Sony CXA1702AR Datasheet

CXA1702AR

4-channel REC/PB Amplifier for 8 mm VCR

Description

The CXA1702AR is a bipolar IC designed as recording/playback amplifiers for Hi8-compatible VCRs.

Features

Recording/playback system

•

• Hi8-compatible wideband recording/playback

amplifier.

• Enables electric variable resistor (EVR) control.

Recording system

•

• Feedback damping provided in the recording

amplifier and its EVR control function facilitate

printed circuit board design.

• Five-input (Y, chroma, AFM, ATF, PCM) mix

amplifier and EVR control function for Y/low-band

recording level.

• Ramp circuit for the recording amplifier output bias

current.

Playback system

•

• Feedback dumping provided in the playback

amplifier facilitates printed circuit board design.

• Middle-frequency tuner on chip; EVR permits

independent adjustment of its center frequency fo,

Q and boost amount by EVR.

• RF AGC and dropout detection circuit.

Application

8 mm VCR

Structure

Bipolar silicon monolithic IC

Absolute Maximum Ratings (Ta = 25°C)

• Supply voltage VCC 7V

•Operating temperature Topr –10 to +75 °C

• Storage temperature Tstg –65 to +150 °C

• Allowable power dissipation

Operating Condition

Supply voltage VCC 4.75

64 pin LQFP (Plastic)

PD 1010 mW

(when mounted on board)

+0.5 –0.25

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—

E93Z32-TE

Block Diagram and Pin Configuration

CXA1702AR

REC1AOUT

REC1ACNT

CC1CH

REC1BCNT

REC1BOUT

PB1BIN

GND1B

PBDUMP1B

PBDUMP2A

GND2A

PB2AIN

REC2AOUT

REC2ACNT

CC2CH

REC2BCNT

REC2BOUT

PBDUMP1A

PB1AIN

GND1A

MTQ

REC1A

RAMP

REC2A

REC1B

REC2B

XHRFSWP

MTF

RFSWP

PCMOUT

22 21 20 19 18 1723242526272829303132

HEAD

15dB

40dB

REC 1A

REC

RAMP

GEN

REC

RAMP

GEN

REC 1B

HEAD

40dB

15dB

PCMSW1

V/I

PCMSW2

VIDEOSW1

VIDEOSW2

PCMSW3 (6dB)

1CH 2CH

MUTE

GND

1CH

2CH

MUTE

VIDEOSW3 (0dB)

GND

MT (-6dB)

RF AGC

12dB

DOCDE T

AG CDE T

VIDEO

HEAD

REC 2A

REC

REC 2B

HEAD

40dB

15dB

RAMP

GEN

V/I

RAMP

GEN

V/I

15dB

VPSW1

VPSW2

VPSW3

VPSW4

PCM VIDEO

PCM

VIDEO

PCM

YGCA

LOW

GCA

LOW

GCA

49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

BUFF

MTOUT

RP_PB

DOP

DOCDET

RFAGCIN

RFAGCTC

RFAGCOUT

REFV

YLEV

_MTG

LOWLEVEL

YIN

XDECK

CIN

GND2

AFMIN

IR1

GND2B

PB2BIN

VREG

RECPCM

PBDUMP2B

VPPCMIN

VPVTRIN

GND

RECVTR

VG2

PCMIN

PCMREC

ATFIN

AFREC

—2—

CXA1702AR

Pin Description (VCC, VCC2, VCC1CH, VCC2CH=4.75V, Ta=25°C)

Pin voltage

Symbol

No. DC AC

1 AFM IN — 125mVp-p

input

2 GND2 0V — 3 CIN 2.45V 500mVp-p

input

4 XDECK 2.4V —

(when pin is open) H: 4.3 V or more L: 0.6 V or less input

5 YIN 2.45V 500mVp-p

input

Equivalent circuit Description

Input pin for recording AFM

70µ

140

20p

50k

2.45V

signal. Input signal bias should be in the range from 1 V to 3.5 V. Connect to Vcc when the pin is not in use.

