BA7357_技术文档

Video ICs

VIF / SIF signal processor

BA7357S

The BA7357S is a multi-format (M, B / G, D / K, and I) VIF / SIF signal processor for television and VCR applications.

It features a built-in sound-trap and band-pass filters, and employs a pulse-count audio detector that does not require

adjustment. This IC reduces external component requirements, and allows space savings.

Applications

•

TVs and VCRs

Features

•

1) Separate-carrier PLL with full synchronous detec-

tion. Excellent DG / DP, CS beat (920kHz) and

cross color. In addition, by pulling down the SIF

input (pin 9) it can be used as an intercarrier.

2) The IF AGC time constant is dual-layered to allow

faster speeds.

The MODE switch can be used to switch the

SOUND filter frequency band to match the transmis-

sion format (M: 4.5, B / G: 5.5, I: 6.0, D / K:

6.5MHz).

6) The audio detector uses a pulse-counter detector

that does not require adjustment, eliminating the

need for a detector coil. Broad S-curve for multiplex

broadcast compatibility.

3) The variable-gain amplifier has excellent linearity to

ensure low distortion, and AGC variance and tem-

perature drift have been minimized.

7) Use of pulse-counter detection and the built-in

SOUND filter means fewer pins, external compo-

nents and adjustment locations are required. The IC

is available in a 22-pin SDIP package and will

enable cost and space savings.

4) Significant improvement in image quality through

use of a filter that reduces CS beat.

5) Built-in SOUND filter (4.5MHz SOUND Trap and

4.5MHz SOUND BPF).

Absolute maximum ratings (Ta = 25°C)

•

Parameter

Symbol

V^CCMax.

Pd^Max.

Topr

Limits

10.5

Unit

V

1

Applied voltage

2

1250

Power dissipation

mW

°C

Operating temperature

Storage temperature

Pin 2 applied voltage

– 15 ~ + 70

Tstg

– 40 ~ + 150

10.5

°C

V^P2Max.

V

1 24Ω resistor connected between VCC and Vreg.

2 Reduced by 10mW for each increase in Ta 1°C over 25°C.

Recommended operating conditions (Ta = 25°C)

•

Parameter

Symbol

VCC9V

Limits

Unit

V

1

Power supply voltage (9V)

Power supply voltage (12V)

8.8 ~ 9.2

2

VCC12V

11.7 ~ 12.3

V

Guaranteed operating power

supply voltage

1

VCC

8.5 ~ 9.5

V

1 24Ω resistor connected between VCC and Vreg.

2 56Ω resistor connected between VCC and Vreg.

1

Video ICs

BA7357S

Block diagram

•

AFTOUT

1

2

EQFLT

VEQO

22

21

20

RFAGC

AGCADJ

AGCFLT

GND1

VIFB

3

PLLFLT

AFTCOIL

Vreg

4

19

18

17

16

15

14

13

12

5

6

PLLCOILA

PLLCOILB

MODE

X5

VIFA

7

GND2

SIF

8

9

AFC

AFOUT

10

VO4.5M 11

IR

2

Video ICs

BA7357S

Pin descriptions

•

Pin No.

1

Pin name

AFTOUT

RFAGC

AGCADJ

AGCFLT

GND1

Function

AFT OUT

2

RF AGC OUT

3

RF AGC delay point adjustment

IF AGC FILTER

4

5

VIF, BIAS GND

6

VIFB

VIF B IN

7

VIFA

VIF A IN

8

GND2

SIF, PLL GND

9

SIF

SIF IN / intercarrier SW

AUDIO detector Filter and A / V mute SW

2nd SIF OUT

10

11

12

13

14

15

16

17

18

19

20

21

22

AFC

VO4.5M

IR

FIilter BIAS resistor ( ± 1%)

AUDIO OUT

AFOUT

X5

Filter system reference frequency oscillator

MODE SW

MODE

PLL COIL B

PLL COIL A

Vreg

PLL oscillator COIL

Vreg

AFT COIL

PLL FLT

VEQO

AFT COIL

PLL phase detect filter

VIDEO OUT after EQ amplifier

EQ Filter

EQFLT

3

Video ICs

BA7357S

Equivalent circuits

•

Pin No. Pin name IN / OUT Standard voltage

Equivalent circuit

Function

VCC

AFT output.

500

Vreg / GND push-pull output.

1k

1

—

1

2

3

AFTOUT OUT

500

GND

V^CC

RFAGC output.

