Sanyo LA7583 If signal processing circuit (a2c pll vif sif) for tvs and vcr Datasheet

Ordering number: EN5177
Monolithic Linear IC
LA7583
IF Signal Processing Circuit
(A C PLL VIF + SIF) for TVs and VCRs
2
Package Dimensions
Overview
The LA7583 is a VIF + SIF IC that requires no adjustments. In
order to eliminate the need for adjustments in the VIF block, a
multi-network PLL has been developed and adopted for video
detection. In the SIF block, adjustments were eliminated by
using gyrator technology in the FM quadrature detector. In
addition to eliminating the need for adjustments, a buzz
canceller that suppresses Nyquist buzz has been built into the
LA7583 in order to provide excellent sound quality.
unit : mm
3067-DIP24S
[LA7583]
Features
. Elimination of VCO, AFT, and SIF coils eliminates the need
adjustments.
. for
A variety of built-in filters.
. Built-in buzz canceller results in excellent audio
SANYO : DIP24S
characteristics.
Note: A2C Automatic Adjustment Control
AQT Automatic Quadrature Tuning
Functions
[VIF]
VIF amplifier
Equalizer amplifier
AGC lag lead filter
[1st SIF]
Preamplifier
[SIF]
Limiter amplifier
[mute]
Audio mute
.
.
.
.
.
.
. Multinetwork PLL
. AFT
. Video driver
. 1st SIF detector
. AQT detector (gyrator)
. AV mute
. BNC
. IFAGC
. FAGC
. Buzz canceller
. AGC detector
. J/U switch
. Built-in AGC filter
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
83095HA(II) No.5177-1/15
LA7583
Specifications
Maximum Ratings at Ta = 25 °C
Parameter
Symbol
Conditions
Ratings
VCC 1
Maximum supply voltage
VCC 2
Circuit voltage
Circuit current
Allowable power dissipation
Unit
7
V
13.2
V
V4
VCC 1
V
V3, V11
VCC 2
V
I1, I10, I23
–1
mA
I3, I21
–3
mA
I15, I19
–5
mA
Pd max
Ta % 50 °C
1000
mW
Operating temperature
Topr
–20 to +70
°C
Storage temperature
Tstg
–55 to +150
°C
* A2C (Automatic Adjustment Control)
Note: Current flowing into the IC is positive (no signal) and current flowing out is negative.
Top View
Allowable power dissipation, Pd max − mW
Pin Assignment
Pd max — Ta
Ambient temperature, Ta − °C
No.5177-2/15
LA7583
Operating Conditions at Ta = 25 °C
Parameter
Symbol
Recommended supply voltage
Operating supply voltage range
Conditions
Ratings
Unit
VCC1
5
V
VCC2
9
V
VCC1
4.6 to 6
V
VCC2
7 to 12
V
Electrical Characteristics at Ta = 25 °C, VCC1 = 5 V, VCC2 = 9 V, fp = 45.75 MHz
Parameter
[VIF Block]
Circuit current 1
Circuit current 2
Maxinum RF AGC voltage
Mininum RF AGC voltage
Input sensitivity
AGC range
Maxinum Allowable Input
Video output voltage
with no signal
Sync signal tip voltage
Video output amplitude
Black noise threshold level
voltage
Black noise clamp voltage
Output S/N
920 kHz beat level
Frequency characteristics
Differential gain
Differential phase
AFT output voltage
with no signal
Maxinum AFT output voltage
Mininum AFT output voltage
AFT detection sensitivity
VIF input resistance
VIF input capacity
APC pull-in range (U)
APC pull-in range (L)
