Ordering number : EN*A1004
Monolithic Linear IC
LA75521VA
IF Signal Processing (VIF+SIF) IC
that Supports the PAL Video
Standard for TV Sets and VCRs
Overview
The LA75521VA is a fully adjustment-free VIF + SIF signal processing IC for TV sets and VCRs that supports the PAL
video standard. It supports 38.0MHz, 38.9MHz, and 39.5MHz as the IF frequencies, as well as PAL sound multi-system
(M/N, B/G, I and D/K), and contains an on-chip sound carrier trap. The IC employs a 4MHz frequency (which can be
switched to 4.43MHz) as the reference frequency of the adjustment free circuit, and controls the VCO, AFT, and sound
filter using an external input signal.
Features
•
•
•
•
•
Internal VCO adjustment free circuit eliminating the need for an external VCO coil.
Internal sound carrier trap enables easy configuration of PAL sound multi-system at low cost.
Considerably reduces the number of required peripheral parts.
Use of digital AFT eliminates a problem of AFT tolerance.
Package: SSOP24(225mil)
Functions
• VIF amplifier
• Adjustment-free VCO and PLL detector circuit
• Digital AFT circuit
• RF AGC
• Buzz canceller
• EQAMP
• Internal sound carrier trap
• First SIF detector circuit
• PLL-FM detector circuit
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to
"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,
communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be
intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace
instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety
equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case
of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee
thereof. If you should intend to use our products for applications outside the standard applications of our
customer who is considering such use and/or outside the scope of our intended standard applications, please
consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our
customer shall be solely responsible for the use.
Specifications of any and all SANYO Semiconductor Co.,Ltd. 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.
21308 TI IM No.A1004-1/13
LA75521VA
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
VCC
6
Allowable power dissipation
Pd max
Operating temperature
Topr
-20 to +70
°C
Storage temperature
Tstg
-55 to +150
°C
Ta ≤ 70°C, Mounted on a specified board.*
640
V
mW
*: Mounted on a specified board: 76.1mm×114.3mm×1.6mm, glass epoxy board
Operating Conditions at Ta = 25°C
Parameter
Symbol
Recommended supply voltage
VCC
Operating supply voltage
VCC op
Conditions
Ratings
Unit
5.0
V
4.5 to 5.5
V
Electrical Characteristics at Ta = 25°C, VCC = 5.0V, fp = 38.9MHz
Parameter
Symbol
Conditions
No.
Ratings
min
typ
Unit
max
VIF block
Circuit current
I4
V1
75
85
95
mA
Max RF AGC voltage
V14H
V2
4.0
4.5
5.0
V
Min RF AGC voltage
V14L
V3
0.0
0.5
1.0
V
38
dBμV
Input sensitivity
Vi
V4
26
32
AGC range
GR
V5
58
