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PDF MC33218A Data sheet ( Hoja de datos )
| Número de pieza | MC33218A | |
| Descripción | VOICE SWITCHED SPEAKERPHONE | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
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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
1 page  
MC33218A
ELECTRICAL CHARACTERISTICS (continued) (TA = + 25°C, VCC = 5.0 V, CD ≤ 0.8 V, unless noted, see Figure 3.)
Characteristic
Symbol Min Typ Max
SERIAL PORT (Pins 17–19)
Switching Threshold
Clock Input Current (Pin 17)
DR ≤ 0.8 V Vin = 0.9 V
DR ≤ 0.8 V Vin = 5.0 V
DR ≥ 2.0 V Vin = 0.6 V
DR ≥ 2.0 V Vin = 5.0 V
VTHSP – 1.3 –
IINCK
5.6 7.5 12.8
– 75 –
5.2 7.9 13.3
– 84 –
Data Input Current (Pin 18)
Vin = 0.9 V
Vin = 5.0 V
IINDA
5.6 7.5 12.8
– 75 –
Data Ready Input Current (Pin 19)
Vin = 0.9 V
Vin = 5.0 V
IINDR
13.8 20
– 200
36
–
Timing (Minimum Requirements) (See Figure 2)
Data Ready Falling Edge to Clock
8th Clock Rising Edge to DR Rising Edge
Data Setup Time
Data Hold Time
Clock High Time
SYSTEM DISTORTION (See Figure 1)
t1 – 200 –
t2 – 100 –
t3 – 100 –
t4 – 100 –
t5 – 200 –
Microphone Amplifier + Tx Attenuator Distortion
Receive Amplifier + Rx Attenuator Distortion
THDT – 0.2 3.0
THDR – 0.2 3.0
Unit
Vdc
µA
µA
µA
ns
%
%
Figure 1. System Distortion Test
Vin
3.5 mV
1.0 kHz
3.0 k 300 k
MCI
21
MCO
22
VB
NOTE: Tx Attenuator forced to transmit mode.
Vin
350 mV
1.0 kHz
10 k 10 k
RXI
16
RXO
15
VB
Tx Attenuator
Rx Attenuator
TAO
23
Vout
RAO
14
Vout
NOTE: Rx Attenuator forced to receive mode.
MOTOROLA ANALOG IC DEVICE DATA
5
5 Page 
MC33218A
Figure 16. Receive Amp and Microphone
Amp Output Swing
1.0
0.5 THD = 5%
0
2.5 3.5
THD ≤ 1%
THD measured at TAO, RAO
4.5
VCC (V)
5.5
6.5
Figure 17. Microphone Amplifier Muting
versus Feedback Resistor
100
80
60
40
20 2.7 V ≤ VCC ≤ 6.5 V
0
1.0 k 10 k 100 k 300 k
RF, FEEDBACK RESISTOR (Ω)
Figure 18. Serial Port Input
Characteristics (Pins 17, 18, 19)
300
DR
200
100 Clk (DR = Hi)
Data & Clk
(DR = Lo)
0 Valid for Vin ≤ VCC
0 1.0 2.0 3.0 4.0 5.0 6.0 7.0
INPUT VOLTAGE (V)
Figure 19. POR Input Characteristics (Pin 20)
1000
800
600
400
200 VCC = 3.0 V
0
–100
0
VCC = 6.5 V
Valid for Vin ≤ VCC
1.0 2.0 3.0 4.0 5.0 6.0
INPUT VOLTAGE (V)
7.0
Figure 20. Minimum Reset Time versus
VCC and Pin 20 Capacitor
80
Time for Pin 20 to reach
1.2 V from Ground.
60
C = 0.68 µF
40
20 C = 0.022 µF
C = 0.1 µF
0
2.5 3.5 4.5
VCC (V)
5.5
6.5
MOTOROLA ANALOG IC DEVICE DATA
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet MC33218A.PDF ] | |
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