stv5715.pdf

STV5715

ADVANCED 2-HEAD

PLAY-BACK AND RECORD AMPLIFIER FOR VCR

. LOW NOISE AND WIDE BAND AMPLIFIERS

FOR 2 HEADS

. ONE PLAY-BACK OUTPUT WITHOUT AGC

. RECORD AMPLIFIER INHIBITION AND RE-

CORD OUTPUT GROUNDED

. OUTPUT FOR TRACKING VIDEO INFORMA-

TION (TRIV) WITH ADJUSTABLE GAIN

SO20 LARGE

(Plastic Micropackage)

. ONE INTEGRATED I/I CONVERTER WITH

ACCURATE CONTROL OF TRANSCONDUC-

TANCE

RECORD MODE

ORDER CODE : STV5715

. AUTOMATIC PLAY-BACK/RECORD SWITCH-

ING BY SCANNING OF RECORD SUPPLY

PIN DESCRIPTION

GND1

GND3

REC

TRIVADJ

CCAS

V MES

SW M

OUT

SW H

GND2

CHROMA

V IN

LUMA

V CC

TRIV

CAGC

DESCRIPTION

The STV5715 is an advanced two head record and

play-back amplifier for VCR.

November 1993

1/9

PLAY-BACK MODE

. AUTOMATIC OFFSET CANCELLATION BE-

TWEEN THE 2 SELECTED HEADS

. ONE PLAY-BACK OUTPUT INCLUDING AGC

. PLAY-BACK LOOP INHIBITION

STV5715

BLOCK DIAGRAM

STV5715

LSP

SW H

SW M

HLP

TRIVADJ

FUNCTIONAL DESCRIPTION

STV5715 is intended for 2 heads VCR applications.

It includes all the electrical functions necessary to

achieve play-back and record processing for VHS

and S-VHS applications (10MHz bandwidth).

High performancetechnologyallows very low noise

levels (current and voltage), which are frequency

independant in all the frequency range. In play-

back mode a special feature suppresses the DC

offset when switching the two channels. Optimized

play-back output stage gives to the STV5715 large

capability to drive directly a coaxial cable in order

to reduce number of external components.

Two play-back outputs are availabe : one, dedi-

cated to Chroma processing, is a 60dB voltage

amplifier output, the other, dedicatedto Luma proc-

essing, is phase opposite signal with a constant AC

output level of 200mV PP at 3.8MHz signal.

A tracking information for video signal (TRIV) is

Luma amplitude proportional and allows automatic

6dB) of the TRIV function for all the

channels by applying a bias on pin TRIVADJ.

An automatic scanning of record supply voltage

permits STV5715 automatically switching either in

play-back or in record mode. The switching thresh-

old voltage is fixed to a value which forbids high

current peaking through the heads.

During play-back mode, record output is grounded

via an internal transistor and during record mode

preamplifiers are turned off.

There is one output current for two recording

heads, the DC current and the AC characteristics

can be very precisely controlled with accurate ex-

ternal resistors. If recommended resistances are

used, a ± 3% transconductanceaccuracy is guar-

anteed.

STV5715 is fully protected against ESD.

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

V CC

Power Supply Voltage

V REC

Power Supply Voltage Record

T J

Junction Temperature

+150

o C

T oper

Operating Temperature

0, +70

o C

2/9

phase correction. The transfer function has a gain

of 2.5dB higher when a LP channel is selected.

Adding to this, a gain control bloc allows to modify

the gain (

STV5715

THERMAL DATA

Symbol

Parameter

Value

Unit

R th (j-a) Junction-ambient Thermal Resistance

Typ.

o C/W

RECOMMENDED OPERATING CONDITIONS (T amb =25 o C)

Symbol

Parameter

Min. Typ. Max. Unit

V CC

Power Supply Voltage

4.5

5.5

V REC

Power Supply Voltage Record

4.75 11.3 12.6

CAGC Capacitance at Pin CAGC

4.7

ELECTRICAL OPERATING CHARACTERISTICS (T amb =25 o C unless otherwise specified)

Power Consumption

Parameter

Play-Back

Record (1)

Typ.

