Datasheet

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LT1203/LT1205

150MHz Video Multiplexers

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–3dB Bandwidth: 150MHz

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0.1dB Gain Flatness: 30MHz

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Channel-to-Channel Switching Time: 25ns

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Turn-On/Turn-Off Time: 25ns

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High Slew Rate: 300V/µs

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Disabled Output Impedance: 10MΩ

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50mV Switching Transient

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Channel Separation at 10MHz: >90dB

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Differential Gain: 0.02%

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Differential Phase: 0.02°

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Wide Supply Range: ±5V to ±15V

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Output Short-Circuit Protected

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Push-Pull Output

ESCRIPTIO

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.

ITY

LT1205

LOGIC

OUT

RED

OUT

GREEN

OUT

BLUE

LT1203 • TA01

RED 1

CHANNEL SELECT

RED 2

GREEN 1

GREEN 2

BLUE 1

BLUE 2

–

LT1203

LOGIC

High Speed RGB MUX

Large-Signal Response

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Broadcast Quality Video Multiplexing

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Picture-in-Picture Switching

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HDTV

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Computer Graphics

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Title Generation

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Video Crosspoint Matrices

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Video Routers

Summary of content (16 pages)

PAGE 1
LT1203/LT1205 150MHz Video Multiplexers U DESCRIPTIO FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ – 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.
PAGE 2
LT1203/LT1205 W W W AXI U U ABSOLUTE RATI GS 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 Operating Temperature Range ............... – 40°C to 85°C Storage Temperature Range ................
PAGE 3
LT1203/LT1205 ELECTRICAL CHARACTERISTICS 0°C ≤ TA ≤ 70°C, ±5V ≤ VS ≤ ±15V, RL = 1k, pulse tested, EN pin open or high, unless otherwise noted. SYMBOL PARAMETER CONDITIONS VOUT Output Voltage VS = ±15V, VIN = ±2V, RL = 400Ω VS = ±5V, VIN = ±2V, RL = 1k ● ● Overload Swing (Note 1) VS = ±15V, VIN = ±5V VS = ±5V, VIN = ±5V ● ● IOUT Output Current VS = ±15V, VIN = ±2V, RL = 400Ω VS = ±5V, VIN = ±2V, RL = 1k ● ● ±4.5 ±1.8 ±4.75 ±2.
PAGE 4
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.
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LT1203/LT1205 W U TYPICAL PERFOR A CE CHARACTERISTICS – 3dB Bandwidth vs Supply Voltage Frequency Response with Capacitive Loads 5 TA = 25°C RL = 10k PEAKING ≤ 0.
PAGE 6
LT1203/LT1205 W U TYPICAL PERFOR A CE CHARACTERISTICS Gain Error vs Temperature Input Bias Current vs Input Voltage 8 1.2 RL = 400Ω 6 GAIN ERROR (%) 1.0 5 4 3 RL = 1k 2 VS = ±15V RL = ∞ 3 125°C 0.8 OUTPUT VOLTAGE (V) VS = ±15V VIN = –2V TO 2V INPUT BIAS CURRENT (µA) 7 Output Voltage vs Input Voltage 4 25°C 0.6 –55°C 0.4 0.2 0 50 25 75 0 TEMPERATURE (°C) 100 – 0.4 –4 125 2 1 0 –1 –2 –3 – 0.
PAGE 7
LT1203/LT1205 W U TYPICAL PERFOR A CE CHARACTERISTICS Channel 1 Enable Channel 1 Disable EN (PIN 6) EN (PIN 6) VOUT (PIN 7) VOUT (PIN 7) W U UO APPLICATI VS = ±15V VINO = 1V RL = 1k VIN1 = 0V LT1203/05 • TPC19 VINO = 1V VIN1 = 0V LT1203/05 • TPC20 U VS = ±15V RL = 1k S I FOR ATIO Input Protection The logic inputs have ESD protection (≥ 2kV) and shorting them to 12V or 15V will cause excessive current to flow. Limit the current to less than 50mA when driving the logic above 6V.
