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ICs for TV
AN5637
SECAM decoder IC
s Overview
The AN5637 is a chroma signal processing circuit for use in SECAM system. It outputs the color difference signal.
19.20.3 16 9 6.20.3
Unit : mm
s Features
* Built-in bell filter, deemphasis circuit * One point adjustment * Small number of external components
1 8 3.550.05
* SECAM system TV
(0.71) Seating plane 2.54 0.50.1 1.220.25
1.100.25 3.050.25
s Applications
5.200.25
7.620.25 5 3 to 1 +0.10 0.30 - 0.05
DIP016-P-0300D
1
2
Bell Ref. Killer Mon. Bell Mon. 11 2 7
B
AN5637
s Block Diagram
Limiter Amp.
V V Inversion
C-In Limiter Amp.
B
16 Bell Filter IH FF
ACC Amp.
H.VBLK generation
15 SCP In
B
V
ID discrimination
ACC Det.
(VBLK,BGP,Signal)
Amp. V/I conversion
Current shift
B
Reset pulse generation
B
BGP generation
V
Internal discrimination SECAM/Non-SECAM
VBLK generation
ID/fref
1 Limiter Amp. V/I conversion Phase Det. Loop Filter
External discrimination
SECAM/Non-SECAM
ICO
14
N.C.
Output Filter
R-Y Amp. De-Emp.
V
Band Gap
13
N.C. 12
Output Filter
B-Y Amp.
N.C.
10
9
4
6
3
5
8 PLL Ref.
VCC
GND
ICs for TV
-(R-Y) Out
-(B-Y) Out
ICs for TV
s Pin Descriptions
Pin No. 1 Description Reference frequency signal/ Ident input pin 2 3 4 5 Bell filter output monitor pin Power supply pin Black level adjustment voltage input pin Black level adjustment reference voltage output pin 6 7 Grounding pin Bell filter automatic adjustment sample hold pin 9 10 11 12 13 14 15 16 Pin No. 8 Description
AN5637
PLL filter automatic adjustment sample hold pin - (R-Y) output pin - (B-Y) output pin Killer voltage monitor pin N.C. N.C. N.C. Sand castle pulse input pin SECAM signal input pin
s Absolute Maximum Ratings
Parameter Supply voltage Supply current Power dissipation
*2 *1
Symbol VCC ICC PD Topr Tstg
Rating 11.0 73 777 -20 to +70 -55 to +150
Unit V mA mW C C
Operating ambient temperature Storage temperature
*1
Note) *1 : Ta = 25 C except operating ambient temperature and storage temperature. *2 : Power dissipation of the package at Ta = 70 C.
s Recommended Operating Range
Parameter Supply voltage Symbol VCC Range 7.2 to 9.9 Unit V
s Electrical Characteristics at VCC = 9 V, Ta = 25 C
Parameter Power supply Supply current Pin voltage I3 V5 Current when VCC = 9 V Voltage when VCC = 9 V 30 2.9 40 3.2 50 3.5 mA V Symbol Conditions Min Typ Max Unit
3
AN5637
s Electrical Characteristics at VCC = 9 V, Ta = 25 C (continued)
Parameter Input(Pin16) Input dynamic range Chroma signal input amplitude *1 Input impedance Bell filter Symbol Conditions Min Typ
ICs for TV
Max
Unit
Typical input : (Pin16) Color bar signal, (Pin15) Sand castle pulse, (Pin1) 4.43362 MHz sine wave 350 mV[p-p], V-BLK period VDR16 Vch.16 Z16 Composite signal input amplitude range Chroma signal input amplitude range DC measurement 17 1.0 25 1.5 300 33 V mV[p-p] k
Typical input : (Pin16) 4.0 MHz to 4.6 MHz sine wave 10 mV[p-p], (Pin15) Sand castle pulse, (Pin1) 4.43362 MHz sine wave 350 mV[p-p], V-BLK period VADB fOB B Sample hold pin voltage at bell filter automatic adjustement Center frequency of bell filter (Signal period) Band width of bell filter (Signal period) 2.8 3.9 5 V MHz kHz
Bell adjusting voltage Center frequency Band width ACC
4.202 4.262 4.322 250 310 370
