Datasheet

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LT1193

1193fb

Video Difference

Amplifier

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Differential or Single-Ended Gain Block (Adjustable)

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–3dB Bandwidth, A

= ±2: 80MHz

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Slew Rate: 500V/µs

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Low Cost

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Output Current: ±50mA

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Settling Time: 180ns to 0.1%

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CMRR at 10MHz: > 40dB

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Differential Gain Error: 0.2%

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Differential Phase Error: 0.08°

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Single 5V Operation

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Drives Cables Directly

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Output Shutdown

The LT

1193 is a video difference amplifier optimized for

operation on ±5V and a single 5V supply. This versatile

amplifier features uncommitted high input impedance (+)

and (–) inputs, and can be used in differential or single-

ended configurations. Additionally, a second set of inputs

give gain adjustment and DC control to the differential

amplifier.

The LT1193’s high slew rate, 500V/µs, wide bandwidth,

80MHz, and ±50mA output current make it ideal for

driving cables directly. The shutdown feature reduces the

power dissipation to a mere 15mW and allows multiple

amplifiers to drive the same cable.

The LT1193 is available in 8-pin PDIP and SO packages.

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Line Receivers

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Video Signal Processing

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Cable Drivers

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Oscillators

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Tape and Disc Drive Systems

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

, LTC and LT are registered trademarks of Linear Technology Corporation.

LT1193 • TA01

75Ω

CABLE

LT1193

–5V

75Ω

–

300Ω

OUT

Cable Sense Amplifier for Loop Through Connections with DC Adjust

Summary of content (12 pages)

