Ordering number : ENN6277

22802TN (OT) No. 6277-1/13

Overview

The LA75676V-S is an NTSC intercarrier VIF/SIF IC that
adopts a semi-adjustment-free structure. In particular, it
uses VCO adjustment to make AFT adjustment
unnecessary and thus simplifies the overall adjustment
process. A PLL-based technique is adopted for FM
detection. The 5 V supply voltage provides compatibility
with other multimedia systems. In addition it achieves
high audio quality by incorporating a built-in buzz
canceller that suppresses Nyquist buzz.

Functions

[VIF]
· VIF amplifier · PLL detector · RF AGC· EQ amplifier
· AFT

· IF AGC

· Buzz canceller

[SIF]
· Limiter amplifier

· PLL FM detector

Features

· No AFT or SIF coils are used, thus eliminating

adjustments.

· Excellent audio performance due to the built-in buzz

canceller.

· V

= 5 V and a low power dissipation of 250 mW.

Package Dimensions

unit: mm

3175B-SSOP24

7.6

7.8

0.5

5.6

0.1

1.5max

0.65

0.22

(0.33)

0.15

(1.3)

SANYO: SSOP24 (275 mil)

[LA75676V-S]

LA75676V-S

SANYO Electric Co.,Ltd. Semiconductor Company

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

VIF/SIF IF Signal-Processing Circuit

for TV and VCR Products

Monolithic Linear IC

Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft's
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.

SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.

100

200

300

400

500

600

100

Pd max -- Ta

When mounted on a 114.3

76.1

1.6 mm

glass epoxy printed circuit board

Ambient temperature, Ta --

Allowable power dissipation, Pdmax -- W

No. 6277-2/13

LA75676V-S

Parameter

Symbol

Conditions

Ratings

Unit

Maximum supply voltage

max

Circuit voltage

V13, V17

Circuit current

I10

I14

Allowable power dissipation

Pd max

70°C,

: Mounted on a PCB.

400

Operating temperature

Topr

20 to +70

°C

Storage temperature

Tstg

55 to +150

°C

Specifications

Maximum Ratings

at Ta = 25°C

: Stipulated PCB: 114.3 x 76.1 x 1.6 mm

, glass epoxy printed circuit board

Parameter

Symbol

Conditions

Ratings

Unit

Recommended supply voltage

Operating voltage range

4.5 to 5.5

Operating Conditions

at Ta = 25°C

Parameter

Symbol

Conditions

Ratings

Unit

min

typ

max

[VIF Block]

Circuit current

Maximum RF AGC voltage

V14H

0.5

Minimum RF AGC voltage

V14L

0.5

Input sensitivity

S1 = OFF

dBµV

AGC range

Maximum allowable input

max

100

dBµV

No-signal video output voltage

3.5

3.8

4.1

Sync signal tip voltage

V6 tip

0.9

1.2

1.5

Video output level

1.7

2.0

2.3

Vp-p

Black noise threshold voltage

BTH

0.5

0.8

1.1

Black noise clamp voltage

BCL

1.6

1.9

2.2

Video signal-to-noise ratio

S/N

C-S beating

IC-S

Frequency characteristics

6 MHz

3.0

1.5

Differential gain

3.0

6.5

Differential phase

deg

No-signal AFT voltage

V13

2.0

2.5

3.0

Maximum AFT voltage

V13H

4.0

4.4

5.0

Minimum AFT voltage

V13L

0.18

1.00

AFT detection sensitivity

mV/kHz

VIF input resistance

45.75 MHz

1.5

VIF input capacitance

45.75 MHz

APC pull-in range (U)

1.3

2.0

MHz

APC pull-in range (L)

2.0

1.4

MHz

AFT tolerance frequency 1

dfa 1

150

+150

kHz

VCO 1 maximum variability range (U)

dfu

1.5

2.0

MHz

VCO 1 maximum variability range (L)

dfl

2.0

1.5

MHz

VCO control sensitivity

1.3

2.7

5.4

kHz/mV

Electrical Characteristics

at Ta = 25°C, V

= 5.0 V, fp = 45.75 MHz

Continued on next page.

No. 6277-3/13

LA75676V-S

Continued from preceding page.

Note: If a wider FM detector output dynamic range is desired, insert a resistor and a capacitor in series between pin 23 and ground to adjust the level.

