STV6688A [STMICROELECTRONICS]
Video Switch Matrix for TV Applications with S Terminal; 视频切换矩阵的电视应用程序与S端子
| 型号： | STV6688A |
| 厂家： | 
ST |
| 描述： | Video Switch Matrix for TV Applications with S Terminal |
| 文件： | 总12页 (文件大小：148K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
STV6688
Video Switch Matrix for TV Applications with S Terminal
PRODUCT PREVIEW
Key Features
■ I²C Bus Control
■ Standby Mode
■ 4 Y/CVBS Inputs (one for internal TV signal)
■ 4 C Inputs (one for internal TV signal)
■ 1 Y/C Adder
PDIP20
■ 1 Y/CVBS and 1 C Output, each with 0 dB gain
Order Code: STV6688
■ 1 CVBS Output with 6 dB gain and 150 Ω
Buffer for Monitor
■ SYNC Bottom Clamp on all CVBS/Y and
Average Bias on C Inputs
■ Bandwidth: 15 MHz
■ Crosstalk: 50 dB (min.)
PSO20
Order Code: STV6688A
General Description
Pin Connections
The STV6688 is a highly-integrated I²C bus-
controlled video switch matrix, optimized for use in
color TV applications.
Y/CVBS_IN1
C_IN1
DEC
20
19
18
17
16
15
14
13
12
11
1
Y/CVBS_IN_TV
C_IN_TV
VCC_B
2
It is used to control the switching of 4 video signals.
These signals can be in Single Component form
(CVBS) or in Two Component form (Y/C). In both
cases, the STV6688 microcontroller provides a
CVBS signal for an external device (monitor).
VCC_V
3
Y/CVBS_IN2
C_IN2
4
CVBS_OUT
GND_B
5
GND_V
Y/CVBS_IN3
C_IN3
6
Y/CVBS_OUT
C_OUT
7
8
9
VDD
GND
10
SDA
SCL
September 2003
1/12
This is preliminary information on a new product now in development. Details are subject to change without notice.
Functional Description
STV6688
1
Functional Description
Table 1: Pin List
Pin
Pin
Symbol
Description
Symbol
SCL
Description
1
2
Y/CVBS_IN1
C_IN1
Y or CVBS Signal of Ext. Input 1
C Signal of Ext. Input 1
11
12
13
14
15
16
17
18
19
20
Serial Clock Line Input
Digital Parts Ground
C Signal Output
GND
3
VCC_V
Video Switch Power Supply
Y or CVBS Signal of Ext. Input 2
C Signal of Ext. Input 2
C_OUT
4
Y/CVBS_IN2
C_IN2
Y/CVBS_OUT
GND_B
Y/CVBS Output
5
Buffer Ground
6
GND_V
Y/CVBS_IN3
C_IN3
Video Switch Ground
CVBS_OUT
VCC B
Y and C Adder Output
Buffer Power Supply
C Signal of TV Input
Y or CVBS Signal of TV Input
Decoupling
7
Y or CVBS Signal of Ext. Input 3
C Signal of Ext. Input 3
8
C_IN_TV
Y/CVBS_IN_TV
DEC
9
VDD
Digital Parts Power Supply
Serial Data Line Input
10
SDA
Figure 1: STV6688 Block Diagram
Y/CVBS_IN TV
19
Y/CVBS_IN1
Y/CVBS_IN2
Y/CVBS_IN3
1
4
Y/CVBS_OUT
14
0dB
7
CVBS_OUT
+
Buffer
6dB
16
Clamp
Clamp
18
2
C_IN TV
C_IN1
0dB
13 C_OUT
C_IN2
Clamp
Clamp
5
Mute
C_IN3
8
Buffer
Power
Supply
V
REF
17
3
V
V
B
V
CC
Video
Power
Supply
CC
V
DD
9
DEC
I²C Bus Decoder
20
12
15
6
11
10
GND
SDA
SCL
GND B
GND V
2/12
STV6688
Electrical Characteristics
2
Electrical Characteristics
TAMB = 25°C, VCCV = VCCB = VDD = 5V, RLoadYC = 4.7 kΩ, RLoadCVBS = 150 Ω, unless otherwise
specified.
