Sanyo LA7567N Tv and vcr vif/sif if signal-processing circuit with pal/ntsc multi-format audio support Datasheet

Ordering number : EN5765
Monolithic Linear IC
LA7567N, 7567NM
TV and VCR VIF/SIF IF Signal-Processing Circuit with
PAL/NTSC Multi-Format Audio Support
Overview
The LA7567N and LA7567NM are PAL/NTSC multiformat audio VIF/SIF IF ICs that adopt a semiadjustment-free system. The VIF block adopts a technique
that makes AFT adjustment unnecessary by adjusting the
VCO, thus simplifying the adjustment steps in the
manufacturing process. PLL detection is adopted in the
FM detector to support multi-format audio detection. A
built-in SIF converter is included to simplify multi-format
system designs. A 5-V power-supply voltage is used to
match that used in most multimedia systems. In addition,
these ICs also include a buzz canceller to suppress Nyquist
buzz and provide high audio quality.
Package Dimensions
unit: mm
3067-DIP24S
[LA7567N]
Functions
[VIF]
• VIF amplifier • PLL detector • BNC • RF AGC
• EQ amplifier • AFT • IF AGC • Buzz canceller
[First SIF]
• First SIF • First SIF detector • AGC
[SIF]
• Multi-format SIF converter • Limiter amplifier • PLL
FM detector
SANYO: DIP24S
unit: mm
3112-MFP24S
[LA7567NM]
Features
• Both AFT and SIF inductors built in, thus making
adjustment of external inductance unnecessary.
• A PAL/NTSC multi-format audio system can be
constructed easily.
• Built-in buzz canceller for excellent audio performance.
• VCC = 5 V, low power dissipation (250 mW)
Specifications
SANYO: MFP24S
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
VCC max
6
Circuit voltage
V13, V17
VCC
Circuit current
Allowable power dissipation
V
V
I6
–3
I10
–10
mA
I24
–2
mA
420
720
500
mW
mW
mW
Pd max
TA ≤ 50°C, Independent IC [LA7567NM]
*: Mounted on a printed circuit board
TA ≤ 70°C, Independent IC [LA7567N]
mA
Operating temperature
Topr
–20 to +70
°C
Storage temperature
Tstg
–55 to +150
°C
Note: When mounted on a 65 × 72 × 1.6 mm paper/phenolic resin printed circuit board.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
50698RM (OT) No. 5765-1/14
LA7567N, 7567NM
Operating Conditions at Ta = 25°C
Parameter
Symbol
Recommended supply voltage
VCC
Operating supply voltage range
VCC op
Conditions
Ratings
Unit
5
V
4.5 to 5.5
V
Operating Characteristics at Ta = 25°C, VCC = 5 V, fp = 38.9 MHz
Parameter
Symbol
Conditions
Ratings
min
typ
Unit
max
[VIF Block]
Circuit current
I5
Maximum RF AGC voltage
V14H
Minimum RF AGC voltage
V14L
Input sensitivity
AGC range
Maximum allowable input
No-signal state video output voltage
Synchronizing signal tip voltage
Video output level
VIN
S1 = OFF
40.8
48.0
VCC – 0.5
VCC
33
55.2
V
0
0.5
V
39
45
dBµV
GR
58
63
dB
VIN max
95
100
dBµV
V6
3.0
3.3
3.6
V6 tip
1.15
1.45
1.74
V
VO
1.36
1.60
1.84
Vp-p
V
Black noise threshold voltage
VBTH
0.5
0.8
1.1
Black noise clamp voltage
VBCL
1.6
1.9
2.2
Video signal-to-noise ratio
S/N
48
52
C-S beat
IC-S
Frequency characteristics
fC
6 MHz
V
V
dB
38
43
dB
–3.0
–1.5
dB
Differential gain
DG
3.0
6.5
Differential phase
DP
3
5
No-signal state AFT voltage
mA
%
deg
V13
2.0
2.5
3.0
V
Maximum AFT voltage
V13H
4.0
4.4
5.0
V
Minimum AFT voltage
V13L
0
0.18
1.00
AFT detection sensitivity
Sf
20
28
37
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)
0.7
fPL
kΩ
pF
1.5
MHz
–1.5
–0.9
AFT tolerance frequency 1
dfa1
–300
0
+300
VCO1 maximum variability range (U)
dfu
1.0
1.5
VCO1 maximum variability range (L)
dfl
VCO control sensitivity
B
1.4
V
mV/kHz
MHz
kHz
MHz
–1.5
–1.0
MHz
2.8
6.0
kHz/mV
[First SIF Block]
Conversion gain
VG
22
28
32
dB
5.5 MHz output level
SO
32
70
110
mVrms
50
100
First SIF maximum input
SIN max
First SIF input resistance
RIN (SIF)
33.4 MHz
2
kΩ
First SIF input capacitance
CIN (SIF)
33.4 MHz
3
pF
mVrms
[SIF Block]
Limiting sensitivity
Vli (lim)
FM detector output voltage
VO (FM)
AMR rejection ratio
AMR
Total harmonic distortion
THD
SIF S/N
S/N (FM)
5.5 MHz ±30 kHz *
42
48
54
dBµV
480
680
880
mVrms
50
60
0.3
57
dB
0.8
%
62
[SIF Converter]
Conversion gain
Maximum output level
Carrier suppression ratio
Oscillator level
Oscillator leakage
Oscillator stopped current
VG (SIF)
V max
8
11
14
dB
103
109
115
dBµV
VGR (5.5)
15
21
dB
VOSC
35
70
mVp-p
OSCleak
14
25
I4
dB
300
µA
Note: *Insert a resistor and capacitor in series between pin 23 and ground to adjust the level to acquire a wide dynamic range in the FM detector output.
