LA75600VA [SANYO]
Monolithic Linear IC IF Signal Processing (VIF/SIF) IC for use in TV/VCR Applications; 单片线性IC中频信号处理（ VIF / SIF） IC，适用于电视使用/录像机的应用
| 型号： | LA75600VA |
| 厂家： | 
SANYO SEMICON DEVICE |
| 描述： | Monolithic Linear IC IF Signal Processing (VIF/SIF) IC for use in TV/VCR Applications |
| 文件： | 总16页 (文件大小：386K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Ordering number : ENA0325
Monolithic Linear IC
IF Signal Processing (VIF/SIF) IC
for use in TV/VCR Applications
LA75600VA
Overview
The LA75600VA is a NTSC intercarrier support VIF/SIF signal-processing IC that makes the minimum number of
adjustments possible. 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 5V 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.
Functions
• VIF Block :VIF Amplifier, Buzz Canceller, PLL Detector, IF AGC, RF AGC, AFT, Equalizer Amplifier
• SIF Block :Limiter Amplifier, PLL FM detector
Specitications
Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Circuit voltage
Symbol
max
Conditions
Ratings
Unit
V
V
6
CC
V
, V
V
V
13 17
CC
-3
Circuit current
I
mA
mA
W
6
I
-10
10
Allowable dissipation
Operating temperature
Storage temperature
Pd max
Topr
Ta≤70°C *
640
-20 to +70
-55 to +150
°C
°C
Tstg
* Mounted on a board:114.3×76.1×1.6mm3 glass epoxy board.
Recommended Operating Conditions at Ta = 25°C
Parameter
Recommended supply voltage
Operating supply voltage
Symbol
Conditions
Ratings
Unit
V
V
5
CC
V
op
4.5 to 5.5
V
CC
Any and all SANYO Semiconductor 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 Semiconductor representative
nearest you before usingany SANYO Semiconductor products described or contained herein in such
applications.
SANYO Semiconductor 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 Semiconductor
products described or contained herein.
00000 / 60506 MS OT 20060125-S00004 No.A0325-1/16
LA75600VA
Electrical Characteristics at Ta = 25°C, V
= 5V, fp = 45.75MHz
CC
Ratings
typ
Parameter
Symbol
Conditions
Unit
No.
min
max
[VIF block]
Circuit current
I
V1
V2
35
42
52
mA
V
5
Maximum RF AGC voltage
Minimum RF AGC voltage
Input sensitivity
V
H
L
V
-0.5
V
14
CC
CC
0
V
V3
0.5
44
V
14
V
S1 = OFF
V4
32
51
38
56
dBµV
dB
i
AGC range
GR
V5
Maximum allowable input
No-signal video output voltage
Sync. signal tip voltage
Video output level
V max
i
V6
95
100
3.4
1.1
2.0
0.5
1.6
52
dBµV
V
V
6
V7
3.1
0.8
1.7
0.3
1.3
48
3.7
1.4
2.3
0.7
1.9
V tip
6
V8
V
V
V9
Vp-p
V
O
Black noise threshold voltage
Black noise clamp voltage
Video S/N
V
V10
V11
V12
V13
V13
V15
V16
V17
V18
V19
V20
V21
V22
V23
V24
V25
V26
V27
V28
V29
BTH
V
V
BCL
S/N
IC-S
fc
dB
C-S beat
38
43
dB
Frequency characteristics
Differential gain
6MHz
-3
-1.5
3.0
3
dB
DG
DP
6.5
5
%
Differential phase
deg
V
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
VCO1 maximum variable range (U)
VCO1 maximum variable range (L)
VCO control sensitivity
RF AGC input level
[SIF block]
V
2.0
4.0
0
2.5
4.4
0.18
29
3.0
5.0
1.0
38
13
V
H
V
13
V
L
V
13
Sf
Ri
Ci
19
mV/kHz
kΩ
45.75MHz
45.75MHz
1.5
3
pF
fpu
fpl
1.3
2.0
-2.0
0
MHz
MHz
kHz
MHz
MHz
kHz/mV
dBµV
-1.4
∆fa1
dfu
dfl
-150
1.0
+150
1.5
-2.0
2.7
94
-1.5
5.4
B
1.3
87
V RFAGC
R = 5.1kΩ
101
i
Limiting sensitivity
V (lim)
li
S1
S2
S3
S4
S5
S6
39
767
50
45
1000
60
51
dBµV
mVrms
dB
FM detection output voltage
AMR
V
(FM)
4.5MHz 25kHz
4.5MHz 15kHz
SIF IN 80dBµV
1280
O
AMR
THD
Distortion factor
0.5
64
1.0
%
SIF S/N
S/N(FM)
Vsout
59
87
dB
4.5MHz output level
94
101
dBµV
*:If the dynamic range of the FM detection output needs to be widened, connect a resistor and a capacitor in series between pin 23 and GND for level
adjustment.
