LA7565BM [SANYO]
IF Signal-Processing IC for PAL/NTSC Multi-System Audio TV and VCR Products; 中频信号处理IC，适用于PAL / NTSC多系统音频的电视和录像机产品
| 型号： | LA7565BM |
| 厂家： | 
SANYO SEMICON DEVICE |
| 描述： | IF Signal-Processing IC for PAL/NTSC Multi-System Audio TV and VCR Products |
| 文件： | 总16页 (文件大小：322K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Ordering number :EN5636
Monolithic Linear IC
LA7565B, 7565BM
IF Signal-Processing IC for PAL/NTSC Multi-System
Audio TV and VCR Products
Overview
Package Dimensions
The LA7565B/M is a PAL/NTSC multi-system audio
VIF/SIF signal-processing IC that adopts a minimal-
adjustment technique. The VIF circuit adopts a minimal-
adjustment technique in which AFT adjustment is made
unnecessary by VCO adjustment to simply end product
adjustment. The FM detector circuit uses PLL detections
to support multi-system audio detection. Since the
LA7565BM include an SIF converter on chip, it is easy to
implement multi-system audio. In addition, it also includes
a buzz canceller that suppresses Nyquist buzz to achieve
improved audio quality.
unit: mm
3067-DIP24S
[LA7565B]
Functions
[VIF Block]
• Minimal adjustment PLL detector
• AFT
• RF AGC
SANYO: DIP24S
• Equalizer amplifier
• SIF converter
[First SIF Block]
• First SIF detector
• Inter/split switch
• HPF
unit: mm
3112-MFP24S
[LA7565BM]
[SIF Block]
• PLL type FM detector
[Mute Block]
• AV mute
Features
• Allows the use of a switch circuit to switch between
spilt and intercarrier operation.
• Improved buzz and buzz beat characteristics provided by
a PLL detector plus buzz canceller system.
• The IF AGC second filter is built in.
• PAL/NTSC multi-system audio can be implemented
easily.
SANYO: MFP24S
• Adjustment-free circuit design that does not require AFT
and SIF coils.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
83097HA(OT) No. 5636-1/16
LA7565B, 7565BM
Specifications
Maximum Rating at Ta = 25°C
Parameter
Maximum supply voltage
Circuit voltage
Symbol
Conditions
Ratings
10
Unit
V
V
CC max
V13, V17
I6
VCC
–3
V
mA
mA
mA
mW
mW
mW
°C
Circuit current
I10
–10
I24
–2
(LA7565B)
Ta ≤ 68°C
720
Allowable power dissipation
Pd max
(LA7565BM) Ta ≤ 50°C, independent IC
420
(LA7565BM) * Mounted on a printed circuit board
720
Operating temperature
Storage temperature
Topr
Tstg
–20 to +70
–55 to +150
°C
Note: * When mounted on a 65 × 72 × 1.6 mm epoxy glass laminate printed circuit board.