Max.

Typ.

Max.

V CC

42mA

52mA

25mA

38mA

V REC

0mA

25mA

33mA

Total

Consumption (2)

V CC =5V,V REC = 9V

210mW

350mW

V CC = 5.5V, V REC = 9.45V

286mW

521mW

Notes : 1. R1 = 18 W

2. Taking in account only the consumption through the IC.

A great care should be taken to the maximum power consumption : V REC can be increased to 12.6V if the DC current flowing

through the head is reduced. This can be done by increasing R1 value. V REC can be reduced as long as voltage on Pin

I OUT does not fall below 1V (to avoid output stage saturation).

Play-back Mode

V CC = 5V, no load on Pins CHROMA,LUMA

Symbol

Parameter

Test Conditions

Min. Typ. Max.

Unit

I CC1

Supply Current

CHROMA OUTPUT (no AGC)

G PB

Pre-amplification Gain

Sinewave 600 kHz, 400mV PP on output

Input on Pin H1 or H2

D G PB1 Difference of Output Signal on

Pin CHROMA between Channel

1 and Channel 2

Sinewave 600kHz

0.4mV PP on inputs H1 and H2

-1.2

1.2

e N

Equivalent Input Voltage Noise

Level

Input grounded via switching transistor

on Pins H1, H2, f = 600kHz

0.6

⁄```

i N

Equivalent Input Current Noise

Pins H1, H2

1.7

⁄```

CRT

Crosstalk

V PP on input,

All the other inputs loaded with R g =15

-45 -40

R PB

Playback Switch-on Resistance

I = 10mA

2.0

5.0

Bandwidth Cut-off Frequency

-3dB attenuation 50

in parallel on the

input, 0dB at 600kHz

F LCPB1

F HCPB1

Low

High

0.1

MHz

13.5

C IN

Input Capacitance Pins H1, H2

At 5MHz

R IN

Pre-amplifier Input Resistance

Pins H1, H2

At 3.8MHz

400 600 900

Z CPB Output ImpedancePin CHROMA DC

3/9

Sinewave 3.8MHz, 400

STV5715

ELECTRICAL OPERATING CHARACTERISTICS (T amb =25 o C unless otherwise specified) (continued)

Play-back Mode

V CC = 5V, no load on Pins CHROMA,LUMA

Symbol

Parameter

Test Conditions

Min. Typ. Max. Unit

CHROMA OUTPUT (no AGC) (continued)

V DCPB1 DC Level at Play-back Output

on Pin CHROMA

1.5

1.9 2.3

V DC Head Switch Offset Pin CHROMA

-100

100

SH PB1 Second Harmonic Play-back Output

Pin CHROMA

Sinewave 3.8MHz

400

V PP on input

-45 -40

LUMA OUTPUT (with AGC)

Z LPB

Output Impedance

V DCPB2 DC Level

1.1

1.5 2.1

Bandwidth Cut-off Frequency

in parallel on the

input, AGC locked, 0dB at 3.8MHz

Low

High

F LCPB2

F HCPB2

10 12.5

0.1 MHz

MHz

V LPB

Output Amplitude

Input signal 200

V PP at 3.8MHz on Pins

140 200 270 mV PP

H1, H2

V LPB AGC Control Sensitivity

Input signal 200

V PP at +6dB or -5dB on

-2

Pins H1, H2

SH PB2 Second Harmonic Play-back Output Input Signal 3.8MHz 400

V PP on Pins

-44 -39

H1, H2

CAGC

I+

Positive Output Current

Input Signal 3.8MHz 200

V PP on H1

I-

Negative Output Current

Input Signal 3.8MHz 200

V PP on H1

-50 -30 -15

TRIV

I TRIV

Downloading Current

200 300 400

V TRIV1 Output Level (1)

With no signal, V TRIVADJ = 2.5V

Mode LP (SW-M = high)

0.3

0.6 1.5

V TRIV2 Output Level (2)

V CHROMA = 100mV PP at 4MHz

V TRIVADJ = 2.5V, Mode LP (SW-M = high)

1.91 2.31 2.91

V TRIV3 Output Level (3)

