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.

MC34119

Speaker

Amplifier

Receive Input

From 2–4 Wire

Converter

Rx Attenuator

Attenuator Control Circuit

Tx Attenuator

Bias

AGC

Tx

BNM

Dial Tone

Detector

Rx

BNM

0.1

5.1 k

R2

10 k

10 k

0.1

1.0

47

100 k

VCC

100

15

15 k

1.0

100

VB

VB

VTH

Microprocessor

DR

Disable

CD

VCC

0.22

From

Microphone

Transmit Output

To 2–4 Wire Converter

47

0.1

4.7 k

0.1

5.1 k

300 k

1.0

100 k

VCC

VB

6

7

5

16

15

14

11

12

10

13

24

8

18

21

22

3.0 k

VB

34

2

23

1

Tx–Rx Comp.

VB

VCC

VB

Clock

Data

Data

Register

and

Decode

Logic

17

20

19

SPI

Normal

0.1

GND

CPR

RLO

RLI

RAO

RXO

RXI

CT

TLO

TLI

CPT

CP2

TAO

MCO

XDI

R1

POR

CK

DIN

DR

MCI

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com