmit, receive, idle or normal modes.
The data port can be operated at up to 1.0 MHz.
The MC33218A can be operated from a power supply, or from the
telephone line, requiring typically 4.6 mA. It can be used in conjunction with a
variety of speech networks. Applications include not only speakerphones,
but intercoms and other voice switched devices.
Supply Voltage Range: 2.7 to 6.5 V
Attenuator Range: 53 or 27 dB (Selectable)
2 Point Sensing with Background Noise Monitor in Each Path
Microprocessor Port for Control of:
Volume Control (40 dB Range over 16 Levels)
Mute Microphone Amplifier
Force to Receive, Transmit, or Idle Modes
Attenuator Range Selection (27 or 53 dB)
Chip Disable Pin Powers Down the Entire IC
24 Pin Narrow Body (300 mil) DIP and 24 Pin SOIC
Simplified Block Diagram
Microphone
VB
Tx Attenuator
Transmit
Out
Receive
VB In
BNM Attenuator Control
VB
CLK
DATA
POR
DR
CD
VCC
VB
Serial
Port
Reg.
DTD
Rx Attenuator
MC33218A
BNM
VB
Speaker
Speaker Amplifier
This device contains 610 active transistors.
MC33218A
VOICE SWITCHED
SPEAKERPHONE WITH
µPROCESSOR INTERFACE
SEMICONDUCTOR
TECHNICAL DATA
24
1
P SUFFIX
PLASTIC PACKAGE
CASE 724
24
1
DW SUFFIX
PLASTIC PACKAGE
CASE 751E
PIN CONNECTIONS
CP2 1
XDI 2
CPT 3
TLI 4
TLO 5
VB 6
CT 7
CD 8
NC 9
CPR 10
RLI 11
RLO 12
24 VCC
23 TAO
22 MCO
21 MCI
20 POR
19 DR
18 DATA
17 CLK
16 RXI
15 RXO
14 RAO
13 GND
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range Package
MC33218ADW
SO–24L
MC33218AP TA = – 40° to +85°C Plastic DIP
This document contains information on a new product. Specifications and information herein are
subject to change without notice.
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1995
1


Motorola Electronic Components Datasheet

MC33218A Datasheet

VOICE SWITCHED SPEAKERPHONE

No Preview Available !

MC33218A
MAXIMUM RATINGS
Rating
Symbol Min Max Unit
Supply Voltage
VCC –0.5 7.0 Vdc
Any Input
Vin –0.4 VCC + 0.4 Vdc
Maximum Junction Temperature
TJ
+150
°C
Storage Temperature Range
Tstg –65
+150
°C
NOTE: Devices should not be operated at or outside these values. The “Recommended Operating Limits”
provide for actual device operation.
RECOMMENDED OPERATING LIMITS
Characteristic
Supply Voltage (Non–AGC Range)
(AGC Range)
Maximum Attenuator Input Signal
Logic Input Voltage (Pins 8, 17–19)
Low
High
Clock and Data Rate (Serial Port)
VB Output Current
Operating Ambient Temperature Range
Symbol
VCC
Vin(max)
VINL
FDATA
IVB
TA
Min Typ
3.5 –
2.7 –
––
0–
2.0 –
0–
– See
Figure 14
–40 –
ELECTRICAL CHARACTERISTICS (TA = + 25°C, VCC = 5.0 V, CD 0.8 V, unless noted, see Figure 3.)
Characteristic
Symbol Min Typ
POWER SUPPLY
Supply Current (Enabled, CD 0.8, VB Open, See Figure 13)
Idle Mode
Tx Mode
Rx Mode
ICCE
3.0 4.6
– 4.6
– 5.3
Supply Current (Disabled, CD = 2.0 V, VB Open)
VCC = 3.0 V
VCC = 5.0 V
VCC = 6.5 V
ICCD
– 67
50 110
– 150
VB Output Voltage (IVB = 0, CD = 0)
VCC = 2.7 V
VCC = 5.0 V
VCC = 6.5 V
VB
– 0.9
2.1 2.2
– 3.0
VB Output Resistance (IVB –1.0 mA)
PSRR @ VB versus VCC, f = 1.0 KHz, CVB = 100 µF
ROVB
PSRR
– 600
– 57
ATTENUATOR CONTROL
CT Voltage (with Respect to VB)
(Full Range, B5 = 0) Rx Mode (Maximum Volume)
(Full Range, B5 = 0) Idle Mode
(Full Range, B5 = 0) Tx Mode
(Half Range, B5 = 1) Rx Mode (Maximum Volume
(Half Range, B5 = 1) Idle Mode
(Half Range, B5 = 1) Tx Mode
VCT – VB
+150
0
–100
+85
0
–35
CT Source Current (Switching to Rx Mode)
CT Sink Current (Switching to Tx Mode)
CT Idle Current
ICTR
ICTT
ICTI
–55 –42
33 42
–3.0 0
Dial Tone Detector Threshold (with Respect to VB at RXO)
VDT
–40 –20
Max
6.5
3.5
300
0.8
VCC
1.0
+85
Max
6.0
170
2.3
–33
55
3.0
–8.0
Unit
Vdc
mVrms
Vdc
MHz
mA
°C
Unit
mA
µA
Vdc
dB
mV
µA
µA
µA
mV
2 MOTOROLA ANALOG IC DEVICE DATA


Part Number MC33218A
Description VOICE SWITCHED SPEAKERPHONE
Maker Motorola
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