Order
Freescale Semiconductor, Inc.
this document by MC33218A/D
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
MC33218A
VOICE SWITCHED
SPEAKERPHONE WITH
µPROCESSOR
INTERFACE
SEMICONDUCTOR
TECHNICAL DATA
Freescale Semiconductor, Inc...
24
1
P SUFFIX
PLASTIC PACKAGE
CASE 724
•
•
•
24
1
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
DW SUFFIX
PLASTIC PACKAGE
CASE 751E
•
•
PIN CONNECTIONS
CP2
XDI
CPT
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
VCC
TAO
MCO
MCI
POR
DR
DATA
CLK
RXI
RXO
RAO
GND
Simplified Block Diagram
Microphone
Transmit
Out
VB
Receive
In
TLI
TLO
VB
CT
CD
VB
NC
CPR
RLI
VB
BNM
CLK
DATA
POR
DR
CD
VCC
VB
Serial
Port
Tx Attenuator
Attenuator Control
DTD
Rx Attenuator
BNM
VB
RLO
(Top View)
Reg.
MC33218A
ORDERING INFORMATION
Device
MC33218ADW
Operating
Temperature Range
TA = – 40° to +85°C
Package
SO–24L
Plastic DIP
Speaker
Speaker Amplifier
This device contains 610 active transistors.
MC33218AP
This document contains information on a new product. Specifications and information herein are
subject to change without notice.
©
Motorola, Inc. 1995
MOTOROLA ANALOG IC DEVICE DATA
For More Information On This Product,
Go to: www.freescale.com
1
MC33218A
Freescale Semiconductor, Inc.
MAXIMUM RATINGS
Rating
Supply Voltage
Any Input
Maximum Junction Temperature
Storage Temperature Range
Symbol
VCC
Vin
TJ
Tstg
Min
–0.5
–0.4
–
–65
Max
7.0
VCC + 0.4
+150
+150
Unit
Vdc
Vdc
°C
°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
Symbol
VCC
Vin(max)
VINL
0
2.0
FDATA
IVB
TA
0
–
–40
–
–
–
See
Figure 14
–
0.8
VCC
1.0
–
+85
MHz
mA
°C
Min
3.5
2.7
–
Typ
–
–
–
Max
6.5
3.5
300
Unit
Vdc
mVrms
Vdc
Freescale Semiconductor, Inc...
Logic Input Voltage (Pins 8, 17–19)
Low
High
Clock and Data Rate (Serial Port)
VB Output Current
Operating Ambient Temperature Range
ELECTRICAL CHARACTERISTICS
(TA = + 25°C, VCC = 5.0 V, CD
≤
0.8 V, unless noted, see Figure 3.)
Characteristic
POWER SUPPLY
Supply Current (Enabled, CD
≤
0.8, VB Open, See Figure 13)
Idle Mode
Tx Mode
Rx Mode
Supply Current (Disabled, CD = 2.0 V, VB Open)
VCC = 3.0 V
VCC = 5.0 V
VCC = 6.5 V
VB Output Voltage (IVB = 0, CD = 0)
VCC = 2.7 V
VCC = 5.0 V
VCC = 6.5 V
VB Output Resistance (IVB
≤
–1.0 mA)
PSRR @ VB versus VCC, f = 1.0 KHz, CVB = 100
µF
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
CT Source Current (Switching to Rx Mode)
CT Sink Current (Switching to Tx Mode)
CT Idle Current
Dial Tone Detector Threshold (with Respect to VB at RXO)
ICTR
ICTT
ICTI
VDT
VCT – VB
–
–
–
–
–
–
–55
33
–3.0
–40
+150
0
–100
+85
0
–35
–42
42
0
–20
–
–
–
–
–
–
–33
55
3.0
–8.0
µA
µA
µA
mV
mV
ICCE
3.0
–
–
ICCD
–
50
–
VB
–
2.1
–
ROVB
PSRR
–
–
0.9
2.2
3.0
600
57
–
2.3
–
–
–
Ω
dB
67
110
150
–
170
–
Vdc
4.6
4.6
5.3
6.0
–
–
µA
mA
Symbol
Min
Typ
Max
Unit
2
For More Information On This Product,
MOTOROLA ANALOG IC DEVICE DATA
Go to: www.freescale.com
MC33218A
Freescale Semiconductor, Inc.
