LT1203/LT1205
150MHz Video Multiplexers
FEATURES
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DESCRIPTIO
– 3dB Bandwidth: 150MHz
0.1dB Gain Flatness: 30MHz
Channel-to-Channel Switching Time: 25ns
Turn-On/Turn-Off Time: 25ns
High Slew Rate: 300V/µs
Disabled Output Impedance: 10MΩ
50mV Switching Transient
Channel Separation at 10MHz: > 90dB
Differential Gain: 0.02%
Differential Phase: 0.02°
Wide Supply Range:
±5V
to
±15V
Output Short-Circuit Protected
Push-Pull Output
The LT1203 is a wideband 2-input video multiplexer
designed for pixel switching and broadcast quality rout-
ing. The LT1205 is a dual version that is configured as a
4-input, 2-output multiplexer.
These multiplexers act as SPDT video switches with 10ns
transition times at toggle rates up to 30MHz. The – 3dB
bandwidth is 150MHz and 0.1dB gain flatness is 30MHz.
Many parts can be tied together at their outputs by using
the enable feature which reduces the power dissipation
and raises the output impedance to 10MΩ. Output capaci-
tance when disabled is only 3pF and the LT1203 peaks less
than 3dB into a 50pF load. Channel crosstalk and disable
isolation are greater than 90dB up to 10MHz. An on-chip
buffer interfaces to fast TTL or CMOS logic. Switching
transients are only 50mV with a 25ns duration. The
LT1203 and LT1205 outputs are protected against shorts
to ground.
The LT1203/LT1205 are manufactured using Linear
Technology’s proprietary complementary bipolar process.
The LT1203 is available in both the 8-lead PDIP and SO
package while the LT1205 is available in the 16-lead
narrow body SO package.
APPLICATI
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s
S
Broadcast Quality Video Multiplexing
Picture-in-Picture Switching
HDTV
Computer Graphics
Title Generation
Video Crosspoint Matrices
Video Routers
TYPICAL APPLICATI
High Speed RGB MUX
CHANNEL SELECT
RED 1
RED 2
V
–
Large-Signal Response
+1
+1
LT1205
+1
+1
V
+
EN
LOGIC
V
+
EN
LOGIC
V
OUT
GREEN
V
OUT
RED
GREEN 1
GREEN 2
V
–
BLUE 1
BLUE 2
V
–
+1
LT1203
+1
V
+
EN
LOGIC
LT1203 • TA01
V
OUT
BLUE
U
UO
UO
1
LT1203/LT1205
ABSOLUTE
AXI U
RATI GS
Operating Temperature Range ............... – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Junction Temperature (Note 5) ............................ 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
Supply Voltage ......................................................
±18V
Signal Input Current (Note 1) ............................
±20mA
Logic Input Current (Note 2)..............................
±50mA
Output Short-Circuit Duration (Note 3) ........ Continuous
Specified Temperature Range (Note 4) ....... 0°C to 70°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
V
IN0
1
GND 2
V
IN1
3
V
–
ORDER PART
NUMBER
8
7
6
5
V
+
V
OUT
EN
LOGIC
LT1203CN8*
LT1203CS8*
S8 PART MARKING
1203
4
N8 PACKAGE
S8 PACKAGE
8-LEAD PLASTIC DIP 8-LEAD PLASTIC SOIC
T
JMAX
= 150°C,
θ
JA
= 100°C/W (N)
T
JMAX
= 150°C,
θ
JA
= 150°C/W (S)
*See Note 4
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
0°C
≤
T
A
≤
70°C,
±5V ≤
V
S
≤ ±15V,
R
L
= 1k, pulse tested, EN pin open or high, unless otherwise noted.