63
dB
Vi max
V6
95
100
dBμV
Max allowable input
Quiescent video output voltage
Sync signal edge voltage
Video output level
Video out 2
V5
V7
2.2
2.5
2.8
V5 tip
V8
0.8
1.0
1.2
V
V
VO
V9
1.0
1.2
1.4
Vp-p
Black noise threshold voltage
VBTH
V10
0.5
0.8
1.1
V
Black noise clamp voltage
VBCL
V11
1.2
1.5
1.8
V
Video S/N
S/N
B/G
V12
46
50
C-S best
IC-S
P/S = 10dB
V13
38
43
Differential gain
DG
VIN = 80dBμ
V14
3
6.5
Differential phase
DP
V15
3
5
Quiescent AFT voltage
V12
2.5
3.0
15pin to VCC
V16
2.0
dB
dB
%
deg
V
Max AFT voltage
V12H
LOAD 22kΩ/22kΩ
V17
4
4.5
5
V
Min AFT voltage
V12L
LOAD 22kΩ/22kΩ
V18
0
0.5
1
V
AFT sensitivity
SF
LOAD 22kΩ/22kΩ
V19
8.5
12.5
16.5
APC pull-in range (U)
Fpu
V20
2.0
APC pull-in range (L)
Fpl
V21
β
V22
VCO control sensitivity
3
2.4
mV/kHz
MHz
-2.4
-2.0
MHz
6
12
kHz/mV
kΩ
VIF input resistance
Ri
38.9MHz
V23
1.0
1.5
VIF input capacity
Ci
38.9MHz
V24
3
6
N trap1 (4.5M)
NT1
wrt 1MHz
V25
N trap2 (4.8M)
NT2
wrt 1MHz
V26
-19
-24
dB
BG trap1 (5.5M)
BT1
wrt 1MHz
V27
-27
-32
dB
BG trap2 (5.85M)
BT2
wrt 1MHz
V28
-20
-25
dB
I trap1 (6.0M)
IT1
wrt 1MHz
V29
-25
-30
dB
I trap2 (6.55M)
IT2
wrt 1MHz
V30
-15
-20
dB
DK trap1 (6.5M)
DT1
wrt 1MHz
V31
-25
-30
NGD1
wrt 1MHz
V32
30
80
145
ns
NGD1-1
wrt 1MHz
V33
110
200
290
ns
BGD2
wrt 1MHz
V34
50
130
210
ns
BGD2-1
wrt 1MHz
V35
120
200
280
ns
Group delay 1 NTSC (3.0M)
Group delay 1-1 NTSC (3.5M)
Group delay 2 BG (4M)
Group delay 2-1 BG (4.4M)
-30
-35
pF
dB
dB
Continued on next page.
No.A1004-2/13
LA75521VA
Continued from preceding page.
Parameter
Group delay 3 I (4M)
Symbol
Conditions
No.
Ratings
min
typ
Unit
max
IGD3
wrt 1MHz
V36
0
80
130
ns
Group delay 3-1 I (4.4M)
IGD3-1
wrt 1MHz
V37
80
120
160
ns
Group delay 4 DK (4M)
DGD4
wrt 1MHz
V38
10
30
50
ns
Group delay 4-1 DK (4.4M)
DGD4-1
wrt 1MHz
V39
30
60
90
ns
Video f characteristics MN1
VFMN1
M/N 1 to 2MHz
V40
-1.0
0.0
1.0
dB
Video f characteristics MN2
VFMN2
M/N 2 to 3MHz
V41
-1.0
0.0
1.0
dB
Video f characteristics MN3
VFMN3
M/N 3.58MHz
V42
-3.0
-1.5
0.0
dB
Video f characteristics BG1
VFBG1
B/G 1 to 3MHz
V43
-1.0
0.0
1.5
dB
Video f characteristics BG2
VFBG2
B/G 3 to 4MHz
V44
-1.5
0.0
1.5
dB
Video f characteristics BG3
VFBG3
B/G 4.43MHz
V45
-2.5
-1.0
0.5
dB
Video f characteristics I1
VFI1
I 1 to 3MHz
V46
-1.0
0.0
1.0
dB
Video f characteristics I2
VFI2
I 3 to 4MHz
V47
-1.0
0.0
1.5
dB
Video f characteristics I3
I 4.43MHz
V48
-1.5
0.0
1.5
dB
Video f characteristics DK1
VFDK1
VFI3
D/K 1 to 3MHz
V49
-1.0
0.0
1.0
dB
Video f characteristics DK2
VFDK2
D/K 3 to 4MHz
V50
-1.0
0.0
1.5
dB
Video f characteristics DK3
VFDK3
D/K 4.43MHz
V51
-1.5
0.0
1.5
dB
Group delay 2-2 BG shift (4M)
BGD2-2
wrt 1MHz
V52
50
100
150
ns
Group delay 2-3 BG shift (4.4M)
BGD2-3
wrt 1MHz
V53
110
180
250
ns
SIF carrier output level 1
So1
Vi = 1mV
F1
21
43
86
mVrms
SIF carrier output level 2
So2
Vi = 10mV
F2
21
43
86
mVrms
F3
110
120
1st SIF Block
1st SIF max input