*:The resistor between pin10 and GND must be 470Ω or more.
No.A0325-2/17
LA75600VA
Package Dimensions
unit : mm
3287
6.5
24
13
12
1
0.5
0.22
0.15
(0.5)
SANYO : SSOP24(225mil)
Pin Assignment
No.A0325-3/17
LA75600VA
Block Diagram and AC Characteristics Test Circuit
Test Circuit
Input impedance test circuit (VIF, 1st SIF input impedance)
No.A0325-4/17
LA75600VA
Test Conditions
……
V1. Circuit current
(1) Internal AGC
[I ]
5
(2) Input a 45.75MHz 10mVrms continuous wave to the VIF input pin.
(3) RF AGC Vr MAX
(4) Connect an ammeter to the V
CC
and measure the incoming current.
……
V2. V3. Maximum RF AGC voltage, Minimum RF AGC voltage
(1) Internal AGC
[V H, V1 L]
14
4
(2) Input a 45.75MHz 10mVrms continuous wave to the VIF input pin.
(3) Adjust the RF AGC Vr (resistance value max.) and measure the maximum RF AGC voltage. (F)
(4) Adjust the RF AGC Vr (resistance value min.) and measure the minimum RF AGC voltage. (F)
……
V4. Input sensitivity
(1) Internal AGC
[V ]
i
(2) fp = 45.75MHz 15kHz 78% AM (VIF input)
(3) Turn off the S1 and put 100kΩ through.
(4) VIF input level at which the 400Hz detection output level at test point A becomes 0.64Vp-p.
……
V5. AGC range
[GR]
(1) Apply the V
voltage to the external AGC, IF AGC (pin 17).
CC
(2) In the same manner under the same conditions as for V (input sensitivity), measure the VIF input level at which
4
the detection output level becomes 0.64Vp-p − Vil.
(3)
……
V6. Maximum allowable input
(1) Internal AGC
[V max]
i
(2) fp = 45.75MHz 15kHz 78% AM (VIF input)
(3) VIF input level at which the detection output level at test point A becomes video output (V ) 1dB.
O
……
V7. No-signal video output voltage
[V ]
6
(1) Apply the V voltage to the external AGC, IF AGC (pin 17).
CC
(2) Measure the DC voltage at the VIDEO output (A).
……
V8. Sync. signal tip voltage
(1) Internal AGC
[V tip]
6
(2) Input a 45.75MHz 10mVrms continuous wave to the VIF input pin.
(3) Measure the DC voltage at the VIDEO output (A).
……
V9. Video output level
(1) Internal AGC
[V ]
O
(2) fp = 45.75MHz 15kHz 78% AM V = 10mVrms (VIF input)
i
(3) Measure the peak value of the detection output level at test point A. (Vp-p)
No.A0325-5/17
LA75600VA
……
V10. V11 Black noise threshold level and clamp voltage
[V
, V ]
BTH BCL
(1) Apply DC voltage to the external AGC, IF AGC (pin 17) and vary it.