Pin Assignment

Parameter

Symbol

Conditions

Ratings

Unit

min

typ

max

[SIF Block]

Limiting sensitivity

Vli (lim)

dBµV

FM detection output voltage

(FM)

4.5 MHz ± 25 kHz

400

520

660

mVrms

AMR rejection ratio

AMR

Total harmonic distortion

THD

0.3

0.8

SIF signal-to-noise ratio

S/N (FM)

4.5 MHz output level

Vsout

SIF IN 80 dBµV

101

dBµV

SIF INPUT

BIAS FILTER

SIF OUT

VCC

VIDEO OUT

EQ FILTER

EQ INPUT

APC FILTER

VIDEO DET OUT

VCO COIL

AFT OUT

RF AGC OUT

2nd AGC FILTER

1st AGC FILTER

VIF INPUT

GND

RF AGC VR

BPF-OUT

FM FILTER

FM DET OUT

A13264

LA75676V-S

Top view

AC Characteristics Test Circuit

No. 6277-5/13

LA75676V-S

120

6.8k

100

1.5

100k

7.5k

330

560

150

10k

DET

AGC

VCO

AMP

HPF

VIDEO

DET

AFT

LIM

AMP

9dB

VIF

AMP

0.01

0.47

0.01

)

(D)

(A)

(E)

0.01

1000

24pF

)

(F)

(B)

FM DET OUT

GND

IF AGC

2nd SIF IN

CONV.OUT

(E)

4.5MHzOUT

VIDEO

OUT

VIF IN

RF AGC

OUT

GND

AFT

OUT

A13266

RF AGC

330

10k

100

0.01

A13267

VIF IN

Impedance

analyzer

LA75676V-S

Test Circuit

No. 6277-7/13

LA75676V-S

Pin Functions

Pin No.

Function

Equivalent circuit

SIF input

The input impedance is about 1 k

Since interference signals

entering this input can

result in buzzing and beat signals, the pattern layout
for the signal input to this pin must be designed
carefully.

: Signals that can interfere with audio include video

and chrominance signals. Thus the VIF carrier
signal can cause interference.

SIF input

A13269

The FM detector signal-to-noise ratio can be improved
by inserting a filter in the FM detector bias line.

C1 must be 0.47 µF or higher, and we recommend
1 µF.

If the FM detector is not used, a 2 k

resistor must be

inserted between pin 2 and ground. This stops the FM
detector VCO circuit.

FM power supply filter

A13270

TO VCO BIAS

4.2V

10k

14k

Outputs the intercarrier detector output that has been
passed through a high-pass filter.

(4.5 MHz output)

SIF out

A13271

200

This pin should be left open.

Use lines that are as short as possible for V

/ground

decoupling.

Continued on next page.

No. 6277-8/13

LA75676V-S

Continued from preceding page.

Pin No.

Function

Equivalent circuit

Equalizer circuit

This circuit corrects the frequency characteristics of
the video signal.

Pin 8 is the input to the EQ amplifier. The EQ amplifier
takes a 1.5 Vp-p video signal as its input and amplifies
that to a 2.0 Vp-p level.

· Notes on the equalizer amplifier design

The equalizer amplifier is designed as a voltage
follower amplifier with a gain of about 2.3 dB. If
frequency characteristics correction is required,
insert the capacitor, inductor, and resistor between
pin 7 and ground in series.

· Using the equalizer amplifier

If the input signal is vi and the output signal vo, then

---- +1 (Vi + Vin) = Vo

G: Gain of the voltage follower amplifier

Vin: Imaginary voltage

G: About 2.3 dB

Assuming Vin

0, then AV will be:

VoG

AV = ---- = ---- + 1

R1 is an IC internal 1 k

resistor. Simply select a

value of Z according to the desired characteristics.
However, note that the equalizer amplifier gain will be
a maximum at the Z resonance, so care is required to
prevent distortion from occurring.

EQ amp

2.2k

200

EQ INPUT

EQ OUTPUT

AGC

9.2k

L = Z

A13272

A13273

PLL detector APC filter connection

The APC time constant is switched internally by the IC.
When locked, the VCO is controlled by the route A,
and the gain is reduced. When unlocked or during
weak field reception, the VCO is controlled by the
route B, and the gain is increased.

