SANYO LA7566 Datasheet

Overview

The LA7566 is a VIF/SIF IC that supports PAL and
NTSC multisound and that adopts a semi-adjustment-free
system. To simplify adjustment, the VIF block adopts a
technique in which AFT adjustment is no longer required
by VCO adjustment. The SIF block supports audio multi­detection by adopting a PLL detection technique. The SIF
block provides 4 inputs with IC internal switching for easy
design of multi-sound systems. Additionally, these
switches can also be used for video system sound trap
switching. The LA7566 also includes a buzz canceller that
suppresses Nyquist buzz to achieve improved audio
quality.

Functions

[VIF Block]

• VIF amplifier • PLL detector • BNC • RF AGC

• EQ amplifier • AFT • IF AGC • Buzz canceller
[First SIF Block]

• First SIF amplifier • First SIF detector • AGC
[SIF Block]

• Multiple input switch • Limiter amplifier • PLL FM
detector

Features

• No coils are used in the AFT and SIF blocks, making
these circuits adjustment free.

• PAL / NTSC multisound system can be constructed
easily.

• Built-in buzz canceller for excellent audio performance

Package Dimensions

unit: mm

3067-DIP24S

Monolithic Linear IC

31398HA (OT) No. 5764-1/11

SANYO: DIP24S

[LA7566]

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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

VIF/SIF IF Signal-Processing Circuit with TV/VCR PAL

and NTSC Multisound Support

LA7566

Ordering number : EN5764

Ambient temperature, Ta — °C

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage V

CC

max 10 V

Circuit voltage V7, V9, V10, V17 V

CC

V

I1 –2 mA

Circuit current I13 –3 mA

I18 –10 mA
Allowable power dissipation Pd max 720 mW
Operating temperature Topr –20 to +70 °C
Storage temperature Tstg –55 to +150 °C

Specifications

Maximum Ratings at Ta = 25°C

Allowable power dissipation, Pd max — W

No. 5764-2/11

LA7566

Parameter Symbol Conditions Ratings Unit

Recommended supply voltage V

CC

9 V

Operating supply voltage range V

CC

op 4.6 to 9.5 V

Operating Conditions at Ta = 25°C

Parameter Symbol Conditions

Ratings

Unit

min typ max

[VIF Block]

Circuit current I3 45 53 61 mA
Maximum RF AGC voltage V9H 7.5 8.1 V
Minimum RF AGC voltage V9L 0 0.5 V
Input sensitivity V

IN

S1 = OFF 28 34 40 dBµV

AGC range G

R

45 50 dB

Maximum allowable input V

IN

max 95 100 dBµV
No-signal video output voltage V13 3.7 4.0 4.3 V
Sync tip voltage V13 tip 1.3 1.6 1.9 V
Video output level V

O

1.7 2.0 2.3 Vp-p

Black noise threshold voltage V

BTH

0.7 1.0 1.3 V

Black noise clamp voltage V

BCL

2.0 2.3 2.6 V
Video signal-to-noise ratio S/N 48 52 dB
C-S beat IC-S 44 49 dB
Frequency characteristics f

C

6 MHz –3 –1.5 dB
Differential gain DG 3 8 %
Differential phase DP 3 8 deg
Maximum AFT voltage V10H 7.5 8.5 9.0 V
Minimum AFT voltage V10L 0 0.2 1.0 V
AFT detection sensitivity Sf 29 37 47 mV/kHz
VIF input resistance Ri 38.9 MHz 1.5 kΩ
VIF input capacitance Ci 38.9 MHz 3 pF
APC pull-in range (U) f

PU

1.0 1.5 MHz

APC pull-in range (L) f

PL

–1.5 –0.8 MHz
AFT tolerance frequency 1 dfa1 –500 0 +500 kHz
VCO 1 maximum variability range (U) dfu 1.7 2.0 MHz
VCO 1 maximum variability range (L) dfl –2 –1 MHz
VCO control sensitivity B 1.15 2.3 4.6 kHz/mV

[First SIF Block]

Conversion gain VG 32 35 38 dB

5.5 MHz output level S

O

84 87 90 mVrms

Maximum first SIF input S

IN

max 85 88 91 mVrms

First SIF input resistance R

IN

(SIF) 33.4 MHz 2 kΩ

First SIF input capacitance C

IN

(SIF) 33.4 MHz 3 pF

[SIF Block]

Limiting sensitivity VIi(lim) 43 49 dBµV
FM detector output voltage V

O

(FM) 5.5 MHz ± 30 kHz 390 500 630 mVrms
AM rejection ratio AMR 50 60 dB
Total harmonic distortion THD 0.2 1.5 %
SIF S/N S/N (FM) 55 60 dB

[SIF Switch Block] Switches A, B, and C: H = open, L = ground

NTSC mode 6-dB amplifier NTSW 5 6 7 dB
SIF crosstalk 21 CT21 51 57 dB
SIF crosstalk 22 CT22 51 57 dB
SIF crosstalk 23 CT23 51 57 dB
SIF crosstalk 24 CT24 51 57 dB
Switch threshold low-level voltage SW (L) 1.0 1.5 V

Operating Characteristics at Ta = 25°C, VCC= 9 V, fp = 38.9 MHz

Pin Assignment

No. 5764-3/11

LA7566

Application Circuit Diagram

H : OPEN
L : GND

Switch

5.5 MHz 6.0 MHz 6.5 MHz 4.5 MHz

A B C
H H H

●●

H H L ●●
H L H ●●
H L L ●●
L H H ●● ●● ●●
L L L ●● ●● ●● ●●
L H L ●● ●●
L L H ●● ●●

Internal Equivalent Circuit Diagram

No. 5764-4/11

LA7566