Motorola MC33218AP, MC33218DW Datasheet

Order this document by MC33218A/D

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Operating

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SEMICONDUCTOR

TECHNICAL DATA

DW SUFFIX

PLASTIC PACKAGE

CASE 751E

VOICE SWITCHED

SPEAKERPHONE WITH

µPROCESSOR INTERFACE

PIN CONNECTIONS

ORDERING INFORMATION

MC33218ADW
MC33218AP

TA = – 40° to +85°C

SO–24L

Plastic DIP

24

1

P SUFFIX

PLASTIC PACKAGE

CASE 724

24

1

CP2 1 24

(Top View)

V

CC

2
3
4
5
6
7
8
9
10
11
12

23
22
21
20
19
18
17
16
15
14
13

XDI

CPT

TLI

TLO

V

B

C

T

CD
NC

CPR

RLI

RLO

TAO
MCO
MCI
POR
DR
DATA
CLK
RXI
RXO
RAO
GND

1

MOTOROLA ANALOG IC DEVICE DATA

 

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  

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

This document contains information on a new product. Specifications and information herein are
subject to change without notice.

 Motorola, Inc. 1995

Simplified Block Diagram

This device contains 610 active transistors.

Microphone

Transmit
Out

V

B

V

B

V

B

V

B

V

B

BNM

Reg.

Rx Attenuator

MC33218A

V

CC

Tx Attenuator

Attenuator Control

DTD

Speaker
Amplifier

Speaker

CD

Receive

In

BNM

DR

DATA

POR

CLK

Serial

Port

MC33218A

2

MOTOROLA ANALOG IC DEVICE DATA

MAXIMUM RATINGS

Rating Symbol Min Max Unit

Supply Voltage V

CC

–0.5 7.0 Vdc

Any Input V

in

–0.4 VCC + 0.4 Vdc

Maximum Junction Temperature T

J

– +150 °C

Storage Temperature Range T

stg

–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 Symbol Min Typ Max Unit

Supply Voltage (Non–AGC Range) V

CC

3.5 – 6.5 Vdc

(AGC Range) 2.7 – 3.5

Maximum Attenuator Input Signal V

in(max)

– – 300 mVrms

Logic Input Voltage (Pins 8, 17–19) V

INL

Vdc
Low 0 – 0.8
High 2.0 – V

CC

Clock and Data Rate (Serial Port) F

DATA

0 – 1.0 MHz

VB Output Current I

VB

– See

Figure 14

– mA

Operating Ambient Temperature Range T

A

–40 – +85 °C

ELECTRICAL CHARACTERISTICS (T

A

= +25°C, VCC = 5.0 V, CD ≤ 0.8 V, unless noted, see Figure 3.)

Characteristic

Symbol Min Typ Max Unit

POWER SUPPLY

Supply Current (Enabled, CD ≤ 0.8, VB Open, See Figure 13) I

CCE

mA
Idle Mode 3.0 4.6 6.0
Tx Mode – 4.6 –
Rx Mode – 5.3 –

Supply Current (Disabled, CD = 2.0 V , VB Open) I

CCD

µA
VCC = 3.0 V – 67 –
VCC = 5.0 V 50 110 170
VCC = 6.5 V – 150 –

VB Output Voltage (IVB = 0, CD = 0) V

B

Vdc
VCC = 2.7 V – 0.9 –
VCC = 5.0 V 2.1 2.2 2.3
VCC = 6.5 V – 3.0 –

VB Output Resistance (IVB ≤ –1.0 mA) R

OVB

– 600 – Ω

PSRR @ VB versus VCC, f = 1.0 KHz, CVB = 100 µF PSRR – 57 – dB

ATTENUATOR CONTROL

CT Voltage (with Respect to VB) VCT – V

B

mV
(Full Range, B5 = 0) Rx Mode (Maximum Volume) – +150 –

(Full Range, B5 = 0) Idle Mode – 0 –
(Full Range, B5 = 0) Tx Mode – –100 –

(Half Range, B5 = 1) Rx Mode (Maximum Volume – +85 –

(Half Range, B5 = 1) Idle Mode – 0 –
(Half Range, B5 = 1) Tx Mode – –35 –

CT Source Current (Switching to Rx Mode) I

CTR

–55 –42 –33 µA

CT Sink Current (Switching to Tx Mode) I

CTT

33 42 55 µA

CT Idle Current I

CTI

–3.0 0 3.0 µA

Dial Tone Detector Threshold (with Respect to VB at RXO) V

DT

–40 –20 –8.0 mV

MC33218A

3

MOTOROLA ANALOG IC DEVICE DATA

ELECTRICAL CHARACTERISTICS (continued) (T

A

= +25°C, VCC = 5.0 V, CD ≤ 0.8 V, unless noted, see Figure 3.)

