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Ordering number : ENN6276B
Monolithic Linear IC
LA75675M-S
VIF/SIF IF Signal-Processing Circuit that Supports NTSC Intercarrier for TV and VCR Products
Overview
The LA75675M-S is an NTSC intercarrier VIF/SIF IC that adopts a semi-adjustment-free structure. In particular, it uses VCO adjustment to make AFT adjustment unnecessary and thus simplifies the overall adjustment process. A PLL-based technique is adopted for FM detection. The 5 V supply voltage provides compatibility with other multimedia systems. In addition it achieves high audio quality by incorporating a built-in buzz canceller that suppresses Nyquist buzz.
Features
* No AFT or SIF coils are used, thus eliminating adjustments. * Excellent audio performance due to the built-in buzz canceller. * VCC = 5 V and a low power dissipation of 250 mW.
Package Dimensions
unit: mm 3112A-MFP24S
[LA75675M-S]
24 13
Functions
[VIF] * VIF amplifier * PLL detector * BNC * RF AGC * EQ amplifier * AFT * IF AGC * Buzz canceller [SIF] * Limiter amplifier * PLL FM detector
5.4
Allowable power dissipation, Pdmax -- W
When mounted on a 65 x 72 x 1.6 mm3 paper-phenol printed circuit board
720
12.5 1.5
0.15
700 600
0.35 1.0
500 400 300 200 100 0 -20
420
0.1
(0.75)
Independent IC
SANYO: MFP24S
0
20
40
60
70
80
100
Ambient temperature, Ta -- C
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 Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
51500RM (OT) No. 6276-1/13
0.63
800
1.7max
Pd max - Ta
1
12
7.6
LA75675M-S
Specifications
Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Circuit voltage Symbol VCC max V13, V17 I6 Circuit current I10 I24 Allowable power dissipation Operating temperature Storage temperature Pd max Topr Tstg Ta 50C, independent IC *: Mounted on a PCB. Conditions Ratings 6 VCC -3 -10 -2 420 720 -20 to +70 -55 to +150 Unit V V mA mA mA mW mW C C
*: A 65 x 72 x 1.6 mm3 paper-phenol printed circuit board
Operating Conditions at Ta = 25C
Parameter Recommended supply voltage Operating voltage range Symbol VCC VCCop Conditions Ratings 5 4.5 to 5.5 Unit V V
Electrical Characteristics at Ta = 25C, VCC = 5.0 V, fp = 45.75 MHz
Parameter [VIF Block] Circuit current Maximum RF AGC voltage Minimum RF AGC voltage Input sensitivity AGC range Maximum allowable input No-signal video output voltage Sync signal tip voltage Video output level Black noise threshold voltage Black noise clamp voltage Video signal-to-noise ratio C-S beating Frequency characteristics Differential gain Differential phase No-signal AFT voltage Maximum AFT voltage Minimum AFT voltage AFT detection sensitivity VIF input resistance VIF input capacitance APC pull-in range (U) APC pull-in range (L) AFT tolerance frequency 1 VCO 1 maximum variability range (U) VCO 1 maximum variability range (L) VCO control sensitivity I5 V14H V14L VIN GR VINmax V6 V6 tip VO VBTH VBCL S/N IC-S fC DG DP V13 V13H V13L Sf RIN CIN fPU f dfa 1 dfu dfl B 1.3 -150 1.5 45.75 MHz 45.75 MHz 1.3 2.0 4.0 0 28 6 MHz S1 = OFF 32 58 95 3.5 0.9 1.7 0.5 1.6 48 38 -3.0 32 VCC - 0.5 40 VCC 0 38 63 100 3.8 1.2 2.0 0.8 1.9 52 43 -1.5 3.0 3 2.5 4.4 0.18 40 1.5 3 2.0 -2.0 0 2.0 -2.0 2.7 -1.5 5.4 -1.4 +150 6.5 5 3.0 5.0 1.00 52 4.1 1.5 2.3 1.1 2.2 0.5 44 48 mA V V dBV dB dBV V V Vp-p V V dB dB dB % deg V V V mV/kHz k pF MHz MHz kHz MHz MHz kHz/mV Symbol Conditions Ratings min typ max Unit
Continued on next page.
