ETC LA7565E

Ordering number :EN5636A
Monolithic Linear IC
LA7565B, 7565BM
IF Signal-Processing IC for PAL/NTSC Multi-System
Audio TV and VCR Products
Package Dimensions
unit: mm
3067-DIP24S
[LA7565B]
24
0.25
7.62
6.4
Functions
1
12
0.81
1.78
0.48
3.25
3.9max
21.2
3.3
SANYO: DIP24S
0.95
unit: mm
3112-MFP24S
24
[LA7565BM] 13
6.35
7.6
[VIF Block]
• Minimal adjustment PLL detector
• AFT
• RF AGC
• Equalizer amplifier
• SIF converter
[First SIF Block]
• First SIF detector
• Inter/split switch
• HPF
[SIF Block]
• PLL type FM detector
[Mute Block]
• AV mute
13
0.51min
The LA7565B/M is a PAL/NTSC multi-system audio
VIF/SIF signal-processing IC that adopts a minimaladjustment technique. The VIF circuit adopts a minimaladjustment 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.
• PAL/NTSC multi-system audio can be implemented
easily.
• Adjustment-free circuit design that does not require AFT
and SIF coils.
5.4
Overview
12
1.8max
1
0.15
1.5
12.6
0.1
• 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.
0.625
Features
0.35
1.0 0.8
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 Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
23099HA(OT) / 83097HA(OT) No. 5636-1/17
LA7565B, 7565BM
Specifications
Maximum Rating at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
VCC max
10
V
Circuit voltage
V13, V17
VCC
V
I6
–3
Circuit current
I10
–10
mA
I24
–2
mA
(LA7565B)
Allowable power dissipation
Pd max
Ta ≤ 68°C
(LA7565BM) Ta ≤ 50°C, independent IC
(LA7565BM) * Mounted on a printed circuit board
mA
720
mW
420
mW
720
mW
Operating temperature
Topr
–20 to +70
°C
Storage temperature
Tstg
–55 to +150
°C
Ratings
Unit
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
Conditions
VCC
VCC op
9
V
8.5 to 9.5
V
Operating Characteristics at Ta = 25°C, VCC = 9 V, fp = 38.9 MHz
Parameter
Symbol
Conditions
Ratings
min
typ
Unit
max
[VIF Block]
I5
37.4
44
Maximum RF AGC voltage
Circuit current
V14H
7.5
8.1
Minimum RF AGC voltage
V14L
Input sensitivity
VIN
AGC range
Maximum allowable input
S1 = OFF
26
50.6
mA
V
0
0.5
V
32
38
dBµV
GR
62
68
dB
VIN max
92
97
dBµV
No-signal video output voltage
V6
3.5
3.8
4.2
V
Synchronizing signal tip voltage
V6 tip
1.15
1.45
1.74
V
Video output level
VO
1.7
2.0
2.3
Vp-p
Black noise threshold voltage
VBTH
0.5
0.8
1.1
V
Black noise clamp voltage
VBCL
2.5
2.8
3.1
Video S/N ratio
S/N
48
50
C-S beat
IC-S
Frequency characteristics
fC
6 MHz
V
dB
38
43
dB
–3
–1.5
dB
Differential gain
DG
3
6.5
Differential phase
DP
3
5
%
deg
No-signal AFT voltage
V13
3.5
4.4
5.5
V
Maximum AFT voltage
V13H
8
8.7
9
V
Minimum AFT voltage
V13L
0
0.18
1
V
AFT detection sensitivity
Sf
25
36
47
mV/kHz
VIF input resistance
Ri
38.9 MHz
1.5
VIF input capacitance
Ci
38.9 MHz
3
APC pull-in range (U)
fPU
APC pull-in range (L)
AFT tolerance frequency 1
0.8
fPL
dfa 1
VCO1 maximum frequency range (U)
dfu
VCO1 maximum frequency range (L)
dfl
VCO control sensitivity
B
kΩ
pF
1.3
MHz
–1.5
–0.8
–500
0
+500
1.0
1.3
0.9
MHz
kHz
MHz
–1.5
–1
MHz
1.8
3.6
kHz/mV
Continued on next page.
No. 5636-2/17
LA7565B, 7565BM
Continued from preceding page.
Parameter
Symbol
Ratings
Conditions
min
typ
max
Unit
[First SIF Block]
Conversion gain
VG
37.5
43
49.5
dB
5.5 MHz output level
SO
46
100
150
mVrms
112
223
First SIF maximum input
Si max
First SIF input resistance
Ri (SIF)
33.4 MHz
2
mVrms
kΩ
First SIF input capacitance
Ci (SIF)
33.4 MHz
3
pF
[SIF Block]
Limiting voltage
Vi (lim)
FM detector output voltage
VO (FM)
AM rejection ratio
AMR
Total harmonic distortion
THD
SIF S/N ratio
5.5 MHz ± 30 kHz
43
48
53
720
900
1100
50
60
0.3
S/N (FM)
57
dBµV
mVrms
dB
0.8
62
%
dB
[SIF Converter]
Conversion gain
Maximum output level
Carrier suppression ratio
Oscillator level
Oscillator leakage
7
11
14
dB
V max
102
108
111
dBµV
VGR (5.5)
14
VOSC
OSCleak
8
26
dB
70
mVp-p
24
I4
Ambient temperature, Ta – °C
dB
300
Allowable power dissipation, Pdmax – W
Allowable power dissipation, Pdmax – W
Oscillator stopped current
VG (SIF)
µA
Mounted on a 65 × 72 × 1.6 mm printed circuit board
Independent IC
Ambient temperature, Ta – °C
Pin Assignment
No. 5636-3/17
LA7565B, 7565BM
68 Ω
Internal Equivalent Circuit and External Circuit Diagram
No. 5636-4/17
LA7565B, 7565BM
68 Ω
AC Characteristics Test Circuit
Test Circuit
Impedance
analyzer
No. 5636-5/17
LA7565B, 7565BM
68 Ω
Sample Application Circuit
PAL SPLIT
NT (US) SPLIT
No. 5636-6/17
LA7565B, 7565BM
JAPAN SPLIT
NT (US) INTER
Note: * For R, use a resistor with a value in the range 10 to 15 kΩ. Select a value in that range that minimizes degradation of the distortion characteristics.