We recommend the following values for this APC filter:

R = 150 to 390

C = 0.47 µF.

APC filter

FROM
APC DET

A13274

Continued on next page.

No. 6277-9/13

LA75676V-S

Continued from preceding page.

Pin No.

Function

Equivalent circuit

Outputs a video signal that includes the SIF carrier. A
resistor must be inserted between pin 10 and ground
to acquire adequate drive capability.

560

Composit video output

15pF

2pF

A13275

VCO tank circuit for video detection

See the separately provided coil specifications for
details on the tank circuit. This VCO is a vector
synthesis VCO circuit.

VCO tank

A13276

AFT output

This circuit includes a function that controls the AFT
voltage so that it naturally goes to the center voltage
during weak field reception.

A 120 k

bleeder resistor is built in. Note that the

sensitivity can be lowered by attaching an external
resistor.

AFT output

120k

A13277

RF AGC output

This output controls the tuner RF AGC. The internal
circuit includes both a 30 k

pull-up resistor and a

100

protective resistor. Determine the value of the

external bleeder resistor to match the specifications of
the tuner.

RF AGC output

to tuner

A13278

30k

100

Continued on next page.

No. 6277-10/13

LA75676V-S

Continued from preceding page.

Pin No.

Function

Equivalent circuit

IF AGC filter connection

The AGC voltage is created by smoothing the signal
that results from peak detection by the AGC detector
at pins 17 (first AGC), and 15 and 16 (second AGC).
The video signal input to this IF AGC detector is a
signal that was passed through the audio trap circuit.

AGC filter

A13279

4.7k

10k

1.8k

VIF amplifier input

The input circuit is a balanced input, and its input
impedance is due to the following component values.

1.5 k

3 pF

VIF input

A13280

Continued on next page.

GND

RF AGC adjustment

This pin sets the tuner's RF AGC operating point. Both
the FM output and the video output can be muted by
setting this pin to the ground level.

RF AGC VR

20k

560

A13281

4.2V

No. 6277-11/13

LA75676V-S

Continued from preceding page.

Pin No.

Function

Equivalent circuit

Bandpass filter output

The output to the external bandpass filter is passed
through an internal 6 dB amplifier before being output.

BPF-out

A13282

200

Filter that holds the FM detector output DC voltage
fixed.

Normally, a 1 µF electrolytic capacitor is used. If the
low band (around 50 Hz) frequency characteristics are
of concern, this value should be increased. The FM
detection output level can be reduced and the FM
dynamic range improved by inserting the resistor R in
series with the capacitor between pin 23 and ground.

FM filter

A13283

Audio FM detector output
This is an emitter-follower circuit with a 300

resistor

inserted in series.
· Stereo applications

In some application that provide input to a stereo
decoder, the input impedance may be reduced,
resulting in distortion in the L-R signal and degraded
stereo characteristics. If this problem occurs, add a
resistor between pin 24 and ground.
R1

5.1 k

· Mono applications

Construct an external deemphasis circuit.
t = CR2

FM detector output

300

10k

A13284

JAPAN f = 58.75 MHz

US f = 45.75 MHz

PAL f = 38.9 MHz

VCO coil

Prototype no. V291XCS-3220Z

Prototype no. 291XCS-3188Z

Prototype no. 292GCS-7538Z

The Toko Electric Corporation

SAW filter (SPLIT)

Picture TSF1137U Sound

Picture TSF1241 Sound

Picture TSF5315 Sound

SAW filter (INTER)

TSF5220, TSF5221

TSF5321, TSF5344

Notes on Sanyo SAW Filters

There are two types of SAW filters, which differ in the piezoelectric substrate material used, as follows:
· Lithium tantalate (LiTaO3) SAW filter

TSF11

... Japan

TSF12

... US

Although lithium tantalate SAW filters have the low temperature coefficient of 18 ppm/°C, they suffer from a large
insertion loss. However, it is possible, at the cost of increasing the number of external components required, to
minimize this insertion loss by using a matching circuit consisting of coils and other components at the SAW filter
output. At the same time as minimizing insertion loss, this technique also allows the frequency characteristics, level,
and other aspects to be varied, and thus provides increased circuit design flexibility. Also, since the SAW filter
reflected wave level is minimal, the circuit can be designed with a low in-band ripple level.

