Datasheet AN5637 Datasheet (Panasonic)

ICs for TV

AN5637

SECAM decoder IC

■ Overview

The AN5637 is a chroma signal processing circuit
for use in SECAM system. It outputs the color dif­ference signal.

■ Features

• Built-in bell filter, deemphasis circuit

• One point adjustment

• Small number of external components

■ Applications

• SECAM system TV

16 9

18

(0.71)

Seating plane

19.2±0.3

2.54

0.5±0.1

1.22±0.25

6.2±0.3

3.55±0.051.10±0.25

5.20±0.25

7.62±0.25

3° to 15

3.05±0.25

DIP016-P-0300D

Unit : mm

°

0.30

0

.1

0

+

5

.0

0

–

1

AN5637 ICs for TV

■ Block Diagram

Killer Mon.

Bell Ref.

Bell Mon.

11

7

2

Inversion

B

V

Limiter Amp.

SCP In

15

H.VBLK

generation

IH FF

B

Limiter Amp.

BGP

generation

B

generation

Reset pulse

ID discrimination

V/I conversion

B

V

VBLK

generation

V

Internal

discrimination

SECAM/Non-SECAM

V/I conversion

14

ICO

N.C.

V

N.C.

13

Band Gap

De-Emp.

12

N.C.

3

6

8
5

4

V

CC

GND

PLL Ref.

Bell Filter

Current shift

(VBLK,BGP,Signal)

B−Y Amp.

V

Limiter Amp. Phase Det. Loop Filter

Output Filter

10

9

−(B−Y) Out

−(R−Y) Out

ACC Amp.

16

C-In

B

ACC Det. Amp.

External

discrimination

SECAM/Non-SECAM

1

ref

ID/f

Output Filter R−Y Amp.

2

ICs for TV AN5637

■ Pin Descriptions

Pin No. Description

Pin No. Description

1 Reference frequency signal/

Ident input pin

2 Bell filter output monitor pin
3 Power supply pin
4 Black level adjustment voltage input pin
5 Black level adjustment reference voltage

output pin
6 Grounding pin
7 Bell filter automatic adjustment sample

hold pin

8 PLL filter automatic adjustment sample

hold pin

9 − (R−Y) output pin

10 − (B−Y) output pin
11 Killer voltage monitor pin
12 N.C.
13 N.C.
14 N.C.
15 Sand castle pulse input pin
16 SECAM signal input pin

■ Absolute Maximum Ratings

Parameter Symbol Rating Unit

Supply voltage V
Supply current I

2

Power dissipation
Operating ambient temperature
Storage temperature

Note) *1:Ta = 25 °C except operating ambient temperature and storage temperature.

*2: Power dissipation of the package at Ta = 70 °C.

*

1

*

1

*

CC

CC

P

D

T

opr

T

stg

11.0 V
73 mA

777 mW

−20 to +70 °C

−55 to +150 °C

■ Recommended Operating Range

Parameter Symbol Range Unit

Supply voltage V

CC

■ Electrical Characteristics at VCC = 9 V, Ta = 25 °C

Parameter Symbol Conditions Min Typ Max Unit

Power supply
Supply current I
Pin voltage V

Current when VCC = 9 V 304050mA

3

Voltage when VCC = 9 V 2.9 3.2 3.5 V

5

7.2 to 9.9 V

3

AN5637 ICs for TV

■ Electrical Characteristics at VCC = 9 V, Ta = 25 °C (continued)

Parameter Symbol Conditions Min Typ Max Unit

Input(Pin16) Typical input : (Pin16) Color bar signal, (Pin15) Sand castle pulse,

(Pin1) 4.43362 MHz sine wave 350 mV[p-p], V-BLK period

Input dynamic range V

1

Chroma signal input amplitude

*

V
Input impedance Z
Bell filter Typical input : (Pin16) 4.0 MHz to 4.6 MHz sine wave 10 mV[p-p],

