STV6435S [STMICROELECTRONICS]
Filtered Video Buffers for STB and DVD Devices; 过滤后的视频缓冲器，用于机顶盒和DVD设备
| 型号： | STV6435S |
| 厂家： | 
ST |
| 描述： | Filtered Video Buffers for STB and DVD Devices |
| 文件： | 总17页 (文件大小：339K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
STV6435
Filtered Video Buffers for STB and DVD Devices
TARGET SPECIFICATION
FEATURES
■ Y, C, CVBS and RGB Inputs with 7 MHz Filters
■ 6 dB Gains
■ Capabilities of Integrated Output Buffers:
Single Load (150Ω) for RGB signals
Double Load (75Ω) for Y, C and CVBS signals
■ DC Coupled Outputs for CVBS and RGB
signals, DC or AC coupled output for Chroma
signal
SO24
■ Bottom Clamp on RGB, Y and CVBS, Bias
Order Code: STV6435S
Clamp on C
■ Crosstalk: 55 dB (typ.)
■ Separate Stand-by Modes on Y/C/CVBS and
on RGB signals
■ Switchable Y+C Adder for Decoders without
CVBS Outputs
DESCRIPTION
The STV6435 is a filtered video output interface for
STB and DVD applications.
After removing D/A conversion noises using
integrated low pass filters, the STV6435 adapts in
amplitude and impedance the video signals coming
from the digital decoder for transmission, via 75Ω
adapted cables, to the TV set, VCR and auxiliary
devices.
PDIP20
The STV6435 is powered by a 5V supply.
Order Code: STV6435D
The STV6435 is fully compatible with STi55xx
Digital Decoders.
The STV6435 is mounted in a SO24 package
(STV6435S) or in a DIP package (STV6435D).
September 2003
1/17
This is preliminary information on a new product forseen to be developed. Details are subject to change without notice.
STV6435
Table of Contents
Chapter 1
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
1.1
I/O Pin Description .............................................................................................................4
Chapter 2
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Absolute Maximum Ratings ................................................................................................6
Thermal Data ......................................................................................................................6
Electrical Characteristics ......................................................................................................6
2.1
2.2
2.3
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Input/Output Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Application Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Package Mechanical Data
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
2/17
STV6435
General Information
1
General Information
Figure 1: STV6435S Pinout
1
24
23
22
21
20
19
18
17
16
15
14
13
CVBS_ENC
DEC
VCCB3
CVBSOUT
VCCB2
COUT
GNDB
GND
2
3
C_ENC
GND
4
5
Y_ENC
GND
6
GND
7
GND
VCC
8
YOUT
GOUT
VCCB1
ROUT
BOUT
G_ENC
R_ENC
MUTE
B_ENC
9
10
11
12
Figure 2: STV6435D Pinout
CVBS_ENC
VCCB3
1
20
19
18
DEC
C_ENC
GND
CVBSOUT
VCCB2
2
3
4
17 COUT
Y_ENC
VCC
5
16
15
14
13
12
11
GNDB
YOUT
GOUT
VCCB1
ROUT
BOUT
6
7
G_ENC
R_ENC
MUTE
8
9
10
B_ENC
Note:
The three RGB channels are identical and their pin assignments may be interchanged in an
application if needed. In this case, verify that the outputs correspond to the inputs; for example, the
pin 7 input must correspond to the pin 14 output.
