Panasonic AN6448NFBP Datasheet

■ Overview

The AN6448NFBP is a speech network IC suitable for multi­function cordless telephones. It incorporates a cross-point
switch controlled by serial input. It allows speech path switch­ing and mixing, and provides for three- or four-person commu­nication and other sophisticated functions. It also incorporates
REC/PLAY amplifiers with VOX circuits.

■ Features

•

The speech block can operate on line voltage, with no exter­nal power supply, and is operational even during a commer­cial power failure.

•

Incorporates auto. PAD, dial mute, DC voltage regulation,
and other basic speech functions.

•

The cross-point switch can be operated independently.

•

Each output of the cross-point switch can correspond to mul­tiple inputs, allowing three-or four-person communication.

•

The REC/PLAY amplifiers incorporate ALC and VOX circuits.

•

Receiver volume can be increased by 6 dB or 9 dB.

AN6448NFBP

Speech Network IC Incorporating Cross-Point Switch

Unit : mm

QFP package with 64 pins (QFH064-P-1414A)

17.2±0.4

14.0±0.3

17.2±0.4

14.0±0.3

48 33

116

17

32

64

49

2.85±0.2

1.3±0.11.3±0.1

0.1±0.1

0.2

+0.1

-0.05

0.35

+0.1

-0.050.8(0.8)

SEATING PLANE

■ Block Diagram

3348 47 46 45 44 43 42 41 40 39 38 37 36 35 34

1
2
3
4
5
6

DC
Cont.

0dB

32

31

I

30

N

J

29

28

27

26

25

24

23

22

21

20

19

0dB

18

–

17

+

49

–
+

50

V

REF

51

52

+
–

53

54

+
–

55

0dB

56

0dB

57

0dB

58

59

P.O.R

–
+

10dB

0/12dB20

ACL

ACL
Det

0dB

dB

0dB 0dB

18
dB

VOX
Det.

18
dB

Latch

Comp

Decoder

D
a
a
a
a
a
a

60

61

62

Line
Supply
Monitor

Power Supply

Control

63

AP

AP

V

REF

Cont.

Hold off

64

0dB

AP

0dB

+
–

DM
Cont.

20

dB

16123456789101112131415

V

CC

I

CC

V

L

I

L

P

D

T

opr

T

stg

Supply voltage (1)
Supply current (1)
Supply voltage (2)
Supply current (2)
Power dissipation

Note)

Operating ambient temperature
Storage temperature

V

mA

V

mA

mW

˚C
˚C

■ Absolute Maximum Ratings (Ta=25˚C)

7.0
50

12.0
135
640

–20 to +75

–55 to +150

Note) In a free-air condition with Ta=75˚C.

Parameter Symbol Rating Unit

■ Recommended Operating Conditions (Ta=25˚C)

Operating supply voltage range (1)
Operating supply voltage range (2)
Clock frequency

V

CC

V

L

f

CLK

4.5
3

5 5.5

11

250

V
V

kHz

Parameter Symbol Condition min typ max Unit

■ Electrical Characteristics (Ta=25˚C)

Speech network block

Rec. gain

G

V

–ER1 34.5 dB

IL=30mA, VCC=5V,
Vin=–42dBm

30.5 32.5

Rec. automatic PAD width

AP–ER 5 dB

IL=30 to 80mA, VCC=5V,
Vin=–42dBm

2.5 3.7

Trans. gain

G

V

–EM1 31.7 dB

IL=30mA, VCC=5V,
Vin=–38dBm

27.7 29.7

Trans. automatic PAD width

AP–EM 5 dB

I

L

=30 to 80mA, VCC=5V,

Vin=–38dBm

2.5 4

DTMF gain

GV–ED1 20.9 dB

IL=30mA, VCC=5V,
DM=ON, Vin=–30dBm

I

L

=30 to 80mA, VCC=5V,
V–DMC=LOW,
Vin=–30dBm

16.9 18.9

DTMF automatic PAD width

AP–EDT 5.5 dB2.5 4.1

REC/PLAY amp. block

Switch block

Head bias current

145I–REC µA

180 215

REC preamp. output

–13.4V

O

–RP dBm

Vin=–45dBm, Rin=10kΩ

–11.4 –9.4

EQ amp. gain

27.8G

V

–EQ dB

Vin=–40dBm

29.8 31.8

SP out max output

0V

O

–SP dBm

Input L-SP IN, THD=5%

4

DH out max output

0V

O

–DH dBm

Input RF1 IN, THD=5%

4

RF1 out max output

0V

O

–RF1 dBm

Input RF2 IN, THD=5%

4

RF2 out max output

0V

O

–RF2 dBm

Input RF1 IN, THD=5%

4

L-REC out max output

0V

O

–LR dBm

Input AUX IN, THD=5%

4

Parameter Symbol Condition min typ max Unit

■ Timing Chart

CLK

DATA

STR

1/f

CLK

t

wh (CLK)

90%

10% 10%

2.5V

90%

2.5V

2.5V

2.5V 2.5V

2.5V

2.5V

t

WL (CLK)

t

r (CLK)

t

f (CLK)

t

su (DATA)

t

h (DATA)

t

su (STB)

t

sr (STB)

t

W (STB)

■ Pin Descriptions

Pin No.

