●Product Details
●The AD8366 is a matched pair of fully differential, low noise and low distortion, digitally programmable variable gain amplifiers (VGAs). The gain of each amplifier can be programmed separately or simultaneously over a range of 4.5 dB to 20.25 dB in steps of 0.25 dB. The amplifier offers flat frequency performance from dc to 70 MHz, independent of gain code.
●The AD8366 offers excellent spurious-free dynamic range, suitable for driving high resolution analog-to-digital converters (ADCs). The NF at maximum gain is 11.4 dB at 10 MHz and increases ~2 dB for every 4 dB decrease in gain. Over the entire gain range, the HD3/HD2 are better than −90 dBc for 2 V p-p at the output at 10 MHz into 200 Ω. The two-tone intermodulation distortion of −90 dBc into 200 Ω translates to an OIP3 of 45 dBm (38 dBVrms). The differential input impedance of 200 Ω provides a well-defined termination. The differential output has a low impedance of ~25 Ω.
●The output common-mode voltage defaults to VPOS/2 but can be programmed via the VCMA and VCMB pins over a range of voltages. The input common-mode voltage also defaults to VPOS/2 but can be driven down to 1.5 V. A built-in, dc offset compensation loop can be used to eliminate dc offsets from prior stages in the signal chain. This loop can also be disabled if dc-coupled operation is desired.
●The digital interface allows for parallel or serial mode gain programming. The AD8366 operates from a 4.75 V to 5.25 V supply and consumes typically 180 mA. When disabled, the part consumes roughly 3 mA. The AD8366 is fabricated using Analog Devices, Inc., advanced silicon-germanium bipolar process, and it is available in a 32-lead exposed paddle LFCSP package. Performance is specified over the −40°C to +85°C temperature range.
●Applications
● Baseband I/Q receivers
● Diversity receivers
● Wideband ADC drivers
●### Features and Benefits
● Matched pair of differential, digitally controlled VGAs
● Gain range: 4.5 dB to 20.25 dB
● 0.25 dB gain step size
● Operating frequency
● DC to 150 MHz (2 V p-p)
● 3 dB bandwidth: 600 MHz
● Noise figure (NF)
● 11.4 dB at 10 MHz at maximum gain
● 18 dB at 10 MHz at minimum gain
● OIP3: 45 dBm at 10 MHz
● HD2/HD3
● Better than −90 dBc for 2 V p-p output at 10 MHz at maximum gain
● Differential input and output
● Adjustable output common-mode
● Optional dc output offset correction
● Serial/parallel mode gain control
● Power-down feature
● Single 5 V supply operation
Part 3D Model