No. 6276-2/13
LA75675M-S
Continued from preceding page.
Parameter [SIF Block] Limiting sensitivity FM detection output voltage AMR rejection ratio Total harmonic distortion SIF signal-to-noise ratio 4.5 MHz output level Vli (lim) VO (FM) AMR THD S/N (FM) Vsout SIF IN 80 dBV 59 82 4.5 MHz 25 kHz *1 39 400 50 45 520 60 0.3 64 89 96 0.8 51 660 dBV mVrms dB % dB dBV Symbol Conditions Ratings min typ max Unit
Note: 1. The FM detection output level can be reduced and the FM dynamic range improved by inserting the resistor R in series with the capacitor between pin 23 and ground.
Pin Arrangement
SIF INPUT BIAS FILTER SIF OUT NC VCC VIDEO OUT EQ FILTER EQ INPUT APC FILTER
1 2 3 4 5 6
24 FM DET OUT 23 FM FILTER 22 BPF-OUT 21 RF AGC VR 20 GND 19 VIF INPUT
LA75675M-S
7 8 9 18 VIF INPUT 17 1st AGC FILTER 16 2nd AGC FILTER 15 2nd AGC FILTER 14 RF AGC OUT 13 AFT OUT
VIDEO DET OUT 10 VCO COIL 11 VCO COIL 12
Top view
A12615
No. 6276-3/13
LA75675M-S Internal Equivalent Circuit and External Circuits
IF IN PUT AFT OUTPUT
0.01 F
10 k-B
0.015 F
AUDIO OUT PUT 7.5 k 1 F 0.01 F
RFAGC VR SAW(P) 0.01 F
RF AGC OUT PUT 0.01 F 330 pF
+
24
23
22
21
20
19
18
17
16
15
14
13
100
6.8 k
V 1 k 1 k
4.7 k 10 k 1 k
10 k
500
1 k1 k 1.2 k 1 k V 10 k 4 k 200 1 k 2.2 k 9.2 k 1V 200 1.2 k
12
V
1
2
3
4
5
6
7
8
9
10
11
0.47 F
1 F
+ 150
0.01 F
1 F
2.2 k
BPF 4.5 MHz
330
+
330
R
120 k 120 k 1 k VCO COIL VCC GND
300
1 k
VIDEO OUT
Note: Resistor R must have a value of 470 or larger.
2 k
1 k
30 k
V
0.01 F
A12616
No. 6276-4/13
LA75675M-S AC Characteristics Test Circuit
4.5 MHz (E) 10 k-B RF AGC VR 7.5 k 1 F +
23 22
VIF IN 51 IF AGC 0.01 F 0.01 F 0.015 F (M) 0.01 F 0.01 F 1000 pF RF AGC OUT (F) AFT OUT (B) 120 k 120 k V
0.01 F
(M) 0.01 F
24
21
20
19
18
17
16
15
330 pF
14
FM DET OUT (D)
GND
13
6.8 k RF AGC IF AGC VIF AMP
FM DET
6 dB HPF LIM AMP
VIDEO DET
AFT
EQ AMP 0.01 F 0.01 F + 1 F + + S1 100 k 1.5 k 150 0.47 F
1 2 3 4 5 6 7 8 9 10 11
VCO
12
51
24 pF
2nd SIF IN
SIF.OUT
VIDEO OUT (A)
560
330
VCC GND
A12617
Test Circuit
Impedance analyzer
VIF IN 0.01 F 0.01 F 0.01 F 0.01 F 10 k 0.01 F 0.01 F 0.01 F 0.01 F 0.01 F
14 11
24
23
22
21
20
19
18
17
16
15
13
LA75675M-S
1
2
3
4
5
6
7
8
9
10
12
0.01 F
0.01 F
330
0.01 F
100 F
+
VCC
A12618
No. 6276-5/13
LA75675M-S Sample Application Circuit NTSC
4.5 MHz OUT 50 k-VR 1000 pF IN PUT RF AGC OUT 330 pF 0.01 F
0-10 k 1F
0.015 F (M)
0.01 F (M)
GND
22 21 20 19 18
24
23
17
16
15
14
13
6.8 k
FM DET RF AGC LIM AMP IF AGC VIF AMP
AFT 6 dB VIDEO DET
HPF EQ AMP
1 2 3 4 5 6 7 8 9 10 11
VCO
12
0.01 F
+ BPF 4.5 MHz 330 1 F
15 H
330 VCC GND VIDEO OUT 2.2 k
560
1 F
+
+
0.47 F
120 k 120 k
VCC 30 k
VCC
1000 pF
0.01 F (M)
AF OUT
7.5 k
SAW(P)
+
AFT OUT
A12619
No. 6276-6/13
LA75675M-S Pin Functions
Pin No. Pin Function Equivalent circuit
SIF input The input impedance is about 1 k. Since interference signals* entering this input can result in buzzing and beat signals, the pattern layout for the signal input to this pin must be designed carefully. *: Signals that can interfere with audio include video and chrominance signals. Thus the VIF carrier signal can cause interference.