4k

Open-collector output. Gain can be

set using an external resistor

(minimum value of the maximum sink

current of pin 2 is 0.7mA) . Keep the

pin 2 voltage at 10.5V or less.

2

—

RFAGC

OUT

GND

V^CC

RFAGC delay point adjustment.

Connect to GND via a variable

resistor (approx. 100kΩ).

2.7V

(when 100kΩ

resistor

4.5k

AGCADJ

—

4k

connected)

3

1k

25.2k

GND

V^CC

For filter time constant for VIFAGC.

400

5.0V

4

5

AGCFLT

—

4

GND

0V

GND terminal for VIF, AGC and AFT.

GND1

—

VCC and VCC2 in the equivalent circuit diagrams are connected to the Vreg terminal (pin 18).

4

Video ICs

BA7357S

Pin No. Pin name

Standard voltage

Equivalent circuit

Function

IN / OUT

V^CC

Video IF input.

Use with balanced input.

1k

5

7

6

7

VIFB

VIFA

4.2V

IN

5.3k

1k

GND

SIF and PLL GND.

0V

8

9

GND2

—

IN

—

V^CC

15k

Audio IF input.

Can set to intercarrier mode by

pulling down via a 2kΩ resistor.

20k

9

6.6V

SIF

17pF

15k

GND

Terminal for holding the audio

output DC level fixed.

V^CC

Connect to GND via a 4.7µF

capacitor and to Vreg via a 10µF

capacitor to reduce BUZZ.

Set this pin to 0.3V or lower to

apply Audio / Video Mute.

3.5V

2.7V

10

AFC

—

10

40k

GND

V^CC

2nd SIF output.

Connect a Trap to this pin to vary

the Sound Filter characteristics.

The internal impedance is a high

(Approximately) 1kΩ, so connect a

Buffer to output.

11

Sound

Filter

5.2V

11

VO4.5M

—

8k

GND

5

Video ICs

BA7357S

Pin No. Pin name

Standard voltage

Equivalent circuit

Function

IN / OUT

Reference current source for

adjusting the internal filter. Use

connected to GND via a 24kΩ

resistor. Use an accurate resistor

with good temperature characteristics

(e.g. ± 1% metal film).

V^CC

64k

12

2.4V

12

13

14

15

IR

—

500

0.85p

18.7k

GND

Audio signal output. The standard

output in the case of B / G is

520mV^rms(when f = 50kHz). Connect

to GND via a 10kΩ resistor.

V^CC

200

27k

3.2V

5.0V

3.4V

AFOUT

OUT

13

GND

For connection to a 5MHz oscillator

(when M format is used).

V^CC

200

Use as a reference oscillator for

automatic adjustment of the internal

filter, and as the signal for the SIF

signal low frequency conversion.

(B / G, D / K format: 6MHz, I format:

6.5MHz).

X5

—

400

14

GND

V^CC

Input terminal for Trap filter SW.

0V: M format (4.5MHz)

40k

5k

2.4V: D / K format (6.5MHz)

4.3V: I format (6.0MHz)

MODE

IN

15

50k

5k

Vreg: B / G format (5.5MHz)

40k

GND

6

Video ICs

BA7357S

Pin No. Pin name IN / OUT Standard voltage

Function

Equivalent circuit

V^CC

For connection of IF detector

VCO oscillator coil.

200

1k

16

17

PLLCOILA

PLLCOILB

16

17

3.6V

6.6V

3.0V

3.4V

—

GND

IF circuit power supply.

Pin 18 has a built-in shunt

regulator.

18

VIF

SIF

18

19

20

Vreg

GND2

For connection of AFT coil.

To apply AFT defeat, connect to

GND via a 1kΩ (approx.) resistor.

V^CC2

17k

11k

1.5k

AFTCOIL

19

3.9k

GND2

Terminal for time constant circuit

for the PLL filter.

V^CC2

500

3.3V

40k

PLLFLT

20

30k

148k

500

GND2

7

Video ICs

BA7357S

Pin No. Pin name IN / OUT Standard voltage

Equivalent circuit

Function

VIDEO output.

V^CC

250

Output is via the Sound Trap,

B / W noise inverter, and EQ

amplifier. Connect to GND via a

4.7kΩ resistor.

250

2.0V

21

VEQO

OUT

21

(SYNC)

27k

GND

V^CC

EG Filter.

Connect to GND via an LCR

series resonant circuit. R should

be м 1kΩ.

250 250

1k

5.2V

22

EQFLT

—

22

1k

GND

8

Video ICs

BA7357S

Electrical characteristics (unless otherwise noted, Ta = 25°C, VCC = 9V, and P = 38.9MHz)

•

Parameter

Symbol

Min.

