LMH6586 32x16 Video Crosspoint Switch
July 24, 2008
LMH6586
32x16 Video Crosspoint Switch
General Description
The LMH6586 is a non-blocking 32x16 analog video cross-
point switch. It can be used to route standard composite video
signals, (NTSC and PAL) and any one of the 32 inputs can
be routed to any one of the 16 outputs. The LMH6586 can
operate in broadcast mode as well as individual mode. The
outputs have programmable 1X or 2X gain output buffers and
can drive loads of 150Ω. Each input has an integrated DC-
restore clamp for AC-coupled operation.
The LMH6586 operates from a common single +5V supply for
its analog sections as well as its digital logic and I
2
C interface.
The LMH6586 also has two types of input signal detection
ideal for security camera monitoring. It can be configured to
output a flag upon the loss of sync with an external voltage
control pin used to set the sync detection threshold level. It
can also be configured to output a flag upon the detection of
presence or absence of video with an 8-level programmable
video detection threshold.
The crosspoint switch matrix configuration is programmed via
a 100 kHz I
2
C compatible interface. The device address is 2-
bit programmable, accommodating up to four LMH6586’s on
a common I
2
C bus, facilitating expansion of the Crosspoint
matrix.
The LMH6586 is offered in a space-saving 80-pin TQFP.
Features
■
32x16 Non-blocking Switch with buffered inputs and
■
■
■
■
■
■
■
■
■
■
■
■
■
outputs.
100 kHz I
2
C compatible interface
Individually addressable outputs
Input video clamp
Selectable output buffer gain (+1V/V or +2V/V)
−3 dB Bandwidth = 66 MHz
DG = 0.05%, DP = 0.05° @ R
L
= 150Ω
−70 dB off-isolation @ 6 MHz
I
2
C compatible interface with 2-bit programmable slave
address
Single +5V supply operation
Input and output amp power shutdowns
Video detect with 8 adjustable programmable threshold
level
Sync detect with adjustable programmable threshold level
Extra video output for external sync separator (OUT16)
Applications
■
CCTV security systems
■
Video routing
Typical Operating Circuit
30056946
LMH™ is a trademark of National Semiconductor Corporation.
© 2008 National Semiconductor Corporation
300569
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LMH6586
30056902
FIGURE 1. Functional Diagram
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LMH6586
Connection Diagram
30056901
Ordering Information
Package
80-Pin TQFP
Part Number
LMH6586VS
Package Marking
LMH6586VS
Transport Media
160 Units/Tray
NSC Drawing
VHB80A
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LMH6586
Pin Description
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
Pin Description
VIDEO INPUT 31
VIDEO INPUT 30
VIDEO INPUT 29
VIDEO INPUT 28
VIDEO INPUT 27
VIDEO INPUT 26
VIDEO INPUT 25
VIDEO INPUT 24
V
DD
+5V SUPPLY
GND
VIDEO INPUT 23
VIDEO INPUT 22
VIDEO INPUT 21
VIDEO INPUT 20
VIDEO INPUT 19
VIDEO INPUT 18
VIDEO INPUT 17
VIDEO INPUT 16
V
DD
+5V Supply
GND
REF_CAP1
VIDEO OUTPUT 16
VIDEO OUTPUT 15
VIDEO OUTPUT 14
VIDEO OUTPUT 13
VIDEO OUTPUT 12
VIDEO OUTPUT 11
VIDEO OUTPUT 10
VIDEO OUTPUT 9
VIDEO OUTPUT 8
GND
V
DD
+5V SUPPLY
VIDEO OUTPUT 7
VIDEO OUTPUT 6
VIDEO OUTPUT 5
VIDEO OUTPUT 4
VIDEO OUTPUT 3
VIDEO OUTPUT 2
VIDEO OUTPUT 1
VIDEO OUTPUT 0
Pin #
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