1 k
1
1
SIF input
1 k 1 k
A12620
4.2 V
10 k
The FM detector signal-to-noise ratio can be improved by inserting a filter in the FM detector bias line. 2 FM power supply filter C1 must be 0.47 F or higher, and we recommend 1 F. If the FM detector is not used, a 2 k resistor must be inserted between pin 2 and ground. This stops the FM detector VCO circuit.
2
4 k C1
TO VCO BIAS
14 k
A12621
3
SIF out
Outputs the intercarrier detector output that has been passed through a high-pass filter. (4.5 MHz output)
200
3
A12622
4 5
NC VCC
This pin should be left open. Use lines that are as short as possible for VCC/ground decoupling.
Continued on next page.
No. 6276-7/13
LA75675M-S
Continued from preceding page.
Pin No. Pin Function Equivalent circuit
40 k
Equalizer circuit This circuit corrects the frequency characteristics of the video signal. Pin 8 is the input to the EQ amplifier. The EQ amplifier takes a 1.5 Vp-p video signal as its input and amplifies that to a 2.0 Vp-p level. * Notes on the equalizer amplifier design The equalizer amplifier is designed as a voltage follower amplifier with a gain of about 2.3 dB. If frequency characteristics correction is required, insert the capacitor, inductor, and resistor between pin 7 and ground in series. 6 7 8 EQ amp * Using the equalizer amplifier If the input signal is vi and the output signal vo, then R1 ---- +1 Z (Vi + Vin) = Vo x G
2.2 k
1 k
6
EQ OUTPUT
9.2 k
7
C L =Z R
A12623
G: Gain of the voltage follower amplifier Vin: Imaginary voltage G: About 2.3 dB Assuming Vin 0, then AV will be: VoG R1 AV = ---- = ---- + 1 Vi Z R1 is an IC internal 1 k resistor. Simply select a value of Z according to the desired characteristics. However, note that the equalizer amplifier gain will be a maximum at the Z resonance, so care is required to prevent distortion from occurring.
EQ INPUT
8
200 AGC
A12624
FROM APC DET
PLL detector APC filter connection The APC time constant is switched internally by the IC. When locked, the VCO is controlled by the route A, and the gain is reduced. When unlocked or during weak field reception, the VCO is controlled by the route B, and the gain is increased.
A 1 k 1 k 1 k
9
APC filter
We recommend the following values for this APC filter: R = 150 to 390 C = 0.47 F.
B
9
R
C
+
A12625
Continued on next page.
No. 6276-8/13
LA75675M-S
Continued from preceding page.
Pin No. Pin Function Equivalent circuit
2 k
Outputs a video signal that includes the SIF carrier. A resistor must be inserted between pin 10 and ground to acquire adequate drive capability. R 470
10
Composit video output
15 pF 1.5 pF
10
300
A12626
11
VCO tank circuit for video detection 11 12 VCO tank See the separately provided coil specifications for details on the tank circuit. This VCO is a vector synthesis VCO circuit.
12
A12627
AFT output This circuit includes a function that controls the AFT voltage so that it naturally goes to the center voltage during weak field reception. A 120 k bleeder resistor is built in. Note that the sensitivity can be lowered by attaching an external resistor.