SYMBOL
V
OS
∆V
OS
/∆T
I
IN
R
IN
C
IN
C
OUT
V
IN
PSRR
PARAMETER
Output Offset Voltage
Output Offset Matching
Output Offset Drift
Input Current
Input Resistance
Input Capacitance
Disabled Output Capacitance
Input Voltage (Note 1)
Power Supply Rejection Ratio
Gain Error
V
S
=
±5V,
V
IN
=
±2V
V
S
=
±15V,
V
IN
=
±2V
Input Selected
Input Deselected
EN Pin Voltage
≤
0.8V
V
S
=
±5V
V
S
=
±15V
V
S
=
±4.5
to
±15V
V
S
=
±15V,
V
IN
=
±2V,
R
L
= 1k
V
S
=
±15V,
V
IN
=
±2V,
R
L
= 400Ω
V
S
=
±5V,
V
IN
=
±2V,
R
L
= 1k
q
q
q
q
q
q
CONDITIONS
Any Input Selected
Between Outputs
q
q
q
q
q
q
2
U
U
W
W W
U
W
TOP VIEW
V
INO
1
GND 2
V
IN1
3
V
–
4
16 V
+
15 V
OUT1
14 EN1
13 LOGIC 1
12 V
+
11 V
OUT2
10 EN2
9
LOGIC 2
ORDER PART
NUMBER
LT1205CS*
V
IN2
5
GND 6
V
IN3
7
V
–
8
S PACKAGE
16-LEAD PLASTIC SOIC
T
JMAX
= 150°C,
θ
JA
= 100°C/W
MIN
TYP
10
0.3
40
0.6
MAX
30
5
5
UNITS
mV
mV
µV/°C
µA
MΩ
MΩ
pF
pF
pF
V
V
dB
1
2
5
5
2.6
2.6
2.8
±2
±2
60
±2.8
±3.0
70
2
6
3
4
10
6
%
%
%
LT1203/LT1205
ELECTRICAL CHARACTERISTICS
0°C
≤
T
A
≤
70°C,
±5V ≤
V
S
≤ ±15V,
R
L
= 1k, pulse tested, EN pin open or high, unless otherwise noted.
SYMBOL
V
OUT
PARAMETER
Output Voltage
Overload Swing (Note 1)
I
OUT
R
OUT
I
S
Output Current
Enabled Output Resistance
Disabled Output Resistance
Supply Current (LT1203)
Supply Current (LT1205)
V
IL
V
IH
Logic Low
Logic High
Enable Low
Enable High
I
IL
I
IH
I
EN
Digital Input Current Low
Digital Input Current High
Enable Pin Current
CONDITIONS
V
S
=
±15V,
V
IN
=
±2V,
R
L
= 400Ω
V
S
=
±5V,
V
IN
=
±2V,
R
L
= 1k
V
S
=
±15V,
V
IN
=
±5V
V
S
=
±5V,
V
IN
=
±5V
V
S
=
±15V,
V
IN
=
±2V,
R
L
= 400Ω
V
S
=
±5V,
V
IN
=
±2V,
R
L
= 1k
EN Pin Voltage = 2V, V
OUT
=
±2V,
V
S
=
±15V
EN Pin Voltage = 0.5V, V
OUT
=
±2V,
V
S
=
±15V
EN Pin Voltage = 2V
EN Pin Voltage = 0.5V
EN Pin Voltage = 2V
EN Pin Voltage = 0.5V
Logic Pin
Logic Pin
EN Pin
EN Pin
LT1203 Pin 5, LT1205 Pins 9, 13 = 0V
LT1203 Pin 5, LT1205 Pins 9, 13 = 5V
LT1203 Pin 6, LT1205 Pins 10, 14
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
MIN
±1.8
±1.8
TYP
±1.90
±1.94
±0.9
±0.9
MAX
UNITS
V
V
±1.5
±1.5
V
V
mA
mA
±4.5
±1.8
1
±4.75
±2.00
20
10
10.0
5.8
20.0
11.6
42
14
8
28
16
0.8
Ω
MΩ
mA
mA
mA
mA
V
V
V
V
µA
nA
µA
2
0.5
2
1.5
10
20
6.5
200
80
AC CHARACTERISTICS
SYMBOL
SR
FPBW
t
SEL
PARAMETER
Slew Rate (Note 6)
Full Power Bandwidth (Note 7)
Enable Time (Note 9)
Disable Time (Note 9)
t
r
, t
f
Small-Signal Rise and Fall Time
Propagation Delay
Overshoot
Crosstalk (Note 10)
Chip Disabled Crosstalk (Note 10)
Channel Select Output Transient
t
S
Settling Time
Differential Gain (Note 11)
Differential Phase (Note 11)
Insertion Loss
T
A
= 25°C, V
S
=
±15V,
R
L
= 1k, EN pin open or high, unless otherwise noted.