Operating Conditions
Parameter
Recommended supply voltage
Operating supply voltage
Symbol
VCC
Conditions
Ratings
9
Unit
V
V
CC op
8.5 to 9.5
V
Electrical Characteristics at Ta = 25°C, V = 9 V, fp = 38.9 MHz
CC
Ratings
typ
Parameter
Symbol
Conditions
Unit
min
max
[VIF Block]
Circuit current
I5
37.4
44
50.6
mA
V
Maximum RF AGC voltage
Minimum RF AGC voltage
Input sensitivity
V14H
V14L
VIN
7.5
8.1
0
0.5
38
V
S1 = OFF
26
62
32
dBµV
dB
dBµV
V
AGC range
GR
68
Maximum allowable input
No-signal video output voltage
Synchronizing signal tip voltage
Video output level
V
IN max
92
97
V6
3.5
1.15
1.7
0.5
2.5
48
3.8
1.45
2.0
0.8
2.8
50
4.2
1.74
2.3
V
6 tip
V
VO
VBTH
VBCL
S/N
IC-S
fC
Vp-p
V
Black noise threshold voltage
Black noise clamp voltage
Video S/N ratio
1.1
3.1
V
dB
dB
dB
%
C-S beat
38
43
Frequency characteristics
Differential gain
6 MHz
–3
–1.5
3
DG
DP
V13
V13H
V13L
Sf
6.5
5
Differential phase
3
deg
V
No-signal AFT voltage
Maximum AFT voltage
Minimum AFT voltage
AFT detection sensitivity
VIF input resistance
3.5
8
4.4
8.7
0.18
36
5.5
9
V
0
1
V
25
47 mV/kHz
Ri
38.9 MHz
38.9 MHz
1.5
3
kΩ
pF
VIF input capacitance
APC pull-in range (U)
APC pull-in range (L)
AFT tolerance frequency 1
VCO1 maximum frequency range (U)
VCO1 maximum frequency range (L)
VCO control sensitivity
Ci
fPU
fPL
0.8
1.3
–1.5
0
MHz
–0.8
MHz
kHz
dfa 1
dfu
dfl
–500
1.0
+500
1.3
–1.5
1.8
MHz
MHz
–1
B
0.9
3.6 kHz/mV
Continued on next page.
No. 5636-2/16
LA7565B, 7565BM
Continued from preceding page.
Ratings
typ
Parameter
Symbol
Conditions
Unit
min
max
[First SIF Block]
Conversion gain
VG
SO
37.5
43
100
223
2
49.5
dB
mVrms
mVrms
kΩ
5.5 MHz output level
First SIF maximum input
First SIF input resistance
First SIF input capacitance
[SIF Block]
46
150
Si max
112
Ri (SIF) 33.4 MHz
Ci (SIF) 33.4 MHz
3
pF
Limiting voltage
Vi (lim)
43
720
50
48
900
60
53
dBµV
mVrms
dB
FM detector output voltage
AM rejection ratio
VO (FM) 5.5 MHz ± 30 kHz
1100
AMR
THD
Total harmonic distortion
SIF S/N ratio
0.3
62
0.8
%
S/N (FM)
57
dB
[SIF Converter]
Conversion gain
VG (SIF)
V max
VGR (5.5)
VOSC
7
102
14
11
108
26
14
dB
dBµV
dB
Maximum output level
Carrier suppression ratio
Oscillator level
111
70
mVp-p
dB
Oscillator leakage
Oscillator stopped current
OSCleak
I4
8
24
300
µA
Mounted on a 65 × 72 × 1.6 mm printed circuit board
Independent IC
Ambient temperature, Ta – °C
Ambient temperature, Ta – °C
No. 5636-3/16
LA7565B, 7565BM
Internal Equivalent Circuit and External Circuit Diagram
No. 5636-4/16
LA7565B, 7565BM
AC Characteristics Test Circuit
Test Circuit
Impedance
analyzer
No. 5636-5/16
LA7565B, 7565BM
Sample Application Circuit
PAL SPLIT
NT (US) SPLIT
No. 5636-6/16
LA7565B, 7565BM
JAPAN SPLIT
NT (US) INTER
No. 5636-7/16
LA7565B, 7565BM
Sample Application Circuit (2)
When the SIF, first SIF, AFT, and RF AGC circuits are not used.
• When the SIF circuit is not used:
Leave pins 1, 23, and 24 open.
Insert a 2-kΩ resistor between pin 2 and ground.
• When the first SIF circuit is not used:
Leave pins 3, 4, 15, and 22 open.
Connect pin 16 to ground.
• When the AFT circuit is not used:
Since there is no way to defeat the AFT circuit, connect a 100-kΩ resistor and a 0.01-µF capacitor in parallel between
pin 13 and ground.
• When the RF AGC circuit is not used:
Leave pins 14 and 21 open.
A 0.01-µF capacitor must be inserted between pin 21 and ground to prevent oscillation.
Pin Assignment
No. 5636-8/16
LA7565B, 7565BM
Pin Functions
Pin No.
