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Электронный компонент: STV6436

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TARGET SPECIFICATION
STV6436
Filtered Video Buffers for STB and DVD Devices
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
September 2003
1/17
FEATURES
s
Y, C, CVBS Inputs with 7 MHz Filters
s
Y, Cr, Cb Inputs with 7 MHz Filters
s
6 dB Gains
s
Capabilities of Integrated Output Buffers:
Single Load (150
) for Y/Cr/Cb signals
Double Load (75
) for Y, C and CVBS signals
s
DC Coupled Outputs for CVBS and YCrCb
signals, DC or AC coupled output for Chroma
signal
s
Bottom Clamp on Y and CVBS, Bias Clamp
on C, Sync Clamps on Cr and Cb
s
Crosstalk: 55 dB (typ.)
s
Separate Stand-by Modes on Y/C/CVBS and
on Y/Cr/Cb signals
s
Switchable Y+C Adder for Decoders without
CVBS Outputs
DESCRIPTION
The STV6436 is a filtered video output interface for
STB and DVD applications.
After removing D/A conversion noises using
integrated low pass filters, the STV6436 adapts in
amplitude and impedance the video signals coming
from the digital decoder for transmission, via 75
adapted cables, to the TV set, VCR and auxiliary
devices.
The STV6436 is powered by a 5V supply.
The STV6436 is fully compatible with STi55xx
Digital Decoders.
The STV6436 is mounted in a SO24 package
(STV6436S) or in a DIP package (STV6436D).
Order Code: STV6436D
PDIP20
Order Code: STV6436S
SO24
STV6436
2/17
Table of Contents
Chapter 1
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
1.1
I/O Pin Description ............................................................................................................. 4
Chapter 2
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2.1
Absolute Maximum Ratings ................................................................................................ 6
2.2
Thermal Data ...................................................................................................................... 6
2.3
Electrical Characteristics ...................................................................................................... 6
2.3.1
Video Section (Y1, Y2 and CVBS Signals) ...........................................................................................................7
2.3.2
Chroma Section ....................................................................................................................................................8
2.3.3
Cb/Cr Section .......................................................................................................................................................9
2.3.4
Mute Section .........................................................................................................................................................9
Chapter 3
Input/Output Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Chapter 4
Package Mechanical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Chapter 5
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
3/17
STV6436
General Information
1
General Information
Figure 1: STV6436S Pinout
Figure 2: STV6436D Pinout
15
16
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
9
10
13
14
11
12
CVBS_ENC
DEC
C_ENC
GND
Y1_ENC
GND
GND
VCC
Y2_ENC
CR_ENC
MUTE
CB_ENC
VCCB3
CVBSOUT
VCCB2
COUT
GNDB
GND
GND
Y1OUT
Y2OUT
VCCB1
CROUT
CBOUT
1
2
3
4
5
6
7
8
9
10
11
12
20
19
18
17
16
15
14
13
CVBS_ENC
DEC
C_ENC
GND
Y1_ENC
VCC
Y2_ENC
CR_ENC
MUTE
CB_ENC
VCCB3
CVBSOUT
VCCB2
COUT
GNDB
Y1OUT
Y2OUT
VCCB1
CROUT
CBOUT
General Information
STV6436
4/17
1.1
I/O Pin Description
Table 1: Pin Description
STV6436S STV6436D
Name
Function
1
1
CVBS_ENC
CVBS Input from Encoder command internal CVBS switch
2
2
DEC
Decoupling Capacitor
3
3
C_ENC
Chroma Input from Encoder
4
4
GND
Ground
5
5
Y1_ENC
Y Input from Encoder
6
GND
Ground
7
GND
Ground
8
6
VCC
+5 V Supply
9
7
Y2_ENC
Large-band Y Input from Encoder
10
8
CR_ENC
Large-band Cr Input from Encoder
11
9
MUTE
4-State command for Mute
12
10
CB_ENC
Large-band Cb Input from Encoder
13
11
CBOUT
Cb Output
14
12
CROUT
Cr Output
15
13
VCCB1
+5 V Supply for Output Buffers
16
14
Y2OUT
Y2 Output
17
15
Y1OUT
Y1 Output
18
GND
Ground
19
GND
Ground
20
16
GNDB
Ground for Buffers
21
17
COUT
Chroma Output
22
18
VCCB2
+5 V Supply for Output Buffers
23
19
CVBSOUT
CVBS Output
24
20
VCCB3
+5 V Supply for Output Buffers
5/17
STV6436
General Information
Figure 3: STV6436 Block Diagram
Dig
ita
l
En
co
d
e
r
C_ENC
COUT
CVBSOUT
Y1_ENC
Y1OUT
Y2_ENC
Bot. Clamp
CR_ENC
CB_ENC
7 MHz
4th order
Y2_OUT
CR_OUT
CB_OUT
Sync
Extract.
Buffer
MUTE
CVBS_ENC
Buffer
Buffer
Buffer
Buffer
Buffer
6 dB
6 dB
6 dB
6 dB
6 dB
6 dB
7 MHz
4th order
7 MHz
4th order
7 MHz
4th order
7 MHz
4th order
7 MHz
4th order
Bot. Clamp
Bot. Clamp
Av. Clamp
Syn. Clamp
Syn. Clamp
Mute