(2) fp = 45.75MHz 15kHz 78% AM10mVrms (VIF input)
(3) Adjust the IF AGC (pin 17) voltage to operate the noise canceller.
Measure the VBTH, VBCL at test point A.
V
BCL
Video output
(V)
V
BTH
Time
……
V12. Video S/N
(1) Internal AGC
(2) fp = 45.75MHz continuous wave = 10mVrms (VIF input)
(3) Measure the noise voltage at test point A in RMS volts through a 10kHz to 4MHz band-pass filter.
……
[S/N]
Noise voltage (N)
(4)
……
V13. C/S beat
[IC-S]
(1) Apply DC voltage to the external AGC IF AGC (pin 17) and vary it.
(2) fp = 45.75MHz continuous wave;10mVrms
fc = 42.17MHz continuous wave;10mVrms − 10dB
fs = 41.25MHz continuous wave;10mVrms − 10dB
(3) Adjust the IF AGC (pin 17) voltage so that the output level at test point A becomes 1.3Vp-p.
(4) Measure the difference between the levels for 3.58MHz and 0.92MHz components at test point A.
C/S beat
Output
(dB)
0.92MHz
3.58M 4.5M
Frequency (MHz)
No.A0325-6/17
LA75600VA
……
V14. Frequency characteristics
[fc]
(1) Apply DC voltage to the external AGC IF AGC (pin 17) and adjust the voltage.
(2) SG1:45.75MHz continuous wave 10mVrms
SG2:45.65MHz to 39.75MHz continuous wave 2mVrms
Add the SG1 and SG2 signals using a T pat and adjust each SG signal level so that the above-mentioned levels are
reached, and input the added signals to the VIF IN.
(3) First set the SG2 frequency to 45.65MHz, and then adjust the IF AGC voltage (V17) so that the output level at test
……
point A becomes 0.5Vp-p.
V1
……
(4) Set the SG2 frequency to 39.75MHz and measure the output level.
V2
(5) Calculate as follows:
……
V15. V16. Differential gain, Differential phase
(1) Internal AGC
[DG, DP]
(2) fp = 45.75MHz APL50% 87.5% modulation video signal V = 10mVrms
i
(3) Measure the DG and DP at test point A
……
V17. No-signal AFT voltage
(1) Internal AGC
[V ]
13
(2) Measure the DC voltage at the AFT output (B).
……
V18.V19.V20 Maximum minimum AFT output voltage, AFT detection sensitivity
[V H, V L, Sf]
13 13
(1) Internal AGC
(2) fp = 45.75MHz 1.5MHz Sweep = 10mVrms (VIF input)
……
……
V10L
(3) Maximum voltage
V10H, minimum voltage
……
(4) Measure the frequency deviation at which the voltage at test point VB changes from V1 to V2
∆f
AFT output
(V)
∆f
V
H
13
V1;3.5V
V2;1.5V
V
L
13
IF frequency (MHz)
……
V21.V22 VIF input resistance, Input capacitance
[Ri, Ci]
(1) Referring to the input impedance Test Circuit, measure Ri and Ci with an impedance analyzer.
No.A0325-7/17
LA75600VA
……
V23.V24 APC pull-in range
(1) Internal AGC
[fpu, fpl]
(2) fp = 39MHz to 51MHz continuous wave ; 10mVrms
(3) Adjust the SG signal frequency to be higher than fp = 45.75MHz to bring the PLL to unlocked state.
Note; The PLL is assumed to be in unlocked state when a beat signal appears at test point A.
……
(4) When the SG signal frequency is lowered, the PLL is brought to locked state again.
(5) Lower the SG signal frequency to bring the PLL to unlocked state.
f1
……
(6) When the SG signal frequency is raised, the PLL is brought to locked state again.