CONDITIONS
V
OUT
= 2V
P-P
R
L
= 1k
R
L
= 1k
V
OUT
= 250mV
P-P
, 10% to 90%
V
OUT
= 250mV
P-P
V
OUT
= 250mV
P-P
R
S
= 10Ω
R
L
= 10Ω, EN Pin Voltage
≤
0.8V
All V
IN
= 0V
1%, V
OUT
= 1V
V
S
=
±15V,
R
L
= 10k
V
S
=
±15V,
R
L
= 10k
R
L
= 100k, C
L
= 30pF, V
OUT
= 500mV
P-P
, f = 1MHz
MIN
180
28.6
TYP
300
47.7
25
25
20
2.6
2.9
5
90
110
50
30
0.02
0.02
0.02
35
35
35
MAX
UNITS
V/µs
MHz
ns
ns
ns
ns
ns
%
dB
dB
mV
P-P
ns
%
DEG
dB
Channel-to-Channel Select Time (Note 8) R
L
= 10k
The
q
denotes specifications which apply over the specified
temperature range.
Note 1:
The analog inputs (pins 1, 3 for the LT1203, pins 1, 3, 5, 7 for the
LT1205) are protected against ESD and overvoltage with internal SCRs.
For inputs
≤ ±2.8V
the SCR will not fire. Voltages above 2.8V will fire the
SCR and the DC current should be limited to 20mA. To turn off the SCR
the pin voltage must be reduced to less than 1V or the current reduced to
less than 600µA.
3
LT1203/LT1205
Note 2:
The digital inputs (pins 5, 6 for the LT1203, pins 9, 10, 13, 14 for
the LT1205) are protected against ESD and overvoltage with internal
SCRs. For inputs
≤ ±6V
the SCR will not fire. Voltages above 6V will fire
the SCR and the DC current should be limited to 50mA. To turn off the
SCR the pin voltage must be reduced to less than 2V or the current
reduced to less than 10mA.
Note 3:
A heat sink may be required depending on the power supply
voltage.
Note 4:
Commercial grade parts are designed to operate over the
temperature range of – 40°C to 85°C but are neither tested nor guaranteed
beyond 0°C to 70°C. Industrial grade parts specified and tested over
– 40°C to 85°C are available on special request, consult factory.
Note 5:
T
J
is calculated from the ambient temperature T
A
and the power
dissipation P
D
according to the following formulas:
LT1203CN8: T
J
= T
A
+ (P
D
×
100°C/W)
LT1203CS8: T
J
= T
A
+ (P
D
×
150°C/W)
LT1205CS: T
J
= T
A
+ (P
D
×
100°C/W)
Note 6:
Slew rate is measured at
±2.0V
on a
±2.5V
output signal while
operating on
±15V
supplies, R
L
= 1k.
Note 7:
Full power bandwidth is calculated from the slew rate
measurement:
FPBW = SR/2πV
PEAK
Note 8:
For the LT1203, apply 1VDC to pin 1 and measure the time for the
appearance of 0.5V at pin 7 when pin 5 goes from 5V to 0V. Apply 1VDC
to pin 1 and measure the time for disappearance of 0.5V at pin 7 when
pin 5 goes from 0V to 5V. Apply 1VDC to pin 3 and measure the time for
the appearance of 0.5V at pin 7 when pin 5 goes from 0V to 5V. Apply
1VDC to pin 3 and measure the time for disappearance of 0.5V at pin 7
when pin 5 goes from 5V to 0V. For the LT1205 the same test is
performed on both MUXs.
Note 9:
For the LT1203, apply 1VDC to pin 1 and measure the time for the
appearance of 0.5V at pin 7 when pin 6 goes from 0V to 5V. Pin 5 voltage
= 0V. Apply 1VDC to pin 1 and measure the time for disappearance of 0.2V
at pin 7 when pin 6 goes from 5V to 0V. Pin 5 voltage = 0V. Apply 1VDC
to pin 3 and measure the time for the appearance of 0.5V at pin 7 when
pin 6 goes from 0V to 5V. Pin 5 voltage = 5V. Apply 1VDC to pin 3 and
measure the time for disappearance of 0.2V at pin 7 when pin 5 goes from
5V to 0V. Pin 5 voltage = 5V. For the LT1205 the same test is performed
on both MUXs.
Note 10:
V
IN
= 0dBm (0.223V
RMS
) at 10MHz on one input with the other
input selected and R
S
= 10Ω. For disable crosstalk all inputs are driven
simultaneously. In disable the output impedance is very high and signal
couples across the package; the load impedance determines the crosstalk.
Note 11:
Differential gain and phase are measured using a Tektronix
TSG120 YC/NTSC signal generator and a Tektronix 1780R video
measurement set. The resolution of this equipment is 0.1% and 0.1°.