Bell adjusting voltage V

Center frequency f

Band width B Band width of bell filter 250 3 10 370 kHz

ACC Typical input : (Pin16) Color bar signal (Composite) 1 V[p-p],

ACC characteristics 1 ACC1 Output change amount when −606%

ACC characteristics 2 ACC2 Output change amount when −606%

Demodulator/Output Typical input : (Pin16) Color bar signal (Composite) 1 V[p-p],

PLL adjusting voltage V

R−Y output amplitude V

B−Y output amplitude V

Detector output linearity L

R−Y/B−Y output ratio

2

Black level adjusting voltage

Black level error (R−Y)

Note) *1: Refer to "Explanations of testing method 1"

*2: Refer to "Explanations of testing method 2"

*

2

*

(R−Y)(B−Y)

V

f

Composite signal input amplitude  1.0 1.5 V

DR16

range
Chroma signal input amplitude range

ch.16

DC measurement 17 25 33 kΩ

16

300

(Pin15) Sand castle pulse,
(Pin1) 4.43362 MHz sine wave 350 mV[p-p], V-BLK period

Sample hold pin voltage at bell 2.8 3.9 5 V

ADB

filter automatic adjustement
Center frequency of bell filter 4.202 4.262 4.322 MHz

OB

(Signal period)

(Signal period)

(Pin15) Sand castle pulse,
(Pin1) 4.43362 MHz sine wave 350 mV[p-p], V-BLK period

discrimination signal changes from
150 mV[p-p] to 300 mV[p-p]

discrimination signal changes from
150 mV[p-p] to 15 mV[p-p]

(Pin15) Sand castle pulse,
(Pin1) 4.43362 MHz sine wave 350 mV[p-p], V-BLK period

Sample hold pin voltage at PLL 3.1 3.7 4.3 V

ADV

automatic adjustement
Color bar (Composite) signal input 0.85 1.00 1.15 V[p-p]

RY

(1 V[p-p])
Color bar (Composite) signal input 1.07 1.27 1.47 V[p-p]

BY

(1 V[p-p])
Color bar (Composite) signal input −606%

O

(1 V[p-p])
Amplitude ratio of VRY and V
Pin4 voltage when difference of 1.45 2.1 2.75 V

AD4

1.12 1.27 1.42 Times

BY

B−Y black level becomes 0
Value referred to input frequency 10 kHz

BER

mV[p-p]

4

ICs for TV AN5637

■ Electrical Characteristics at VCC = 9 V, Ta = 25 °C (continued)

Parameter Symbol Conditions Min Typ Max Unit

Demodulator/Output (continued) 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

Blanking period V
output DC voltage in V period (4.4336 MHz)

SN ratio

*

S/N Amplitude ratio when 30 dB

3

Residual high frequency amplitude V

Output impedance Z
(when SECAM) Pin9

Output impedance Z
(when non SECAM) Pin9

Output impedance Z
(when SECAM) Pin10

Output impedance Z
(when non SECAM) Pin10

Sand castle pulse Typical input : (Pin1) 4.43362 MHz sine wave 350 mV[p-p], V-BLK period

4

*

Horizontal and vertical BLK level

5

Burst gate level

*

V

V

Reference signal/interface Typical input : (Pin1) 4.43362 MHz sine wave 350 mV[p-p], V-BLK period
Reference signal amplitude V

System SW discrimination level V

IDENT Typical input : (Pin16) Color bar signal (Chroma), (Pin15) Sand castle pulse,

Color On/Off hysteresis H

Killer sensitivity K Color turn Off level when disc- −32 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"

Stable sine wave is necessary 2.2 2.7 3.2 V

BLK

Deviation = 460 kHz/0 kHz
(Pin10 measurement)

Harmonic content with 100 % 10

RH

white signal input
(Pin10 measurement)

DC measurement, Pin1 = 5 V 260 460 660 Ω

OS9

DC measurement, Pin1 = 1.5 V 1 MΩ

ON9

DC measurement, Pin1 = 5 V 260 460 660 Ω

OS10

DC measurement, Pin1 = 1.5 V 1 MΩ

ON10

Measurement of slice level of H, 0.5 1 1.5 V

BL

V blanking pulse
Measurement of slice level of 3.4 3.9 4.4 V

BG

burst gate pulse

Amplitude range of sine wave 0.20  0.50 V[p-p]

ref

(4.43362 MHz) of Pin1 input
Voltage when Pin10 becomes 2.5 3.0 3.5 V

SS

open if Pin1 is 5 V to 1 V variable

(Pin1) 4.43362 MHz sine wave 350 mV[p-p], V-BLK period

Difference between color turn On 0.5 2 6 dB

C

or Off and Off to On level

rimination signal changes
150 mV[p-p] to 0 mV[p-p]

mV[p-p]

5

AN5637 ICs for TV

■ 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.