3/17
General Information
STV6435
1.1
I/O Pin Description
Table 1: Pin Description
STV6435S STV6435D
Name
CVBS_ENC
Function
1
2
1
2
3
4
5
CVBS Input from Encoder command internal CVBS switch
Decoupling Capacitor
Chroma Input from Encoder
Ground
DEC
3
C_ENC
GND
4
5
Y_ENC
GND
Y Input from Encoder
Ground
6
7
GND
Ground
8
6
7
VCC
+5 V Supply
9
G_ENC
R_ENC
MUTE
B_ENC
BOUT
ROUT
VCCB1
GOUT
YOUT
GND
Large-band Y Input from Encoder
Large-band R Input from Encoder
4-State command for Mute
Large-band B Input from Encoder
B Output
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
8
9
10
11
12
13
14
15
R Output
+5 V Supply for Output Buffers
G Output
Y Output
Ground
GND
Ground
16
17
18
19
20
GNDB
COUT
VCCB2
CVBSOUT
VCCB3
Ground for Buffers
Chroma Output
+5 V Supply for Output Buffers
CVBS Output
+5 V Supply for Output Buffers
4/17
STV6435
General Information
Figure 3: STV6435 Block Diagram
7 MHz
COUT
C_ENC
Buffer
Buffer
Av. Clamp
Bot. Clamp
6 dB
6 dB
4th order
7 MHz
CVBSOUT
CVBS_ENC
Y_ENC
4th order
7 MHz
YOUT
6 dB
Bot. Clamp
Buffer
4th order
Mute
MUTE
G_OUT
R_OUT
B_OUT
7 MHz
G_ENC
6 dB
Bot. Clamp
Bot. Clamp
Bot. Clamp
Buffer
4th order
7 MHz
R_ENC
B_ENC
6 dB
6 dB
Buffer
Buffer
4th order
7 MHz
4th order
5/17
Electrical Characteristics
STV6435
2
Electrical Characteristics
2.1
Absolute Maximum Ratings
Symbol
Parameter
Value
Unit
V
, V
V
Supply Voltage
6
V
V
CC
CCB
-0.6 to V
Voltage at all pins to Ground
CC
Human Body Model: 100 pF discharged
through 1.5 kΩ serial resistor
V
ESD Susceptibility
±4
kV
ESD
2.2
Thermal Data
Symbol
Parameter
Value
Unit
Junction-to-Ambient Thermal
Resistance
STV6435S
STV6435D
70
65
R
°C/W
thJA
Maximum Recommended
Junction Temperature
STV6435S
STV6435D
T
130
°C
J
T
Operating Ambient Temperature
Storage Temperature
0 to +70
°C
°C
OPER
T
-55 to +150
STG
2.3
Electrical Characteristics
Test conditions: TAMB = 25°C, VCC = 5 V; VCCB = 5 V; RGENERATOR = 75 Ω, RLOUT = 75 Ω for
YOUT, CVBSOUT and COUT RLOUT = 150 Ω for GOUT, BOUT and ROUT, unless otherwise
specified.
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
Operating Supply Voltage
Buffer Supply Voltage
4.75
4.75
5.00
5.00
5.25
5.25
V
V
CC
V
CCB
Active (Channels ON)
No Load, MUTE pin to VCC pin
(5 V) All channels active
I
I
I
Supply Current (V + V
)
)
)
50
30
30
65
mA
mA
mA
CC1
CC2
CC3
CC
CCB
CCB
CCB
No Load, MUTE pin = 1.5 V (not
connected) Y/C/CVBS active
Supply Current (V + V
CC
No Load, MUTE pin = 3 V
RGB active
Supply Current (V + V
CC
Standby (All Channels OFF)
I
Total Supply Current
No Load, MUTE pin to 0 V
4
mA
CCSTB
6/17
STV6435
Electrical Characteristics
2.3.1 Video Section (Y and CVBS Signals)
Test conditions: TAMB = 25°C, VCC = 5 V; VCCB = 5 V; RGENERATOR = 75 Ω, RLOUT = 75 Ω for Y and
CVBS outputs and RLOUT = 150 Ω for G output, unless otherwise specified.
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
DC Input Level, Bottom Clamp input
Bottom level, Y and CVBS inputs
2
V
DCIN
Clamping Current, Bottom Clamp
input
I
at V
- 400 mV
1
2
mA
CLAMP
DCIN
Input Leakage Current, Bottom Clamp
input
I
V
= V
+1 V
1
10
µA
pF
LEAK
IN
DCIN
C
Input Capacitance
2
IN
V
V
= 5 V
= 5 V
V
Maximum Input Signal
Dynamic Output Signal
1.5
3
IN
CCV
PP
V
V
DYN
YF1
CCV
PP
-1 dB Bandwidth (Flatness) of Y and
CVBS
1H signal
4.0
4.5
MHz
YF3
-3 dB Bandwidth of Y and CVBS
Stopband Rejection
1H signal
7
MHz
dB
YSBR
27 MHz versus 100 kHz
- 40
V
= 1 V Band = 15 kHz to
PP,
IN
Flatness
Spread of Gain in Video Bands
±0.5
dB
5 MHz for Y and CVBS
V
= 0.5 V at f = 3.58 MHz, on
IN
PP
Crosstalk Isolation of Y (or CVBS)
from C and RGB channels
either CIN_ENC, RIN_ENC,
BIN_ENC or GIN_ENC inputs,
VCTo
55
dB
R
= 150Ω
LOAD
R
Output Resistance
5
6
10
Ω
OUT
V
= 1 V at f = 1 MHz
GY
Gain on Y and CVBS channels
5.5
6.5
dB
IN
PP
Video signal bottom sync pulse at
IC output pins
DC
DC Output Voltage (Y)
0.5
1.0
V
V
YOUT
Video signal bottom sync pulse at
IC output pin
DC
DC Output Voltage (CVBS)
CVBSOUT
V
V
= 1 V at f = 3.58 MHz
DPHI
DG
Differential Phase
Differential Gain
0.2
0.3
0.5
3
3
3
deg.
