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Número de pieza | LA75676V-S | |
Descripción | VIF/SIF IF Signal-Processing Circuit for TV and VCR Products | |
Fabricantes | Sanyo | |
Logotipo | ||
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Monolithic Linear IC
LA75676V-S
VIF/SIF IF Signal-Processing Circuit
for TV and VCR Products
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.
• VCC = 5 V and a low power dissipation of 250 mW.
Package Dimensions
unit: mm
3175B-SSOP24
[LA75676V-S]
7.8
24
Pd max — Ta
600
500
When mounted on a 114.3 × 76.1 × 1.6 mm3 glass epoxy printed circuit board
400
300
200
100
0
–20 0
20
40
60 70 80
100
Ambient temperature, Ta — °C
1
(0.33) 0.65 0.22
0.15
SANYO: SSOP24 (275 mil)
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
22802TN (OT) No. 6277-1/13
1 page LA75676V-S
AC Characteristics Test Circuit
FM DET OUT
(D)
7.5kΩ
4.5MHzOUT
(E)
RF AGC
VR
VIF IN
51Ω
GND
+
IF AGC
9V
24 23 22 21 20 19 18 17 16 15 14 13
V
6.8kΩ
FM
DET
RF
AGC
IF
AGC
VIF
AMP
VIDEO
DET
9dB
AFT
LIM
AMP
HPF
1 2 34 56
51Ω
+
+
2nd SIF IN
CONV.OUT
(E)
VIDEO
OUT
(A)
EQ
AMP
7
89
+
330Ω
VCO
10 11 12
24pF
Test Circuit
Impedance
analyzer
VIF IN
RF AGC
OUT
(F)
AFT
OUT
(B)
VCC
GND
A13266
24 23 22 21 20 19 18 17 16 15 14 13
LA75676V-S
1 2 3 4 5 6 7 8 9 10 11 12
+
VCC
A13267
No. 6277-5/13
5 Page Continued from preceding page.
Pin No.
Pin
LA75676V-S
Function
Bandpass filter output
22
BPF-out
The output to the external bandpass filter is passed
through an internal 6 dB amplifier before being output.
Equivalent circuit
200Ω
22
A13282
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.
1kΩ 1kΩ
23
R
C
+
A13283
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
stereo characteristics. If this problem occurs, add a
R2
24
300Ω
resistor between pin 24 and ground.
R1 ≥ 5.1 kΩ
C R1
10kΩ
• Mono applications
Construct an external deemphasis circuit.
t = CR2
A13284
No. 6277-11/13
11 Page |
Páginas | Total 13 Páginas | |
PDF Descargar | [ Datasheet LA75676V-S.PDF ] |
Número de pieza | Descripción | Fabricantes |
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