September 2003
1/24
STV6412A
AUDIO/VIDEO SWITCH MATRIX
FEATURES
s
I
C Bus Control
s
Standby Mode with Interrupt Signal Output
s
Video Section
4 CVBS Inputs, 3 CVBS Outputs (one with
Selectable Chroma Trap Filter)
3 Y/C Inputs, 2 Y/C Outputs
6 dB Gain on all CVBS/Y and C Outputs
Integrated 150
Buffers
1 Y/C Adder
2 RGB/FB Inputs, 1 Tri-state RGB/FB Output
with 6 dB Adjustable Gain (from +3dB to
+9dB)
Video Muting on all Outputs
2 Slow Blanking Inputs/Outputs
Sync Bottom Clamp on all CVBS/Yand RGB
Inputs, Average Clamp on C Inputs
Bandwidth: 15 MHz
Crosstalk: 50 dB Minimum
s
Audio Section
4 Stereo Inputs, 3 Stereo Outputs
1 Mono-Sound Output
Stereo-to-Mono Sound Capability
0/6/9 dB Selectable Gain on one Stereo Input
Full Range Volume Control with Soft Control
Audio Muting on all Outputs
DESCRIPTION
The STV6412A is a highly integrated I
C bus-con-
trolled audio and video switch matrix, optimized
for use in digital set-top box applications. It pro-
vides all the audio and video routings required in a
full two SCART set-top box design.
TQFP64
(14 x 14 x 1.40 mm)
(Thin Full Plastic Quad Flat Pack)
ORDER CODE: STV6412ADT
1
Table of Contents
24
2/24
1 GENERAL OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 PIN CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 ELECTRICAL CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1.1
Thermal Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1.2
Latch Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 RECOMMENDED OPERATING CONDITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3 AUDIO SECTION CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.4 VIDEO SECTION CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.5 CHROMA SECTION CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.6 BLANKING SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.7 IC BUS CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3 I
2
C BUS SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1 I
2
C BUS ADDRESSES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2 POWER-ON RESET -- BUS REGISTER INITIAL CONDITIONS . . . . . . . . . . . . . . . . . . . 17
4 INPUT/OUTPUT GROUPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5 APPLICATION DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6 PACKAGE MECHANICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
1
STV6412A
3/24
1 GENERAL OVERVIEW
1.1 PIN CONNECTIONS
Figure 1. Pinout Diagram
Figure 2. Pin Description
Pin No.
Symbol
Description
1
V
CC
+5 V Supply
2
CVBSIN_AUX
CVBS Input from Auxiliary
3
DECV
Video Decoupling Capacitor
4
Y/CVBSIN_ENC
Y/CVBS Input from Encoder
5
GND
Ground
6
YIN_ENC
Y Input from Encoder
7
RIN_AUX
Audio Right Input from Auxiliary
8
CIN_ENC
Chroma Input from Encoder
9
LIN_AUX
Audio Left, Input from Auxiliary
10
R/CIN_ENC
Red/Chroma Input from Encoder
11
RIN_ENC
Audio Right, Input from Encoder
12
GIN_ENC
Green Input from Encoder
13
LIN_ENC
Audio Left, Input from Encoder
14
BIN_ENC
Blue Input from Encoder
15
NC
Not Connected
16
DECA
Audio Decoupling Capacitor
17
GND
Ground
18
Y/CVBSIN_VCR
Y/CVBS Input from VCR SCART
19
LIN_VCR
Audio Left, Input from VCR SCART
FBOUT_TV
FBIN_VCR
FBIN_ENC
C_GATE
VDD
ADD
SCL
SDA
GND
IT_OUT
SLB_TV
R/CIN_VCR
SLB_VCR
GIN_VCR
Vcc12
BIN_VCR
LO
U
T
_
T
V
FI
LTE
R
AO
U
T
_
R
F
VO
U
T
_
R
F
V
ccB
5
BO
UT
_
T
V
V
ccB
4
