Sony CXA2002R Datasheet

– 1 –

Description

The CXA2002R is a bipolar IC developed as

recording/playback amplifiers for Hi8 VCRs.

Features

• Recording/playback system

• Wideband recording/playback amplifier for Hi8

VCR

• Supports electronic volume (EVR) control (3V)

• Recording system

• Recording amplifier feedback dumping circuit and

its EVR control function facilitates printed circuit board design.

• Five-input (Y, chroma, AFM, ATF and PCM) mix amplifier and EVR control function of Y and lowband recording level

• Ramp circuit for the recording amplifier output bias current

• Playback system

• Playback amplifier feedback dumping circuit

facilitates printed circuit board design.

• Middle-band compensation circuit (middle tune) and independent adjustments of the center frequency, Q and boost by EVR

• RFAGC and dropout detection circuits

Absolute Maximum Ratings

• Supply voltage VCC 7V

•Operating temperature Topr –10 to +75 °C

• Storage temperature Tstg –65 to +150 °C

• Allowable power dissipation PD 1100 mW

(when mounted on the printed circuit board)

Recommended Operating Condition

• Supply voltage 4.75

+0.5 –0.25

V

• Vcc EVR voltage 3.15 ±0.15 V

CXA2002R

48 pin LQFP (Plastic)

E95201-ST

2-channel Recording/Playback Amplifier

Application

8 mm VCR

Structure

Bipolar silicon monolithic IC

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.

CXA2002R

– 2 –

Block Diagram

HEAD

REC

V/I

RAMP

GEN

15dB

40dB

VPSW1

VPSW2

PCM

VIDEO

YGCA

1

2

CGCA

LOWGCA

RF AGC

AGCDET

DOCDET

M · T –6dB

12dB

MUTE

2CH

1CH

MUTE

2CH

1CH

PCMSW

VIDEOSW

REC

HEAD

40dB

15dB

V/I

RAMP

GEN

RAMPCONT

RAMP

RFSWP

BOTH REC

RP PB

MTQ

MTF0

MTG

PCMOUT

MTOUT

40

39

38

37

41

42

43

44

45

46

47

48

2

3

4

5

6

7

8

9

10

11

12

1

13

1415

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

36

35

34

31

32

33

VPPCMIN

RECPCM

VPVTRIN

RECVIDEO

VREG

GND

IR1

IR

VG2

PCMIN

PCMREC

ATFIN

CCONT

AFMIN

AFREC

CIN

LOWLEVEL

YIN

YLEVEL

RFAGCOUT

RFAGCTC

RFAGCIN

DOCDET

DOP

V

CC2

REC2CONT

REC2OUT

PB2IN

PBDUMP2

PBDUMP1

GND1

PB1IN

REC1OUT

REC1CONT

V

CC1

GND2

V

CC

V

CC

EVR

PCM

VIDEO

CXA2002R

– 3 –

Pin Description

1 CCONT —

EVR adjusting pin for the recording chroma level. Increasing the applied voltage reduces the gain.

2 AFMIN —

Input pin for recording AFM. DC component is cut by built-in C. Input level: 125mVp-p (typ.)

3 AFREC —

After-recording mode switchover pin (High: Afterrecording) H: 2.3V or above L: 0.6V or below

4 CIN 2.45

Recording chroma input pin. Input after cutting DC component with C. Input level: 300mVp-p (typ.)

1

14350k

10k25k

15k

7k

2

143

20p

70µ

50k

143

35µ

3

35µ35µ

1.5V

143

2.45V

70µ

50k

4

Pin No.

Symbol

voltage

Equivalent circuit Description

CXA2002R

– 4 –

5 LOWLEVEL —

EVR adjusting pin for recording RF. Increasing the applied voltage reduces the gain. Simultaneous adjustment of VIDEO and PCM paths. VIDEO path: C+AFM+ATF

adjustment

PCM path: ATF adjustment

6 YIN 2.45

Recording Y input pin. Input after cutting DC component with C. Input level: 500mVp-p (typ.)