ELECTRICAL CHARACTERISTICS (continued)
(TA = + 25°C, VCC = 5.0 V, CD
≤
0.8 V, unless noted, see Figure 3.)
Characteristic
ATTENUATORS
Receive Attenuator Gain (f = 1.0 kHz, Maximum Volume)
Full Attenuation Range (B5 = 0)
Rx Mode
Tx Mode
Idle Mode
Range (Rx to Tx Mode)
Half Attenuation Range (B5 = 1)
Rx Mode
Tx Mode
Idle Mode
Range (Rx to Tx Mode)
Volume Control Range
(Rx Mode Only, B3–B0 Changed from 0000 to 1111, See Figures 6, 7)
dB
GRXF
GRXTF
GRXIF
∆G
RXF
GRXH
GRXTH
GRXIH
∆G
RXH
VCR
34
–
GAGC
12
–
21
19
28
–
dB
GTXF
GTXRF
GTXIF
∆G
TXF
GTXH
GTXRH
GTXIH
∆G
TXH
IOATT
VRAO
–
–
–
VTAO
–
–
–
–2.0
– 5.0
–50
–
–
–
–50
0
–2.0
–
–
–
mVdc
3.0
– 49
–19
50
– 9.0
– 36
–19
23
–
6.7
– 47
–16
53
–6.5
– 34
–16
27
2.0
9.0
– 43
–13
56
– 3.0
– 30
–13
29
–
mA
mVdc
40
25
46
–
dB
3.0
–49
–28
50
–10
– 37
– 28
23
6.7
–47
–25
53
–7.0
– 34
– 25
27
9.0
– 43
– 22
56
– 4.0
– 31
– 22
29
dB
Symbol
Min
Typ
Max
Unit
Freescale Semiconductor, Inc...
Full Range
Half Range
AGC Attenuation Range
(VCC = 3.5 to 2.7 V, Receive Mode Only, B3–B0 = 0000, See Figure 8)
Full Range
Half Range
Transmit Attenuator Gain (f = 1.0 kHz, Maximum Volume)
Full Attenuation Range (B5 = 0)
Tx Mode
Rx Mode
Idle Mode
Range (Tx to Rx Mode)
Half Attenuation Range (B5 = 1)
Tx Mode
Rx Mode
Idle Mode
Range (Tx to Rx Mode)
RAO, TAO Output Current Capability
RAO Offset Voltage with Respect to VB
Rx Mode
Idle Mode
Tx Mode
TAO Offset Voltage with Respect to VB
Rx Mode
Idle Mode
Tx Mode
MICROPHONE AMPLIFIER
(Pins 21, 22)
Output Offset with Respect to VB (RF = 300 kΩ)
Input Bias Current (Pin 21)
Open Loop Gain (f < 100 Hz)
Gain Bandwidth
Maximum Output Voltage Swing (Note 1)
Maximum Output Current Capability
MUTING
(∆ Gain)
Microphone Amplifier Only (Measured at Pin 22)
RF = 300 kΩ
RF = 100 kΩ
Microphone Amplifier + Transmit Attenuator in Receive Mode
(Measured at Pin 23) RF = 300 kΩ
AMT
MCOVOS
IMBIAS
AVOLM
GBWM
VOMAX
IOMCO
–
–
–
–
–
–
– 10
– 30
80
1.5
350
2.0
–
–
–
–
–
–
mVdc
nA
dB
MHz
mVrms
mA
dB
–
–
73
64
113
–
–
dB
95
–
TMT
NOTE:
1. Output swing is limited by the capability of the transmit attenuator input. See Figure 16.
MOTOROLA ANALOG IC DEVICE DATA
For More Information On This Product,
Go to: www.freescale.com
3
MC33218A
Freescale Semiconductor, Inc.
ELECTRICAL CHARACTERISTICS (continued)
(TA = + 25°C, VCC = 5.0 V, CD
≤
0.8 V, unless noted, see Figure 3.)
Characteristic
MUTING
(∆ Gain)
Timing from Data Ready Lo–to–Hi (See Figure 27)
To Mute
To Enable
RECEIVE AMPLIFIER
(Pins 15, 16)
Output Offset with Respect to VB (RF = 10 kΩ)
Input Bias Current (Pin 16)
Open Loop Gain (f < 100 Hz)
Gain Bandwidth
Maximum Output Voltage Swing (Note 2)
Maximum Output Current Capability
RXOVOS
IRBIAS
AVOLR
GBWR
VOMAX
IORXO
–
–
–
–
–
–
–1.3
–30
80
1.5
350
2.0
–
–
–
–
–
–
mVdc
nA
dB
MHz
mVrms
mA
µs
tMM
tENM
–
–
2.0
1.0
–
–
Symbol
Min
Typ
Max
Unit
Freescale Semiconductor, Inc...