(7) Calculate as follows:
f2
fpu = f1 − 45.75MHz
fpl = f2 − 45.75MHz
……
V25. AFT tolerance frequency 1
(1) Internal AGC
[∆fa1]
(2) SG1:43.75MHz to 47.75MHz variable continuous wave 10mVrmns
(3) Adjust the SG1 signal frequency so that the AFT output DC voltage (test point B) becomes 2.5V; that SG1 signal
frequency is f1.
(4) External AGC (Adjust the V .)
17
(5) Apply 9V to the IFAGC (pin 17) and then pick up the VCO oscillation frequency from the GND, etc.; that
frequency is f2.
(6) Calculate as follows: AFT tolerance frequency ∆fa1 = f2 − f1 (kHz)
……
V26.V27 VCO Maximum variable range (U, L)
[dfu, dfl]
(1) Apply the V voltage to the external AGC, IF AGC (pin 17).
CC
(2) Pick up the VCO oscillation frequency from the VIDEO output (A), GND, etc. and adjust the VCO coil so that the
frequency becomes 45.75MHz.
(3) fl is taken as the frequency when 1V is applied to the APC pin (pin 9). In the same manner, fu is taken as the
frequency when 5V is applied to the APC pin (pin 9).
dfu = fu − 45.75MHz
dfl = fl − 45.75MHz
……
V28. VCO control sensitivity
[β]
(1) Apply the V voltage to the external AGC, IF AGC (pin 17).
CC
(2) Pick up the VCO oscillation frequency from the VIDEO output (A), GND, etc. and adjust the VCO coil so that the
frequency becomes 45.75MHz.
(3) f1 is taken as the frequency when 2.8V is applied to the APC pin (pin 9). In the same manner, f2 is taken as the
frequency when 3.0V is applied to the APC pin (pin 9).
……
V29. RF AGC input level
(1) Internal AGC.
[V RFAGC]
i
(2) fp = 45.7MHz continuous wave (VIF input)
(3) Measure the input level at which the pin 14 voltage becomes 2.5V with the RF AGC resistance (pin 21 to GND)
being 5.1kΩ.
……
S1. SIF limiting sensitivity
[Vi(lim)]
(1) Apply the V voltage to the external AGC, IF AGC (pin 17).
CC
(2) fs = 4.5MHz fm = 400Hz ∆f = 25kHz (SIF input V = 100mVrms)
i
……
(3) Set the SIF input level to 100mVrms and measure the level attest point D.
V
1
(4) Lower the SIF input level and measure the input level that becomes V − 3dB.
1
……
S2.S4 FM detection output voltage, Distortion factor
[V (FM), THD]
O
(1) Apply the V voltage to the external AGC, IF AGC (pin 17).
CC
(2) fs = 4.5MHz fm = 400Hz ∆f = 25kHz (SIF input)
(3) Measure the FM detection output voltage and the distortion rate at test point D.
No.A0325-8/17
LA75600VA
……
S3. AM rejection ratio
[AMR]
(1) Apply the V voltage to the external AGC, IF AGC (pin 17).
CC
(2) fs = 4.5MHz fm = 400Hz AM = 30% (SIF input V = 100mVrms)
i
……
(3) Measure the output level at test point D.
VAM
(4)
……
S5. SIF S/N
[S/N]
(1) External AGC (V = V ).
17 CC
(2) fs = 4.5MHz NO MOD V = 100mVrms
i
……
(3) Measure the output level at test point D.
Vn
(4)
……
S6. 4.5MHz output level
[Vsout]
(1) External AGC (V = V ).
17 CC
(2) fs = 4.5MHz NO MOD V = 10mVrms
(3) Measure the output level at test point E.
i
……
Vsout
Note 1) Unless otherwise specified for VIF test, apply the V
oscillation occurs at 45.75MHz.
voltage to the IF AGC and adjust the VCO coil so that
CC
Note 2) Unless otherwise specified, turn ON the SW1.
No.A0325-9/16
LA75600VA
Sample Application Circuit
NT INTER
No.A0325-10/16
LA75600VA
Pin Function
Pin No.
Pin name
Function
Equivalent circuit
1
SIF INPUT
SIF input.