Si max
dBμV
1st SIF input resistance
Ris
33.4MHz
F4
2
2.4
kΩ
1st SIF input capacity
Cis
33.4MHz
F5
3
6
pF
dBμV
SIF Block
Limiting sensitivity (SPLIT)
Vi (lim) (SP)
P = 80dBμ CW
S1
20
25
30
Limiting sensitivity (INTER)
Vi (lim) (IN)
P = 80dBμ P/S
S2
29
35
41
dB
FM detection output voltage
VO (FM)
f = 5.5MHz, ΔF = ±30kHz
S3
390
560
730
mVrms
50
AM removal ratio
AMR
S4
Distortion factor
THD
S5
FM detection output S/N
PAL/NT audio voltage gain difference
S/N (FM)
P = 80dBμ CW
GD
S6
dB
60
0.3
0.8
%
60
dB
S7
6
dB
55
PAL De-emphasis
Pdeem
S8
-3
dB
NT De-emphasis
Ndeem
S9
-3
dB
SIF system SW threshold voltage A/B
V7_9th
C1
2.2
2.5
2.8
V
38MHz/38.9MHz threshold voltage
V10th1
C2
0.7
1.0
1.3
V
38.9MHz/39.5MHz threshold voltage
V10th2
C3
3.7
4.0
4.3
V
Inter-carrier system
V13th
C4
0.3
V
AFT mute level/SIF trap shift
V15th1
Control Block
threshold voltage 1
AFT mute level/SIF trap shift
V15th2
threshold voltage 2
AFT mute level/SIF trap shift
V15th3
threshold voltage 3
C5
0.7
1.0
1.3
V
C6
2.2
2.5
2.8
V
C7
3.7
4.0
4.3
V
O1
83
90
95
dBμV
O2
150
270
Others
Ref clock input level
Reference frequency SW threshold
resistance
Reflev
R11
4.0MHz
kΩ
No.A1004-3/13
LA75521VA
Package Dimensions
unit : mm (typ)
3287
Pd max - Ta
6.5
1200
24
Allowable Power Dissipation, Pd max - mW
0.5
6.4
4.4
13
12
1
0.5
0.15
0.22
800
600
400
200
0
-20
0
(1.3)
1.5max
(0.5)
1000
Mounted on a specified board:
76.1mm ×114.3mm ×1.6mm, glass epoxy board
20
40
60
80
100
0.1
Ambient T emperature, T a - °C
SANYO : SSOP24(225mil)
System changeover
a. SIF system SW
The SIF system changeover can be made by connecting both/either A (pin 7) and/or B (pin 9) to GND or by keeping
both or either of them OPEN.
A
B
GND
GND
GND
OPEN
OPEN
GND
OPEN
OPEN
BG
I
DK
MN
{
{
{
{
FM DET LEVEL
de-emphasis
0dB
50μs
0dB
50μs
0dB
50μs
6dB
75μs
Note: { indicates that the system is selected.
b. IF system SW
The IF frequency becomes 38.9MHz when pin 10 is open.
The IF frequency changes to 38.0MHz when pin 10 is connected to GND.
This frequency also changes to 39.5MHz when pin 10 is set to VCC.
c. split/inter carrier SW
Inter carrier is selected by connecting the 1st SIF input (pin 13) to GND.
d. Reference frequency changeover SW
The frequency becomes 4.43MHz when pin 11 is open.
The frequency becomes 4.0MHz when 270kΩ is connected between pin 11 and GND.
e. AFT mute level, TRAP point shift
By changing the voltage of pin 15, the potential when AFT is muted and the TRAP point of either “just” or “shift”
(about +220kHz) can be selected.
Pin 15 potential
AFT mute potential
TRAP point shift
VCC to 4V
MIDDLE (VCC/2)
Just
4V to 2.5V
MIDDLE (VCC/2)
Shift
2.5V to 1V
HI (VCC)
Just
1V to GND
HI (VCC)
Shift
* With VCC = 5V
f. When the FM detection function is not used
When the SIF circuit is not used and the FM detection VCO is to be stopped, short-circuit pin 1 - GND with the
resistance of 1kΩ or less.