Parameter Symbol Conditions Min Typ Max Unit

Reference signal/interface
Sink current I

Bell filter
Center frequency power supply ∆f

voltage dependency ∆V
Center frequency ambient ∆f

temperature dependency ∆T tuation when Ta = 30 °C to 80 °C
Demodulator/Output
Output signal bandwidth B

Deemphasis pole-frequency f
Pole zero point frequency ratio f

PD/fOD

R−Y output amplitude ∆V
power supply voltage dependency ∆V

R−Y output amplitude ∆VRY/ Fluctuation amount of R−Y output  0.36 
ambient temperature dependency ∆T

B−Y output amplitude ∆V
power supply voltage dependency ∆V

B−Y output amplitude ∆VBY/ Fluctuation amount of B−Y output  0.55 
ambient temperature dependency ∆T

Black level error (R−Y) ∆f
power supply voltage dependency ∆V

Black level error (R−Y) ∆f
ambient temperature dependency ∆T error (R−Y) when T

Black level error (B−Y) ∆f
power supply voltage dependency ∆V

Black level error (B−Y) ∆f
ambient temperature dependency ∆T error (B−Y) when T

Sink current of Pin1 when SECAM 150 175 220 µA

SS

signal input

/ Amount of center frequency fluc-  0.23  kHz/V

OB

tuation when VCC = 7.2 V to 9.9 V

CC

/ Amount of center frequency fluc-  0.25  kHz/°C

OB

Bandwidth of demodulator output  1.3  MHz

S

signal (Pin9, 10)
Automatic adjustment period  85  kHz

PD

Automatic adjustment period  3  Times

/ Fluctuation amount of R−Y output  1.5  %

RY

amplitude when VCC = 7.2 V to 9.9 V

CC

amplitude when Ta = −30 °C to +80 °C

/ Fluctuation amount of B−Y output  2.0  %

BY

amplitude when VCC = 7.2 V to 9.9 V

CC

amplitude when Ta = −30 °C to +80 °C

/ Fluctuation amount of black level  1  kHz/V

BER

error (R−Y) when VCC = 7.2 V to

CC

9.9 V

/ Fluctuation amount of black level  50  Hz/°C

BER

= −30 °C to

a

+80 °C

/ Fluctuation amount of black level  2  kHz/V

BEB

error (B−Y) when VCC = 7.2 V to

CC

9.9 V

/ Fluctuation amount of black level  90  Hz/°C

BEB

= −30 °C to

a

+80 °C

mV[p-p]

/°C

mV[p-p]

/°C

6

ICs for TV AN5637

■ Electrical Characteristics at VCC = 9 V, Ta = 25 °C (continued)

• Explanations of testing method

1. Measurement of B−Y discrimination signal amplitude

2.

Pin15

Pin9

Pin10

∆V

R

∆V

B

Input 100 % white signal and adjust the voltage of Pin4 so that ∆V

V

.

AD4

And let the value of ∆V

based on input frequency at that time be f

R

3. Calculate by using the value of Pin10 (B−Y) output amplitude V

kHz) is input to Pin16 and the value of Pin10 output V

S/N = 20 log

10VBY/VNOISE

4. The horizontal and vertical blanking level V

5. The burst gate level V
V

= VCC × 3.8/9 (typ.)

BG

is determined by dividing the IC built-in resistor between VCC-GND.

BG



BL

is determined by the internal stabilizing power supply circuit.

when the color bar signal (Deviation = 0 Hz) is input.

NOISE

becomes 0 mV. Let the adjusted voltage be

B

, black level error (R−Y).