Symbol
Parameter
Digital Supply Voltage
Test Conditions
Min.
Typ.
Max.
Unit
V
4.5
4.5
4.5
5
5
5
5.5
5.5
5.5
V
V
V
DD
V
Video Operating Supply Voltage
Buffer Supply Voltage
CC
V
CCB
Active (Channels ON)
Digital Supply Current
Total Video Supply Current
I
V
= 5 V
DD
3
mA
mA
DD
I
V
V
= 5 V, No load
CC
13
25
CCV
(V
V
)
= V
= 5V, with loads and
CCB
CC, CCBi
CCV
signals
Standby (All Channels OFF)
Digital Supply Current
I
V
V
= 5 V
3
mA
mA
DD
DD
I
Total Video Supply Current
= 5 V
0.3
CCVstd
CC
2.1
Thermal Data
Symbol
Parameter
Package
Value
Unit
R
Maximum Junction-to-Ambient Thermal Resistance
DIP20 (STV6688)
80
°C/W
°C/W
thJA
SO20 (STV6688A)
100
2.2
Y/CVBS Section
TAMB = 25°C, VCCV = VCCB = VDD = 5V, RLoadYC = 4.7 kΩ, RLoadCVBS = 150 Ω, unless otherwise
specified.
Symbol
Parameter
DC Input Level
Test Conditions
Bottom Sync pulse
Min.
Typ.
Max.
Unit
V
2
2
1
2
V
DCIN
I
Clamping Current
at V
-400 mV
= V + 1 V
DCIN
1
mA
µA
pF
CLAMP
DCIN
I
Input Leakage Current
Input Capacitance
V
10
LEAK
IN
C
IN
V
Max Input Signal
V
= 5 V
V
1.5
1.5
3
IN
CC
PP
DYNY
Dynamic Y/CVBS Output Signal
V
= 5 V
= 5 V
V
CC
PP
DYNCVBS Dynamic CVBS Output Signal
BW Bandwidth at -3 dB
V
V
CC
PP
MHz
Y/CVBS
Y/C Mixer (on CVBS_OUT)
V
= 1 V
12
8
15
10
IN
PP
V
= 1 V
PP
IN
3/12
Electrical Characteristics
STV6688
Unit
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Flatness
Spread of Gain in Video Band
(15 kHz-5 MHz)
Y/CVBS
V
V
= 1 V
±0.2
±0.5
±0.5
±1.0
dB
IN
IN
PP
PP
Y/C Mixer (on CVBS_OUT)
= 1 V
CTi
Crosstalk Isolation between
Y/CVBS Input Channels
V
= 1 V at f = 4.43 MHz, on
PP
IN
55
50
60
55
dB
dB
one point.
V = 1 V at f = 4.43 MHz, on
IN
CTo
Crosstalk Isolation of Y/CVBS from C
Channels
PP
one point.
GYCVBS
GCVBS
Gain at Y/CVBS out @1 MHz
Gain at CVBS out @1 MHz
Y/CVBS Output Resistance
CVBS Output Resistance
V
= 1 V
= 1 V
-0.5
5.5
0
6
+0.5
6.5
5.0
5
dB
dB
Ω
IN
IN
PP
PP
V
R
2.5
1
OUTY
R
Ω
OUTCVBS
G
Gain matching between Y, CVBS
inputs
V
= 1 V
YCVBSM
IN
PP
-0.5
0
+0.5
dB
DC
DC CVBS Output voltage
DC Y Output voltage
Differential Phase
Bottom sync pulse
0.8
1.3
1
V
V
OUTCVBS
DC
Bottom sync pulse for Y
OUTY
DPHI
V
V
= 1 V at f = 4.43 MHz
3
5
3
deg
IN
IN
PP
DG
Differential Gain
= 1 V at f = 4.43 MHz
1
%
%
PP
LNL
Luminance non-linearity
Video S/N ratio
0.6
VSN
Refer to Note 1
65
dB
Note: 1 S/N = 20log (VOUT Black to White = 0.7 VPP/VNoise (mVRMS) weighted CCIR567).