LEVEL DETECTORS AND BACKGROUND NOISE MONITORS
Tx–Rx Switching Threshold (Pins 4, 11)
CPR, CPT Output Resistance (for Pulldown)
CPR, CPT Leakage Current
CPR, CPT Nominal DC Voltage (No Signal)
TLO, RLO, CP2 Source Current (@ VB – 1.0 V)
TLO, RLO, CP2 Output Resistance
TLO, RLO, CP2 Sink Current (@ VB + 1.0 V)
CD INPUT
(Pin 8)
Switching Threshold
Input Resistance (Vin = 0.8 V)
Input Current (Vin = 5.0 V)
Timing
To Disable
To Enable
POR INPUT
(Pin 20)
Switching Threshold (2.7 V
≤
VCC
≤
6.5 V)
Nominal DC Voltage (2.7 V
≤
VCC
≤
6.5 V)
Effective Resistance (0 V < Vin < 0.5 V)
Input Current
Vin = 0 V
Vin = 5.0 V
Timing to Reset (Pin 20 Taken to < 1.2 V)
Minimum Power On Reset Time (See Figure 20)
C = 0.1
µF
VCC = 6.5 V
C = 0.1
µF
VCC = 5.0 V
C = 0.1
µF
VCC = 2.7 V
VTHPOR
VPOR
RPOR
IPOR
–
–
tPOR
TMPOR
–
–
–
2.7
3.7
10.6
–
–
–
–
– 40
630
30
–
–
–
µs
ms
–
–
70
1.2
1.5
115
–
–
160
Vdc
Vdc
kΩ
µA
VTHCD
RCD
ICD
tCD
tENC
–
170
–
–
–
1.5
235
40
3.0
See
Figure 26
–
300
–
–
–
Vdc
kΩ
µA
µs
ITH
RCP
ICPLK
VCP
ILDOH
RLD
ILDOL
0.8
–
–
–
–
–
–
1.0
5.0
– 0.2
1.9
–2.0
500
2.0
1.2
–
–
–
–
–
–
µA/µA
Ω
µA
Vdc
mA
Ω
µA
NOTE:
2. Output swing is limited by the capability of the receive attenuator input. See Figure 16.
4
For More Information On This Product,
MOTOROLA ANALOG IC DEVICE DATA
Go to: www.freescale.com
MC33218A
Freescale Semiconductor, Inc.
ELECTRICAL CHARACTERISTICS (continued)
(TA = + 25°C, VCC = 5.0 V, CD
≤
0.8 V, unless noted, see Figure 3.)
Characteristic
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
Data Input Current (Pin 18)
Vin = 0.9 V
Vin = 5.0 V
Data Ready Input Current (Pin 19)
Vin = 0.9 V
Vin = 5.0 V
VTHSP
IINCK
5.6
–
5.2
–
IINDA
5.6
–
IINDR
13.8
–
t1
t2
t3
t4
t5
–
–
–
–
–
20
200
200
100
100
100
200
36
–
ns
–
–
–
–
–
7.5
75
12.8
–
µA
7.5
75
7.9
84
12.8
–
13.3
–
µA
–
1.3
–
Vdc
µA
Symbol
Min
Typ
Max
Unit
Freescale Semiconductor, Inc...
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)
Microphone Amplifier + Tx Attenuator Distortion
Receive Amplifier + Rx Attenuator Distortion
THDT
THDR
–
–
0.2
0.2
3.0
3.0
%
%
Figure 1. System Distortion Test
Vin
3.5 mV
1.0 kHz
3.0 k
MCI
21
300 k
MCO
22
Tx Attenuator
TAO
23
Vout
VB
NOTE:
Tx Attenuator forced to transmit mode.
Vin
350 mV
1.0 kHz
10 k
RXI
16
10 k
RXO
15
Rx Attenuator
RAO
14
Vout
VB
NOTE:
Rx Attenuator forced to receive mode.
MOTOROLA ANALOG IC DEVICE DATA
For More Information On This Product,
Go to: www.freescale.com
5
嵌入式系统
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