Description
1
2
3
4
5
6
7
8
9

10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32

Ground
Line power (+) input
Side-tone adjustment
Line voltage control (1)
Int. ref. voltage output (1)
Int. ref. voltage output (2)
Hold-reset control
Trans. preamp. output
Auto. PAD control
Rec. preamp. input
Rec. preamp. output
Rec. amp. input
Rec. amp. output (1)
Rec. amp. output (2)
MIC preamp. output
MIC preamp. input (1)
MIC preamp. input (2)
DTMF signal input
BT signal input
Dial mute control
Line voltage control
Line interruption detector output
Hold-reset signal output
No connection
Strobe signal input
Clock signal input
No connection
Data input
Ground
Logic power supply input
VOX detector output
SP link output

Pin No.

Description
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64

RF2 link output
RF1 link output
Intercom link output
VOX detection control
VOX amp. input
Time stamp link output
Recording link output
ALC input
ALC detection control
Loudspeaker link input
Recording input
Recording inverse input
Recording preamp. output
Recording bias current control
To recording head
EQ amp. inverse input
EQ amp. output
REC/PLAY int. ref. voltage output
Ground
MIX preamp. output
MIX link input
AUX preamp. output
AUX link input
Intercom link input
RF1 link input
RF2 link input
Power-ON reset control
External supply voltage input
Internal supply voltage output
Circuit voltage control (2)
Line current bypass (2)
Line current bypass (1)

■ Pin Descriptions

1 GND

2 V

L

I

3 ST

V

L

–

CONT

I

O

4

V

REF

–

SN

HCO

HCC

APC

Vreg-R · I
I

L

T–
FILTER

5 V

REF

O

O

O

I

I

O

O

O

6

7

23

8

9

10

RV IN

RV
PRE

–

OUT

RV
FILTER

RV
OUT
(1)

RV
OUT
(2)

11

12

13

·

14

DescriptionWaveform Remarks

PinNo.

Symbol

I/O Equivalent Circuit

TO

2

3

62

7

30kΩ

120kΩ

+
–

+
–

23

4

8

6kΩ

9

IχI

L

I

10

11

+
–

+
–

10kΩ

11

13

14

12

61

5

6

24kΩ

24

kΩ

Vreg

+
–

+
–

0V

DC
3 to 10V

DC

0.3V

DC1V

1V

(Const)

1V

(Const)

I

L

DC1V

V

REF

V

REF

V

REF

V

REF

V

REF

V

CC

0V

Hold-reset signal

Ground :

• This is the ground pin for the
speech network.

GND for REC/PLY, VRER
SPEECH and LINK.

Side-tone adjustment :

• Grounded through R1 (27Ω).

• Connects to the side-tone adjust­ing circuit to adjust side tone and
receiver level.

Int. ref. voltage output (1) :

• Outputs half the Vreg reference
voltage.

• Grounded through a 0.01µF
capacitor.

Line voltage control (1) :

C

2

and the internal resistance

determine the f. characteristics.

The larger the capacitance
of C10, the lower the high
band gain as with a LPF.

The larger the capacitance of
C

5

, the wider the pulse width.

C6 and the 6-kΩ internal
resistance as illustrated on the
left form a low-pass filter.

The receiver preamplifier
gain (G) is :

The line drive gain (G) is :
Z

Line

//Z

Tel

R

1

Also assuming
Z

Line

600Ω

Z

Tel

600Ω

R1=27Ω :
G=20log =20.9dB

Int. ref. voltage output (2) :

• Output impedance=50Ω

Line power input :

• Connects to the positive output
of the diode bridge.

Hold-reset control :

• Grounded through C5. Adjusts
the output time of control sig­nals.

Hold-reset signal output :

• This is an open-collector out­put to a microprocessor.

• Requires a pull-up resistor.

Trans. preamp. output :

• C

6

as connected between this pin
and the ground forms a low-pass
filter.

Auto. PAD control :

• Connects through a resistance to
Pin61 (Vreg). If the resistance
increases, the PAD operates
closer to the near end. If the
resistance decreases, the PAD
operates closer to the far end.

Rec. preamp. input :

• Receiver signals are input from
the side-tone circuit to this pin.

• R7 and C8 connected between
Pin11 and this pin determine

Rec. preamp. output :

• R7 and C8 connected between
Pin10 and this pin determine
the f. characteristics.

• The output impedance is 100
±50Ω.

Rec. amp. outputs (1 and 2) :

• A ceramic or dynamic receiv­er is connected.

• The output circuit is a BTL con­figuration.

• The output impedance is 50±
30Ω.

Rec. amp. input :

27

300

G= –20log

R7

+ωC8

1

ωC9

R6 +

1

1

G =