Sony CXA1737R Datasheet

CXA1737R

AFM Stereo Signal Processor for 8 mm VCR

Description

The CXA1737R is a bipolar IC designed as an

AFM stereo signal processor for 8mm VCR.

All functions necessary for AFM stereo are

concentrated onto a single 64-pin LQFP.

Features

• Low supply voltage (3.15V) design

• Low power consumption (Vcc = 3.15V)
Recording: 150mW
Playback: 240mW

• Built-in BPF (1.5MHz, 1.7MHz)

• Supports NTSC and PAL

• Enables both parallel and 3-line serial mode control

• Supports electronic volume (EVR) control

Structure

Bipolar silicon monolithic IC

Applications

8mm VCRs

64 pin LQFP (Plastic)

Absolute Maximum Ratings

• Supply voltage VCC 5.25 V

• Operating temperature Topr –20 to +75 °C

• Storage temperature Tstg –65 to +150 °C

• Allowable power dissipation

PD 1500 mW

Operating Conditions

• Recommended supply voltage

VCC 3.15 V
VCCH 4.75 V

• Supply voltage range VCC 3 to 5.25 V

VCCH 4.5 to 5.25 V

Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.

– 1 –

E96Z11A77

Block Diagram

CXA1737R

LINEO L

EPOUT L

GNDH

EPLINEOUT R

MUTEOUT

V

MIXOUT

V

PMUTETC

MIC/LINE (CS)

REC/PB (CK)

LINE MIX ON/OFF(SI)

VCT5

MICIN L

V

LINEIN L

37

MONI L

AFLIM

LIM

LIM

AFLIM

DEVADJ L

36

PBREC

PBREC

LPF

PHASE

COMP

PHASE

COMP

LPF

MUTE

NC

35

DOC
DET

1.5MHz
VCO

LIM

MONO

LIM

1.7MHz
VCO

MUTE

DET

MUTE OFF

DELAY

PLLLPF L

34

OFF

LPF

1.5M

1.7M

1.7MHz
BFPRFAGC

1.5MHz
BFP

FWR

OUTSEL CTL (P.SAVE)

33

PLL L

MIX

PLL R

ONREC

MONO

DET

32

MATRIX CTL

RFSWP

31

NC

30

FSCIN

29

NTSC/PAL

28

27

MUTETC

26

BPF ADJ

VCT

25

RECFMOUT

24

BPFMONI

23

PBRFIN

22

RFAGCTC

21

MONOOUT

20

PLLLPF R

19

18

MONO DET

SI/PA (SP/LP)

17

PG

TCH L

39

DEC OUT
DEC IN

ENC OUT
ENC IN

TC L

38

NR R

45

L-OUT

R-OUT

REC

PB

PB

REC

REC

REC

NC

R-IN

PB

PB

SHTC L

44

PBREC

LPF

LPF

MUTE ON/OFF

48

LINE Lch

LINE

E.P.

E.P./
LINE

MUTE

MIX

CONTROL

BUS

DECODER

MIC

LINE

MIX

LINE

MIC

49

50

51

52

53

POWER

MUTE

CCH

54

55

CC2

56

57

58

59

60

61

62

63

CC1

64

OFFON

OUTSEL

ALC

DET

ALC

46

47

MUTE

MUTE

MATRIX

L-IN

PBREC

D.C.

D.C.

FADE

FADE

SHTC R

DC R

WEIGHT L

VCTH

43

42

DEC IN
DEC OUT

ENC IN
ENC OUT

REC

PB

PB

REC

41

NR L

LPEMP

S/H

S/H

LPEMP

NRDC L

GND2

40

LP

D.C.

MUTE

SP

OR

DOUB

SP

D.C.

MUTE

LP

1

ALCDET

2

LINEIN R

4

3

FADE

MICIN R

IFDC R

IREF

7

RFDC L

6

5

8

RFDC R

9

IFDC L

10

11

GND1

WEIGHT R

12

NRDC R

13

TCH R

14 15

TC R

MONI R

16

DEVADJ R

– 2 –

CXA1737R

Pin Description (VCC1, VCC2 = 3.15V, VCCH = 4.75V, Ta = 27°C)

Pin

No.

Symbol Equivalent circuit Description

1 ALCDET

2 LINEIN R

Pin voltage

DC AC

——

1.23V

Reference
input
–38dBm

∗

1

Vcc1

2µ

ALC time constant pin.

250500

1

1k

Vcc1

ALC is OFF when this pin is
low.

GND

Line input pin. Standard input

5µ

level: –38dBm.
This pin has a small input

2

147

50k

signal level and high input
impedance. Therefore, be
careful not to cause cross

VCT = 1.23V

GND

talk with other signals.