No. 5636-7/17
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.
No. 5636-8/17
LA7565B, 7565BM
Pin Functions
Pin No.
1
2
3
4
Pin
Pin function
SIF INPUT
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.
FM power supply filter
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.
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.
SIF converter
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.
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.
Equivalent circuit
3
Continued on next page.
No. 5636-9/17
LA7565B, 7565BM
Continued from preceding page.
Pin No.
5
Pin
VCC
Pin function
Equivalent circuit
V CC and ground should be decoupled with as small a
separation as possible.
Connections for the equalizer circuit. This circuit corrects the
frequency characteristics of the video signal.
Pin 8 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.
6
7
8
EQ amp
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
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.
9
APC filter
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.
We recommend values of:
R = between 150 and 390 Ω, and
C = 0.47 µF
for this APC filter.
Continued on next page.
No. 5636-10/17
LA7565B, 7565BM
Continued from preceding page.
Pin No.
Pin
Pin function
10
Composite video output
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.
R ≥ 300 Ω
VCO tank
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.
13
AFT output
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.
This circuit includes a control function that naturally brings
the AFT voltage to its center value under weak field
reception conditions.
14
RF AGC output
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.
11
12
Equivalent circuit
To tuner
Continued on next page.
No. 5636-11/17
LA7565B, 7565BM
Continued from preceding page.
Pin No.
15
16
17
Pin
Pin function
First SIF input
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.
• When used with an intercarrier sound system:
This pin may be left open.
First SIF AGC filter
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.
• 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.
IF AGC filter
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.
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.
Equivalent circuit
Continued on next page.
No. 5636-12/17
LA7565B, 7565BM
Continued from preceding page.
Pin No.
Pin
18
19
VIF input
20
GND
21
RF AGC VR
Pin function
Equivalent circuit
Input for the VIF amplifier.
The input circuit creates an averaged input and has an input
impedance determined by the following resistor and
capacitor values.
R ≈ 1.5 kΩ
C ≈ 3 pF
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.
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. 5636-13/17
LA7565B, 7565BM
Continued from preceding page.
Pin No.
23
24
Pin
Pin function
FM filter
Connection for a filter used to hold the FM detector output at
a fixed DC voltage.
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.
FM detector output
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
• In applications that support mono:
Attach an external de-emphasis circuit with the following
time constant.
t = CR2
Equivalent circuit
No. 5636-14/17
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 reduced
Frequency
With the tuning set to the IF frequency
The high band is
extended
Frequency
With the tuning set to the vicinity of S and C
No. 5636-15/17
LA7565B, 7565BM
Coil Specifications
JAPAN
f = 58.75 MHz
US
f = 45.75 MHz
PAL
f = 38.9 MHz
Test production no. V291XCS-3220Z
Toko Co., Ltd.
Test production no. 291XCS-3188Z
Toko Co., Ltd.
Test production no. 292GCS-7538Z
Toko Co., Ltd.
Picture
TSF1137U
Picture
TSF1241
Picture
TSF5315
Sound
Sound
Sound
TSF5220
TSF5221
TSF5321
TSF5344
VCO coil
SAW filter (SPLIT)
SAW filter (INTER)
Toko Co., Ltd.
2-1-17 Higashi-yukigaya, Ohota-ku, Tokyo, Japan TEL: +81-3-3727-1167
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. 5636-16/17
LA7565B, 7565BM
Specifications of any and all SANYO products described or contained herein stipulate the performance,
characteristics, and functions of the described products in the independent state, and are not guarantees
of the performance, characteristics, and functions of the described products as mounted in the customer’s
products or equipment. To verify symptoms and states that cannot be evaluated in an independent device,
the customer should always evaluate and test devices mounted in the customer’s products or equipment.
SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all
semiconductor products fail with some probability. It is possible that these probabilistic failures could
give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,
or that could cause damage to other property. When designing equipment, adopt safety measures so
that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective
circuits and error prevention circuits for safe design, redundant design, and structural design.
In the event that any or all SANYO products (including technical data, services) described or contained
herein are controlled under any of applicable local export control laws and regulations, such products must
not be exported without obtaining the export license from the authorities concerned in accordance with the
above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system,
or otherwise, without the prior written permission of SANYO Electric Co., Ltd.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the “Delivery Specification”
for the SANYO product that you intend to use.
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 February, 1999. Specifications and information herein are subject
to change without notice.
PS No. 5636-17/17