No.A1004-4/13
LA75521VA
Pin Assignment
DE-EMPHASIS C
1
24 AUDIO OUTPUT
SIF AGC FILTER
2
23 FILTER CONTROL C
FM PLL FILTER
3
22 AUDIO BIAS FILTER
VCC
4
21 SIF CARRIER OUTPUT
VIDEO OUTPUT
5
20 RF AGC VR
EQ FILTER
6
SIF SYSTEM SW A
7
18 VIF IN 1
APC FILTER
8
17 VIF IN 2
SIF SYSTEM SW B
9
16 VIF AGC FILTER
19 GND
LA75521VA
VIF FREQUENCY SW 10
15 AFT MUTE LEVEL
REFERENCE CP INPUT 11
14 RF AGC OUTPUT
13 1st SIF INPUT
AFT OUTPUT 12
Top view
Block Diagram
SOUND CARRIER
OUTPUT
RF AGC
OUTPUT
VIF/SIF
INPUT
SW15
AUDIO
OUTPUT
SAWF(P)
1μF
24
23
0.022μF
SAWF(S)
22
21
20
19
18
RF
AGC
AMP
FM
DET
17
16
VIF
AMP
IF
AGC
SPLIT
AMP
15
14
2
0.01μF
4
0.033μF
3.3kΩ
5
VCO
AFT
SW
7
8
9
0.47μF
51Ω
330pF
VIDEO
OUTPUT
SW11
REFERENCE
OPEN
4.43MHz
SHORT
4.0MHz
SW13
SYSTEM
OPEN
SPLIT
SHORT
INTER
V4
MIDDLE (VCC/2)
0
V3
MIDDLE (VCC/2)
+250kHz
V2
HI (VCC)
0
V1
HI (VCC)
+250kHz
Pin 7 Pin 9 SIF SYSTEM
MODE
CTRL
10
11
SW10
V3
V2
V1
0.01μF
38.0MHz
SW15 AFT MUTE LEVEL B/G TRAP SHIFT
INT
6
38.9MHz
V1
13
VIDEO
DET
EQ
AMP
3
39.5MHz
V2
AGC
APC
AGC
V3
1stSIF
TRAP AMP
TRAP
SIF
AMP
SW10 VIF FREQUENCY
SW13
1μF
DEEMP
1
V4
V3
V2
V1
SYSTEM SW SYSTEM SW
B
A
VIF FREQ.
AFT
OUTPUT
12
HI
HI
HI
LO
M
I
LO
HI
B/G
LO
LO
D/K
SW11
1000pF
VCC
270kΩ
4.43/4MHz
No.A1004-5/13
LA75521VA
AC Characteristics Test Circuit
SOUND CARRIER
OUTPUT
0.01μF
AUDIO
OUTPUT
1μF
1μF
24
23
22
51Ω
30KVR
20
19
RF
AGC
DEEMP
1000pF
0.022μF
18
30kΩ
0.01μF
0.01μF
21
17
16
VIF
AMP
15
14
13
AGC
VIDEO
DET
SPLIT
AMP
INT
FM
DET
RF AGC
OUTPUT
1stSIF
TRAP AMP
IF
AGC
AMP
VCC (5V)
51Ω
0.01μF
0Ω
SIF
INPUT
VIF INPUT IFAGC V15
VCO
AFT
TRAP
SW
APC
SIF
AMP
AGC
3
4
5
6
7
9
10
11
12
AFT OUTPUT
FILTER
1.5kΩ
0.47μF
EQ
FILTER
V7
V9
V10
4MHz
CP INPUT
22kΩ
1000pF
22kΩ
33Ω
330pF
0.033μF
8
270kΩ
0.01μF
100kΩ
0.01μF
2
3.3kΩ
1
MODE
CTRL
EQ
AMP
0.1μF
VCC (5V)
VIDEO
VIDEO
OUTPUT2 OUTPUT1
No.A1004-6/13
LA75521VA
Test Circuit
Input Impedance Test Circuit (VIF and first SIF input impedance)
Impedance analyzer
1st SIF IN
24
23
22
21
20
19
18
17
0.01μF
0.01μF
0.01μF
0.01μF
0.01μF
0.01μF
0.01μF
0.01μF
0.01μF
0.01μF
0.01μF
VIF IN
16
15
14
13
9
10
11
12
100μF
22kΩ
0.01μF
0.01μF
0.01μF
8
0.01μF
7
0.01μF
6
0.01μF
5
0.01μF
4
1kΩ
3
0.01μF
2
0.01μF
0.01μF
1
0.01μF
22kΩ
LA75521VA
VCC
No.A1004-7/13
LA75521VA
Pin Functions
Pin
Pin name
No.