GND pin Input pin for recording chroma signal.

140

50k

2.45V

25µ

DECK and NORM switching pin

20µ

100k

140

100k

20µ

2.9V

1.8V

H : NORM (4ch) L: Open :

DECK (2ch)

}

Input pin for recording Y signal.

40µ

6 LOW 1.8V to —

LEVEL 4.75V

input

7T1 — — 8

YLEV_MTG

1.8V to —

4.75V input

140

50k

2.45V

EVR adjusting pin for low-band

270

140

90µ

21k

3.15V

90µ

—

recording signal (chroma, AFM, video path ATF, PCM path ATF) level. Increasing the input voltage lowers the signal level.

Test pin. Set the pin open. EVR adjusting pin for recording Y

270

140

23k

270

14k

signal level and middle tune boost amount. Adjusts the former during recording and the latter during playback. Increasing the input voltage lowers recording Y signal

90µ

3.2V

YLEVEL MTG

100µ100µ

2.8V

level and boost amount.

1.75V

—3—

CXA1702AR

Pin voltage

Symbol

No. DC AC

9T2 — —

10 REFV Hi8:4.45V

Nor:3.6V input

11 RFAGC 1.9V 400mVp-p

OUT output

Equivalent circuit Description

Test pin. Connect decoupling capacitance between this pin and GND. EVR adjusting pin to decide the

270

140

60k

15k

adjustment range of middle tune fo. Input the following: Hi8: 4.45 V Nor: 3.6 V

40µ

3.25V

Output pin for playback Y signal.

40µ

12 RFAGCTC 2.5V to —

4.75V input (during EVR adjustment)

13 RFAGC — 220mVp-p

IN input

14 DOCDET 2.55V —

(when pin is open)

600µ

410µ

RFAGC time constant pin.

4700p

470k

140

RFAGCTC

RFAGC gain may be adjusted by

50µ

25µ 25µ

EVR. Increasing the input voltage increases gain. Input pin for playback Y signal. Playback Y signal is separated from playback video signal output to Pin 17 (MTOUT), then input to Pin 13 (RFAGCIN). Set input signal bias in the range from 1 V

140

13p

50k

3.25V

50µ

to 3.5 V. Connect to Vcc when this pin is not in use. Pin for deciding dropout detection level. Connect decoupling capacitance between this pin and

26.5k

140

42.5k

4.15V

50µ

GND. For adjustment, input voltage proportional to Pin 52 (VREG) output voltage. Increasing the input voltage increases the detection level.

—4—

CXA1702AR

Pin voltage

Symbol

No. DC AC

15 DOP H: 3.15V —

L: 0V output

16 RP_PB H: 2.3V —

or more L: 0.6V or less input

17 MTOUT 2.4V 220mVp-p

(playback Y signal) output

Equivalent circuit Description

Output pin for dropout detection

150

signal. Goes High at the time of dropout.

35µ

2.15V

Input pin for REC/PB switching

50k

5.4k

signal. H : PB L : REC

3.15V

2.4k

1.3m

140

Output pin for playback video

40µ

signal.

18 Vcc2 4.75V —

19 PCMOUT 1.95V 220mVp-p

output

20 MTF0 1.8V to —

4.75V input

400µ

330µ

Power supply pin. Output pin for playback PCM

3.5k

360µ

25µ

240µ

signal.

EVR adjusting pin for middle tune

270

140

40µ

30k

40µ

11k

2.85V

fo. Increasing the input voltage increases fo.

1.7V

—5—

CXA1702AR

Symbol

Pin voltage

Equivalent circuit Description

No. DC AC

21 XHRFSWP H: 2.3V —

or more L: 0.6V or less input

140

22 RFSWP H: 2.3V — Same as for Pin 21

or more L: 0.6V or less input

23 REC2B H: 2.3V — Same as for Pin 21

or more L: 0.6V or less input

24 REC2A H: 2.3V — Same as for Pin 21

or more L: 0.6V or less input

25 REC1B H: 2.3V — Same as for Pin 21

or more L: 0.6V or less input

26 VCC 4.75V — —

27 REC1A H: 2.3V — Same as for Pin 21

or more L: 0.6V or less input

28 RAMP H: 2.3V — Same as for Pin 21

or more L: 0.6V or less input

29 MTQ 1.8V to —

4.75V input

140

270

37.5k

12.5k

35µ

Input pin for 1/2RFSWP signal.

