Samsung KA8601C Datasheet

KA8601C SPEAKER PHONE WITH SPEECH NETWORK

BNM : Back Noise Monitor

ORDERING INFORMATION

INTRODUCTION

The KA8601C is a monolithic integrated circuit for use in high perfor­mance speaker phone system.
The KA860lC consists of speaker phone and speech network. Speaker
phone includes attenuators, amplifiers, level detectors, attenuator
control, hybrid amplifiers, regulator and AGC circuit. Speech network
includes transmit amp, receive amp, voltage regulator for dialer, side
tone control, and line equalizer.

FEATURES

• Speaker Phone

- Low Operating Voltage (3.0 ~ 6.5V)

- High Attenuator Gain Range (52dB)

- Improved Sensitivity (Four-point Signal Sensing)

- Chip Disable for Active or Standby Operation

- Microphone Amp Gain set by External Components

• Speech Network

- Low Operating Voltage (1.5V : speech)

- Regulated Voltage for Dialer (Typically 3.3V)

- Transmit, Receive, Side Tone Gains set by
External Components

- Mute Input for DTMF Dialing

KA8601C 48-SDIP-600

BLOCK DIAGRAM

TX1

RX1

DTO­48

GND

44

RX1

PD RXDETI

43

42

ATT

ATT

RXO

RXI

DTI
47

46

45

DETO

41

DETO

40

TX1

DETI

39

MICO

38

MICIMTVC

36

37

35

48-SDIP-600

Device Package Operating Temperature

- 25°C ~ + 75°C

TX2

RX2

RX2

CT

DETI

34

33

DETO

32

DETO

31

TX2

DETI

30

PD TXVB

29

ATT

ATT

DD

TXI

TXO

V

28

27

26

25

hybrid

amp 1

SPEAKER PHONE PART

hybrid

amp 2

1

2

3

DTO+CDFI

RX

FILTER

4

4

FO

Attenuator

5

MT

BNM

DC level

shift

6

VI

SPEECH NET-

WORK PART

8

7

VL

LC

level

detector

1.7Vreg

9

VR

10

MICI-

11

MICI+

mic

amp

12

GND

mic

amp

ATTENUATOR
CONTROLLER

TX

13

MICO

14

TXI

amp2

TX

15

AGC

AGC

AGC

amp1

level

detector

REC

amp

16

17

RXO+NCNC

BNM

sidetone

amp

20

18

19

RXI

RXO-

21

SUM

RXO

TX

Attenuator

RX

22

ZB

amp

3.3Vreg

POWER

23

24

CC

V

MS

KA8601C SPEAKER PHONE WITH SPEECH NETWORK

PIN CONFIGURATION

1

DTO+

2

CD

3

FI

4

FO

5

R4

6

V

I

7

VL

8

L

C

9

VR

10

MICI-

MICI+

GND

MICO

AGC

RXO+

RXO-

RXI

RXO

SUM

V

KA8601C

11

12

13

14

TXI

15

16
17

NC

18

NC

19

20

21

22

Z

B

23

MS

24

CC

48

47

46

45
44

43

42

41

40

39

38

37

36

35

34

33
32

31

30

29

28

27

26

25

Fig. 2

PIN DESCRIPTION

Pin No Symbol Description

1 DTO+ Output of the second hybrid amplifier.
2 CD Chip Disable. A logic low (<0.8V) sets normal operation.
3 FI Filter input.
4 FO Filter output.
5 MT Mute input. A logic “1” sets normal speech mode.
6 V

7 V
8 L

9 V

I

L

C

R

10 MICI- Inverting differential input to the mic amp.
11 MICI+ Non-inverting differential input to the mic amp.
12 GND Ground pin for the speech network.
13 MICO Mic amp output.
14 TXI Input to the TX amp from the Mic amp.
15 AGC Loop current sensing input.

A resistor connected from this pin to VSS sets the AC terminating impedance.
Power supply for the speech network. Supply voltage is derived from loop current.
TX amp output operates on this pin.
Resistor at this pin set the DC characteristics of the circuit.
A 1.7 volt regulated output which can be used to bias the mic.

DTO­DTI

ATT

RXO
RXI

ATT

GND
PD

RX

DETIRX1
DETO
DETOTX1
DETI

TX1

MICO
MICI
MT
V

C

CT
DETIRX2
DETO
DETO
DETI

TX2

PD

TX

V

B

TXI

ATT

TXO

ATT

V

DD

RX1

RX2

TX2

KA8601C SPEAKER PHONE WITH SPEECH NETWORK

PIN DESCRIPTION (continued)

Pin No Symbol Description

16 RXO+ RX amp non-inverting differential output.
17 NC No connection.
18 NC No connection.
19 RXO- RX amp inverting differential output.
20 RXI Input to the RX amp.
21 RXO
22 Z

SUM

B

23 MS
24 V
25 V
26 TXO
27 TXI
28 V
29 PD

CC

DD

ATT

ATT

B

TX

30 DETITX2 Input to the TX level detector on the mike/speaker side.
31 DETOTX2 Output of the TX level detector on the mike/speaker side.
32 DETORX2 Output of the RX level detector on the mike/speaker side.
33 DETIRX2 Input to the RX level detector on the mike/speaker side.
34 C
35 V

T

C

36 MT
37 MICI Input and summing node of the mic amp.

38 MICO Output of the mic amp is set by external resistors.
39 DETTX1 Input to the TX level detector on the line side.
40 DETOTX1 Output of the TX level detector on the line side.
41 DETORX1 Output of the RX level detector on the line side.
42 DETIRX1 Input to the RX level detector on the line side.
43 PD

RX

44 GND Ground pin for the speaker phone part.
45 RXI
46 RXO

ATT

ATT

47 DTI Input and summing node of the mic amp.
48 DTO - Output of the first hybrid amplifier.

Summed output of the RX current amp.
Input to the RX current amp.
Mode select input. A logic “1” → pulse dialing, A logic “0” → tone (DTMF) dialing.
A supply voltage pin for the speaker phone part.
A regulated 3.3 volt output for an external dialer.
Output of the TX attenuator.
Input to the TX attenuator.
This voltage is a system AC ground, and biases the volume control. A filter cap is required.
An RC at this pin sets the time constant for the TX background monitor.

This pin sets the response time for the circuit to switch modes.
Volumn control input.
Mute input. A logic low (<0.8V) sets normal operation. A logic high (>2.0V) mutes the
mic amp.

A RC at this pin sets the time constant for the RX background monitor.

Input to the RX attenuator and dial tone detector.
Output of the RX attenuator.