1
DE-EMPHASIS C
Function
Equivalent Circuit
De-emphasis capacitor connection pin
This is used to switch the equivalent resistance
(5kΩ or 7.5kΩ) internally in the IC to select the
4kΩ
time constant.
1
This switching is linked to the SIF input switch.
To disable de-emphasis, disconnect the capacitor.
Connection of an external capacitance of 0.01μF
enables switching between 50 and 75μs.
When the FM detector circuit is not to be used, the
0.01μF
FM VCO can be stopped by connecting it to
ground with a resistor of 1kΩ or less.
2
SIF AGC FILTER
AGC filter pin for SIF carrier
0.01μF is recommended for C1.
2kΩ
2
C1
3
FM PLL FILTER
PLL filter pin of FM detector
This is used to configure an external lag lead filter.
Example: Connect 330pF in parallel with the filter
(0.033μF + 3.3kΩ).
3
0.033μF
8kΩ
330pF
3.3kΩ
3
4
VCC
Power supply
5
EQ OUT
Equalizer circuit. This circuit is used to correct the
6
EQ FILTER
video signal frequency characteristics.
Notes on equalizer amplifier design
• The equalizer amplifier is designed as a voltage
follower amplifier with a gain of about 0 dB. When
used for frequency characteristics correction, a
capacitor, inductor, and resistor must be
2kΩ
R1:1kΩ
5
connected in series between pin 6 and ground.
R1
Equalizer amplifier gain AV = Z + 1
R1 is the IC internal resistance, and is 1kΩ. 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.
6
C
L
=Z
R
Continued on next page.
No.A1004-8/13
LA75521VA
Continued from preceding page.
Pin
No.
Pin name
Function
Equivalent Circuit
7
SIF SYSTEM SW A
SIF system selection switch pins. Combining the
9
SIF SYSTEM SW B
settings of these two pins supports four systems.
In M/N mode, the audio output level is increased
50kΩ
50kΩ
by 6dB.
The internal trap is also linked to these switches.
A
7
1kΩ
1kΩ
9
1kΩ
80kΩ
1kΩ
B
The truth-values are as follows.
8
APC FILTER
Pin 7
Pin 9
MODE
H
H
M
H
L
I
L
H
B/G
L
L
D/K
80kΩ
30kΩ
30kΩ
PLL APC filter connection pin. The APC count is
switched internally in the IC.
The VCO is normally controlled by route A.
When unlocked and during weak field reception,
the VCO is controlled by route B and the loop gain
is increased.
For this APC filter we recommend a resistor of 51Ω
FROM
APC
A DET
1kΩ 1kΩ
and capacitor of 0.47μF.
The buzz characteristics can be improved by
connecting a capacitor of 100pF or so between
B
pins 5 and 8.
8
10
VIF FREQUENCY SW
Switch pin for selecting the IF frequency
When this pin is open, 1/2VCC exists.
50kΩ
VCC: 39.5MHz
Open: 38.9MHz
GND: 38.0MHz
11kΩ
10
50kΩ
11
REFERENCE CP
Reference signal input pin necessary for adjusting
INPUT
the internal sound carrier trap, AFT, etc.
Either 4.0 or 4.43MHz can be selected. Use the
configuration shown in example 1 when using
4.43MHz and configuration shown in example 2
200kΩ
when using 4.0MHz.