Characteristic UnitMaxTypMinSymbol

ATTENUATORS

Receive Attenuator Gain (f = 1.0 kHz, Maximum Volume) dB

Full Attenuation Range (B5 = 0)

Rx Mode

G

RXF

3.0 6.7 9.0

Tx Mode G

RXTF

–49 –47 –43

Idle Mode G

RXIF

–28 –25 –22

Range (Rx to Tx Mode) ∆G

RXF

50 53 56

Half Attenuation Range (B5 = 1)

Rx Mode

G

RXH

–10 –7.0 –4.0

Tx Mode G

RXTH

–37 –34 –31

Idle Mode G

RXIH

–28 –25 –22

Range (Rx to Tx Mode) ∆G

RXH

23 27 29

Volume Control Range

(Rx Mode Only, B3–B0 Changed from 0000 to 1111, See Figures 6, 7)

V

CR

dB

Full Range 34 40 46
Half Range – 25 –

AGC Attenuation Range

(VCC = 3.5 to 2.7 V , Receive Mode Only, B3–B0 = 0000, See Figure 8)

G

AGC

dB

Full Range 12 21 28
Half Range – 19 –

Transmit Attenuator Gain (f = 1.0 kHz, Maximum V olume) dB

Full Attenuation Range (B5 = 0)

Tx Mode G

TXF

3.0 6.7 9.0

Rx Mode G

TXRF

–49 –47 –43

Idle Mode G

TXIF

–19 –16 –13

Range (Tx to Rx Mode) ∆G

TXF

50 53 56

Half Attenuation Range (B5 = 1)

Tx Mode G

TXH

–9.0 –6.5 –3.0

Rx Mode G

TXRH

–36 –34 –30

Idle Mode G

TXIH

–19 –16 –13

Range (Tx to Rx Mode) ∆G

TXH

23 27 29

RAO, TAO Output Current Capability I

OATT

– 2.0 – mA

RAO Offset Voltage with Respect to V

B

V

RAO

mVdc
Rx Mode – –50 –
Idle Mode – 0 –
Tx Mode – –2.0 –

TAO Offset Voltage with Respect to V

B

V

TAO

mVdc
Rx Mode – –2.0 –
Idle Mode – –5.0 –
Tx Mode – –50 –

MICROPHONE AMPLIFIER (Pins 21, 22)

Output Offset with Respect to VB (RF = 300 kΩ) MCO

VOS

– –10 – mVdc

Input Bias Current (Pin 21) I

MBIAS

– –30 – nA

Open Loop Gain (f < 100 Hz) A

VOLM

– 80 – dB

Gain Bandwidth GBW

M

– 1.5 – MHz

Maximum Output Voltage Swing (Note 1) V

OMAX

– 350 – mVrms

Maximum Output Current Capability I

OMCO

– 2.0 – mA

MUTING (∆ Gain)

Microphone Amplifier Only (Measured at Pin 22) AMT dB

RF = 300 kΩ – 73 –
RF = 100 kΩ – 64 –

Microphone Amplifier + Transmit Attenuator in Receive Mode

(Measured at Pin 23) RF = 300 kΩ

TMT

95 113 –

dB

NOTE: 1. Output swing is limited by the capability of the transmit attenuator input. See Figure 16.

MC33218A

4

MOTOROLA ANALOG IC DEVICE DATA

ELECTRICAL CHARACTERISTICS (continued)

(TA = +25°C, VCC = 5.0 V, CD ≤ 0.8 V, unless noted, see Figure 3.)