AFT crossover frequency
VCO1 maximum variable range
VCO2 maximum variable range
VCO1 control sensitivity
VCO2 control sensitivity
[1st SIF Block]
4.5 MHz output gain
4.5 MHz output level
1st SIF maximum input level
1st SIF input resistance
1st SIF input capacity
Symbol
min
typ
max
Unit
VCC = 5 V
VCC = 9 V
V4 = 3 V
V4 = 1.5 V
S1 = OFF
57
7.8
7.5
32
56
95
66
11.0
8.1
0
38
62
103
78
14.0
9
+0.5
44
mA
mA
V
V
dBµ
dB
dBµ
V4 = 2 V
3.3
3.6
3.9
V
Vi = 10 mV
87.5% mod
1.1
1.7
1.4
2.0
1.7
2.3
V
Vp-p
VBTH
0.4
0.7
1.1
V
VBCL
S/N
I920
fC
DG
DP
1.65
48
41
6
1.95
52
45
8
3
3
2.25
V
dB
dB
MHz
%
rad
8.7
I20
I8
V3H
V3L
Vi
GR
Vi max
V19
V19(tip)
VO(V)
Conditions
P = 0, C = –10 dB, S = –10 dB
P = 0, S = –14 dB
Vi = 10 mV, 87.5%
10STAR STEP
V11
0.3
4.5
V11H
V11L
Sf
Ri(VIF)
Ci(VIF)
fPU
fPL
∆fA
∆fU1
∆fL1
∆fU2
∆fL2
β1
β2
7.5
0
33
0.8
2
1.0
8.5
+1
48
1.1
3
3
–4.5
VG
SO
Si (max)
Ri (SIF1)
Ci (SIF1)
f = 45.75 MHz
f = 45.75 MHz
V22
V22
V16
V16
V22
V16
=
=
=
=
=
=
4V
2V
4V
2V
2.8 V to 3.2 V
2.8 V to 3.2 V
Vi = 1 mV, 41.25 MHz
Vi = 10 mV, 41.25 MHz
So + 12 dB – 1 dB
f = 41.25 MHz
f = 41.25 MHz
–65
2.0
100
2.4
0.3
23
50
60
1.2
8
8
V
5.0
–5.0
200
–1000
4.8
0.6
9
V
+1.5
V
69 mV/kHz
1.5
kΩ
5
pF
MHz
–1.0
MHz
+65
kHz
MHz
–2.0
MHz
kHz
–200
kHz
9.6 kHz/mV
1.2 kHz/mV
26
85
70
2
3
29
dB
120 mVrms
mVrms
kΩ
6
pF
Continued next page.
No.5177-3/15
LA7583
Continued from preceding page.
Parameter
[SIF Block]
SIF limiting sensitivity
FM detection output voltage
AMR
Total harmonic distortion
SIF S/N
[Mute defeat]
FM mute
AFT defeat voltage
J/U SW start voltage
AV mute voltage
Symbol
Vi (lim)
VO
AMR
THD
S/N(SIF)
V24T
VD11
VJU24
VM23
Conditions
∆f = 25 kHz, 400 Hz
Vi = 100 mV, ∆f = 25 kHz, 400 Hz
AM = 30%, 400 Hz
∆f = 25 kHz, 400 Hz
∆f = 25 kHz, 400 Hz
min
typ
max
Unit
47
300
40
59
520
55
53
400
56
0.4
59
dBµ
mVrms
dB
%
dB
0.5
3.9
1.5
1
1.0
4.5
2.0
1.5
1.5
5.1
2.5
V
V
V
V
No.5177-4/15
LA7583
Equivalent Circuit Block Diagram
Multinetwork PLL (Automatic Adjustment Control)
The LA7583’s PIF detector uses a multinetwork PLL and a buzz canceller. The multinetwork PLL is a PLL detector that was
developed in order to eliminate the need for adjustments in video detection.
This PLL detector offers the following features:
(1) Eliminates the need for adjustments in video detection.
(2) The PLL detection characteristics are unaltered.
a. Offers better waveform response characteristics in comparison with the quasi-synchronous detection method.
b. The harmonic wave component of the video signal (demodulated output) is reduced.
c. The 1/2 IF signal suppression ratio is improved.
(3) Audio buzz is greatly reduced by the buzz canceller.
A typical PLL detector consists of the blocks shown below.
In these blocks, if the VCO coil is not adjusted to the IF frequency, a phase difference will appear in the control loop. As a result,
the PLL detector detection axis will shift from the ideal 180 °. The group delay, DP characteristics, etc., deteriorate as a result.