Since no oscillator can be configured simply by
connecting the X’tal resonator to pin 11, input the
reference signal from an external source without
fail.
Example 1
Example 2
11
11
1000pF
4.43M
1000pF
11
270kΩ
4.0MHz
Continued on next page.
No.A1004-9/13
LA75521VA
Continued from preceding page.
Pin
No.
12
Pin name
AFT OUTPUT
Function
Equivalent Circuit
AFT output pin. 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.
R
For the resistor we recommend a resistance equal
500Ω
to or greater than 22kΩ.
For the filter C1 we recommend a capacitance of
12
0.1μF.
500Ω
13
1st SIF INPUT
R
C1
First SIF input pin. A DC cut capacitor must be
used in the input circuit.
(a) If a SAW filter is used :
The first SIF sensitivity can be increased by
2kΩ
inserting an inductor between the SAW filter
and the IC to neutralize the SAW filter output
capacitance and the IC input capacitance.
(b) When used in an intercarrier system :
Connect this pin to ground.
13
14
RF AGC OUTPUT
RF AGC output pin. This output controls the tuner
RF AGC.
This is the open collector output and a protective
VCC
200Ω resistor is inserted. Determine the external
bleeder resistor value in accordance with the
specifications of the tuner.
15
AFT MUTE LEVEL
200Ω
14
A switch pin for selecting the mute potential when
muting is applied to the AFT due to PLL unlock,
etc. At the same time, it is used to control the trap
point shift of the audio trap (in the B/G mode).
When the frequency characteristics of the video
66kΩ
band are to be made as flat as possible with the
split input, the trap can be shifted to the high range
although the attenuation of the sound carrier will
drop. Therefore, when used in combination with
15
the SAW filter, verify that the level is high enough
before use.
Voltage
ATF MUTE
Voltage
TRAP SHIFT
VCC to 4V
VCC/2
0
4V to 2.5V
VCC/2
+250kHz
2.5V to 1V
VCC
0
1V to GND
VCC
+250kHz
34kΩ
* When VCC = 5 V
Continued on next page.
No.A1004-10/13
LA75521VA
Continued from preceding page.
Pin
Pin name
No.
16
IF AGC
Function
Equivalent Circuit
IF AGC filter connection pin.
The signal peak-detected by the built-in AGC
5kΩ
detector is converted to the AGC voltage at pin 16.
Additionally, a second AGC filter (a lag-lead filter)
used to create the dual time constants is provided
internally in the IC.
1kΩ
Use a 0.022μF capacitor as the external capacitor
(C1), and adjust the value according to the sag,
AGC speed, and other characteristics.
1kΩ
16
C1
17
VIF IN2
VIF amplifier input pin
18
VIF IN1
The input circuit is a balanced circuit, and the input
impedance is as follows:
R ≈ 1.0kΩ
1kΩ
1kΩ
17
18
19
GND
20
RF AGC VR
RF AGC volume connection pin
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.
1kΩ
1kΩ
20
21
SIF CARRIER
First SIF output pin
OUT
This is an emitter-follower output with a 200Ω
resistor attached in series.
200Ω
21
Continued on next page.
No.A1004-11/13
LA75521VA
Continued from preceding page.
Pin
No.
22
Pin name
Function
AUDIO BIAS
Connection pin for a filter used to hold the FM
FILTER
detector output DC voltage fixed. Normally, a 1μF
Equivalent Circuit
300Ω
300Ω
40kΩ
electrolytic capacitor should be used. The
40kΩ
capacitance (CI) should be increased if the low
band (around 50Hz) frequency characteristics
need to be improved.
22
+
23
FILTER
Internal filter (trap) control pin
CONTROL C
Connect a capacitor with a capacitance between
C1
0.47 to 1μF, depending on the video S/N as well
as the levels of the AM and PM noise.
23
24
AUDIO OUTPUT
Sound output pin
Emitter follower output
24
1kΩ
No.A1004-12/13
LA75521VA
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PS No.A1004-13/13