· Lithium niobate (LiNbO3) SAW filter

TSF52

... US

TSF53

... PAL

Although lithium niobate SAW filters have the high temperature coefficient of 72 ppm/°C, they feature an insertion
loss about 10 dB lower than that of lithium tantalate SAW filters. Accordingly, there is no need for a matching circuit
at the SAW filter output. Although the in-band ripple is somewhat larger than with lithium tantalate SAW filters, since
they have a low impedance and a small field slew, they are relatively immune to influences from peripheral circuit
components and the geometry of the printed circuit board pattern. This allows stable out-of-band trap characteristics to
be acquired. Due to the above considerations, lithium tantalate SAW filters are used in applications for the US and
Japan that have a high IF frequency, and lithium niobate SAW filters are used in PAL and US applications that have a
low IF frequency.

Notes on SAW Filter Matching

In SAW filter input circuit matching, rather than matching the IF frequency, flatter video band characteristics can be
acquired by designing the tuning point to be in the vicinity of the audio carrier rather than near the chrominance carrier. The
situation shown in figure on the right makes it easier to acquire flat band characteristics than that in figure on the left.

· With the tuning set to the IF frequency

· With the tuning set to the vicinity of S and C

No. 6277-12/13

LA75676V-S

A13285

SAW filter characteristics

The high band
response
is reduced

The high band
is extended

Frequency

t=7t

0.12ø
C=24pF

A13288

t=6t

0.12ø
C=24pF

A13287

t=5t

0.12ø
C=24pF

A13286

Coil Specifications

The Toko Electric Corporation 2-1-17 Higashi Yukigaya Ota-ku, Tokyo Telephone: +81-3-3727-1167

PS No. 6277-13/13

LA75676V-S

Notes on VCO Transformer Circuits

· Built-in capacitor VCO transformer circuits

When power is first applied, the heat generated by the IC is transmitted through the printed circuit board to the VCO
transformer. However, the VCO coil frame functions as a heat sink and dissipates the heat from the IC. As a result, it is
relatively difficult to transmit heat to the VCO transformer's built-in capacitor, and drift at power on is minimal.
Therefore, it suffices to design the circuit so that the coil and capacitor thermal characteristics cancel. Ideally, it is
better to use a coil with a core material that has low temperature coefficient characteristics.

· External capacitor VCO transformer circuits

When an external capacitor is used, the heat generated by the IC is transmitted through the printed circuit board directly
to the VCO tank circuit external capacitor. While this capacitor is heated relatively early after power is applied, the coil
is not influenced as much by this heat, and as a result, the power-on drift is larger. Accordingly, a coil whose core
material has low temperature coefficient characteristics must be used. It is also desirable to use a capacitor with
similarly low temperature coefficient characteristics.

Note: Applications that use an external capacitor here must use a chip capacitor. If an ordinary capacitor is used,

problems such as the oscillator frequency changing with the capacitor orientation may occur.

This catalog provides information as of February, 2002. Specifications and information herein are subject
to change without notice.

Specifications of any and all SANYO products described or contained herein stipulate the performance,
characteristics, and functions of the described products in the independent state, and are not guarantees
of the performance, characteristics, and functions of the described products as mounted in the customer's
products or equipment. To verify symptoms and states that cannot be evaluated in an independent device,
the customer should always evaluate and test devices mounted in the customer's products or equipment.

SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all
semiconductor products fail with some probability. It is possible that these probabilistic failures could
give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,
or that could cause damage to other property. When designing equipment, adopt safety measures so
that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective
circuits and error prevention circuits for safe design, redundant design, and structural design.

In the event that any or all SANYO products (including technical data, services) described or contained
herein are controlled under any of applicable local export control laws and regulations, such products must
not be exported without obtaining the export license from the authorities concerned in accordance with the
above law.

No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system,
or otherwise, without the prior written permission of SANYO Electric Co., Ltd.

Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification"
for the SANYO product that you intend to use.

Information (including circuit diagrams and circuit parameters) herein is for example only; it is not
guaranteed for volume production. SANYO believes information herein is accurate and reliable, but
no guarantees are made or implied regarding its use or any infringements of intellectual property rights
or other rights of third parties.

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