2.3
Chroma Section
TAMB = 25°C, VCCV = VCCB = VDD = 5V, RLoadYC = 4.7 kΩ, RLoadCVBS = 150 Ω, unless otherwise
specified.
Symbol
Parameter
DC Input Level
Test Conditions
Min.
Typ.
3
Max.
Unit
V
V
DCIN
R
C
V
Input Resistance
30
50
2
kΩ
pF
IN
IN
IN
Input Capacitance
Max Input Signal
1.5
1.5
V
V
PP
PP
DYN
CBW
CTi
Dynamic Output Signal
Chroma Bandwidth
C = 1 V
10
55
12
60
MHz
dB
IN
PP
Crosstalk Isolation between C Input
Channels
C
= 0. 5V at f = 4.43 MHz, on
PP
IN
one point.
CTo
Crosstalk Isolation of C from Y
Channels
V
= 1 V at f = 4.43 MHz, on
50
55
dB
IN
PP
one point.
R
Output Resistance
2.5
0
5.0
Ω
dB
V
OUT
G
Gain at C_OUT @4.43 MHz
DC Output voltage
V
= 1 V
PP
-0.5
+0.5
OUTC
IN
DC
2.2
OUTC
4/12
STV6688
Electrical Characteristics
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
+0.5
10
Unit
dB
G
Gain matching between C inputs
Chroma to Luma delay, Y/C source
V
V
= 1 V
-0.5
0
5
CM
IN
PP
CToYdel
@4.43 MHz
ns
PP
5/12
Electrical Characteristics
STV6688
2.4
I²C Bus Characteristics
TAMB = 25°C, VCCV = VCCB = VDD = 5V, RLoadYC = 4.7 kΩ, RLoadCVBS = 150 Ω, unless otherwise
specified.
Symbol
Address Selection Input
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
ADDsel_L Address Selection Low Level
ADDsel_H Address Selection High Level
0
0.2
V
V
2.5
V
DD
ILEAK
SCL
Leakage Current
10
µA
V
Low Level Input Voltage
High Level Input Voltage
Input Leakage Current
-0.3
3
1.5
5.5
10
V
V
IL
IH
LI
V
I
V
= 0 to 5.5 V
-10
0
µA
IN
IN
SDA
V
Low Level Input Voltage
High Level Input Voltage
Input Leakage Current
Input Capacitance
-0.3
3
1.5
5.5
10
V
V
IL
IH
LI
V
I
V
= 0 to 5.5 V
-10
0
µA
pF
µs
ns
V
C
10
I
t
Input Rise Time
1.5 V to 3 V
3 V to 1.5 V
1
R
t
Input Fall Time
300
0.4
250
400
F
V
Low Level Output Voltage
Output Fall Time
I
= 3 mA
OL
OL
t
3 V to 1.5 V
ns
pF
F
C
Load Capacitance
L
Timing (Clock Frequency = 100 kHz, see Note 2)
t
Clock Low Period
4.7
4
µs
µs
ns
ns
µs
µs
µs
µs
LOW
t
Clock High Period
HIGH
t
Data Setup Time
250
0
SU,DAT
HD,DAT
SU,STO
t
Data Hold Time
340
t
Setup Time from Clock High to Stop
Start Setup Time following a Stop
Start Hold Time
4
t
4.7
4
BUF
t
t
HD,STA
SU,STA
Start Setup Time following Clock Low
to High Transition
4.7
Note: 2 The device can also operate at 400 kHz.