Pin
Pin function
Equivalent circuit
The input impedance is about 1 kΩ. If interference signals
enter via this pin, those signals may cause buzz and buzz
beat noise. (Here, signals such as video signals or
chrominance signals are the main audio interference
signals. The VIF carrier signal may also appear as
interference.) The application printed circuit board pattern
layout should be designed carefully to prevent interference
from entering at this pin.
1
SIF INPUT
The FM S/N ratio can be improved by inserting a filter in the
FM detector bias line.
The capacitor C1 should have a value of 0.47 µF or greater,
and 1 µF is recommended.
2
FM power supply filter
A 2-kΩ resistor must be inserted between pin 2 and ground
if the FM detector is not used. This stops the FM detector
VCO.
3
Pin 3 is the SIF converter output.
This signal is passed through a 6-MHz band-pass filter and
input to the SIF circuit. A 200-Ω resistor is inserted in series
with the emitter-follower output.
68 Ω
Pin 4 is the SIF converter 500-kHz oscillator pin.
Since the oscillator circuit includes an ALC circuit, the
oscillator level is controlled at a fixed, relatively low level. An
external 10-kΩ resistor must be inserted between pin 3 and
ground if this circuit is not used. Attaching this external
resistor stops the 500-kHz oscillator and the converter can
be used as an amplifier.
3
4
SIF converter
Continued on next page.
No. 5636-9/16
LA7565B, 7565BM
Continued from preceding page.
Pin No.
5
Pin
Pin function
Equivalent circuit
VCC and ground should be decoupled with as small a
separation as possible.
VCC
Connections for the equalizer circuit. This circuit corrects the
frequency characteristics of the video signal.
Pin 17 is the equalizer amplifier input. A 1.5-Vp-p video
signal is input and amplified to 2.0 Vp-p by the equalizer
amplifier.
The equalizer amplifier is designed as a voltage-follower
amplifier with a gain of about 2.3 dB. When frequency
characteristic correction is used, a capacitor, an inductor,
and a resistor must be connected in series between pin 7
and ground.
• Using the equalizer amplifier
If vi is the input signal and vo is the output signal, then:
R1/Z + 1 (vi + vin) = Vo × G
Where,
G: Gain of the voltage follower amplifier
vin: Imaginary short
6
7
8
EQ amp
G: About 2.3 dB
Assuming vin ≈ 0:
Then,
AV = voG/vi = R1/Z + 1.
R1 is an IC internal resistor with a value of 1 kΩ. Simply
select a Z according to the desired characteristics. However,
since the equalizer amplifier is maximum at the Z resonance
point, care is required to prevent distortion from occurring at
that frequency.
PLL detector APC filter connection.
The APC time constant is switched internally. When the PLL
is locked, the VCO is controlled over the path marked A in
the figure and the loop gain is lowered. When the PLL is
unlocked and in weak field reception conditions, the VCO is
controlled over the path marked B in the figure and the loop
gain is increased.
9
APC filter
We recommend values of:
R = between 150 and 390 Ω, and
C = 0.47 µF
for this APC filter.
Continued on next page.
No. 5636-10/16
LA7565B, 7565BM
Continued from preceding page.
Pin No.
Pin
Pin function
Equivalent circuit
Output for the video signal that includes the SIF carrier.
To acquire adequate drive capabilities, a resistor must be
inserted between pin 10 and ground.
10
Composite video output
R ≥ 300 Ω
This is the VCO tank circuit used for the video detector.
Refer to the coil specifications provided separately for more
information on the tank circuit. This VCO is a vector
synthesis VCO.
11
12
VCO tank
The AFT center voltage is created by an external bleeder
resistor. The AFT gain increases as the value of this
external bleeder resistor is increased. Note that the value of
this resistor must not exceed 390 kΩ.
13
AFT output
This circuit includes a control function that naturally brings
the AFT voltage to its center value under weak field
reception conditions.
This output controls the tuner RF AGC.
