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PDF LA75675M-S Data sheet ( Hoja de datos )
| Número de pieza | LA75675M-S | |
| Descripción | VIF/SIF IF Signal-Processing Circuit that Supports NTSC Intercarrier for TV and VCR Products | |
| Fabricantes | Sanyo | |
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Ordering number : ENN6276B
Monolithic Linear IC
LA75675M-S
VIF/SIF IF Signal-Processing Circuit that Supports
NTSC Intercarrier for TV and VCR Products
Overview
The LA75675M-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 • BNC • 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.
• VCC = 5 V and a low power dissipation of 250 mW.
Package Dimensions
unit: mm
3112A-MFP24S
[LA75675M-S]
24 13
Pd max - Ta
800
When mounted on a 65 × 72 × 1.6 mm3 paper-phenol printed circuit board
720
700
600
500
Independent IC
420
400
300
200
100
0
-20
0
20 40
60 70 80
Ambient temperature, Ta — °C
100
1
12
12.5 0.15
0.35 1.0 (0.75)
SANYO: MFP24S
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.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
51500RM (OT) No. 6276-1/13
1 page  
LA75675M-S
AC Characteristics Test Circuit
FM DET OUT
(D)
7.5 kΩ
4.5 MHz
(E)
RF AGC
VR
VIF IN
51 Ω
GND
+
IF AGC
24 23 22 21 20 19 18 17 16 15
6.8 kΩ
RF IF
VIF
AMP
FM AGC AGC
DET
VIDEO
DET
6 dB
HPF
LIM
AMP
EQ
AMP
1 2 34 56 7 89
+
51 Ω
+
+
2nd SIF IN SIF.OUT
VIDEO
OUT
(A)
330 Ω
10
14 13 V
AFT
VCO
11 12
24 pF
Test Circuit
Impedance
analyzer
VIF IN
RF AGC
OUT
(F)
AFT
OUT
(B)
VCC
GND
A12617
24 23 22 21 20 19 18 17 16 15 14 13
LA75675M-S
1 2 3 4 5 6 7 8 9 10 11 12
+
VCC
A12618
No. 6276-5/13
5 Page 
Continued from preceding page.
Pin No.
Pin
LA75675M-S
Function
Equivalent circuit
4.2 V
RF AGC adjustment
21
RF AGC VR
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.
20 kΩ
20 kΩ
560 Ω
21
A12632
Bandpass filter output
22
BPF-out
The output to the external bandpass filter is passed
through an internal 6 dB amplifier before being output.
200 Ω 22
A12633
Filter that holds the FM detector output DC voltage
fixed.
Normally, a 1 µF electrolytic capacitor is used. If the
23
FM filter
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.
1 kΩ 1 kΩ
23
R
C
+
A12634
Audio FM detector output
This is an emitter-follower circuit with a 300 Ω resistor
inserted in series.
• Stereo applications
In some application that provide input to a stereo
decoder, the input impedance may be reduced,
24
FM detector output
resulting in distortion in the L-R signal and degraded
R2
24
stereo characteristics. If this problem occurs, add a
300 Ω
resistor between pin 24 and ground.
R1 ≥ 5.1 kΩ
C R1
10 kΩ
• Mono applications
Construct an external deemphasis circuit.
t = CR2
A12635
No. 6276-11/13
11 Page | ||
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