%
IN
IN
PP
= 1 V at f = 3.58 MHz
PP
LNL
Luminance non-linearity
%
Video S/N Ratio: Y, C, CVBS and RGB NTC-7 weighting 4.2 MHz
VSN7
Dtpd7
70
20
dB
nS
channels (7 MHz filter)
Lowpass
Group delay variation from flatness
7 MHz filter
7/17
Electrical Characteristics
2.3.2 Chroma Section
STV6435
Test conditions: TAMB = 25°C, VCC = 5 V; VCCB = 5 V; RGENERATOR = 75 Ω and RLOUT = 75 Ω
unless otherwise specified.
Symbol
Parameter
DC Input Level
Test Conditions
Min.
Typ.
Max.
Unit
V
3
50
2
V
DCIN
R
C
V
Input Resistance
30
kΩ
pF
IN
IN
IN
Input Capacitance
Max Input Signal
V
1
2
PP
V
DYN
DC
Dynamic Output Signal
PP
DC Output Voltage (COUT)
-1 dB Bandwidth (Flatness)
-3 dB Bandwidth
Without signal
1.5
4.5
7
V
COUT
CF1
CF3
4
MHz
MHz
dB
CSBR
Stopband Rejection
27 MHz versus 100 kHz
= 1 V , Band = 15 kHz to
- 40
V
IN
PP
Flatness
Spread of Gain in Video Bands
±0.5
dB
dB
5 MHz for Y and CVBS
V
= 1 V at f = 3.58 MHz, on Y
Crosstalk Isolation of C from Y, RGB
and CVBS Channels
IN
PP
CCTo
55
or CVBS inputs, R
= 150Ω
LOAD
R
Output Resistance
5
6
10
6.5
20
Ω
dB
ns
OUT
V
V
= 1 V at f = 1 MHz
PP
GC
Gain on C channel
5.5
IN
IN
= 1 V at f = 3.58 MHz
CToYdel
Chroma to Luma Delay, source Y/C
PP
Voltage to be applied at CVBS_ENC
input for Y+C adder selection
V
V
YCadd
V
CC
CC
8/17
STV6435
Electrical Characteristics
2.3.3 RGB Section
Test conditions: TAMB = 25°C, VCC = 5 V; VCCB = 5 V; RGENERATOR = 75 Ω and RLOUT = 150 Ω,
unless otherwise specified.
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
DC Input Level, Bottom Clamp input
2.0
V
DCIN
Clamping Current, Bottom Clamp
input
I
at V
-400 mV
DCIN
1
2
mA
CLAMP
Input Leakage Current, Bottom
Clamp input
I
V
= V
+1 V
DCIN
1
10
µA
pF
LEAK
IN
C
Input Capacitance
Max Input Signal
2
IN
V
V
1.5
3
IN
PP
V
DYN
Dynamic Output Signal
PP
Video signal bottom sync at IC
output pin
DC
DC Output Voltage
0.5
V
RGBOUT
PF1
PF3
-1 dB Bandwidth (Flatness)
-3 dB Bandwidth
4
4.5
7.0
MHz
MHz
dB
PSBR
Stopband Rejection
27 MHz versus 100 kHz
- 40
V
= 1 V ,
PP
IN
Flatness
PCTo
Spread of Gain in Video Bands
±0.5
dB
dB
Band = 15 kHz to 5 MHz
V
= 1 V at f = 3.58 MHz,
IN
PP
Crosstalk Isolation of RGB from Y, C
and CVBS Channels
on Y, C or CVBS input,
R
55
= 150Ω
LOAD
R
Output Resistance
5
6
10
Ω
OUT
V
= 1 V at f = 1 MHz
GP
Gain on RGB channels
5.5
6.5
dB
IN
PP
2.3.4 Mute Section
Test conditions: TAMB = 25°C, VCC = 5 V; VCCB = 5 V; RGENERATOR = 75 Ω and RLOUT = 75 Ω
unless otherwise specified.
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
MUTE Voltage for Y/C/CVBS muted
and RGB muted
V
Pin MUTE to GND or logical 0
0
1.1
V
00
MUTE Voltage for Y/C/CVBS active
and RGB muted
Pin MUTE opened (not
connected) See Note 1.
V
1.3
1.9
4.2
1.7
4
V
V
V
01
Pin MUTE connected by 22 kΩ to
MUTE Voltage for Y/C/CVBS muted
and RGB active
V
10
VCC or at 3.3V (I < 140 µA)
IN
MUTE Voltage for Y/C/CVBS active
and RGB active
V
Pin MUTE to VCC (5V)
Vcc
11
Note: 1 When the MUTE pin is left open, its voltage is defined by an internal voltage divider performed by a
42 kΩ resistor to Vcc and 18 kΩ resistor to GND.