3 FADE

4 MICIN R

See
Graph 1.

1.23V

—

Reference
input
–38dBm

∗

1

Vcc1

20µ

EVR control pin for fader.
0 to 0.5V with fixed gain.

3

50k

50k

Increasing the applied
voltage lowers the gain and
causes the fader to operate.

1.24V
GND

Vcc1

Microphone input pin.

5µ

Standard input level: –38dBm.
This pin has a small input

4

147

50k

signal level and high input
impedance. Therefore, be
careful not to cause cross

VCT = 1.23V

GND

talk with other signals.

– 3 –

∗1

0dBm = 2.19Vp-p

CXA1737R

Pin

No.

Symbol Equivalent circuit Description

5 IFDC R

6 IREF

Pin voltage

DC AC

1.90V —

1.17V —

VccH

DC monitor pin of Rch signal

5

1k

40k

40µ

GND

Vcc1

path.

Pin for generating the
reference current. Connect a

192

6

192

GND

47kΩ external resistor to
GND. Be careful not to cause
pin cross talk.

7 RFDC L

8 RFDC R

1.91V —

1.91V —

Vcc1

26.8k

DC monitor pin of Lch signal
path.

7

8

1k

26.8k

1k

60µ

GND

Vcc1

DC monitor pin of Rch signal
path.

60µ

GND

– 4 –

CXA1737R

Pin
No.

Symbol Equivalent circuit Description

9 IFDC L

10 GND1

11 WEIGHT R

Pin voltage

DC AC

1.90V —

∗1

0V

—

1.23V —

11

VccH

9

1k

40k

40µ

GND

—

VCC1

5µ

DC monitor pin of Lch signal
path.

Audio system GND pin.

NR WEIGHT time constant

4.7k

pin.

12 NRDC R

1.73V —

12

147

1k

GND

VCC1

5µ
GND

DC offset cancel pin of NR
block.

∗

1

Externally applied voltage

– 5 –

CXA1737R

Pin
No.

Symbol Equivalent circuit Description

Pin voltage

DC AC

13 TCH R 0.56V —

14 TC R 1.19V —

13

14

147

150

10µ

1k

200

VCC1

GND

2µ

NR attack/ recovery time
constant pins.

15 MONI R

16 DEVADJ R

1.89V

See
Graph 4.

Reference
output
–15dBm

∗

1

—

15

16

60k

47k

3k

50k

1k

VCC1

Pin for monitoring the signal
before modulation during
recording and after
demodulation during
playback of Rch.

30µ
GND

VCC1

Deviation adjusting pin.
The variable width is from
0 to Vcc.

20µ

GND

– 6 –

∗1

0dBm = 2.19Vp-p

CXA1737R

Pin

No.

17

Symbol Equivalent circuit Description

SI/ PA
(SP/ LP)

18 MONO DET

Pin voltage

DC AC

——

2.47V —

17

18

147

50k

1k

SP/LP

1.5V

20µ

10µ

during MONO
2µ

during MONO

0.5µ

10k

VCCH

4V

GND

SI/PA SW

VCC1

Serial/ parallel (SP/ LP) mode
switching pin. When this pin
is 4.3V or more, the IC
operates in serial control
mode and mode control for
the IC is performed by CS,
CK and SI of Pins 58, 59 and

60. When this pin is 3.5V or
less, the IC operates in
parallel control mode as
follows.

L (0 to 1V) LP
H (2 to 3.5V)

or OPEN

SP

MONO DET time constant
pin.

19 PLLLPF R

——

19

0.08µ

0.08µ

1k

25k

10µ

GND

VCC2

GND

PLL time constant pin. Since
this pin has a small attraction
and discharge current,
signals should be received
with high impedance when
monitoring this pin. Also, be
careful not to cause pin cross
talk.

– 7 –

CXA1737R

Pin
No.

Symbol Equivalent circuit Description

20 MONOOUT

Pin voltage

DC AC

——

20

MONODET OUT

5k

5k

STEREO: H
MONO: L

VCC1

1V

20µ

GND

Bil Rec CTL IN

MONODET discrimination
output pin. This pin is open
collector, and it is pulled up to
Vcc with 100kΩ resistor.
During parallel mode, this pin
is also recording bilingual
control input pin.

• Specification for parallel CTL
During recording:

Bilingual recording
mode when this pin
is set to low (0 to 1 V)
during low of Pin 32
(REC MONO mode).

During playback:

Outputs MONO
discrimination result.
Open for MONO;
Low for others.

• Specification for serial CTL
See Mode Control Tables of

3) SO control mode table.