7 YLEVEL —

EVR adjusting pin for the recording Y signal level. Increasing the applied voltage reduces YLEV.

8 RFAGCOUT 2.8

Playback Y signal output pin. Output level: 410mVp-p (typ.)

14350k

10k25k

15k

7k7k

5

143

40µ

50k

2.45V

6

14350k

10k25k

15k

7k7k

7

8

40µ

600µ

410µ

No.

Symbol

voltage

Equivalent circuit Description

CXA2002R

– 5 –

9

RFAGCTC —

Pin to apply time constant of RFAGC. EVR adjustment of RFAGC gain is possible.

Adjustment range:

(

2.5V to 4.75V

)

Gain: Small to Large

10 RFAGCIN —

RFAGC input pin for the playback Y signal. Playback VIDEO signal output to Pin 14 (MTOUT) is input again to Pin 10 (RFAGCIN) via external ATF TRAP, AFM TRAP and C TRAP. DC component is cut by built-in C.

11 DOCDET 2.5

Pin to determine the dropout detection level.

12 DOP

H: 3.15 L: 0

Output pin for the dropout detection signal. High upon dropout.

143

50µ50µ25µ25µ

9

143

50µ

50k

3.25V

10

13p

143

50µ

79k

11

47k

4.15V

12

150

2.4k

1.3m

3.15V

9

Vcc

4700p

470k

Pin No.

Symbol

voltage

Equivalent circuit Description

CXA2002R

– 6 –

14 MTOUT 2.4

Output pin for playback VIDEO signal. Y + C + AMF + ATF is output.

13 VCC EVR 3.15

Power supply pin for EVR block.

15 MTG —

EVR adjusting pin for the middle-tune boost. Increasing the applied voltage reduces the boost.

16 PCMOUT 2 Output pin for playback PCM

17 MTF0 —

EVR adjusting pin to determine middle-tune fo. Increasing the applied voltage increases fo.

40µ

400µ

14

330µ

14350k

10k25k

15k

7k7k

15

40µ

360µ

16

3.5k

310µ

14350k

10k25k

15k

7k7k

17

No.

Symbol

voltage

Equivalent circuit Description

CXA2002R

– 7 –

18

RP PB —

REC/PB switchover pin High: PB 2.3V or above Low: REC 0.6V or below

19 VCC 4.75

Power supply pin for components other than REC amplifier, PB amplifier and EVR.

20 BOTH REC —

EACH REC/BOTH REC switchover pin. High: BOTH REC 2.3V or

above

Low: EACH REC 0.6V or

below

21 RFSWP —

RFSWP input pin. High: 2.3V or above Low: 0.6V or below

22 RAMP —

Pin to turn ON/OFF the REC amplifier bias current during after-recording. The bias current turns ON when this pin goes high. High: 2.3V or above Low: 0.6V or below

18

50k

143

6.1k

35µ35µ35µ

1.5V

143

35µ

1.5V

20

143

35µ35µ35µ

1.5V

21

143

35µ35µ35µ

1.5V

22

Pin No.

Symbol

voltage

Equivalent circuit Description

CXA2002R

– 8 –

23 RAMPCONT —

Ramp pulse rising slope switchover pin. Low: 32µA/µs 0.6V or below High: 17µA/µs 2.3V or above (The fall time is 32µA/µs in both cases.)

25 VCC1 4.75

Power supply pin for CH1 REC amplifier and PB amplifier.

24 MTQ —

EVR adjusting pin to determine middle-tune Q. Increasing the applied voltage increases Q.

26 REC1CONT —

EVR adjusting pin for the CH1 recording dumping level. Reducing the applied voltage strengthens dumping.

27 REC1OUT —

CH1 recording output pin. Open collector.

143

35µ35µ35µ

1.5V

23

143

50k

10k25k

15k

7k7k

24

26

143

270

71k

40µ

34k

66k

27

30

1k

12k

5.7k

No.

Symbol

voltage

Equivalent circuit Description