9/17
Input/Output Groups
STV6435
3
Input/Output Groups
Figure 4: Bottom Clamped Video Input
(Y_ENC, R_ENC, G_ENC and B_ENC)
Figure 6: Video Outputs
(CVBSOUT, YOUT, GOUT, ROUT and BOUT)
VCCB
VCCB
VCC 5 V
VCC 5 V
2V + VBE
10 kΩ
15 kΩ
GNDB
VREF
Mute
V
Protected Pad
GNDA
Figure 5: Average Clamped Video Input (C_ENC)
Figure 7: C Video Output (COUT)
VCCB
VCC 5 V
VCC 5 V
VCCB
5 kΩ
25 kΩ
Mute
2.3 V
VREF
V
25 kΩ
V
Protected Pad
GNDA
GNDB
10/17
STV6435
Input/Output Groups
Figure 8: Decoupling Capacitor (DEC)
VCC 5 V
VCC 5 V
10 kΩ
12 kΩ
12 kΩ
40 kΩ
1 kΩ
1 kΩ
1 kΩ
1 kΩ
Mute
Mute
Protected Pad
Figure 9: Mute (MUTE)
VCC 5 V
VCC 5 V
42 kΩ
18 kΩ
1.2 V
1.8 V
4.1 V
V
V
V
Protected Pad
Figure 10: CVBS Input (CVBS_ENC)
VCC 5 V
VCC 5 V
2V + VBE
10 kΩ
15 kΩ
4.1 V
V
Mute
Protected Pad
11/17
Input/Output Groups
STV6435
Figure 11: Power Supply Connection
Float
VCC
5 V
5 V
VCCB2
VCCB1
VCCB3
GND
GNDB
These symbols represent some huge diode and Zener-like components used for ESD
Protection of the device.
They are not supposed to be paths for any current in normal operation mode.
Table 2: Power Supply Connections
Supply
Description
VCCB1
VCCB2
VCCB3
GNDB
VCC
GOUT, ROUT and BOUT Supply
YOUT and COUT Supply
CVBSOUT Supply
Output Buffer Ground
Input Stages, Filters and 6-dB Amplifier Supply
Input Stages, Filters and 6-dB Amplifier Ground
GND
12/17
STV6435
Application Diagram
4
Application Diagram
Figure 12: Typical STV6435 Application Diagram
13/17
Package Mechanical Data
STV6435
5
Package Mechanical Data
Figure 13: 20-Pin Plastic Single in Line Package (PDIP20)
mm
Inches
Dim.
Min.
Typ.
Max.
Min.
Typ.
Max.
A
A1
A2
b
5.33
0.210
0.38
2.92
0.36
1.14
0.20
24.89
0.015
0.115
0.014
0.045
0.008
0.980
3.30
0.46
1.52
0.25
4.95
0.56
1.78
0.36
26.92
0.130
0.018
0.060
0.010
0.195
0.022
0.070
0.014
1.060
b2
c
D
e
2.54
6.35
3.30
0.100
0.250
0.130
E1
L
6.10
2.92
7.11
3.81
0.240
0.115
0.280
0.150
14/17
STV6435
Package Mechanical Data
Figure 14: 24-Pin Plastic Small Outline Package (SO24)
D
h x 45×
L
A
C
A1
a
e
B
E
H
mm
Inches
Typ.
Dim.
Min.
Typ.
Max.
Min.
Max.
A
A1
B
C
D
E
2.35
0.10
0.33
0.23
15.20
7.40
2.65
0.30
0.51
0.32
15.60
7.60
0.093
0.004
0.013
0.009
0.599
0.291
0.104
0.012
0.020
0.013
0.614
0.299
e
1.27
0.050
H
h
10.00
0.25
0°
10.65
0.75
8°
0.394
0.010
0°
0.419
0.030
8°
α
L
0.40
1.27
0.016
0.050
15/17
Revision History
STV6435
6
Revision History
Revision
Main Changes
Date
0.1
First Issue.
28 May 2002
Addition of Figure 12, Modification of Figure 3, RGB Bottom Clamp, RGB parameters
in Chapter 2: Electrical Characteristics and diagrams Chapter 3: Input/Output
Groups.
0.2
14 June 2002
Modification of Figure 3: STV6435 Block Diagram and Active Channel and Mute
values in Section 2.3: Electrical Characteristics.
1.0
21 June 2002
16/17
STV6435
NOTES:
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its
use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously
supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without
express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
© 2003STMicroelectronics - All Rights Reserved
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17/17
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