Datasheet LT1227 (Analog Devices)

LT1227 140MHz Video Current Feedback Amplifier
U FEATURES DESCRIPTIO
■
140MHz Bandwidth: AV = 2, RL = 150
Ω The LT®1227 is a current feedback amplifier with wide ■
1100V/
µ
s Slew Rate
bandwidth and excellent video characteristics. The low ■ Low Cost differential gain and phase, wide bandwidth, and 30mA ■ 30mA Output Drive Current output drive current make the LT1227 well suited to drive ■ 0.01% Differential Gain cables in video systems. ■ 0.01° Differential Phase A shutdown feature switches the device into a high imped- ■ High Input Impedance: 14MΩ, 3pF ance, low current mode, allowing multiple devices to be ■ Wide Supply Range: ±2V to ±15V connected in parallel and selected. Input to output isola- ■ Shutdown Mode: IS < 250µA tion in shutdown is 70dB at 10MHz for input amplitudes up ■ Low Supply Current: IS = 10mA to 10VP-P. The shutdown pin interfaces to open collector ■ Inputs Common Mode to Within 1.5V of Supplies or open drain logic and takes only 4µs to enable or disable. ■ Outputs Swing Within 0.8V of Supplies
U
The LT1227 comes in the industry standard pinout and
APPLICATIO S
can upgrade the performance of many older products. For a dual or quad version, see the LT1229/1230 data sheet. ■ Video Amplifiers The LT1227 is manufactured on Linear Technology’s ■ Cable Drivers proprietary complementary bipolar process. ■ RGB Amplifiers ■ Test Equipment Amplifiers , LTC and LT are registered trademarks of Linear Technology Corporation. ■ 50Ω Buffers for Driving Mixers
U TYPICAL APPLICATIO Video Cable Driver Differential Gain and Phase vs Supply Voltage
0.20 0.20 VIN + NTSC COMPOSITE 75Ω f = 3.58MHz LT1227 0.16 0.16 DIFFERENTIAL GAIN (%) – 75Ω RF CABLE 0.12 0.12 1k VOUT 0.08 0.08 RG V 75Ω 1k OUT = 1 V ∆φ IN DIFFERENTIAL PHASE (DEG) 0.04 0.04 1227 TA01 ∆G 0 0 5 7 9 11 13 15 SUPPLY VOLTAGE (±V) LT1227 • TA02 1