120 k
13
AFT output
1 k
13
120 k
A12628
RF AGC output This output controls the tuner RF AGC. The internal circuit includes both a 30 k pull-up resistor and a 100 protective resistor. Determine the value of the external bleeder resistor to match the specifications of the tuner.
14
RF AGC output
To tuner
100
14
30 k
A12629
Continued on next page.
No. 6276-9/13
LA75675M-S
Continued from preceding page.
Pin No. Pin Function Equivalent circuit
15 16
IF AGC filter connection 15 16 17 AGC filter The AGC voltage is created by smoothing the signal that results from peak detection by the AGC detector at pins 17 (first AGC), and 15 and 16 (second AGC). The video signal input to this IF AGC detector is a signal that was passed through the audio trap circuit.
6.8 k 35 k
17
1 k 27 k
A12630
18
VIF amplifier input 18 19 VIF input The input circuit is a balanced input, and its input impedance is due to the following component values. R 1.5 k C 3 pF
19
2 k
A12631
20
GND
Continued on next page.
No. 6276-10/13
LA75675M-S
Continued from preceding page.
Pin No. Pin Function Equivalent circuit
4.2 V
RF AGC adjustment 21 RF AGC VR This pin sets the tuner's RF AGC operating point. Both the FM output and the video output can be muted by setting this pin to the ground level.
20 k
20 k
560
21
A12632
Bandpass filter output 22 BPF-out The output to the external bandpass filter is passed through an internal 6 dB amplifier before being output.
200
22
A12633
Filter that holds the FM detector output DC voltage fixed. Normally, a 1 F electrolytic capacitor is used. If the low band (around 50 Hz) frequency characteristics are of concern, this value should be increased. The FM detection output level can be reduced and the FM dynamic range improved by inserting the resistor R in series with the capacitor between pin 23 and ground.
23
FM filter
1 k
1 k
23
R
C
+
A12634
24
FM detector output
Audio FM detector output This is an emitter-follower circuit with a 300 resistor inserted in series. * Stereo applications In some application that provide input to a stereo decoder, the input impedance may be reduced, resulting in distortion in the L-R signal and degraded stereo characteristics. If this problem occurs, add a resistor between pin 24 and ground. R1 5.1 k * Mono applications Construct an external deemphasis circuit. t = CR2
R2
24
300 10 k
C
R1
A12635
No. 6276-11/13
LA75675M-S Notes on Sanyo SAW Filters There are two types of SAW filters, which differ in the piezoelectric substrate material used, as follows: * 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 low 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. * With the tuning set to the IF frequency * With the tuning set to the vicinity of S and C
The high band response is reduced
SAW filter characteristics The high band is extended
Frequency
Frequency
A12636
Coil Specifications
JAPAN VCO coil S f = 58.75 MHz t=5t 0.12 o C = 24 pF S US f = 45.75 MHz t=6t 0.12 o C = 24 pF S PAL f = 38.9 MHz t=7t 0.12 o C = 24 pF
A12637
A12638
A12639
Prototype no. V291XCS-3220Z The Toko Electric Corporation SAW filter (SPLIT) SAW filter (INTER) Picture TSF1137U Sound
Prototype no. 291XCS-3188Z The Toko Electric Corporation Picture TSF1241 Sound TSF5220, TSF5221
Prototype no. 292GCS-7538Z The Toko Electric Corporation Picture TSF5315 Sound TSF5321, TSF5344
The Toko Electric Corporation 2-1-17 Higashi Yukigaya Ota-ku, Tokyo Telephone: +81-3-3727-1167
No. 6276-12/13
LA75675M-S Notes on VCO Transformer Circuits * Built-in capacitor VCO transformer circuits When power is first applied, the heat generated by the IC is transmitted through the printed circuit board to the VCO transformer. However, the VCO coil frame functions as a heat sink and dissipates the heat from the IC. As a result, it is relatively difficult to transmit heat to the VCO transformer's built-in capacitor, and drift at power on is minimal. 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 transformer circuits When an external capacitor is used, the 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 power is applied, the coil is not influenced as much by this heat, and as a result, the power-on drift is larger. 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.
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 May, 2000. Specifications and information herein are subject to change without notice. PS No. 6276-13/13

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