Pin Description
GND
V
DD
+5V SUPPLY
VIDEO INPUT 0
VIDEO INPUT 1
VIDEO INPUT 2
VIDEO INPUT 3
VIDEO INPUT 4
VIDEO INPUT 5
VIDEO INPUT 6
VIDEO INPUT 7
GND
V
DD
+5V SUPPLY
VIDEO INPUT 8
VIDEO INPUT 9
VIDEO INPUT 10
VIDEO INPUT 11
VIDEO INPUT 12
VIDEO INPUT 13
VIDEO INPUT 14
VIDEO INPUT 15
GAIN
V
DD
+5V SUPPLY
GND
REF_CAP2 (external coupling cap 0.1
μF)
SSR (Sync separator reference)
V_CLAMP
R_EXT (external resistor for bias)
GND
V
DD
+5V SUPPLY
POWER SAVE ENABLE (complete chip)
ADDRESS SELECT [0]
ADDRESS SELECT [1]
SDA
SCL
INPUT DETECT FLAG
DIGITAL V
DD
+5V SUPPLY
DIGITAL GND
GND
V
DD
+5V SUPPLY
RESET
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LMH6586
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
ESD Tolerance (Note 2)
Human Body Model
Machine Model
Supply Voltage (V
DD
)
Video Input Voltage Range, V
IN
2500V
250V
5V
−0.3V to V
DD
+0.3V
Storage Temperature Range
Lead Temperature (Soldering, 10 sec)
Junction Temperature
−65°C to +150°C
300°C
+150°C
Operating Ratings
Supply Voltage (V
DD
)
Ambient Temperature Range
θ
JA
(Note 1)
+5V ±10%
−40°C
≤
T
A
≤
85°C
25°C/W
Unless otherwise specified, all limits guaranteed for T
A
= 25°C, V
DD
= +5V,
R
EXT
= 10 kΩ
1%,
V
CLAMP
= 0.3V, R
L
= 150Ω,
C
L
= 12 pF.
Symbol
DC Specifications
V
DD
I
DD
A
V
Operating Supply Voltage
Supply Current
Power Save Supply Current
Gain
No Load, A
V
= 1 V/V
No Load, A
V
= 1 V/V
2x Gain Buffer
1x Gain Buffer
ΔA
V_CH-CH
Gain Matching (Ch to Ch)
V
OS
V
DET_LSB
V
DET
Output Offset Voltage
Video Detect Threshold LSB
Video Detect Threshold Offset
Video detection threshold offset
measured above sync tip
V
OUT
= 20 mV
PP
V
OUT
= 1.5 V
PP
10% to 90%, V
OUT
= 2 V
PP
50% to 50%, V
OUT
= 2 V
PP
50% to 50%, V
OUT
= 2 V
PP
f = 6 MHz, A
V
= 2 V/V
f = 6 MHz, A
V
= 2 V/V
A
V
= 2 V/V, 3.5 MHz
A
V
= 2 V/V, 3.5 MHz
A
V
= 1 V/V
A
V
= 1 V/V, No Load (referenced to
DC restored input)
85
1.92
0.95
2.00
0.99
1.2
60
95
±50
105
4.5
300
5.5
360
1.4
2.07
1.03
3
V
mA
μA
V/V
%
mV
mV
mV
Parameter
Conditions
Min
Typ
Max
Units
Electrical Characteristics
AC Specifications
BW
SS
BW
LS
t
r
/t
f
tp
t
pCh-Ch
CT
Off Iso
DG
DP
V
IL
V
IH
I
IN
V
OL
Small Signal Bandwidth (−3 dB)
Large Signal Bandwidth (−3 dB)
Rise/Fall Time
Propagation Delay
Ch-Ch Propagation Delay
Adjacent CH Crosstalk
Input-Output Off-Isolation
Differential Gain Error for NTSC
Differential Phase Error for NTSC
Low Input Voltage
High Input Voltage
Input Current
Low Output Voltage
I
OL
= 3 mA
3.3
±1
0.5
66
29
35
5
5
−58
−70
0.05
0.05
1.5
MHz
MHz
ns
ns
ns
dB
dB
%
deg
V
V
µA
V
I
2
C Interface and Digital Pin Logic Levels
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications, see the Electrical Characteristics tables.
Note 2:
Human Body Model, applicable std. MIL-STD-883, Method 3015.7. Machine Model, applicable std. JESD22-A115-A (ESD MM std. of JEDEC)
Field-Induced Charge-Device Model, applicable std. JESD22-C101-C (ESD FICDM std. of JEDEC).
Note 3:
The maximum power dissipation is a function of T
J(MAX)
and
θ
JA
. The maximum allowable power dissipation at any ambient temperature is
P
D
= (T
J(MAX)
– T
A
)/ θ
JA
. All numbers apply for packages soldered directly onto a PC Board.
Note 4:
All voltages are measured with respect to GND, unless otherwise specified.
5
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