Typical input : (Pin16) Color bar signal (Composite) 1 V[p-p], (Pin15) Sand castle pulse, (Pin1) 4.43362 MHz sine wave 350 mV[p-p], V-BLK period ACC1 Output change amount when discrimination signal changes from 150 mV[p-p] to 300 mV[p-p] Output change amount when discrimination signal changes from 150 mV[p-p] to 15 mV[p-p] -6 0 6 %
ACC characteristics 1
ACC characteristics 2
ACC2
-6
0
6
%
Demodulator/Output
Typical input : (Pin16) Color bar signal (Composite) 1 V[p-p], (Pin15) Sand castle pulse, (Pin1) 4.43362 MHz sine wave 350 mV[p-p], V-BLK period VADV VRY VBY LO Sample hold pin voltage at PLL automatic adjustement Color bar (Composite) signal input (1 V[p-p]) Color bar (Composite) signal input (1 V[p-p]) Color bar (Composite) signal input (1 V[p-p]) 3.1 0.85 1.07 -6 1.12 1.45 3.7 1.00 1.27 0 1.27 2.1 4.3 1.15 1.47 6 1.42 2.75 10 V V[p-p] V[p-p] % Times V kHz
PLL adjusting voltage R-Y output amplitude B-Y output amplitude Detector output linearity R-Y/B-Y output ratio Black level adjusting voltage Black level error (R-Y) *2
*2
(R-Y)(B-Y) Amplitude ratio of VRY and VBY VAD4 fBER Pin4 voltage when difference of B-Y black level becomes 0 Value referred to input frequency
Note) *1 : Refer to "Explanations of testing method 1" *2 : Refer to "Explanations of testing method 2"
4
ICs for TV
s Electrical Characteristics at VCC = 9 V, Ta = 25 C (continued)
Parameter Demodulator/Output (continued) Symbol Conditions Min Typ
AN5637
Max
Unit
Typical input : (Pin16) Color bar signal (Composite) 1 V[p-p], (Pin15) Sand castle pulse, (Pin1) 4.43362 MHz sine wave 350 mV[p-p], V-BLK period VBLK S/N Stable sine wave is necessary in V period (4.4336 MHz) Amplitude ratio when Deviation = 460 kHz/0 kHz (Pin10 measurement) Harmonic content with 100 % white signal input (Pin10 measurement) DC measurement, Pin1 = 5 V DC measurement, Pin1 = 1.5 V DC measurement, Pin1 = 5 V DC measurement, Pin1 = 1.5 V 2.2 30 2.7 3.2 V dB
Blanking period output DC voltage SN ratio *3
Residual high frequency amplitude
VRH
10
mV[p-p]
Output impedance (when SECAM) Pin9 Output impedance (when non SECAM) Pin9 Output impedance (when SECAM) Pin10 Output impedance (when non SECAM) Pin10 Sand castle pulse Horizontal and vertical BLK level Burst gate level *5 Reference signal/interface Reference signal amplitude System SW discrimination level IDENT Color On/Off hysteresis Killer sensitivity
*4
ZOS9 ZON9 ZOS10 ZON10
260 1 260 1
460 460
660 660
M M
Typical input : (Pin1) 4.43362 MHz sine wave 350 mV[p-p], V-BLK period VBL VBG Measurement of slice level of H, V blanking pulse Measurement of slice level of burst gate pulse 0.5 3.4 1 3.9 1.5 4.4 V V
Typical input : (Pin1) 4.43362 MHz sine wave 350 mV[p-p], V-BLK period Vref VSS Amplitude range of sine wave (4.43362 MHz) of Pin1 input Voltage when Pin10 becomes open if Pin1 is 5 V to 1 V variable 0.20 2.5 3.0 0.50 3.5 V[p-p] V
Typical input : (Pin16) Color bar signal (Chroma), (Pin15) Sand castle pulse, (Pin1) 4.43362 MHz sine wave 350 mV[p-p], V-BLK period HC K Difference between color turn On or Off and Off to On level Color turn Off level when discrimination signal changes 150 mV[p-p] to 0 mV[p-p] 0.5 2 6 -32 dB dB
Note) *3 : Refer to "Explanations of testing method 3" *4 : Refer to "Explanations of testing method 4" *5 : Refer to "Explanations of testing method 5"
5
AN5637
s Electrical Characteristics at VCC = 9 V, Ta = 25 C (continued)
* Design reference data
Note) The characteristic values below are theoretical values for designing and not guaranteed.