PAGE 8
LT1203/LT1205 W U U UO APPLICATI S I FOR ATIO CMOS MUX Channel-to-Channel Switching Transient only 10mVP-P. A photo of the switching transients from a CMOS MUX shows glitches to be 50 times larger than on the LT1203. Also shown is the output of the LT1203 switching on and off a 2MHz sinewave cleanly and without abnormalities.
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LT1203/LT1205 U W U UO APPLICATI S I FOR ATIO 4 VS = ±15V RL = 150Ω RF = RG = 1.3k 3 2 GAIN (dB) WORKSTATION OUTPUT 1 R, B 0 G –1 –2 RGB MUX OUTPUT –3 –4 1 LT1203/05 • F02a 10 100 FREQUENCY (MHz) 1000 LT1203/05 • F04 Figure 2a. Workstation and RGB MUX Output Figure 4. RGB MUX Frequency Response of Demonstration Board #041 Input Expansion WORKSTATION OUTPUT The output impedance of the LT1203/LT1205 is typically 20Ω when enabled and 10MΩ when disabled or not selected.
PAGE 10
LT1203/LT1205 041A R1 LOGIC ENABLE V– V+ GND R1 R R2 R2 U1 R3 R11 R7 R10 C3 U3 R12 G1 R17 G R13 C1 U2 G2 R16 C2 R18 R8 R14 R15 C4 R9 B R4 B1 R5 B2 (408) 432-1900 LT1203/LT1205 FAST SWITCHING RGB MULTIPLEXER DEMO BOARD R6 COPYWRITE '93 MADE IN USA LT1205/03 • F03 Figure 3.
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LT1203/LT1205 W U U UO APPLICATI S I FOR ATIO –15V 15V GND 5V C1 0.1µF A 16 1 CH0 R1 75Ω 15 16 +1 C2 0.1µF 14 2 15 3 14 13 13 12 12 11 11 10 10 9 9 7 4 5 6 7 8 1 +1 +1 +1 U1 LT1205 3 4 5 6 7 8 4 5 6 7 8 1 4 5 6 7 8 R16 75Ω C3 0.1µF B Y2 C B 1 2 C 3 D Y3 U5 Y4 74HCT238 Y5 G1 Y6 G2B Y7 G2A EN 6 5 4 14 +1 13 12 +1 + 11 10 +1 U2 LT1205 C5 4.7µF 2 U6 LT1252 9 3 7 + – 6 RS 75Ω OUTPUT 4 RF 1.6k C6 4.7µF 16 +1 RG 1.
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LT1203/LT1205 W U U UO APPLICATI S I FOR ATIO 16-to-1 MUX Response output impedance of only 25Ω at 10MHz. This attenuator is responsible for the outstanding All Hostile Crosstalk Rejection of 90dB at 10MHz with 15 input signals. Several suggestions to attain this high rejection include: 16-to-1 MUX, Switching LT1205 Enable Lines 5V SELECT LINE C 0V 0 GAIN (dB) 1. Mount the feedback resistors for the surface mount LT1252 on the back side of the PC board. 2.
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LT1203/LT1205 W U U UO APPLICATI S I FOR ATIO –5V 5V GND 3 C1 0.1µF CH0 J1 1 R1 75Ω 2 3 4 5 6 7 8 C2 0.1µF 16 +1 2 4 5 CH1 J2 6 7 R2 75Ω 8 R3 75Ω R5 10k 13 R10 820Ω 12 +1 11 10 +1 U1 LT1205 5 9 R6 10k 16 +1 + U6 B LT1254 – R11 820Ω R12 820Ω 14 +1 + 12 +1 11 10 10 +1 U2 LT1205 9 9 16 +1 15 14 6 7 8 C5 4.
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LT1203/LT1205 U W U UO APPLICATI S I FOR ATIO those used in the 16-to-1 crosspoint with one additional suggestion: Surround the LT1205 output traces by ground plane and route them away from the (–) inputs of the other three LT1254s. Each pair of logic inputs labeled Select Logic Output is used to select a particular output. The truth table is used to select the desired input and is applied to each pair of logic inputs.
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LT1203/LT1205 W W SI PLIFIED SCHE ATIC V+ 2V V– OFF IN 0 V– IN 1 OUT V+ ENABLE V+ LOGIC –2V LOGIC V– GND LT1203/05 • SS PACKAGE DESCRIPTIO U Dimensions in inches (millimeters) unless otherwise noted. N8 Package 8-Lead Plastic DIP 0.400 (10.160) MAX 8 7 6 5 0.250 ± 0.010 (6.350 ± 0.254) 1 0.300 – 0.320 (7.620 – 8.128) 0.009 – 0.015 (0.229 – 0.381) ( +0.025 0.325 –0.015 8.255 +0.635 –0.381 ) 2 0.045 – 0.065 (1.143 – 1.651) 3 4 0.130 ± 0.005 (3.302 ± 0.127) 0.065 (1.
PAGE 16
LT1203/LT1205 PACKAGE DESCRIPTIO U Dimensions in inches (millimeters) unless otherwise noted. S8 Package 8-Lead Plastic SOIC 0.189 – 0.197* (4.801 – 5.004) 7 8 5 6 0.150 – 0.157* (3.810 – 3.988) 0.228 – 0.244 (5.791 – 6.197) 1 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 3 2 4 0.053 – 0.069 (1.346 – 1.752) 0.004 – 0.010 (0.101 – 0.254) 0°– 8° TYP 0.016 – 0.050 0.406 – 1.270 0.050 (1.270) BSC 0.014 – 0.019 (0.355 – 0.