No. 5765-2/14
LA7567N, 7567NM
Allowable power dissipation, Pd max — W
Pin Assignment
Ambient temperature, Ta — °C
Internal Equivalent Circuit and External Components
No. 5765-3/14
LA7567N, 7567NM
AC Characteristics Test Circuit
Test Circuit
Impedance
analyzer
No. 5765-4/14
LA7567N, 7567NM
Application Circuit Diagrams
PAL SPLIT
NT (US) SPLIT
No. 5765-5/14
LA7567N, 7567NM
JAPAN SPLIT
NT (US) INTER
No. 5765-6/14
LA7567N, 7567NM
Sample Application Circuit
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.
Connect pin 2 to ground through a 2-kΩ resistor.
• 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.
Insert a 0.01-µF capacitor between pin 21 and ground for oscillation prevention.
No. 5765-7/14
LA7567N, 7567NM
Pin Descriptions
Pin No.
Pin
Description
SIF INPUT
• SIF input. The input impedance is about 1 kΩ. Since
buzzing and buzz beating can occur if interference enters
this input pin, care must be taken when design the pattern
layout for this pin. Note that the video and chrominance
signals are especially likely to interfere with the audio
signal. Also, the VIF carrier signal can also cause
interference.
FM power supply filter
• FM detector bias line filter input. Used to improve the FM
detector signal-to-noise ratio.
C1 should be at least 0.47 µF, and 1 µF is recommended.
If the FM detector is not used, connect pin 2 to ground
through a 2-kΩ resistor. This stops the FM detector VCO.
3
4
SIF converter
• Pin 3 is the SIF converter output. The signal is passed
through a 6-MHz bandpass filter and input to the SIF
circuit. There is a 200-Ω resistor in series with the emitterfollower output.
• Pin 4 is the SIF converter 500-kHz oscillator connection.
Since this oscillator circuit includes an ALC, the oscillator
level is held fixed at a low level. If this circuit is not used,
connect pin 4 to ground through a 10-kΩ external resistor.
Providing this external resistor stops the 500-kHz oscillator
and allows the converter to be used as an amplifier.
5
VCC
1
2
Equivalent circuit
• Use the shortest distance possible when decoupling VCC
and ground.
Continued on next page.
No. 5765-8/14
LA7567N, 7567NM
Continued from preceding page.
Pin No.
Pin
Description
Equivalent circuit
• Equalizer circuit. This circuit is used to correct the video
signal frequency characteristics.
Pin 17 is the EQ amplifier input. This amplifier amplifies a
1.5-V p-p video signal to 2-V p-p.
• Notes on equalizer amplifier design
The equalizer amplifier is designed as a voltage follower
amplifier with a gain of about 2.3 dB. When used for
frequency characteristics correction, a capacitor, inductor,
and resistor must be connected in series between pin 7
and ground.
• Approach used in the equalizer amplifier
If vi is the input signal and vo is the output signal, then:
6
7
8
EQ amp
R1
—— +1 (vi + vin) = Vo × G
2
Where G is the voltage-follower amplifier gain.
Assume:
vin: Imaginary short
G: About 2.3 dB
vin ≈ 0.
Then:
voG
R1
AV = —— = —— +1
vi
Z
• R1 is the IC internal resistance, and is 1 kΩ. In the
application design, simply select Z to correspond to the
desired characteristics. However, since the EQ amplifier
gain will be maximum at the resonant point defined by Z,
care is required to assure that distortion does not occur.
9
APC FILTER
• PLL detector APC filter connection. The APC time constant
is switched internally in the IC. When locked, the VCO is
controlled by loop A and the loop gain is reduced. When
unlocked and during weak field reception, the VCO is
controlled by loop B and the loop gain is increased.
For this APC filter we recommend:
R = 150 to 390 Ω
C = 0.47 µF
Continued on next page.
No. 5765-9/14
LA7567N, 7567NM
Continued from preceding page.
Pin No.
Pin
Description
10
Composite video output
• Output for the video signal that includes the SIF carrier.
A resistor must be inserted between pin 10 and ground to
acquire adequate drive capability.
R ≥ 300 Ω
11
12
VCO tank
• VCO tank circuit used for video signal detection.