The input impedance is about 1kΩ.
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.
2
BIAS FILTER
The FM detector signal-to-noise ratio can be improved
by inserting a filter in the FM detector bias line.
C1 must be 0.47µF or higher, and we recommend 1µF.
If the FM detector is not used, a 2 kΩ resistor must be
inserted between pin 2 and ground. This stops the FM
detector VCO circuit.
3
SIF OUT
Outputs the intercarrier detector output that has been
passed through a high-pass filter.
(4.5MHz output)
4
5
NC
This pin should be left open.
V
Use lines that are as short as possible for V
/ ground
CC
CC
decoupling.
Continued on next page.
No.A0325-11/16
LA75600VA
Continued from preceding page.
Pin No.
Pin name
Function
Equivalent circuit
6
7
8
VIDEO OUT
EQ FILTER
EQ INPUT
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 1.5Vp-p video signal as its input and amplifies
that to a 2.0Vp-p level.
• Notes on the equalizer amplifier design.
The equalizer amplifier is designed as a voltage
follower amplifier with a gain of about 2.3dB.
If frequency characteristics correction is required,
insert the capacitor, inductor, and resistor between
pin 7 and ground in series.
• Using the equalizer amplifier.
If the input signal is Vi and the output signal Vo, then
G: Gain of the voltage follower amplifier
Vin: Imaginary voltage
G: About 2.3 dB
Assuming Vin ≈ 0, then AV will be:
R1 is an IC internal 1kΩ 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.
9
APC FILTER
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.
We recommend the following values for this APC filter:
R = 150 to 390Ω
C = 0.47µF
Continued on next page.
No.A0325-12/16
LA75600VA
Continued from preceding page.
Pin No.
10
Pin name
Function
Equivalent circuit
VIDEO DET OUT 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 ≥ 470Ω
11
12
VCO COIL
VCO COIL
VCO tank circuit for video detection.
This VCO is a vector synthesis VCO circuit.
13
AFT OUT
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.
14
RF AGC OUT
RF AGC output.
This output controls the tuner RF AGC.
The internal circuit includes both a 30kΩ pull-up resistor
and a 100Ω protective resistor.
Determine the value of the external bleeder resistor to
match the specifications of the tuner.
Continued on next page.
No.A0325-13/16
LA75600VA
Continued from preceding page.
Pin No.
Pin name
2nd AGC FILTER IF AGC filter connection.
2nd AGC FILTER The AGC voltage is created by smoothing the signal that
Function
Equivalent circuit
15
16
17
1st AGC FILTER
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.
18
19
VIF INPUT
VIF INPUT
VIF amplifier input.
The input circuit is a balanced input, and its input
impedance is due to the following component values.
R ≈ 1.5kΩ
C ≈ 3pF
20
21
GND
RF AGC VR
RF AGC adjustment.
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.
Continued on next page.
No.A0325-14/16
LA75600VA
Continued from preceding page.
Pin No.
22
Pin name
BPF OUT
Function
Equivalent circuit
Band-pass filter output.
The output to the external band-pass filter is passed
through an internal amplifier before being output.
23
FM FILTER
Filter that holds the FM detector output DC voltage fixed.
Normally, a 1µF electrolytic capacitor is used.
If the low band (around 50Hz) 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.
24
FM DET OUT
Audio FM detector output.
This is an emitter-follower circuit with a 300 Ω 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 ≥ 5.1kΩ
• Mono applications.
Construct an external de-emphasis circuit.
t = C×R2
No.A0325-15/16
LA75600VA
Specifications of any and all SANYO Semiconductor 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.
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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 Semiconductor 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 Semiconductor believes information herein is accurate and
reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual
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This catalog provides information as of June, 2006. Specifications and information herein are subject
to change without notice.
PS No.A0325-16/16
相关型号：
LA75675M-S
VIF/SIF IF Signal-Processing Circuit that Supports NTSC Intercarrier for TV and VCR Products
SANYO
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