PAGE 1
LT1193 Video Difference Amplifier U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO The LT®1193 is a video difference amplifier optimized for operation on ±5V and a single 5V supply. This versatile amplifier features uncommitted high input impedance (+) and (–) inputs, and can be used in differential or singleended configurations. Additionally, a second set of inputs give gain adjustment and DC control to the differential amplifier.
PAGE 2
LT1193 W W W AXI U U ABSOLUTE RATI GS U U W PACKAGE/ORDER I FOR ATIO (Note 1) Total Supply Voltage (V + to V –) .............................. 18V Differential Input Voltage ........................................ ± 6V Input Voltage .......................................................... ± VS Output Short-Circuit Duration (Note 2) ......... Continuous Operating Temperature Range LT1193M (OBSOLETE) ................ – 55°C to 125°C LT1193C ..................................................
PAGE 3
LT1193 ELECTRICAL CHARACTERISTICS VS = ±5V, VREF = 0V, RFB1 = 900Ω from Pins 6 to 8, RFB2 = 100Ω from Pin 8 to ground, RL = RFB1 + RFB2 = 1k (Note 3), TA = 25°C, CL ≤ 10pF, Pin 5 open circuit, unless otherwise noted. SYMBOL PARAMETER IS Supply Current CONDITIONS MIN LT1193M/C/I TYP MAX 35 UNITS 43 mA 1.
PAGE 4
LT1193 ELECTRICAL CHARACTERISTICS The ● denotes the specificatons which apply over the full operating temperature range of – 40°C ≤ TA ≤ 85°C. VS = ±5V, VREF = 0V, RFB1 = 900Ω from Pins 6 to 8, RFB2 = 100Ω from Pin 8 to ground, RL = RFB2 = 1k (Note 3), CL ≤ 10pF, Pin 5 open circuit, unless otherwise noted.
PAGE 5
LT1193 U W TYPICAL PERFOR A CE CHARACTERISTICS Input Bias Current vs Common Mode Voltage –0.3 VS = ±5V INPUT BIAS CURRENT (µA) INPUT BIAS CURRENT (µA) 3 2 1 25°C 0 Common Mode Voltage vs Supply Voltage –55°C 125°C –1 10 VS = ±5V –0.4 +IB –0.5 IOS –0.6 –IB –0.7 –55°C 25°C 8 COMMON MODE VOLTAGE (V) 4 Input Bias Current vs Temperature 6 +V COMMON MODE 125°C 4 2 0 –2 –55°C 25°C 125°C –4 –V COMMON MODE –6 –8 –0.
PAGE 6
LT1193 U W TYPICAL PERFOR A CE CHARACTERISTICS Open-Loop Voltage Gain vs Load Resistance 80 60 60 40 40 GAIN 20 20 0 VS = ±5V TA = 25°C RL = 1k –20 100k 0 15k 10k 5k –20 100M 1M 10M FREQUENCY (Hz) 80 VS = ±5V VO = ±3V TA = 25°C 100 LOAD RESISTANCE (Ω) 10 LT1193 • TPC11 60 65 60 GAIN BANDWIDTH PRODUCT 55 55 50 50 UNITY GAIN PHASE MARGIN 45 45 40 40 35 35 30 –50 –25 25 75 0 50 TEMPERATURE (°C) 100 100 70 30 125 AV = 10 1 AV = 2 0.1 0.01 0.
PAGE 7
LT1193 U W TYPICAL PERFOR A CE CHARACTERISTICS Output Voltage Step vs Settling Time, AV = 2 Slew Rate vs Temperature VS = ± 5V 900 3 TA = –55°C 800 4 OUTPUT VOLTAGE STEP (V) 5 – SLEW RATE SLEW RATE (V/µs) OUTPUT VOLTAGE SWING (V) Output Voltage Swing vs Load Resistance TA = 25°C 1 TA = 125°C –1 TA = 125°C –3 TA = –55°C, 25°C –5 10 100 LOAD RESISTANCE (Ω) 1000 700 600 +SLEW RATE 500 VS = ±5V 400 TA = 25°C RL = 1k VO = ±2V 300 –50 –25 0 25 50 75 TEMPERATURE (°C) LT1193 • TPC19 Larg
PAGE 8
LT1193 U W U U APPLICATIO S I FOR ATIO SHDN VIN 3 2 5 SHDN V+ 7 + – LT1193 1 +/REF 8 –/FB 4 6 VIN VOUT 3 2 5 7 + – LT1193 1 +/REF 8 –/FB 4 V– RFB RG VIN 3 2 VOUT VOUT 1V/DIV 0V 0V VOUT 10mV/DIV R + RG AV = – FB RG RG SHDN VINDIFF 6 V– RFB R + RG AV = + FB RG 5 Settling Time Poor Bypass V+ SHDN V+ 7 + – LT1193 1 +/REF 8 –/FB 4 6 VINDIFF VOUT VIN RG 3 2 5 V+ 7 + – LT1193 1 +/REF 8 –/FB 4 V– RFB LT1192 • TA05 6 SETTLING TIME TO 10mV, AV = 2 SUPPLY BYPASS CAPACITO
PAGE 9
LT1193 U W U U APPLICATIO S I FOR ATIO Small-Signal Transient Response Closed-Loop Voltage Gain vs Frequency CLOSED-LOOP VOLTAGE GAIN (dB) 25 VS = ±5V TA = 25°C AV = 10 AV = 5 15 AV = 3 AV = 2 5 –5 100k 1M 10M FREQUENCY (Hz) 100M LT1193 • TA10 AV = 2 WITH 8pF FEEDBACK CAPACITOR RISE TIME = 3.
PAGE 10
LT1193 U W U U APPLICATIO S I FOR ATIO termination is preferred because reflected energy is absorbed at each end of the cable. When using the double termination technique it is important to note that the signal is attenuated by a factor of 2, or 6dB. The cable driver has a – 3dB bandwidth of 80MHz while driving a 150Ω load. Using the Shutdown Feature The LT1193 has a unique feature that allows the amplifier to be shut down for conserving power or for multiplexing several amplifiers onto a common cable.
PAGE 11
LT1193 U W U U APPLICATIO S I FOR ATIO Murphy Circuits 5V 3 2 1 8 + – + – 5V 3 7 LT1193 6 2 COAX 1 8 4 + – + – –5V 5V 3 7 LT1193 2 6 1 4 8 1X SCOPE PROBE –5V + – + – 7 LT1193 6 4 –5V SCOPE PROBE LT1193 • TA13 An Unterminated Cable Is a Large Capacitive Load A 1X Scope Probe Is a Large Capacitive Load A Scope Probe on the Inverting Input Reduces Phase Margin W W SI PLIFIED SCHE ATIC 7 V+ VBIAS + 3 – 2 VBIAS CM C FF +V 6 VOUT +V * 4 V– 5 SHDN 1 +/REF 8 –/FB * SUB
PAGE 12
LT1193 U PACKAGE DESCRIPTIO J8 Package 8-Lead CERDIP (Narrow .300 Inch, Hermetic) .405 (10.287) MAX (Reference LTC DWG # 05-08-1110) .300 BSC (7.62 BSC) .200 (5.080) MAX CORNER LEADS OPTION (4 PLCS) .008 – .018 (0.203 – 0.457) .015 – .060 (0.381 – 1.524) .023 – .045 (0.584 – 1.143) HALF LEAD OPTION 0° – 15° .045 – .068 (1.143 – 1.650) FULL LEAD OPTION .005 (0.127) MIN 8 NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS .014 – .026 (0.360 – 0.660) 5 .025 (0.635) RAD TYP .