Sanyo LA75691 Specifications
Overview
The LA75691 is a PAL/NTSC multichannel audio
VIF/SIF signal-processing IC that makes the minimum
number of adjustments possible. The system is designed
so that VCO adjustment makes AFT adjustment
unnecessary, thus simplifying the adjustment steps in endproduct manufacturing. PLL detection is adopted in the
FM detector, allowing the LA75691 to support
multichannel detection for the audio signal. In addition, it
also incorporates a buzz canceller that suppresses Nyquist
buzz for improved audio quality.
Functions
[VIF Block]
• PLL detector with minimum number of adjustments
• AFT
• Equalizer amplifier
• RF AGC
[First SIF BLOCK]
• First SIF detector
• HPF
[SIF Block]
• PLL-based FM detector
[Muting Block]
• AV muting
Features
• Excellent buzz and buzz/beating characteristics provided
by a PLL detection technique that includes a buzz
canceller.
• The second IF AGC filter is built in.
• No coils are used in the AFT and SIF circuits, making
them adjustment free.
Package Dimensions
unit: mm
3067-DIP24S
Monolithic Linear IC
90898RM (OT) No. 5734-1/13
SANYO: DIP24S
[LA75691]
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
IF Signal-Processing IC for PAL/NTSC Multichannel
Audio TV and VCR Systems
LA75691
Ordering number : EN5734
Ambient temperature, Ta — °C
Allowable power dissipation, Pd max — W
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.
No. 5734-2/13
LA75691
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
CC
max 13.2 V
Circuit voltage V13, V17 V
CC
V
I6 –3 mA
Circuit current I10 –10 mA
I24 –2 mA
Allowable power dissipation Pd max Ta ≤ 68°C 720 mW
Operating temperature Topr –20 to +70 °C
Storage temperature Tstg –55 to +150 °C
Note: When mounted on a 65 × 72 × 1.6 mm laminated paper phenolic resin printed circuit board.
Specifications
Maximum Ratings at Ta = 25°C
Parameter Symbol Conditions
Ratings
Unit
min typ max
[VIF Block]
Circuit current I
5
35.5 42.0 48.5 V
Maximum RF AGC voltage V
14H
7.5 8.1 V
Minimum RF AGC voltage V
14L
0 0.5 V
Input sensitivity V
IN
S1 = Off 24 30 36 dBµV
AGC range G
R
62 68 dB
Maximum allowable input V
IN
max 92 97 dBµV
No-signal video output voltage V
6
3.5 3.8 4.2 V
Synchronizing signal tip voltage V
6
tip 1.15 1.45 1.74 V
Video output level V
O
1.7 2.0 2.3 Vp-p
Black noise threshold voltage V
BTH
0.5 0.8 1.1 V
Black noise clamp voltage V
BCL
2.5 2.8 3.1 V
Video signal-to-noise ratio S/N 48 50 dB
C-S beating IC-S 38 43 dB
Frequency characteristics f
C
6 MHz –3.0 –1.5 dB
Differential gain DG 3.0 6.5 %
Differential phase DP 3 5 deg
Maximum AFT voltage V
13H
8.5 8.7 9.0 V
Minimum AFT voltage V
13L
0 0.18 0.5 V
AFT detection sensitivity Sf 22.4 28.0 33.6 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
0.8 1.3 MHz
APC pull-in range (L) f
PL
–1.5 –0.8 MHz
AFT frequency tolerances 1 dfa 1 –300 0 +300 kHz
VCO1 maximum variability range (U) dfu 1.0 1.3 MHz
VCO1 maximum variability range (L) dfl –1.5 –1.0 MHz
VCO control sensitivity B 1.4 2.8 5.6 kHz/mV
5.5 MHZ output level S
O
P/S = 14 dB 92 95 98 mVrms
[SIF Block]
Limiting voltage Vi (lim) 5.5 MHz ± 30 kHz 43 48 53 dBµV
FM detector output voltage V
O
(FM) 5.5 MHz ± 30 kHz 720 900 1100 mVrms
AM rejection ratio AMR AM = 30 % 50 60 dB
Total harmonic distortion THD 0.3 0.8 %
SIF signal-to-noise ratio S/N (FM) 57 62 dB
Operating Characteristics at Ta = 25°C, VCC= 9 V, fP= 38.9 MHz
Parameter Symbol Conditions Ratings Unit
Recommended supply voltage V
CC
9 V
Operating supply voltage range V
CC
op 8.5 to 12.5 V
Operating Conditions
Pin Assignment
No. 5734-3/13
LA75691
Internal Equivalent Circuit and External Circuits
No. 5734-4/13
LA75691
AC Characteristics Test Circuit
Test Circuit
Impedance
analyzer
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