SANYO LA7578N Datasheet

Ordering number: EN 4952

Monolithic Linear IC

LA7578N

IF Signal Processing (Super PLL-II VIF + SIF)

Circuit for TVs and VCRs

Overview

The LA7578N is an intercarrier-type VIF + SIF IC that
supports excellent sound quality and image quality.
The pin assignment of the LA7578N is identical to that of the
LA7577N, allowing the LA7577N to be used for split systems
while the LA7578N is used for intercarrier systems. In
addition, the LA7578N suppresses Nyquist buzz interference
by using a PLL detection system with a buzz canceller in order
to provide the best sound quality possible.

Functions

[VIF Block]

.

VIF amplifier

.

VCO

.

APC filter

.

B/W NC

.

AFT

.

IF AGC

[SIF Block]

.

Limiter amplifier

[Mute]

.

Audio mute (pin 2)

.

IS-15 switch (pin 13)

.

PLL detector

.

Equalizer amplifier

.

Lock detection

.

RF AGC

.

APC detector

.

Buzz canceller

.

FM quadrature detector

.

AV mute (pin 4)

Package Dimensions

unit : mm

3067-DIP24S

[LA7578N]

SANYO : DIP24S

Features

.

Excellent buzz and buzz-beat characteristics due to PLL
detection system with buzz canceller.

.

Built-in APC time constant switch.

.

Duplicate time constant system suited for high-speed AGC.

.

Excellent DG and DP characteristics.

.

RF AGC adjustment is simple.

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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

81095HA (II)No.4952 - 1/18

LA7578N

Specifications

Maximum Ratings atTa=25°C

Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
Allowable power dissipation Pd max Ta % 50°C 1200 mW
Circuit voltage V

Circuit current I

Operating temperature Topr Note 1 –20 to +70
Storage temperature Tstg –55 to +150

Note : The current that flows into the IC is positive (no signal); the current that flows out of the IC is negative.
Note 1 : –20 to +75°CatV

CC

=9V

Operating Conditions atTa=25°C

Parameter Symbol Conditions Ratings Unit
Recommended supply voltage V
Operating supply voltage range V

Note:.Always turn on the protective resistance when drawing a line directly out from the IC at usage. (Pins 2, 11, 12, etc.)

.

A capacitor with favorable humidity characteristics should be used for pin 13. (ex. OS capacitor)

.

Pin 8 (NC) should always be open.

max 13.8 V

CC

3,V13

V

14
1

I

17

I

21

I

10

CC

op 8.2 to 13.2 V

CC

V

CC

V

CC

–1 mA

–10 mA

–3 mA

3mA

9or12 V

V
V

°

C

°

C

Operating Characteristics atTa=25°C, VCC=12V

Parameter Symbol Conditions min typ max Unit
[VIF Block]
Circuit current I
No-signal video output voltage V
Maxinum RF AGC voltage V
Mininum RF AGC voltage V
No-signal AFT voltage V
Input sensitivity Vi S1 = OFF 33 39 45 dB/µV
AGC range GR S1 = ON 60 66 dB
Maxinum allowable Input Vi max S1 = ON 100 105 dB/µV
Video output amplitude V
Output S/N S/N S1 = ON 49 55 dB
Sync signal tip voltage V
920 kHz beat level I
Frequency characteristics fc P = 0, S = –14 dB 6 8 MHz
Differential gain DG
Differential phase DP 2 5 deg
Maxinum AFT voltage V
Mininum AFT voltage V
White noise threshold voltage V
White noise clamp voltage V
Black noise threshold voltage V
Black noise clamp voltage V

9

21
10H
10L

14

(video) S1 = ON 1.95 2.25 2.55 Vp-p

O

21

920

14H
14L

WTH
WCL

BTH
BCL

V13=5V,S1=ON 42 48 57 mA
V13=5V,S1=ON 6.6 7 7.4 V
V13= 7 V, S1 = OFF 10.6 11 11.4 V
V13=7V,S1=ON 0 0.5 V
V

13=5V,S1=ON

(tip) Vi = 10 mV, S1 = ON 4.15 4.45 4.75 V

P=0,C=–4dB,S=–14dB,S1=ON 37 43 dB

Vi = 10 mV, 87.5% mod,
fp = 58.75 MHz

S1 = ON 3.4 3.7 4.0 V
S1 = ON 5.3 5.7 6.1 V

3.0 5.9 8.0 V

36%

11 11.5 12 V

0 0.4 1.0 V

8.9 9.3 9.7 V

5.3 5.7 6.1 V

Continued on next page.

