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