GO
U
T
_
T
V
G
NDB
R/
CO
UT
_
T
V
V
ccB
3
Y/
C
V
BSO
UT
_
T
V
V
ccB
2
CO
UT
_
V
CR
V
ccB
1
Y/
CVBSO
UT
_
V
CR
ROUT_TV
Vccao
LOUT_VCR
ROUT_VCR
LOUT_CINCH
ROUT_CINCH
NC
GNDA
VccA
RIN_TV
LIN_TV
CVBSIN_TV
RIN_VCR
LIN_VCR
Y/CVBSIN_VCR
GND
DECA
NC
BI
N_
ENC
LI
N
_
E
N
C
GIN
_
E
N
C
RI
N_
ENC
R/
CI
N_
ENC
LI
N
_
A
U
X
CI
N_
ENC
RI
N_
AUX
YI
N_
ENC
GN
D
Y/
CVBSI
N_
ENC
DECV
CVB
S
I
N
_
A
UX
Vc
c
1
STV6412A
4/24
20
RIN_VCR
Audio Right, Input from VCR SCART
21
CVBSIN_TV
CVBS Input from TV SCART
22
LIN_TV
Audio Left, Input from TV SCART
23
RIN_TV
Audio Right, Input from TV SCART
24
V
CCA
Audio Supply Voltage - or - Audio Supply Decoupling
25
GNDA
Audio Ground
26
NC
Not Connected
27
ROUT_CINCH
Audio Right Output to Cinch
28
LOUT_CINCH
Audio Left Output to Cinch
29
ROUT_VCR
Audio Right Output to VCR SCART
30
LOUT_VCR
Audio Left Output to VCR SCART
31
V
CCAO
Audio Output Supply Voltage - or - Main Audio Supply Voltage
32
ROUT_TV
Audio Right Output to TV SCART
33
LOUT_TV
Audio Left Output to TV SCART
34
FILTER
Chroma Trap Filter
35
AOUT_RF
Audio (L+R) Output to RF Modulator
36
VOUT_RF
CVBS Video Output to RF Modulator
37
V
CCB5
Video Output Buffer Supply Pin
38
BOUT_TV
Blue Output to TV SCART
39
V
CCB4
Video Output Buffer Supply Pin
40
GOUT_TV
Green Output to TV SCART
41
GNDB
Video Buffer Ground
42
R/COUT_TV
Red/Chroma Output to TV SCART
43
V
CCB3
Video Output Buffer Supply Pin
44
Y/CVBSOUT_TV
Y/CVBS Output to TV SCART
45
V
CCB2
Video Output Buffer Supply Pin
46
COUT_VCR
Chroma Output to VCR SCART
47
V
CCB1
Video Output Buffer Supply Pin
48
Y/CVBSOUT_VCR
Y/CVBS Output to VCR SCART
49
FBOUT_TV
Fast Blanking Output to TV SCART
50
FBIN_VCR
Fast Blanking Input from VCR SCART
51
FBIN_ENC
Fast Blanking Input from Encoder
52
C_GATE
External MOS Command for C_VCR bidirectional mode
53
V
DD
+5 V I
2
C Supply
54
ADD
I
2
C Address Selection
55
SCL
I
2
C Bus Clock
56
SDA
I
2
C Bus Data
57
GND
Ground Digital
58
IT_OUT
Interrupt Output
59
SLB_TV
Slow Blanking Input/Output from TV SCART
60
R/CIN_VCR
Red Input (or C Input) from VCR SCART
61
SLB_VCR
Slow Blanking Input/Output from VCR SCART
62
GIN_VCR
Green Input from VCR SCART
63
V
CC12
+12 V Supply
64
BIN_VCR
Blue Input from VCR SCART
Pin No.
Symbol
Description
STV6412A
5/24
Figure 3. STV6412A Block Diagram
3 to
9 dB
3 to
9 dB
3 to
9 dB
6 dB
6 dB
6 dB
C Switch
Y/CVBS Switch
6 dB
C Switch
RGB Switch
Y/CVBS Switch
SLOW BLANK
MONITOR
INTERRUPT
SIGNAL
VCR Switch
TV Switch
IC BUS
DECODER
-62 dB
-62 dB
0/6 dB
0/6 dB
0/6 dB
0/6 dB
0/6/9 dB
0/6/9 dB
FB Switch
0/6 dB
FBOUT_TV
BOUT_TV
GOUT_TV
R/COUT_TV
VOUT_RF
SLB_TV
SLB_VCR
Y/CVBSOUT_VCR
LOUT_VCR
ROUT_VCR
ROUT_CINCH
AOUT_RF
ROUT_TV
ADD
SDA
SCL
LIN_AUX
LIN_ENC
LIN_TV
RIN_AUX
RIN_ENC
RIN_TV
LIN_VCR
RIN_VCR
FBIN_ENC
FBIN_VCR
BIN_ENC
BIN_VCR
GIN_ENC
GIN_VCR
R/CIN_ENC
R/CIN_VCR
CIN_ENC
CVBSIN_AUX
Y/CVBSIN_VCR
YIN_ENC
Y/CVBSIN_ENC
CVBSIN_TV
FILTER
Y/CVBSOUT_TV
C_GATE
COUT_VCR
IT_OUT
LOUT_CINCH
LOUT_TV
FBIN_ENC
FBIN_VCR
BIN_ENC
BIN_VCR
GIN_ENC
GIN_VCR
R/CIN_ENC
R/CIN_VCR
R/CIN_VCR
R/CIN_ENC
CIN_ENC
CVBSIN_AUX
Y/CVBSIN_VCR
YIN_ENC
Y/CVBSIN_ENC
CVBSIN_AUX
CVBSIN_TV
Y_ENC
Y/CVBSIN_ENC
CIN_ENC
R/CIN_ENC
LIN_AUX
LIN_ENC
LIN_TV
RIN_AUX
RIN_ENC
RIN_TV
Mute
LIN_ENC
LIN_TV
RIN_AUX
RIN_ENC
RIN_TV
Mute
LIN_VCR
RIN_VCR
LIN_AUX
Mute
Mute
Mute
Mute
Mute
Mute
Mute
Mute
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