Typ.

Max.

Unit

Conditions

Vreg

Supply current

I^CC

—

96

110

7.0

mA

V

Regulated voltage

VIF

Vreg

6.2

6.6

Input sensitivity

V^VO= – 3dB point

VVMin.

V^VMax.

GR

34

100

62

40

110

70

46

—

dBµ

dB

V

Maximum allowable input level

AGC range

V^VO= + 1dB point

V^VO= ± 3dB range

—

Quiescent video output voltage

Video detector output level

Synchronous signal tip voltage

Video output DG

No signal, V^P4= Vreg

V^P21

V^VO

3.9

1.7

—

4.3

2.0

2

4.7

2.4

2.3

8

VP-P

V

V_i= 80dBµ, AM87.5%MOD

100% white video signal

V^P21SY

DG

%

Vⁱ= 80dBµ, AM87.5%MOD

Video output DP

3STEP video signal

DP

—

3

8

deg

33

45

—

M, B / G

D / K, I

Sound trap attenuation

20 LOG (VOS / VO0.2M)

G^VOS

dB

28

45

—

P = 0, P / C = 4, P / S = 14dB

CS beat level

I⁹²⁰

S/N^V

V^WTH

V^WCL

V^BTH

V^BCL

I^P2SI

37

50

—

dB

V

Video output S / N

47

53

—

Vⁱ= 90dBµ, 100% white

White noise threshold voltage

White noise clamping voltage

Black noise threshold voltage

Black noise clamping voltage

RFAGC maximum sink current

AFT

4.7

2.9

1.1

2.6

0.7

5.0

3.0

1.4

2.9

1.2

5.3

3.5

1.7

3.2

—

CW = 70dBµ

frequency variation and pin

21 voltage variation

V

mA

CW = 100dBµ, AGCADJ = 100KΩ

Maximum AFT voltage

Minimum AFT voltage

AFT detection sensitivity

AFT defeat starting voltage

AFT defeat voltage

VPIMax.

V^PIMin.

Sf

6.0

—

6.4

0.3

65

—

0.8

—

V

CW = 38.4MHz

V

CW = 39.4MHz

CW frequency variation

35

—

mV / kHz

V^AFTDET

VIDEF

—

1.2

3.6

V

CW = 38.4MHz

2.9

3.3

PLL

PLL capture range 1

PLL capture range 2

PLL lock range 1

fCU

f^CL

fLU

f^LL

β

0.5

—

+ 0.9

– 0.9

+ 2.0

– 2.0

1.3

—

– 0.5

—

MHz

0.6

—

MHz

CW = 80dBµ

frequency variation

PLL lock range 2

– 0.6

—

MHz

VCO control sensitivity

0.5

kHz / mV

9

Video ICs

BA7357S

Parameter

Symbol

Min.

Typ.

Max.

Unit

Conditions

SIF P = 38.9MHz / 80dBµ S = 33.4MHz / 70dBµ – 12dB (SAW Filter Loss)

Input sensitivity

V^SMin.

VSMax.

V^SO

—

80

350

52

—

24

90

33

—

dBµ

mVrms

dB

%

fm = 400Hz, ∆f = 50kHz

5% distortion

SIF maximum allowable input level

FM detector output level

Audio output S / N

520

64

700

—

fm = 400Hz, ∆f = 50kHz

∆f = 25kHz, AM30%

V^PIO= GND

SN^AF

THD

Audio output distortion

AMR

0.3

56

1.5

—

AMR

V^VMUTE

V^SMUTE

V^IOMUTE

V^9INT

40

—

dB

V

0.7

2.9

—

1.2

3.5

0.3

1.0

MUTE video output voltage

MUTE audio output voltage

MUTE start voltage

2.3

—

V

V^PIO= GND

V

0.1

—

V

Intermode switch voltage

Intermode P = 80dBµ, P / S = 20dB

(use FET probe)

V^VO4.5M

10

20

40

mV_P-P

VO4.5M output level

MODE

V^15M

V15BG

V^15DK

V^15I

—

0

0.5

—

V

REF – OSC = 5MHz

REF – OSC = 6MHz

REF – OSC = 6.5MHz

MODE voltage (M)

MODE voltage (B / G)

MODE voltage (D / K)

MODE voltage (I)