There is a 200-Ω series protection resistor inserted in the
emitter output. Determine the value of the external bleeder
resistor based on the characteristics of the tuner used.
To tuner
14
RF AGC output
Continued on next page.
No. 5636-11/16
LA7565B, 7565BM
Continued from preceding page.
Pin No.
Pin
Pin function
Equivalent circuit
A DC cut capacitor must be used in the input to this circuit.
• When using a SAW filter:
The first SIF sensitivity can be increased by inserting an
inductor between the SAW filter and the IC input to
counteract the SAW filter output capacitance and the IC
input capacitance.
15
First SIF input
• When used with an intercarrier sound system:
This pin may be left open.
This IC adopts an average-value AGC technique. The first
SIF conversion gain is about 30 dB, and the AGC range is
50 dB or greater. A capacitor of 0.01 µF is normally used as
the filter connected to this pin.
16
First SIF AGC filter
• When used with an intercarrier sound system:
This pin (pin 16) should be shorted to ground. The IC
internal switch will operate and the intercarrier output will be
connected to the SIF converter input.
The internal AGC peak detector output signal is converted
to the AGC voltage at pin 17. Additionally, a second AGC
filter (a lag-lead filter) used to create dual time constants
internally to the IC is built in.
17
IF AGC filter
A 0.022-µF external capacitor is used. The value of this
capacitor must be adjusted based on an analysis of the sag,
AGC speed, and other aspects.
Continued on next page.
No. 5636-12/16
LA7565B, 7565BM
Continued from preceding page.
Pin No.
Pin
Pin function
Equivalent circuit
Input for the VIF amplifier.
The input circuit creates an averaged input and has an input
18
19
impedance determined by the following resistor and
capacitor values.
R ≈ 1.5 kΩ
VIF input
C ≈ 3 pF
20
GND
RF AGC VR connection.
This pin sets the tuner RF AGC operating point. Also, the
FM output and the video output can be muted at the same
time by shorting this pin to ground.
21
RF AGC VR
A 600-Ω resistor is attached to the emitter follower internally
for signal output. When an intercarrier sound system is
used, the buzz characteristics can be improved by forming a
chrominance carrier trap on this pin.
22
First SIF output
Construct a chrominance
carrier trap here.
Continued on next page.
No. 5636-13/16
LA7565B, 7565BM
Continued from preceding page.
Pin No.
Pin
Pin function
Equivalent circuit
Connection for a filter used to hold the FM detector output at
a fixed DC voltage.
23
FM filter
Normally, a 1-µF electrolytic capacitor is used. If the low
area (around 50 Hz) frequency characteristics are seen as a
problem, this capacitance should be increased.
Audio FM detector output.
A 200-Ω resistor is inserted in series after the emitter
follower.
• In applications that support stereo:
In applications that input to a stereo decoder, the reduced
input impedance can cause distortion in the L-R signal. This
may degrade the stereo characteristics. If this is a problem
add the resistor R1 between pin 24 and ground.
R1 ≥ 5.1 kΩ
24
FM detector output
• In applications that support mono:
Attach an external de-emphasis circuit with the following
time constant.
t = CR2
No. 5636-14/16
LA7565B, 7565BM
Notes on Sanyo SAW Filters
There are two types of SAW filters, which differ in the piezoelectric substrate material, as follows:
1. Lithium tantalate (LiTaO3) SAW filter
TSF11 ■ ■ ······ Japan
TSF12 ■ ■ ······ US
Although lithium tantalate SAW filters have the low temperature coefficient of –18 ppm/°C, they suffer from a large
insertion loss. However, it is possible, at the cost of increasing the number of external components required, to minimize
this insertion loss by using a matching circuit consisting of coils and other components at the SAW filter output. At the
same time as minimizing insertion loss, this technique also allows the frequency characteristics, level, and other aspects
to be varied, and thus provides increased circuit design flexibility. Also, since the SAW filter reflected wave level is
minimal, the circuit can be designed with a small in-band ripple level.