6/12
STV6688
Electrical Characteristics
Figure 2: I²C Bus Timings
SDA
SCL
SDA
t
t
t
f
BUF
LOW
t
t
t
t
t
HD,STA
r
HD,DAT
HIGH
SU,DAT
t
(Start, Stop)
SU,STA
t
SU,STO
The I²C Bus Decoder of the
microcontroller provides the Automatic
Incrementation mode in Write mode.
2.5
I²C Bus Selection
Data transfers follow the usual I²C format:
after the Start condition (S), a 7-bit slave
address is sent, followed by an 8-bit word
which is a data direction bit (W). An 8-bit
sub-address is sent to select a register,
followed by an 8-bit data word to be
included in the register.
String Format: Write Only mode (S =
Start condition, P = Stop condition, A
= Acknowledge)
S
SLAVE ADDRESS: 94h
A
00h
A
DATA
A
P
Input Signals Summary: (Write
Mode)
Data
Reg.Addr.
D7
D6
D5
D4
D3
D2
D1
D0
(Hex)
General
Stand-by
Buffer
Stand-by
Always set
to 1
Switch Control
Input Signal: (Write Mode) Data Byte
Data
Reg.
Addr.
Description
Bits
Comments
D7
D6
D5
D4 D3
D2
D1
D0
0x00
General Stand-by
Buffer Stand-by
1
1
2
0
1
X
X
1
1
X
X
X
X
X
X
X
X
X
X
All disabled
All active
X
X
0
1
1
1
X
X
X
X
X
X
X
X
X
X
Buffer disabled
Buffer active
Y/CVBS and
C Selection
X
X
X
X
X
X
X
X
1
1
1
1
X
X
X
X
X
X
X
X
X
X
X
X
0
0
1
1
0
1
0
1
INT TV
IN1
IN2
IN3
7/12
Input/Output Groups
STV6688
3
Input/Output Groups
Figure 3: Bottom Clamped Video Inputs
(Pins 1, 4, 7 and 19)
VCC 5 V
VCC 5 V
2 V + VD
15 kΩ
tri
Protected Pad
Figure 4: Average Clamped Video Inputs
(Pins 2, 5, 8 and 18)
VCC 5 V
VCC 5 V
IB
25 kΩ
25 kΩ
3 V
tri
Protected Pad
Figure 5: Video Outputs (Pins 13, 14 and 16)
VCCB1,2 ...7 5 V
VCC 5 V
IB
Protected Pad
8/12
STV6688
Input/Output Groups
Figure 6: I²C Bus SDA (Pin 10)
VDD 5 V
Float
Acknowledge
10 kΩ
Protected Pad
Figure 7: I²C Bus SCL (Pin 11)
VDD 5 V
Float
10 kΩ
Protected Pad
9/12
Package Mechanical Data
STV6688
4
Package Mechanical Data
Figure 8: 20-Pin Plastic Single in Line Package (PDIP20)
mm
Inches
Typ.
Dim.
Min.
Typ.
Max.
Min.
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
10/12
STV6688
Package Mechanical Data
Figure 9: 20-Pin Plastic Small Outline Package, 300-mil Width (PSO20)
mm
Inches
Typ.
Dim.
Min.
Typ.
Max.
Min.
Max.
A
A1
B
C
D
E
2.35
0.10
0.33
2.65
0.0926
0.0040
0.0130
0.1043
0.51
0.32
0.0200
0.0125
0.5118
0.2992
4.98
7.40
13.00
7.60
0.1961
0.2914
e
1.27
0.050
H
h
10.01
0.25
0°
10.64
0.74
8°
0.394
0.010
0°
0.419
0.029
8°
K
L
0.41
1.27
0.10
0.016
0.050
0.004
G
Number of Pins
20
N
11/12
STV6688
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
© 2003 STMicroelectronics - All Rights Reserved
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12/12
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