Ten identical MUXs were cascaded giving an effective resolution of
0.01% and 0.01°.
TRUTH TABLE
LOGIC
0
1
0
1
*Must be
≤0.5V
EN
1
1
0*
0
V
OUT
V
IN0
V
IN1
HIGH Z
OUT
HIGH Z
OUT
TYPICAL PERFOR A CE CHARACTERISTICS
±5V
Frequency Response
5
4
3
2
V
S
= ±5V
T
A
= 25°C
R
L
=
∞
0
–20
–40
–60
5
4
3
2
V
S
= ±15V
T
A
= 25°C
R
L
=
∞
GAIN (dB)
GAIN (dB)
1
0
–1
–2
–3
–4
–5
1
10
100
FREQUENCY (MHz)
4
U W
±15V
Frequency Response
0
–20
–40
–60
PHASE (DEG)
PHASE (DEG)
–80
–100
–120
–140
–160
–180
–200
1000
LT1203/05 • TPC01
1
0
–1
–2
–3
–4
–5
1
10
100
FREQUENCY (MHz)
–80
–100
–120
–140
–160
–180
–200
1000
LT1203/05 • TPC02
LT1203/LT1205
TYPICAL PERFOR A CE CHARACTERISTICS
– 3dB Bandwidth
vs Supply Voltage
200
T
A
= 25°C
R
L
= 10k
PEAKING
≤
0.5dB
180
FREQUENCY (MHz)
C
L
= 50pF
C
L
= 100pF
2
GAIN (dB)
C
L
= 10pF
CROSSTALK REJECTION (dB)
160
140
120
0
2
4
6
8
10
12
14
16
18
SUPPLY VOLTAGE (±V)
LT1203/05 • TPC03
Crosstalk Rejection
vs Frequency
–30
– 40
T
A
= 25°C
R
S
= 0Ω
R
L
=
∞
–30
DISABLE REJECTION (dB)
POWER SUPPLY REJECTION RATIO (dB)
CROSSTALK REJECTION (dB)
–50
– 60
–70
–80
– 90
V
S
= ±5V
V
S
= ±15V
–100
–110
1
10
FREQUENCY (MHz)
100
LT1203/05 • TPC06
Output Impedance (Enabled)
vs Frequency
100
80
V
S
= ±15V
T
A
= 25°C
OUTPUT IMPEDANCE (Ω)
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
60
40
30
20
10
10k
100k
1M
10M
FREQUENCY (Hz)
LT1203/05 • TPC09
U W
100M
Frequency Response
with Capacitive Loads
5
4
3
V
S
= ±15V
T
A
= 25°C
R
L
=
∞
C
L
= 20pF
–30
– 40
–50
– 60
Crosstalk Rejection
vs Frequency
V
S
= ±15V
T
A
= 25°C
R
L
=
∞
1
0
–1
–2
–3
–4
–5
1
R
S
= 75Ω
–70
–80
–90
R
S
= 37.5Ω
R
S
= 0Ω
R
S
= 10Ω
–100
–110
1
10
FREQUENCY (MHz)
100
LT1203/05 • TPC05
10
FREQUENCY (MHz)
100
LT1203/05 • TPC04
Disable Rejection
vs Frequency
–20
V
S
= ±15V
T
A
= 25°C
Power Supply Rejection Ratio
vs Frequency
70
60
–PSRR
50
40
+PSRR
30
20
10
0
1
10
FREQUENCY (MHz)
100
LT1203/05 • TPC08
– 40
–50
– 60
–70
–80
–90
R
L
=
∞
R
L
= 1k
V
S
= ±15V
T
A
= 25°C
R
L
=
∞
R
S
= 0Ω
–100
–110
–120
1
R
L
= 100Ω
R
L
= 10Ω
10
FREQUENCY (MHz)
100
LT1203/05 • TPC07
Supply Current
vs Supply Voltage (Enabled)
9.6
LT1203
R
L
=
∞
9.2
–55°
125°
25°
5.0
5.2
Supply Current
vs Supply Voltage (Disabled)
LT1203
R
L
=
∞
25°
125°
4.8
–55°
8.8
8.4
8.0
4.6
7.6
0
2
4
6
8 10 12 14
SUPPLY VOLTAGE (±V)
16
18
4.4
0
2
4
6
8 10 12 14
SUPPLY VOLTAGE (±V)
16
18
LT1203/05 • TPC10
LT1203/05 • TPC11
5
嵌入式系统
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