Characteristic UnitMaxTypMinSymbol

MUTING (∆ Gain)

Timing from Data Ready Lo–to–Hi (See Figure 27) µs

To Mute t

MM

– 2.0 –

To Enable t

ENM

– 1.0 –

RECEIVE AMPLIFIER (Pins 15, 16)

Output Offset with Respect to VB (RF = 10 kΩ) RXO

VOS

– –1.3 – mVdc

Input Bias Current (Pin 16) I

RBIAS

– –30 – nA

Open Loop Gain (f < 100 Hz) A

VOLR

– 80 – dB

Gain Bandwidth G

BWR

– 1.5 – MHz

Maximum Output Voltage Swing (Note 2) V

OMAX

– 350 – mVrms

Maximum Output Current Capability I

ORXO

– 2.0 – mA

LEVEL DETECTORS AND BACKGROUND NOISE MONITORS

Tx–Rx Switching Threshold (Pins 4, 11) I

TH

0.8 1.0 1.2 µA/µA

CPR, CPT Output Resistance (for Pulldown) R

CP

– 5.0 – Ω

CPR, CPT Leakage Current I

CPLK

– –0.2 – µA

CPR, CPT Nominal DC Voltage (No Signal) V

CP

– 1.9 – Vdc

TLO, RLO, CP2 Source Current (@ VB – 1.0 V) I

LDOH

– –2.0 – mA

TLO, RLO, CP2 Output Resistance R

LD

– 500 – Ω

TLO, RLO, CP2 Sink Current (@ VB + 1.0 V) I

LDOL

– 2.0 – µA

CD INPUT (Pin 8)

Switching Threshold V

THCD

– 1.5 – Vdc

Input Resistance (Vin = 0.8 V) R

CD

170 235 300 kΩ

Input Current (Vin = 5.0 V) I

CD

– 40 – µA

Timing µs

To Disable t

CD

– 3.0 –

To Enable t

ENC

– See

Figure 26

–

POR INPUT (Pin 20)

Switching Threshold (2.7 V ≤ VCC ≤ 6.5 V) V

THPOR

– 1.2 – Vdc

Nominal DC Voltage (2.7 V ≤ VCC ≤ 6.5 V) V

POR

– 1.5 – Vdc

Effective Resistance (0 V < Vin < 0.5 V) R

POR

70 115 160 kΩ

Input Current I

POR

µA
Vin = 0 V – –40 –
Vin = 5.0 V – 630 –

Timing to Reset (Pin 20 Taken to < 1.2 V) t

POR

– 30 – µs

Minimum Power On Reset Time (See Figure 20) T

MPOR

ms
C = 0.1 µF VCC = 6.5 V – 2.7 –

C = 0.1 µF VCC = 5.0 V – 3.7 –
C = 0.1 µF VCC = 2.7 V – 10.6 –

NOTE: 2. Output swing is limited by the capability of the receive attenuator input. See Figure 16.

MC33218A

5

MOTOROLA ANALOG IC DEVICE DATA

ELECTRICAL CHARACTERISTICS (continued) (T

A

= +25°C, VCC = 5.0 V, CD ≤ 0.8 V, unless noted, see Figure 3.)

Characteristic UnitMaxTypMinSymbol

SERIAL PORT (Pins 17–19)

Switching Threshold V

THSP

– 1.3 – Vdc

Clock Input Current (Pin 17) I

INCK

µA
DR ≤ 0.8 V Vin = 0.9 V 5.6 7.5 12.8

DR ≤ 0.8 V Vin = 5.0 V – 75 –

DR ≥ 2.0 V Vin = 0.6 V 5.2 7.9 13.3

DR ≥ 2.0 V Vin = 5.0 V – 84 –

Data Input Current (Pin 18)

Vin = 0.9 V
Vin = 5.0 V

I

INDA

5.6
–

7.5
75

12.8
–

µA

Data Ready Input Current (Pin 19)

Vin = 0.9 V
Vin = 5.0 V

I

INDR

13.8
–

20

200

36

–

µA

Timing (Minimum Requirements) (See Figure 2) ns

Data Ready Falling Edge to Clock t

1

– 200 –

8th Clock Rising Edge to DR Rising Edge t

2

– 100 –

Data Setup Time t

3

– 100 –

Data Hold Time t

4

– 100 –

Clock High Time t

5

– 200 –

SYSTEM DISTORTION (See Figure 1)

Microphone Amplifier + Tx Attenuator Distortion THD

T

– 0.2 3.0 %

Receive Amplifier + Rx Attenuator Distortion THD

R

– 0.2 3.0 %

Figure 1. System Distortion Test

V

out

V

in

3.5 mV

1.0 kHz

V

B

Tx Attenuator

23

TAO

2221

MCI MCO

3.0 k 300 k

NOTE: Rx Attenuator forced to receive mode.