No.5177-5/16
LA7583
[Multinetwork PLL]
The multinetwork PLL consists of the blocks shown below.
The multinetwork PLL has two VCO circuits. Each of these form a separate PLL. The operational relationship between these
circuits is as follows:
fVCO1 = fVCO2 × 8
Initially, in APC1, the phases of the IF signal and the VCO carrier are compared. The control signal derived is then used to
control VCO2. VCO1 is controlled by comparing the phases of VCO2 and VCO1 x 1/8. As a result, VCO1 always has the same
frequency as the IF signal, and the following relationship results:
fVCO1 = fVCO2 × 8
If the precision of the ceramic oscillator for fVCO2 is within the adjustment range for VCO in a typical PLL, the video detector
phase error is very small. As a result, the multinetwork PLL operates as an ideal PLL detector.
Automatic Quadrature Tuning (AQT)
A quadrature detector that is controlled automatically is used in the FM detector. The AQT in the LA7583 consists of the blocks
shown in the following diagram.
The FM detection filter (gyrator) is controlled at 4.5 MHz by the control current (Iref1) generated by reference circuit 1. At the
same time, precision control is performed by using the control current (Iref2) derived by detecting the offset from the detected
output so that the FM detector phase relationship is 90 °. As a result, automatic control makes an ideal quadrature detector
possible.
(Note) Gyrator: Circuit-formed equivalent inductance
The SIF circuit contains a 4.5 MHz tank circuit having the gyrator and an internal capacitor.
No.5177-6/15
LA7583
Pin Functions
Pin
No.
1
Symbol
Circuit Configuration
Description
Pin 1 is an audio FM output pin. A 100 Ω
resistor is connected in series with the
emitter follower.
(1) Monaural applications
CR are used to form a de-emphasis
cicuit externally.
t = CR1
FM DETECTOR
OUTPUT
(2)
2
FM AQT FILTER
GYLATOR
3
RF AGC OUTPUT
Audio multiplexing applications
Depending on the audio multiplexing
decoder application, the input
impedance is low, which may distort the
L-R signals, etc., and degrade the
stereo characteristics. In such an event,
add a resistor between pin 1 and GND.
R2 ^ 5.1 kΩ
Pin 2 is the FM Automatic Quadrature
Tuning filter pin. This pin controls the
quadrature detector so that it remains at its
center frequency (4.5 MHz), and is the point
where the two control currents are added.
If the value of external capacitor C1 is small,
the low-range frequency characteristics
deteriorate. If the capacitance is too large,
the low-range characteristics improve, but
the response characteristics at SW-ON, etc.,
worsen.
The recommended value for C1 is 10 µF to
33 µF.
Pin 3 is the RF AGC output pin. It is an
emitter output, and a protective resistor of
200 Ω is connected between pin 3 and
emitter.
This pin determines the resistance bleeder
(R1, R2) values according to the maximum
gain of the tuner.
Continued on next page.
No.5177-7/15
LA7583
Continued from preceding page.
Pin
No.
4
Symbol
IF AGC
Circuit Configuration
Description
Pin 4 is the 1st IFAGC filter pin. This filter
smoothes out the peaks detected in the
signal by the AGC detector, and generates
the AGC voltage. The 2nd AGC filter (lag
lead filter) is built in using filter technology.
The cutoff frequency is approximately
500 Hz.
AGC filter constants and AGC speed
Medium-speed AGC: R1 = 330 kΩ
C1 = 0.1 µF
High-speed AGC:
R1 = 470 kΩ
C1 = 0.056 µF
.
5
6
VIF INPUT
Pins 5 and 6 are the VIF amplifier input
pins. The VIF amplifier has three stages,
each of which uses a C cut, so when used
in conjunction with a SAW filter, DC cut by a
capacitor becomes unnecessary.