2. Lithium niobate (LiNbO3) SAW filter
TSF52 ■ ■ ······ US
TSF53 ■ ■ ······ PAL
Although lithium niobate SAW filters have the high temperature coefficient of –72 ppm/°C, they feature an insertion loss
about 10 dB lower than that of lithium tantalate SAW filters. Accordingly, there is no need for a matching circuit at the
SAW filter output. Although the in-band ripple is somewhat larger than with lithium tantalate SAW filters, since they
have a low impedance and a small field slew, they are relatively immune to influences from peripheral circuit
components and the geometry of the printed circuit board pattern. This allows stable out-of-band trap characteristics to be
acquired. Due to the above considerations, lithium tantalate SAW filters are used in applications for the US and Japan
that have a high IF frequency, and lithium niobate SAW filters are used in PAL and US applications that have a low IF
frequency.
Notes on SAW Filter Matching
In SAW filter input circuit matching, rather than matching the IF frequency, flatter video band characteristics can be
acquired by designing the tuning point to be in the vicinity of the audio carrier rather than near the chrominance carrier.
The situation shown in figure on the right makes it easier to acquire flat band characteristics than that in figure on the left.
SAW filter
characteristics
The high band is
extended
The high band is reduced
Frequency
Frequency
With the tuning set to the IF frequency
With the tuning set to the vicinity of S and C
No. 5636-15/16
LA7565B, 7565BM
Coil Specifications
JAPAN
US
PAL
f = 58.75 MHz
f = 45.75 MHz
f = 38.9 MHz
VCO coil
Test production no. 16991B
Tokyo Parts Industry Co., Ltd.
Test production no. 16991B
Tokyo Parts Industry Co., Ltd.
Test production no. 16991B
Tokyo Parts Industry Co., Ltd.
Picture
Picture
Picture
TSF1137U
TSF1241
TSF5315
SAW filter (SPLIT)
Sound
Sound
Sound
TSF5220
TSF5221
TSF5321
TSF5344
SAW filter (INTER)
Tokyo Parts Industry Co., Ltd.
236 Hinode-cho, Isesaki city, Gunma Prefecture, Japan TEL: +81-270-23-3731
Notes on VCO Tank Circuits
1. Built-in capacitor VCO tank circuits
When the power is turned on, the heat generated by the IC is transmitted through the printed circuit board to the VCO
transformer. At this point, the VCO coil frame functions as a heat sink and the IC heat is dissipated. As a result, it
becomes more difficult to transmit heat to the VCO transformer's built-in capacitor, and the influence of drift at
power on is reduced. Therefore, it suffices to design the circuit so that the coil and capacitor thermal characteristics
cancel. Ideally, it is better to use a coil with a core material that has low temperature coefficient characteristics.
2. External capacitor VCO tank circuits
When an external capacitor is used, heat generated by the IC is transmitted through the printed circuit board directly
to the VCO tank circuit external capacitor. While this capacitor is heated relatively early after the power is turned on,
the coil is not influenced as much by this heat, and as a result the power-on drift is increased. Accordingly, a coil
whose core material has low temperature coefficient characteristics must be used. It is also desirable to use a
capacitor with similarly low temperature coefficient characteristics.
Note: Applications that use an external capacitor here must use a chip capacitor. If an ordinary capacitor is used,
problems such as the oscillator frequency changing with the capacitor orientation may occur.
■ No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace
equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of
which may directly or indirectly cause injury, death or property loss.
■ Anyone purchasing any products described or contained herein for an above-mentioned use shall:
➀ Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and
distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all
damages, cost and expenses associated with such use:
➁ Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on
SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees
jointly or severally.
■ Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for
volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied
regarding its use or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of August, 1997. Specifications and information herein are subject to
change without notice.
No. 5636-16/16
相关型号：
LA75675M-S
VIF/SIF IF Signal-Processing Circuit that Supports NTSC Intercarrier for TV and VCR Products
SANYO
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