V CHROMA = 400mV PP at 4MHz

V TRIVADJ = 2.5V, Mode LP (SW-M = high)

3.525 3.725 3.985

V TRIV4 Output Level (4)

V CHROMA = 100mV PP at 4MHz

V TRIVADJ = 1V, Mode LP (SW-M = high)

1.110 1.610 2.311

V TRIV5 Output Level (5)

V CHROMA = 100mV PP at 4MHz

V TRIVADJ = 4V, Mode LP (SW-M = high)

2.875 3.075 3.335

V TRIV6 Output Level (6)

V CHROMA = 400mV PP at 4MHz

V TRIVADJ = 2.5V, Mode SP (SW-M = low)

3.215 3.415 3.675

V TRIV7 Output Level (7)

V CHROMA = 100mV PP at 4MHz

V TRIVADJ = 2.5V, Mode SP (SW-M = low)

1.65 2.05 2.65

f TRIV1 Response Lower Frequency

V CHROMA = 400mV PP at 4MHz and 1MHz

V TRIVADJ = 2.5V, Mode LP (SW-M = high)

-10

-6

-3

f TRIV2 Response Higher Frequency

V CHROMA = 400mV PP at 8MHz and 4MHz

V TRIVADJ = 2.5V, Mode LP (SW-M = high)

-2.5

-1

-0

G TRIV High Level Input

LP : V CHROMA = 100mV PP , 300mV PP at

4MHz, V TRIVADJ = 2.5V

5.5

V/V

4/9

-3dB attenuation 50

STV5715

ELECTRICAL OPERATING CHARACTERISTICS (T amb =25 o C unless otherwise specified) (continued)

Record Mode

V REC = 11.3V, V CC = 5V, Load resistor 50 W on Pin I OUT

Transconductance network defined by : R1 = 18

, 1%

Pins GND/V MES

R2 = 1.5k W , 1%

Pins V MES /V IN

R3 = 1.5k

, 1%

Pin V IN

Symbol

Parameter

Test Conditions

Min. Typ. Max. Unit

I REC

I CC2

Current Supply

V REC = 11.3V

V CC =5V

I max

Max. Record Current

3.8MHz

mA PP

Transconductance

V IN = 300mV PP

65 mA/V

SH REC Second Harmonic

Output Current, 30mA PP at 3.8MHz

at Pin I OUT

-54 -38

Bandwidth Cut-off Frequency Pin IOUT

-3dB attenuation, 0dB at 3.8MHz

Output current 30mA PP

Low

High

F LCR

FHCR

0.1 MHz

MHz

R VIN

Input Resistance on Pin V IN

Equivalent value of R3 resistor

500 700 900

Switching Levels

Symbol

Parameter

Test Conditions

Min. Typ. Max. Unit

V SWHH

Head number 1

2.4

V CC

V SWHL

Head Selection Pin SW-H

Head number 2

1.5

I SWHH

Input current (5V)

I SWHL

Output current (0V)

-50

-20

V SWMH

LP Mode

2.4

V SWML

Mode Selection Pin SW-M

SP mode

1.5

I SWMH

Input current (5V)

I SWML

Output current (0V)

-50

-20

Selection Pin SW-H Transient

Response

Output signal appears on Pin CHROMA

t ON

t OFF

Delay time selection ON

Delay time selection OFF

100

500

V TH1 Inhibition Threshold Hysteresis for

Switching from Play-back to record

on Pin V REC

V CC = 5V

0.15 0.3

0.5

V TH2 Inhibition Threshold Hysteresis for

Switching from Record to Play-back

on Pin V REC

V CC =5V

t 1

Delay from play-back to record

(signal disappears on Pin CHROMA)

t 2

Delay from record to play-back

(signal appears on Pin CHROMA)

32*

Transient Response of Record

Scanning on Pin V REC

t 3

Delay from play-back to record (signal

appears on Pin I OUT )

0.2

t 4

Delay from record to play-back (signal

disappears on Pin I OUT )

11*

m s

* Depending on capacitance on Pin V REC ; above values are according to the application diagram at page 9.

5/9

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