No.4037-2/18

LA7578N

Continued from preceding page.

Parameter Symbol Conditions min typ max Unit
AFT detection sensitivity Sf 50 70 100
VIF input resistance Ri (VIF) f = 58.75 MHz 0.8 1.3 1.75 kΩ
VIF input capacity Ci (VIF) f = 58.75 MHz 3.0 6.0 pF
APC pull-in range (U) f
APC pull-in range (L) f

VCO maximum variable range
VCO control sensitivity β V

-2 S1 = ON 0.6 1.6 MHz

PU

-2 S1 = ON –1.6 –0.8 MHz

PL

∆f
∆f

V

U

L

18=3V,S1=ON

V

18=7V,S1=ON
18=5Vto4.6V

0.6 1.6 MHz
–1.6 –0.8 MHz

1.5 3.1 6.2

SIF output signal voltage VO(SIF) P/S = 20 dB 120 170 240
[SIF Block] : V13=5V
SIF limiting sensitivity Vi (lim) 33 39 dB/µV
FM detection output voltage V

O

400 600 790
AMR AMR 40 49 dB
Distortion THD 0.5 1.0 %
SIF S/N S/N (SIF) 60 78 dB
[Mute Defeat]
AFT defeat start voltage VD
AV mute V
FM mute V
AFT defeat voltage VD

11
4TH
2TH

14

0.5 2.3 V

0.5 1.9 V

0.5 2.0 V

5.4 6 6.6 V

mV/kHz

kHz/mV

mVrms

mVrms

Operating Characteristics atTa=25°C, VCC=9V

Parameter Symbol Conditions min typ max Unit
[VIF Block]
Circuit current I
No-signal video output voltage V
Maxinum RF AGC voltage V
Mininum RF AGC voltage V
No-signal AFT output voltage V

9

21
10H
10L

14

Input sensitivity Vi S1 = OFF 37 43 49 dB/µV
Video output amplifude V
Sync signal tip voltage V
Maximum AFT voltage V
Minimum AFT voltage V
White noise threshold voltage V
White noise clamp voltage V
Black noise threshold voltage V
Black noise clamp voltage V

(video) S1 = OFF 1.5 1.75 2.0 Vp-p

O

21

14H
14L

WTH
WCL

BTH
BCL

AFT detection sensitivity Sf 30 43 60
SIF output signal voltage VO(SIF) P/S = 20 dB 90 130 180
[SIF Block]
FM detection output voltage V
[Mute defeat voltage]
AFT defeat start voltage VD
AV mute V
FM mute V

4TH
2TH

AFT defeat voltage VD

V13=5V,S1=ON 36 41 49 mA
V13= 5 V, S1 = ON 5.0 5.4 5.8 V
V13= 7 V, S1 = OFF 7.6 8 8.4 V
V13=7V,S1=ON 0 0.5 V
V13= 5 V, S1 = ON 2.6 4.5 6.0 V

(tip) Vi = 10 mV, S1 = ON 3.25 3.55 3.85 V

8 8.5 9.0 V

0.3 1.0 V

6.8 7.2 7.6 V

4.0 4.4 4.8 V
S1 = ON 2.5 2.8 3.1 V
S1 = ON 3.7 4.1 4.5 V

mV/kHz

mVrms

V13= 5 V 400 600 790

O

11

0.5 1.6 V

mVrms

0.5 1.1 V

0.5 1.9 V

14

3.9 4.5 5.1 V

No.4037-3/18

Sample Application Circuit (JAPAN)

LA7578N

Unit (resistance : Ω, capacitance: F)

Pins 22 and 23 are grounded inside the IC.

No.4037-4/18

Sample Application Circuit (JAPAN)

When using no SIF, 1stSIF, AFT, RFAGC.

LA7578N

1. When using no SIF circuit:
Pin1 = Open
Pin2 = GND
Pin24 = Open

2. When using no AFT circuit:
Pin11, 12 = GND
Pin14 = Open

3. When using no RFAGC circuit:
Connect a capacitor of 0.01 µF across Pin 4 and GND.
Pin10 = Open

Unit (resistance : Ω, capacitance : F)

No.4037-5/18

LA7578N Interface Circuit

LA7578N

Unit (resistance : Ω, capacitance : F)

No.4037-6/18