NOTE: Tx Attenuator forced to transmit mode.

V

out

V

in

350 mV

1.0 kHz

V

B

Rx Attenuator

14

RAO

1516

RXI RXO

10 k 10 k

MC33218A

6

MOTOROLA ANALOG IC DEVICE DATA

TYPICAL TEMPERATURE PERFORMANCE

Characteristics –40°C 0°C +25°C +85°C Unit

Power Supply Current

Enabled, VB Open 5.4 4.9 4.6 4.2 mA

Disabled, VB Open 129 118 110 125 µA
VB Output Voltage (IVB = 0) 2.0 2.15 2.2 2.3 Vdc
CT Source Current (Switching to Rx Mode) –37 –41 –42 –42 µA
CT Sink Current (Switching to Tx Mode) 36 41 42 43 µA
Attenuator “On” Gain (Full Range) 6.7 6.7 6.7 6.4 dB
Attenuator Range (Full Range) 53 53 53 53 dB
Volume Control Range (Rx Mode Only, B3–B0

Changed from 0000 to 1111)

36 39 40 42 dB

AGC Attenuation Range 38 20 21 22 dB

NOTE: Temperature data is typical performance only, based on sample characterization, and does not provide guaranteed limits over temperature.

PIN FUNCTION DESCRIPTION

Pin Symbol

Description

1 CP2 A capacitor at this pin stores voltage representing the transmit background noise and speech levels for the

background noise monitor.
2 XDI Input to the transmit background noise monitor .
3 CPT An RC sets the time constant for the transmit background noise monitor.
4 TLI Input to the transmit level detector.
5 TLO Output of the transmit level detector.
6 V

B

A mid–supply reference voltage, and analog ground for the amplifiers. This must be well bypassed for proper

power supply rejection.
7 C

T

An RC sets the switching time between transmit, receive and idle modes.
8 CD Chip Disable (Logic Input). When low, the IC is active. When high, the entire IC is powered down and

non–functional, except for VB. Input impedance is nominally 235 kΩ.
9 NC No internal connection.

10 CPR An RC sets the time constant for the receive background noise monitor.
11 RLI Input to the receive level detector.
12 RLO Output of the receive level detector.
13 GND Ground pin for the entire IC.
14 RAO Output of the receive attenuator.
15 RXO Output of the receive path input amplifier, and input of the receive attenuator and the dial tone detector.
16 RXI Inverting input of the receive amplifier. Bias current flows out of the pin.
17 CLK Serial Port Clock. 1.0 MHz maximum. Data is entered on clock’s rising edge.
18 DATA Serial Port Data Input. Data consists of an 8 bit word, B7 first, B0 last.
19 DR Serial Port Data Ready. Taking this line high latches new data into the registers.
20 POR Power On Reset for the serial port. Upon power up, or when CD is active, all internal registers are set to logic 0.

This logic input may be taken low to reset the registers.

21 MCI Inverting input of the microphone amplifier. Bias current flows out of the pin.
22 MCO Output of the microphone amplifier, and input of the transmit attenuator.
23 TAO Output of the transmit attenuator.
24 V

CC

Power Supply Pin. Operating Range is 2.7 V to 6.5 Vdc. Bypassing is requried.

MC33218A

7

MOTOROLA ANALOG IC DEVICE DATA

Figure 2. Serial Port Timing Diagram

NOTES: 1. Maximum clock and data rate is 1.0 MHz. There is no required minimum rate.

2.B7 is to be entered first, B0 last.

3.Data is entered on the clock rising edge.

4.Clock can continue to toggle after B0 is entered if Data Ready goes high before the clock’s next rising edge.
This is not recommended due to possible noise problems.

5.Upon power up, all bits are internally set to logic 0, by the POR pin.

6.Data Ready must go low before the first falling clock edge after the clock rising edge associated with B7.
See text for additional information.