2.15V

Input pin for RFSWP signal.

Goes L during recording and turns on 2Bch recording amplifier output bias current.

Goes L during recording and turns on 2Ach recording amplifier output bias current.

Goes L during recording and turns on 1Bch recording amplifier output bias current.

Power supply pin for main blocks excluding recording and head amplifiers. Goes L during recording and turns on 1Ach recording amplifier output bias current.

Goes H during after-recording and turns on recording amplifier output bias current.

EVR adjusting pin for middle tune Q. Increasing the input voltage increases Q.

40µ

—6—

40µ

2.9V

1.8V

CXA1702AR

Symbol

Pin voltage

Equivalent circuit Description

No. DC AC

30 PBDUMP1A 2.6V —

120µ

31 GND1A 0V — —

32 PB1AIN 0.7V 200µVp-p

input

1.2m

1.5V

270

130µ

Dumping adjusting pin for 1Ach head amplifier. Increasing the external resistance reduces the peaking amount.

40µ

PBDUMP1A

GND pin for 1Ach recording and head amplifiers. Playback signal 1Ach input pin.

33 REC1A (19mA (21mAp-p

OUT output) output)

19m

34 REC1A 1.8V to —

CNT 4.75V

270

input

140

52K

40µ

35 Vcc1CH 4.75V — —

36 REC1B 1.8V to — Same as for Pin 34.

CNT 4.75V

input

37 REC1B (19mA (21mAp-p Same as for Pin 33.

OUT output) output)

38 PB1BIN 0.7V 200µVp-p Same as for Pin 32.

input

19K

40µ

Recording signal 1Ach output pin. Open collector.

EVR adjusting pin for 1Ach recording amplifier dumping. Increasing the input voltage increases the peaking amount.

3.15V

Power supply pin for 1Ach and 1Bch recording and head amplifiers. EVR adjusting pin for 1Bch recording amplifier dumping.

Recording signal 1Bch output pin. Open collector. Playback signal 1Bch input pin.

—7—

CXA1702AR

Symbol

Pin voltage

Equivalent circuit Description

No. DC AC

39 GND1B 0V — —

40 PBDUMP1B 2.6V — Same as for Pin 30.

41 PBDUMP2A 2.6V — Same as for Pin 30.

42 GND2A 0V — —

43 PB2AIN 0.7V 200µVp-p Same as for Pin 32.

input

44 REC2AOUT (19mA (21mAp-p Same as for Pin 33.

output) output)

GND pin for 1Bch recording and head amplifiers.

Dumping adjusting pin for 1Bch head amplifier.

Dumping adjusting pin for 2Ach head amplifier.

GND pin for 2Ach recording and head amplifiers.

Playback signal 2Ach input pin.

Recording signal 2Ach output pin. Open collector.

45 REC2ACNT 1.8V to — Same as for Pin 34.

4.75V input

46 VCC2CH 4.75V — —

47 REC2BCNT 1.8V to Same as for Pin 34.

4.75V input

48 REC2BOUT (19mA (21mAp-p Same as for Pin 33.

output) output)

49 PB2BIN 0.7V 200µVp-p Same as for Pin 32.

input

50 GND2B 0V — —

51 PBDUMP2B 2.6V — Same as for Pin 30.

EVR adjusting pin for 2Ach recording amplifier dumping.

Power supply pin for 2Ach and 2Bch recording and head amplifiers. EVR adjusting pin for 2Bch recording amplifier dumping.

Recording signal 2Bch output pin. Open collector.

Playback signal 2Bch input pin.

GND pin for 2Bch recording and head amplifiers.

Dumping adjusting pin for 2Bch head amplifier.

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