Datasheet

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LT1252

Low Cost

Video Amplifier

ESCRIPTIO

■

RGB Cable Drivers

■

Composite Video Cable Drivers

■

Gain Blocks in IF Stages

ITY

Transient Response

LT1252 • TA02

OUT



620Ω



620Ω

75Ω

75Ω

CABLE

75Ω

–

LT1252

LT1252 • TA01

= 1 +



AT AMPLIFIER OUTPUT.

6dB LESS AT V

OUT

BW = 100MHz

–5V

= ±5V

= 2

= 150Ω

= 1V

■

Low Cost

■

Current Feedback Amplifier

■

Differential Gain: 0.01%, R

= 150Ω, V

= ±5V

■

Differential Phase: 0.09°, R

= 150Ω, V

= ±5V

■

Flat to 30MHz, 0.1dB

■

100MHz Bandwidth on ±5V

■

Wide Supply Range: ±2V(4V) to ±14V(28V)

■

Low Power: 85mW at ±5V

The LT1252 is a low cost current feedback amplifier for

video applications. The LT1252 is ideal for driving low

impedance loads such as cables and filters. The wide

bandwidth and high slew rate of this amplifier make

driving RGB signals between PCs and workstations easy.

The linearity of the LT1252 is outstanding; it is unsur-

passed for driving composite video.

The LT1252 is available in the 8-pin DIP and the S8 surface

mount package. For higher performance and shutdown

operation, see the LT1227. For dual and quad amplifiers

with similar performance see the LT1253/LT1254.

Summary of content (8 pages)

PAGE 1
LT1252 Low Cost Video Amplifier U DESCRIPTIO FEATURES ■ ■ ■ ■ ■ ■ ■ ■ Low Cost Current Feedback Amplifier Differential Gain: 0.01%, RL = 150Ω, VS = ±5V Differential Phase: 0.09°, RL = 150Ω, VS = ±5V Flat to 30MHz, 0.1dB 100MHz Bandwidth on ±5V Wide Supply Range: ±2V(4V) to ±14V(28V) Low Power: 85mW at ±5V UO APPLICATI ■ ■ The LT1252 is available in the 8-pin DIP and the S8 surface mount package. For higher performance and shutdown operation, see the LT1227.
PAGE 2
LT1252 W W W AXI U U ABSOLUTE RATI GS Total Supply Voltage (V + to V –) ............................. 28V Input Current ..................................................... ±15mA Output Short-Circuit Duration (Note 1) ........ Continuous Operating Temperature Range .................... 0°C to 70°C Storage Temperature Range ................ – 65°C to 150°C Junction Temperature (Note 2)............................ 150°C Lead Temperature (Soldering, 10 sec).................
PAGE 3
LT1252 ELECTRICAL CHARACTERISTICS 0°C ≤ TA ≤ 70°C, VS = ±5V to ±12V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS tr Small-Signal Rise Time VS = ±12V, AV = 2 3.5 ns Rise and Fall Time VS = ±5V, AV = 2, VOUT = 1VP-P 5.2 ns Propagation Delay VS = ±5V, AV = 2 3.5 ns tp Note 1: A heat sink may be required to keep the junction temperature below absolute maximum when the output is shorted indefinitely.
PAGE 4
LT1252 U W TYPICAL PERFOR A CE CHARACTERISTICS Input Common-Mode Limit vs Temperature 14 V+ 13 –0.5 COMMON-MODE RANGE (V) –55°C 10 25°C 9 8 125°C 7 175°C 6 V+ V + = 2V TO 12V –1.0 –1.5 –2.0 2.0 1.5 V – = –2V TO –12V 1.0 0.
PAGE 5
LT1252 U W TYPICAL PERFOR A CE CHARACTERISTICS ±12V Frequency Response ±5V Frequency Response 4 3 PHASE 0 –20 4 –20 –40 3 –60 2 –80 GAIN 0 –100 –40 PHASE –80 GAIN 0 –120 –120 –2 –140 –2 –160 –3 –180 –4 –200 –5 1M –4 –5 1M VS = ±12V AV = 1 RL = 150Ω RF = 2.37k 10M 100M FREQUENCY (Hz) 1G –140 VS = ±5V AV = 1 RL = 150Ω RF = 1.
PAGE 6
LT1252 U W TYPICAL PERFOR A CE CHARACTERISTICS Transient Response Transient Response VS = ±5V AV = 1 RL = 150Ω RF = 619Ω VO = 1V VS = ±5V AV = 10 RL = 150Ω LT1252 • TPC16 LT1252 • TPC17 RF = 619Ω RG = 68.1Ω VO = 1.5V U TYPICAL APPLICATIO S Single Supply AC-Coupled Amplifier Inverting Single Supply AC-Coupled Amplifier Noninverting 5V 5V 4.7µF 4.7µF + AV = 22µF + VIN 10k + 510Ω ≈ 10 RS + 51Ω 10k BW = 14Hz to 60MHz + 10k + + VOUT LT1252 2.
PAGE 7
LT1252 W W SI PLIFIED SCHE ATIC V+ –IN +IN VOUT V– LT1252 • SS U PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted. N8 Package 8-Lead Plastic DIP 0.300 – 0.320 (7.620 – 8.128) 0.045 – 0.065 (1.143 – 1.651) +0.025 0.325 –0.015 8.255 +0.635 –0.381 0.130 ± 0.005 (3.302 ± 0.127) 8 7 6 5 0.065 (1.651) TYP 0.009 – 0.015 (0.229 – 0.381) ( 0.400 (10.160) MAX 0.250 ± 0.010 (6.350 ± 0.254) 0.125 (3.175) MIN 0.045 ± 0.015 (1.143 ± 0.381) ) 0.100 ± 0.010 (2.540 ± 0.
PAGE 8
LT1252 U.S. Area Sales Offices NORTHEAST REGION Linear Technology Corporation One Oxford Valley 2300 E. Lincoln Hwy.,Suite 306 Langhorne, PA 19047 Phone: (215) 757-8578 FAX: (215) 757-5631 SOUTHEAST REGION Linear Technology Corporation 17060 Dallas Parkway Suite 208 Dallas, TX 75248 Phone: (214) 733-3071 FAX: (214) 380-5138 SOUTHWEST REGION Linear Technology Corporation 22141 Ventura Blvd.