21 RFAGCTC

22 PBRFIN

2.48V —

—

Reference
input AFM
15mVp-p
(1.5MHz)

21

22

VCC – 1.1V

V

CC – 1.15V

17k147

1k

17k

50µ

VCC2

RFAGC time constant pin.

40µ
GND

VCC2

Input pin for PB RF signal.
The reference input level is
approximately 200mVp-p
(Y + C + AFM).
Note that the reference input
level of AFM 1.5MHz
component is 15mVp-p.

GND

– 8 –

CXA1737R

Pin

No.

Symbol Equivalent circuit Description

23 BPFMONI

24 RECFMOUT

Pin voltage

DC AC

During

1.5M BPF
monitor­ing

1.09V
During

1.7M BPF
monitor­ing

2.51V

0.96V

Reference
output

1.5M BPF
= 180mVp-p

1.7M BPF
= 190mVp-p

1.5M + 1.7M
reference
output

24

1.5M BPF OUT 100

23

1.7M BPF OUT

100

220µ

VCC2

GND

VCC2

GND

This pin is for measurement
which monitors the BPF
output.
For monitoring 1.5M BPF
characteristics, connect 4.7kΩ
resistor to GND.
For monitoring 1.7M BPF
characteristics, connect 4.7kΩ
resistor to Vcc.

Recording FM modulated
output pin. Reference output
is 220mVp-p for 1.5M
component; 175mVp-p for

1.7M component.

25 VCT

26 BPF ADJ

1.89V —

See
Graph 2.

—

25

26

60k

60k

23k

1k

47k

73k 73k

47k

23k

20µ

VCC1

IC internal bias pin. Connect
a decoupling capacitor.

50µ

GND

VCC2

Pin for varying the BPF fo.
The variable width is 0 to Vcc.

20µ

GND

– 9 –

CXA1737R

Pin

No.

Symbol Equivalent circuit Description

27 MUTETC

28

NTSC/ PAL

Pin voltage

DC AC

2.43V —

——

28

27

50k

1k

during DOC

0.6µ
during DOC

2.5µ
10k

40µ

1.5V

VCC1

10µ

GND

VCC1

GND

Time constant pin for
determining the MUTE OFF
delay time.
MUTE ON when drop out (T)
continues approximately 1ms
(during 680pF externally).

Pin 22 input

Pin 27

T

VTH
MUTE ON

NTSC/PAL switching pin
during parallel mode.

L (0 to 1V)

PAL

H (2V to VCC) NTSC

29 FSCIN

1.68V

Reference
input
200mVp-p

30 NC ———

31 RFSWP

—

Reference
input
30Hz

31

29

147

V

CC – 1.4V

147 50k

40k

110k

1.2V

VCC2

fsc input pin.
The input level is
approximately 200mVp-p.
During NTSC: 3.579545MHz
During PAL: 4.433619MHz

20µ

GND

VCC1

RFSWP input pin.

H (2V to Vcc)

L (0 to 1V)

30Hz

GND

– 10 –

CXA1737R

Pin

No.

32

33

Symbol Equivalent circuit Description

Pin voltage

DC AC

MATRIX control input pin
during parallel mode.

VCC1

During parallel

REC

MONO

STEREO

CC)

STEREO

MATRIX CTL

——

32

147 50k

50k

10µ

Pin 32

L (0 to 0.7V)

2V

1V1.5V

10µ

GND

M (1.3 to 1.7V)
or OPEN

H (2.3V to V

OUTPUT SEL control input

OUTSEL CTL
(P.SAVE)

VCC2

——

GND

33

147 50k

50k

10µ

10µ

1V1.5V

BPF OFF
P.SEVE

4V

CTL SW

10µ

pin during parallel mode.

Pin 33
L (0 to 0.7V)
M (1.3 to 1.7V)

or OPEN

2V

H (2.3 to 3.5V)

H2 (4.3V to V

CCH)

During
serial

PB

Bilingual/
MONO Auto

STEREO/
MONO Auto

STEREO

Lch/ Rch

Lch/ Rch (Main)

Lch/ Rch (SUB)
Power save

1.5M BPF through

REC
MONO

—

—

Mode

34

PLLLPF L

35 NC

DEVADJ L

36

1.75V —

——

See
Graph 3.

—

34

36

0.08µ

60k

0.08µ

1k

47k

3k

50k

25k

20µ

VCC2

GND

VCC1

GND

PLL time constant pin. Since
this pin has a small attraction
and discharge current,
signals should be received
with high impedance when
monitoring this pin. Also, be
careful not to cause pin cross
talk.

—

Deviation adjusting pin.
The variable width is from
0 to Vcc.

– 11 –