B7

t

2

Data Ready

Clock

Data In

t

5

B6 B5 B4 B3 B2 B1 B0

t

1

t3t

4

SERIAL PORT CONTROL BITS

Bits Code Function

B7, B6 00

01
10
11

Normal voice switched operation
Force to receive mode
Force to idle mode
Force to transmit mode

B5 01Attenuator range is 53 dB

Attenuator range is 27 dB

B4 01Microphone amplifier is active

Microphone amplifier is muted

B3–B0
(Note 1)

0000
1111

Maximum receive volume
Minimum receive volume

NOTE: 1. Bit B0 is the LSB for the volume control.

MC33218A

8

MOTOROLA ANALOG IC DEVICE DATA

Figure 3. MC33218A Block Diagram and Test Circuit

NOTES: 1. All capacitors are in µF unless otherwise noted.

2.Values shown are suggested initial values only . See Applications Information for circuit adjustments.

MC341 19

Speaker
Amplifier

Receive Input

From 2–4 Wire

Converter

Rx Attenuator

Attenuator Control Circuit

Tx Attenuator

Bias

AGC

T

x

BNM

Dial Tone
Detector

R

x

BNM

0.1

5.1 k
R

2

10 k

10 k

0.1

1.0

47

100 k

V

CC

100

15

15 k

1.0

100

V

B

V

B

V

TH

Microprocessor

DR

Disable

CD

V

CC

0.22

From

Microphone

Transmit Output

To 2–4 Wire Converter

470.14.7 k

0.1

5.1 k

300 k

1.0
100 k

V

CC

VB6

7

5

16

15

14111210

13

24

8

18

21

22

3.0 k

V

B

34

223

1

Tx–Rx Comp.

V

B

V

CC

V

B

Clock

Data

Data

Register

and

Decode

Logic

17
20

19

SPI

Normal

0.1

GND CPR RLO RLI RAO RXO

RXI

CT

TLO

TLICPTCP2TAOMCO XDI

R

1

POR

CK

DIN

DR

MCI

MC33218A

9

MOTOROLA ANALOG IC DEVICE DATA

–35

0

–100

10

ATTENUATOR GAIN (dB)

VCT – VB (mV)

ATTENUATOR GAIN (dB)

0–50

50

150100

5.0

8545

0

–10

–20

–30

–40

–10

–20

–30

–40–50

Transmit

Attenuator

Receive

Attenuator

Transmit

Attenuator

Receive

Attenuator

VCT – VB (mV)

0

10

4

8F

C

0

–10

–20

–30

–50

–40

RECEIVE ATTENUATOR GAIN (dB)

VOLUME SETTING (BITS B3–B0, HEX VALUE)

0

10

4

8F

C

0

–10

–20

–30

–50

–40

RECEIVE ATTENUATOR GAIN (dB)

VOLUME SETTING (BITS B3–B0, HEX VALUE)

V

out – B

, OUTPUT VOL TAGE (mV)V

0

100

Vin, INPUT SIGNAL (mVrms)

60

20

0

–60

–20

–100

2.0 µA

V

out

1.0 µF

500

TLI
RLI
XDI

TLO
RLO
CP2

V

in

@ 1.0 kHz

40 80 120 160 200

C

R

2.7

10

2.9

3.1 3.5

3.3

0

–10

–20

–30

–50

–40

RECEIVE ATTENUATOR GAIN (dB)

VCC (Vdc)

Figure 4. Attenuator Gain versus VCT (Pin 7)

(Full Attenuator Range)

Figure 5. Attenuator Gain versus V

CT

(Half Attenuation Range)

Figure 6. Receive Gain versus Volume Control

Levels (Full Attenuation Range)

Figure 7. Receive Gain versus Volume Control

Levels (Half Attenuation Range)

Figure 8. Receive Gain versus V

CC

Figure 9. Level Detector AC

Transfer Characteristics

–15 25

65

VCC ≥ 3.5 V

VCC = 3.1 V

VCC = 2.7 V

VCC ≥ 3.5 V

VCC = 3.1 V

VCC = 2.7 V

Full Range

Half Range

B3–B0 = 0000

R = 5.1 k, C = 0.1 µF

R = 10 k, C = 0.047 µF

R = 10 k, C = 0.1 µF

V

B