6.0

Vreg

2.40

4.30

2.20

4.10

2.60

4.50

10

Video ICs

BA7357S

Measurement circuit

•

220k

39µH

AFTOUT

RFAGC

AGCADJ

AGCFLT

GND1

VIFB

EQFLT

VEQ0

47p

2k

4.7k

5.1k

0.68µ

100k

150

PLLFLT

AFT COIL

Vreg

1k

0.033µ

27

PLL COILA

PLL COILB

MODE

VIFA

GND2

SIF

18p

X5

18p

22p

AFC

AFOUT

1k

VO4.5M

IR

24.0k ( + – 1% )

0.01µ

Fig. 1

11

Video ICs

BA7357S

Application example

•

Vreg

M SW

9V

I SW

D / K SW

V^CC(9V)

ALL OFF B / G

M (7.5k)

5.1k

100

RFOUT

AFT

VEQ0

V^CC(9V)

PLLFLT

PLL

5M

6.5M

MODE

EQFLT

IR

6M

0.01µ

+

Vreg

X5

22

21

20

19

18

17

16

15

14

13

12

EQ

AMP

– 45

SHIFT

REF

OSC

PLL

DET

AF

Vreg

MODE

BIAS

VCO

AMP

B/W

INV

FM

DEMOD

AFT

+ 45

SHIFT

VIDEO

AMP

SIF

TRAP

SIF

SW

SIF

BPF

LIM

VIF

AMP

LIM

VIF

AMP

RF

AGC

IF

AGC

500k

BPF

V^CC

SIF

AMP

VIF

AMP

1

2

3

4

5

6

7

8

9

10

11

AFC

SIF SW

GND2

+

GND1

+

Vreg

VIF IN

SIF IN

IF IN

SAW

FILTER

+

AGCADJ

AGCFLT

Vreg

RF AGC

VO4.5M

AFT OUT

SIF SW

MODE SW

Unit

R: Ω

C: F

SPLIT = FREE / INTER = GND

SIF IN [9pin] DC

STANDARD

M

4.5

0

B / G D / K

I

V / S

C

SPACING

[MHz]

5.5

6.6

6.0

6.5

2.4

6.0

4.3

6.5

MODE [V]

OSC [MHz]

5.0

AT Vreg = 6.6V

Fig. 2

12

Video ICs

BA7357S

Coil specifications

•

f = 38.0MHz

f = 38.9MHz

0236 – JPS – 134

Type name: S-7GC

0236 – JPS – 121

Type name: S-7GC

4 – 6

8T

3

2

1

4

6

3

2

1

4

6

S

VCO

COIL

0.10φ

0.12φ

Tuning capacitance:

22pF RH

Tuning capacitance:

22pF RH

SUMIDA

0236 – JPS – 137

0236 – JPS – 136

Type name: S-7GC

1 – 2 2 – 3

3T

3

4

6

3

2

1

4

6

AFT

COIL

2

1

0.14φ

0.10φ

Tuning capacitance:

56pF RH

Tuning capacitance:

56pF RH

S

SUMIDA

Note: Connect a 16.7pF capacitor between 4 and 6 when measuring in the case of the VCO COIL.

Connect a 0pF capacitor between 1 and 3 when measuring in the case of the AFT COIL.

13

Video ICs

BA7357S

Operation notes

•

(1) Simultaneous audio and video output muting function

It is possible to simultaneously mute the audio and video output by pulling the AFC filter terminal down.

(2) AFT defeat function

AFT defeat can be applied by pulling the AFT coil terminal down via a 1kΩ resistor.

(3) Recommended SIF input range for intercarrier mode

P / S = 20 TO 30dB (including SAWFILTER).

(4) IF input range for RFAGC switching

60 TO 95dBµ.

(5) Intercarrier mode switching

Intercarrier mode can be set by pulling the SIF terminal down via a 2kΩ resistor.

(6) IR terminal external resistor

This resistor sets the filter system reference current, so use an accurate component that has good temperature char-

acteristics.

Electrical characteristic curves

•

1.5

1.25

1.0

1.5

1.4375

IC is not connected.

When mounted on

a glass eoxy board.

1.0

0.5

0

25

50

75

100

125

150

0

25

50

75

100

125

150

TEMPERATURE: Ta (°C)

Fig. 4 Power dissipation

Fig. 3 Power dissipation

14

Video ICs

BA7357S

External dimensions (Units: mm)

•

19.4 ± 0.3

22

12

7.62

1

11

0° ~ 15°

1.778

0.5 ± 0.1

SDIP22

15


型号：	BA7357
厂家：	ROHM
描述：	VIF / SIF signal processor VIF / SIF信号处理器
文件：	总15页 (文件大小：178K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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