BER

when the color bar signal (Deviation = 460

BY

7

AN5637 ICs for TV

■ Terminal Equivalent Circuits

Pin No. Equivalent circuit Description Voltage

1 Reference frequency signal/ AC + DC

To AN5192/95

SECAM

/Non-SECAM
discrimination

V

CC

200Ω

1

1.5kΩ 1.5kΩ

0/175µA 0/175µA

150µA

100µA 200µA

Mode
changeover

20kΩ

3.7V

Ident input Pin :

• Input and output pin for interfacing DC
with AN5192/95. 1.1 V or 4.4 V

•

The circuit becomes non-SECAM mode
if DC voltage of Pin1 becomes 3 V AC
or less. 350 mV[p-p]

• Current of 175 µA sinks into Pin1 or 0
in SECAM.

2 Bell filter output monitor pin AC + DC

V

CC

DC

4.3 V

200Ω

2

AC

200 mV[p-p]

200µA 200µA

3  Power supply pin DC : 9 V
4 Black level adjustment voltage input pin : DC

V

CC

• 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)

5

6.8kΩ
10kΩ

15kΩ

5 Black level adjustment reference voltage DC : 3.2V

4

Black level

0.01µF

V

CC

adjustment

200µA100µA

• Pin4 voltage is generated by resistor
dividing Pin5 voltage so as not to be
affected by V

and temperature

CC

fluctuation.

output pin

3.2V

100µA 100µA 400µA

5

8

ICs for TV AN5637

■ Terminal Equivalent Circuits (continued)

Pin No. Equivalent circuit Description Voltage

6  Grounding pin DC : 0 V
7 Bell filter automatic adjustment sample DC

V

CC

300Ω

200Ω 200Ω

300Ω

hold pin 2.5 V to 5.0 V

37.5kΩ

1mA

7

8 PLL automatic adjustment sample hold DC

V

CC

750Ω

200Ω 200Ω

8

100µA 100µA

pin 3.6 V to 3.9 V

1.5kΩ 1.5kΩ

100µA750µA

9Pin9; −(R−Y) output pin AC + DC

10 Pin10; −(B−Y) output pin

V

CC

AC

−(R−Y)

10

9

200Ω

−(B−Y)

100µA 200µA

DC : 2.9 V

9

AN5637 ICs for TV

■ Terminal Equivalent Circuits (continued)

Pin No. Equivalent circuit Description Voltage

11 Killer voltage monitor pin DC

12  N.C. 
13  N.C. 
14  N.C. 
15 Sand castle pulse input pin AC

V

20kΩ

CC

150µA

500Ω

100µA

1.5 V to 5 V
When SECAM more than 4 V
When non-SECAM 3 V

200Ω

Killer
circuit

11

V

CC

4.7V

2.4V
0V

200Ω

15

50µA50µA

16 SECAM signal input pin AC

V

CC

50kΩ

10pF

5kΩ

200Ω

16

50kΩ

40kΩ

2.8V

200µA 200µA100µA

40kΩ

1.0 V[p-p]

10

ICs for TV AN5637

■ Application Circuit Example

CVBS

SECAM

Signal In

NP 2.2µF

16

SCP

75Ω

Sand Castle Pulse In

15

14

N.C.

N.C.

13

N.C.

12

11

VC

−(B−Y)Out

10

−(R−Y)Out

9

1

/ID

REF

f

Note) The following signal is inputted to Pin1 from the AN5192/95.

2

Bell

3

9V

CC

V

4

10µF

Reg.Adj.

0.01µF

0.01µF

5

Reg.1B

• 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 Pin1 input

System discrimination DC voltage

Pin1 sink current Pin9, 10 output

"H" (4.6 V) 175 µA

SECAM

"L" (1.3 V) 175 µA Open

"H" (4.6 V) 0 µA DC voltage output

Non-SECAM

"L" (1.5 V) 0 µA Open

6

6.8kΩ

10kΩ15kΩ

7

1µF

8

220nF

GND

Bell Ref.

PLL Ref.

Color difference signal 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.

11