Ri = 1.1 kΩ
Ci = 3 pF
9
1st SIF INPUT
Pin 9 is the 1st SIF input pin. Input is such
that DC cut must be performed using a
capacitor. When a SAW filter, etc. is used in
the input circuit, an L that is used to
neutralize the SAW filter output capacitance
and the IC input capacitance serves to
improve the 1st SIF sensitivity.
Continued on next page.
No.5177-8/15
LA7583
Continued from preceding page.
Pin
No.
Symbol
Circuit Configuration
Description
10
VCOR
Pin 10 is the pin for connecting the resistor
that determines the impedance of the
oscillation point of the oscillating circuit by
the ceramic oscillator. Oscillation frequency
variations can be reduced by connecting a
resistor with a tolerance of 1% between pin
10 and pin 12.
11
AFT OUTPUT
Pin 11 is the AFT output pin. This pin
determines the gain (control sensitivity: β
(kHz/mV)) according to the R1 and R2
bleeder resistance values. β is decreased in
weak electric fields by AGC voltage in order
to reduce malfunction of AFT. R1 and R2
must be 200 kΩ or less.
AFT curve for medium/
strong electric fields
AFT curve for weak
electric fields
12
VCO2
Pin 12 is the ceramic oscillator (VCO2) pin.
A series resonance-type oscillator is used to
oscillate 1/8 of the IF signal.
Japan = 58.75 MHz × 1/8
U.S. = 45.75 MHz × 1/8
Continued on next page.
No.5177-9/15
LA7583
Continued from preceding page.
Pin
No.
Symbol
Circuit Configuration
Description
13
14
VCO COIL
Pins 13 and 14 are the VCO tank circuit.
VCO coil recommended
Japan
1.2 µH
U.S.
1.8 µH
Make the circuit pattern between the IC and
the coil as short as possible.
15
VIDEO OUTPUT
Pin 15 is the SIF carrier (4.5 MHz)-contained
video output pin. The level of the video
output is approximately 1.5 Vp-p.
16
APC1 FILTER
Pin 16 is the APC1 filter pin. The filter
smoothes the output after comparing the
phase of the IF signal with that of VCO1 in
APC1.
..
C1 = 0.47 µF
R1 = 330 to 560Ω
C2 = 470 pF
Continued on next page.
No.5177-10/15
LA7583
Continued from preceding page.
Pin
No.
17
Symbol
EQUALIZER INPUT
Circuit Configuration
Description
Pin 17 is the equalizer amplifier input pin. A
signal which has passed through a 4.5 MHz
trap is input through pin 17 and is output
through pin 19.
The input level of pin 17 is 1.5 Vp-p. This
is amplified 3 dB to 2 Vp-p by the
equalizer amplifier.
.
18
EQUALIZER FILTER
Pin 18 is the equalizer pin. The equalizer
amplifier is of the voltage follower type with
a voltage gain of 3 dB. To correct the
frequency characteristics, connect LCR
externally.
The operating characteristics are as follows:
Ve
R1
Av =
=1+
(times)
Vi
Z
19
EQUALIZER
OUTPUT
Pin 19 is the equalizer amplifier output pin.
This output has a built-in low-impedance
drive circuit.
Continued on next page.
No.5177-11/15
LA7583
Continued from preceding page.
Pin
No.
Symbol
Circuit Configuration
Description
21
1st SIFOUT
Pin 21 is the 1st SIF output pin. The SIF
carrier output level is approximately
50 mVrms.
22
APC2 FILTER
Pin 22 is the APC2 filter pin. The filter
smoothes the output after comparing the
phase of VCO2 with that of VCO1 x 1/8 in
APC2.
C1 = 0.47µF
R1 = 33 Ω
23
RF AGC VR
Pin 23 is the RF AGC adjusting pin. The
adjustment point is where Rv approximates
15 kΩ. AV (audio/video) mute is effected by
dropping this pin to GND.
Continued on next page.
No.5177-12/15
LA7583
Continued from preceding page.
Pin
No.
24
Symbol
Circuit Configuration
SIF INPUT, J/U SW
Description
Pin 24 is used both for SIF input and J/U
SW audio mute.
The input impedance is approximately
1.5 kΩ.
