Page 1
Ordering number :EN5636
83097HA(OT) No. 5636-1/16
Overview
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.
Functions
[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
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.
• Adjustment-free circuit design that does not require AFT
and SIF coils.
Package Dimensions
unit: mm
3067-DIP24S
unit: mm
3112-MFP24S
SANYO: DIP24S
[LA7565B]
SANYO: MFP24S
[LA7565BM]
LA7565B, 7565BM
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
IF Signal-Processing IC for PAL/NTSC Multi-System
Audio TV and VCR Products
Monolithic Linear IC
Page 2
No. 5636-2/16
LA7565B, 7565BM
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
CC
max 10 V
Circuit voltage V13, V17 V
CC
V
I6 –3 mA
Circuit current I10 –10 mA
I24 –2 mA
(LA7565B) Ta ≤ 68°C 720 mW
Allowable power dissipation Pd max (LA7565BM) Ta ≤ 50°C, independent IC 420 mW
(LA7565BM) * Mounted on a printed circuit board 720 mW
Operating temperature Topr –20 to +70 °C
Storage temperature Tstg –55 to +150 °C
Specifications
Maximum Rating at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Recommended supply voltage V
CC
9 V
Operating supply voltage V
CC
op 8.5 to 9.5 V
Operating Conditions
Note: * When mounted on a 65 × 72 × 1.6 mm epoxy glass laminate printed circuit board.
Parameter Symbol Conditions
Ratings
Unit
min typ max
[VIF Block]
Circuit current I
5
37.4 44 50.6 mA
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 26 32 38 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 S/N ratio S/N 48 50 dB
C-S beat IC-S 38 43 dB
Frequency characteristics f
C
6 MHz –3 –1.5 dB
Differential gain DG 3 6.5 %
Differential phase DP 3 5 deg
No-signal AFT voltage V
13
3.5 4.4 5.5 V
Maximum AFT voltage V
13H
8 8.7 9 V
Minimum AFT voltage V
13L
0 0.18 1 V
AFT detection sensitivity Sf 25 36 47 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 tolerance frequency 1 dfa 1 –500 0 +500 kHz
VCO1 maximum frequency range (U) dfu 1.0 1.3 MHz
VCO1 maximum frequency range (L) dfl –1.5 –1 MHz
VCO control sensitivity B 0.9 1.8 3.6 kHz/mV
Electrical Characteristics at Ta = 25°C, VCC= 9 V, fp = 38.9 MHz
Continued on next page.
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No. 5636-3/16
LA7565B, 7565BM
Parameter Symbol Conditions
Ratings
Unit
min typ max
[First SIF Block]
Conversion gain VG 37.5 43 49.5 dB
5.5 MHz output level S
O
46 100 150 mVrms
First SIF maximum input Si max 112 223 mVrms
First SIF input resistance Ri (SIF) 33.4 MHz 2 kΩ
First SIF input capacitance Ci (SIF) 33.4 MHz 3 pF
[SIF Block]
Limiting voltage Vi (lim) 43 48 53 dBµV
FM detector output voltage V
O
(FM) 5.5 MHz ± 30 kHz 720 900 1100 mVrms
AM rejection ratio AMR 50 60 dB
Total harmonic distortion THD 0.3 0.8 %
SIF S/N ratio S/N (FM) 57 62 dB
[SIF Converter]
Conversion gain VG (SIF) 7 11 14 dB
Maximum output level V max 102 108 111 dBµV
Carrier suppression ratio VGR (5.5) 14 26 dB
Oscillator level V
OSC
70 mVp-p
Oscillator leakage OSCleak 8 24 dB
Oscillator stopped current I
4
300 µA
Continued from preceding page.
Mounted on a 65 × 72 × 1.6 mm printed circuit board
Ambient temperature, Ta – °C Ambient temperature, Ta – °C
Allowable power dissipation, Pdmax – W
Allowable power dissipation, Pdmax – W
Independent IC
Page 4
Internal Equivalent Circuit and External Circuit Diagram
No. 5636-4/16
LA7565B, 7565BM
68 Ω
Page 5
AC Characteristics Test Circuit
Test Circuit
No. 5636-5/16
LA7565B, 7565BM
Impedance
analyzer
68 Ω
Page 6
Sample Application Circuit
PAL SPLIT
NT (US) SPLIT
No. 5636-6/16
LA7565B, 7565BM
68 Ω
Page 7
JAPAN SPLIT
NT (US) INTER
No. 5636-7/16
LA7565B, 7565BM
Page 8
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-µ F 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
Page 9
Pin No. Pin Pin function Equivalent circuit
No. 5636-9/16
LA7565B, 7565BM
Pin Functions
1 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.
2 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.
3
4
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.
Continued on next page.
3
68 Ω
Page 10
No. 5636-10/16
LA7565B, 7565BM
Pin No. Pin Pin function Equivalent circuit
5
6
7
8
V
CC
EQ amp
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 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
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.
Continued from preceding page.
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.
Page 11
No. 5636-11/16
LA7565B, 7565BM
Pin No. Pin Pin function Equivalent circuit
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
Continued from preceding page.
11
12
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.
Continued on next page.
To tuner
Page 12
No. 5636-12/16
LA7565B, 7565BM
Pin No. Pin Pin function Equivalent circuit
15 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.
Continued from preceding page.
16 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.
17 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.
Continued on next page.
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No. 5636-13/16
LA7565B, 7565BM
Pin No. Pin Pin function Equivalent circuit
18
19
VIF input
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
Continued from preceding page.
20 GND
21 RF AGC VR
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.
22 First SIF output
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.
Continued on next page.
Construct a chrominance
carrier trap here.
Page 14
No. 5636-14/16
LA7565B, 7565BM
Pin No. Pin Pin function Equivalent circuit
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.
Continued from preceding page.
2423FM 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
Page 15
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.
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
The high band is reduced
SAW filter
characteristics
The high band is
extended
Frequency Frequency
Page 16
No. 5636-16/16
LA7565B, 7565BM
This catalog provides information as of August, 1997. Specifications and information herein are subject to
change without notice.
■ 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.
Coil Specifications
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.
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.
SAW filter (SPLIT)
Picture
TSF1137U
Sound
Picture
TSF1241
Sound
Picture
TSF5315
Sound
SAW filter (INTER)
TSF5220
TSF5221
TSF5321
TSF5344
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