高性能视频运算放大器 High Performance Video Op Amp
GENERAL DESCRIPTION
A wideband current feedback operational amplifier, the AD811 is optimized for broadcast-quality video systems. The −3 dB bandwidth of 120 MHz at a gain of +2 and the differential gain and phase of 0.01% and 0.01° RL = 150 Ω make the AD811 an excellent choice for all video systems. The AD811 is designed to meet a stringent 0.1 dB gain flatness specification to a band width of 35 MHz G = +2 in addition to low differential gain and phase errors. This performance is achieved whether driving one or two back-terminated 75 Ω cables, with a low power supply current of 16.5 mA. Furthermore, the AD811 is specified over a power supply range of ±4.5 V to ±18 V. Continued on page 3
FEATURES
High speed
140 MHz bandwidth 3 dB, G = +1
120 MHz bandwidth 3 dB, G = +2
35 MHz bandwidth 0.1 dB, G = +2
2500 V/µs slew rate
25 ns settling time to 0.1% for a 2 V step
65 ns settling time to 0.01% for a 10 V step
Excellent video performance RL =150 Ω
0.01% differential gain, 0.01° differential phase
Voltage noise of 1.9 nV/√Hz
Low distortion: THD = −74 dB @ 10 MHz
Excellent dc precision: 3 mV max input offset voltage
Flexible operation
Specified for ±5 V and ±15 V operation
±2.3 V output swing into a 75 Ω load VS = ±5 V
APPLICATIONS
Video crosspoint switchers, multimedia broadcast systems
HDTV compatible systems
Video line drivers, distribution amplifiers
ADC/DAC buffers
DC restoration circuits
Medical
Ultrasound
PET
Gamma
Counter applications