J/U (Japan/U.S.) switch
The oscillating frequency for VCO2 in
Japan and the U.S. differs. However, the
center frequency of the SIF detector is
controlled using VCO2 as a reference. As
a result, the filter control mode can be
changed either by leaving this pin open or
dropping it to GND through a 3.9 kΩ
resistor.
Open: Japan mode
3.9 kΩ: U.S. mode
Audio mute:
Audio muting can be applied by dropping
the voltage on this pin to 0.5 V or less.
.
.
.
LA7583 VCO COIL design considerations
1. Design criteria
Allow for an adequate variable range for the IF frequency in the design. Specifically, select a coil value so that the carrier
frequency is roughly in the center of the characteristics diagram shown below when 2 V and 4 V are applied to pin 22.
2. Design notes
a. When selecting the L value, the LA7583 must be soldered directly on the board. If an IC socket is used, an error in the VCO
center frequency will arise from the capacitance of the socket.
b. The patterns for pins 13 and 14 must be made as short as possible (15 mm or less). Minimize the effect of the printed
pattern.
c. A VCO coil of which tolerance is ± 5% must be used.
3. Measuring the IF frequency range
Drop the IF AGC (pin 4) to GND. Next, pick up the VCO carrier leak at a pin other than the VCO coil (pins 13 and 14) and
read the carrier frequency. And then, apply a voltage ranging from 1.5 V to 4.5 V to pin 22, and record the characteristics of the
maximum variable frequency range for VCO as shown in the diagram below.
JAPAN fO : 58.75 MHz
fO − MHz
fO − MHz
US fO : 45.75 MHz
Y22 − V
4. Recommended VCO coil
A. Tokyo Parts Industry Co., Ltd.
Y22 − V
5LC
JAPAN
U.S.
1.2 µH ± 5%
1.8 µH ± 5%
No.5177-13/15
LA7583
Notes on Sanyo SAW Filters
There are two types of filters, depending on the piezoelectric substrate material.
(1) LiTaO3 (lithium tantalate) SAW filters: .......TSF1xxx
TSF2xxx
While the LiTaO3 SAW filters offer excellent stability with a low temperature coefficient of –18 ppm/ °C, the insertion
loss is high. However, by using a coil, etc., to obtain proper matching on the SAW filter output side (which does increase
the number of external components), it is possible to suppress the insertion loss while at the same time making the level
of the characteristics variable, which provides additional design freedom. (Refer to Fig. 13.) In addition, because the SAW
(surface wave) reflection is small, ripple within the band can be kept low.
(2) LiNbO3 (lithium niobate) SAW filter: ......TSF5xxx
While the LiNbO3 SAW filter has a high temperature coefficient of –72 ppm/ °C, it has a lower insertion loss by about 10
dB compared to the LiTaO3 SAW filters. Therefore, matching on the output side of the SAW filter is not necessary. (Refer
to the diagram below.) In addition, because the insertion loss is low (although the ripple within the band is somewhat
higher than in the case of the LiTaO3 SAW filter), the low impedance and small feedthrough diminish the effects of
peripheral circuit components and the pattern layout, and make it possible to stabilize the trap characteristics outside of
the band.
From the above, it is clear that the LiTaO3 SAW filter is suitable for Japan and U.S. bands where the IF frequency is
high, while the LiNbO3 SAW filter is suitable for PAL and U.S. bands where the IF frequency is low.
LiTaO3 SAW Filter
LiNbO3 SAW Filter
(a) Picture wide BAND SAW Filter
Japan
TSF1137U
U.S.
TSF1241U(with IS-31 Trap)
(b) INTER Carrier SAW Filter
Japan
TSF1138P
U.S.
TSF1220P
No.5177-14/15
LA7583
Test circuit Diagram
LA7583 (U.S.)
*2
*1
*1. TDK ceramic oscillator FCR5.71M2SF3
*2. Micro-inductor 5LC1R8, made by Tokyo Parts Industry Co., Ltd.
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:
1 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:
2 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, 1995. Specifications and information herein are subject to change without notice.
No.5177-15/15
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