ICs for TV
Parameter Reference signal/interface Sink current Bell filter Center frequency power supply voltage dependency Center frequency ambient temperature dependency Demodulator/Output Output signal bandwidth Deemphasis pole-frequency Pole zero point frequency ratio R-Y output amplitude power supply voltage dependency R-Y output amplitude ambient temperature dependency B-Y output amplitude power supply voltage dependency B-Y output amplitude ambient temperature dependency Black level error (R-Y) power supply voltage dependency Black level error (R-Y) ambient temperature dependency Black level error (B-Y) power supply voltage dependency Black level error (B-Y) ambient temperature dependency
Symbol
Conditions
Min
Typ
Max
Unit A
ISS
Sink current of Pin1 when SECAM signal input
150
175
220
fOB/ VCC fOB/ T
Amount of center frequency fluctuation when VCC = 7.2 V to 9.9 V Amount of center frequency fluctuation when Ta = 30 C to 80 C

0.23 0.25

kHz/V kHz/C
BS fPD fPD/fOD VRY/ VCC VRY/ T VBY/ VCC VBY/ T fBER/ VCC fBER/ T fBEB/ VCC fBEB/ T
Bandwidth of demodulator output signal (Pin9, 10) Automatic adjustment period Automatic adjustment period Fluctuation amount of R-Y output amplitude when VCC = 7.2 V to 9.9 V Fluctuation amount of R-Y output amplitude when Ta = -30 C to +80 C Fluctuation amount of B-Y output amplitude when VCC = 7.2 V to 9.9 V Fluctuation amount of B-Y output amplitude when Ta = -30 C to +80 C Fluctuation amount of black level error (R-Y) when VCC = 7.2 V to 9.9 V Fluctuation amount of black level error (R-Y) when Ta = -30 C to +80 C Fluctuation amount of black level error (B-Y) when VCC = 7.2 V to 9.9 V Fluctuation amount of black level error (B-Y) when Ta = -30 C to +80 C

1.3 85 3 1.5 0.36 2.0 0.55 1

MHz kHz Times % mV[p-p] /C % mV[p-p] /C kHz/V
50
Hz/C
2
kHz/V
90
Hz/C
6
ICs for TV
s Electrical Characteristics at VCC = 9 V, Ta = 25 C (continued)
* Explanations of testing method 1. Measurement of B-Y discrimination signal amplitude 2.
AN5637
Pin15
Pin9
VR
Pin10
VB
Input 100 % white signal and adjust the voltage of Pin4 so that VB becomes 0 mV. Let the adjusted voltage be VAD4. And let the value of VR based on input frequency at that time be fBER , black level error (R-Y). 3. Calculate by using the value of Pin10 (B-Y) output amplitude VBY when the color bar signal (Deviation = 460 kHz) is input to Pin16 and the value of Pin10 output VNOISE when the color bar signal (Deviation = 0 Hz) is input. S/N = 20 log10VBY/VNOISE 4. The horizontal and vertical blanking level VBL is determined by the internal stabilizing power supply circuit. 5. The burst gate level VBG is determined by dividing the IC built-in resistor between VCC-GND. VBG = VCC x 3.8/9 (typ.)
7
AN5637
s Terminal Equivalent Circuits
Pin No. 1 Equivalent circuit
VCC 150A 100A 200A
ICs for TV
Description Reference frequency signal/ Ident input Pin : * Input and output pin for interfacing with AN5192/95. * The circuit becomes non-SECAM mode if DC voltage of Pin1 becomes 3 V or less. * Current of 175 A sinks into Pin1 in SECAM.