See the coil specifications provided separately for details
on the tank circuit. This VCO is a vector synthesis VCO.
13
14
15
AFT OUTPUT
RF AGC OUTPUT
1st SIF INPUT
Equivalent circuit
• AFT output. The AFT center voltage is generated by an
external bleeder resistor. The AFT gain is increased by
increasing the resistance of this external bleeder resistor.
However, this resistor must not exceed 390 kΩ.
This circuit includes a control function that controls the AFT
voltage to naturally approach the center voltage during
weak field reception.
• RF AGC output. This output controls the tuner RF AGC.
A protective 100-Ω resistor is inserted in series with the
open collector output. Determine the external bleeder
resistor value in accordance with the specifications of the
tuner.
• First SIF input. A DC cut capacitor must be used in the
input circuit.
• If a SAW filter is used:
The first SIF sensitivity can be increased by inserting an
inductor between the SAW filter and the IC to neutralize the
SAW filter output capacitance and the IC input
capacitance.
• When used in an intercarrier system:
This pin (pin 15) may be left open.
Continued on next page.
No. 5765-10/14
LA7567N, 7567NM
Continued from preceding page.
Pin No.
Pin
Description
1st SIF AGC FILTER
• First SIF AGC filter connection.
This IC adopts an average value AGC technique. The first
SIF conversion gain is about 30 dB, and the AGC range is
over 50 dB. A 0.01 µF capacitor is normally used in filter
connected to this pin.
• When used in an intercarrier system:
Connect this pin (pin 16) to ground. The IC internal switch
will operate to connect the intercarrier output to the SIF
converter input.
IF AGC FILTER
• IF AGC filter connection
The signal peak-detected by the built-in AGC detector is
converted to the AGC voltage at pin 17. Additionally, a
second AGC filter (a lag-lead filter) used to create the dual
time constants is provided internally in the IC.
Use a 0.022-µF capacitor as the external capacitor, and
adjust the value according to the sag, AGC speed, and
other characteristics.
18
19
VIF input
• VIF amplifier input.
The input circuit is a balanced circuit, and the input circuit
constants are:
R ≈ 1.5 kΩ
C ≈ 3 pF
20
GND
16
17
Equivalent circuit
Continued on next page.
No. 5765-11/14
LA7567N, 7567NM
Continued from preceding page.
Pin No.
21
Pin
RF AGC VR
Description
Equivalent circuit
• RF AGC VR connection.
This pin sets the tuner RF AGC operating point. Also, the
FM output and the video output can both be muted at the
same time by connecting this pin to ground.
• First SIF output.
Internally, this is an emitter-follower output with a 600-Ω
resistor attached. When used in an intercarrier system, the
buzz characteristics can be improved by forming a
chrominance carrier trap with this pin.
22
NICAM output
Forms a chrominance killer trap.
23
24
FM filter
FM Detector output
• Connection for a filter used to hold the FM detector output
DC voltage fixed. Normally, a 1-µF electrolytic capacitor
should be used. The capacitance should be increased if
the low band (around 50 Hz) frequency characteristics
need to be improved.
• Audio FM detector output. A 300-Ω resister is inserted in
series with an emitter-follower output.
• For applications that support stereo:
Applications that input this signal to a stereo decoder may
find that the input impedance is reduced, the left and right
signals are distorted, and that the stereo characteristics are
degraded. If this problem occurs, add a resistor between
pin 24 and ground.
R1 ≥ 5.1 kΩ
• For applications that support mono:
Create an external deemphasis circuit.
t = C × R2
No. 5765-12/14
LA7567N, 7567NM
Notes on Sanyo SAW Filters
There are two types of SAW filters, which differ in the piezoelectric substrate material, as follows:
• Lithium tantalate (LiTaO3) SAW filter
■ ■ ... Japan
TSF11■
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.
• 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
The high band is extended
Frequency
With the Tuning Set to the IF frequency
Coil Specifications
Frequency
With the Tuning Set to the Vicinity of S and C
JAPAN f = 58.75 MHz
US f = 45.75 MHz
PAL f = 38.9 MHz
Test production no. 16991B
Tokyo Parts Industrial Co., Ltd.
Test production no. 16687B
Tokyo Parts Industrial Co., Ltd.
Test production no. 16686B
Tokyo Parts Industrial Co., Ltd.
Picture
TSF1137U
Sound
Picture
TSF1241
Sound
Picture
TSF5315
Sound
TSF5220
TSF5221
TSF5321
TSF5344
VCO coil
SAW filter
(SPLIT)
SAW filter
(INTER)
Tokyo Parts Industrial Co., Ltd.
TEL: +81-270-23-3731
236 Hinode Machi, Isezaki Shi, Gunma Prefecture, Japan
No. 5765-13/14
LA7567N, 7567NM
Notes on VCO Tank Circuits
• 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
tank circuit. 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 tank circuit'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.
• 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 so 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 May, 1998. Specifications and information herein are subject to change
without notice.
PS No. 5765-14/14
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