Voltage AC + DC DC 1.1 V or 4.4 V AC 350 mV[p-p] or 0
To AN5192/95 200 1 SECAM /Non-SECAM discrimination
Mode changeover
3.7V
1.5k 1.5k 0/175A 0/175A
20k
2
VCC
Bell filter output monitor pin
AC + DC DC 4.3 V AC 200 mV[p-p]
2 200
200A 200A
3 4
VCC
Power supply pin
DC : 9 V
5 6.8k 10k
4
Black level adjustment
0.01F 15k
Black level adjustment voltage input pin : DC * Monitoring -(B-Y) Out (Pin10), 1.45 V to 2.75 V adjust Pin4 voltage so that pedestal step difference becomes 0. (using external volume) * Pin4 voltage is generated by resistor dividing Pin5 voltage so as not to be affected by VCC and temperature fluctuation.
100A 200A
5
VCC
Black level adjustment reference voltage output pin
DC : 3.2V
3.2V
5
100A 100A 400A
8
ICs for TV
s Terminal Equivalent Circuits (continued)
Pin No. 6 7
VCC 300
AN5637
Equivalent circuit
Description Grounding pin Bell filter automatic adjustment sample hold pin
Voltage DC : 0 V DC 2.5 V to 5.0 V
200
200 37.5k
300
1mA
7
100A
100A
8
VCC 750
PLL automatic adjustment sample hold pin
DC 3.6 V to 3.9 V
200
200 1.5k 1.5k
750A 8
100A
9 10
VCC
Pin9 ; -(R-Y) output pin Pin10 ; -(B-Y) output pin
AC + DC AC -(R-Y)
10 9 200
-(B-Y)
100A 200A
DC : 2.9 V
9
AN5637
s Terminal Equivalent Circuits (continued)
Pin No. 11
VCC 100A
ICs for TV
Equivalent circuit
Description Killer voltage monitor pin When SECAM more than 4 V When non-SECAM 3 V
Voltage DC 1.5 V to 5 V
500
200 Killer circuit 11
20k
150A
12 13 14 15
VCC

N.C. N.C. N.C. Sand castle pulse input pin
AC
4.7V 2.4V 0V
200 15
50A 50A
16
VCC 50k 10pF 5k 200 16 50k 40k 2.8V 40k
SECAM signal input pin
AC 1.0 V[p-p]
100A
200A 200A
10
ICs for TV
s Application Circuit Example
Signal In 16 NP 2.2F CVBS Sand Castle Pulse In
AN5637
75
13 N.C.
12 N.C.
N.C.
15
14
11
VC
10
-(B-Y)Out
1
2
3
4
5
6
7
0.01F Reg.Adj.
15k 10k 6.8k
fREF/ID
Bell
0.01F
10F
8
Open Open
9 PLL Ref.
220nF 1F
VCC 9V
Reg.1B
Note) The following signal is inputted to Pin1 from the AN5192/95.
* System discrimination 1. Pin1 is the input and output pin for the three pieces of information (1) Reference frequency signal input pin (AC) (2) System discrimination signal input pin (DC voltage) (3) SECAM/Non-SECAM discrimination output pin (DC current) AN5637 System discrimination SECAM Pin1 input DC voltage "H" (4.6 V) "L" (1.3 V) "H" (4.6 V) Non-SECAM "L" (1.5 V) Pin1 sink current 175 A 175 A 0 A 0 A Pin9, 10 output Color difference signal output
DC voltage output
2. Reference frequency signal The reference frequency signal input for Pin1 is used for the following 4 signals ; (1) Bell filter automatic adjustement (2) PLL(VCO) automatic adjustement (3) Deemphasis automatic adjustement (4) Ident discrimination Be sure to input the high precision PAL carrier signal (4.43362 MHz) only in the vertical retrace period.
Bell Ref.
GND
-(R-Y)Out
SECAM
SCP
11

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