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AD8376ACPZ-WP 데이터시트(PDF) 8 Page - Analog Devices |
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AD8376ACPZ-WP 데이터시트(HTML) 8 Page - Analog Devices |
8 / 12 page AD8376 Preliminary Technical Data Rev PrD | Page 8 of 12 APPLICATION HIGH PERFORMANCE ADC DRIVING The AD8376 provides the gain, isolation, and balanced low distortion output levels for efficiently driving wideband ADCs such as the AD9445. Figure 9 represents a simplified front end of the AD8376 dual VGA driving two AD9445 14 Bit, 125MSPS A/D converters. For optimum performance the AD8376 is driven differentially from the input baluns. The input 37.5 Ω resistors in parallel with the 150 Ω input impedance of the AD8376 provide a 50 Ω differential input impedance. The open collector outputs of the AD8376’s are biased through the 1 uH inductors and are ac coupled from the 75 Ω load resistors which are required for gain accuracy. The 75 Ω load resistors are also ac coupled from the AD9445 to negate a DC affect on the input common mode voltage of the AD9445. The series 33 Ω resistors improve the SNR by providing isolation. The AD9445 represents a 1 kΩ differential load and requires a 2 Vp-p differential signal (VREF=1V) between VIN+ and VIN- for a full scale output. This circuit provides variable gain, isolation and source matching for the AD9445. Using this circuit with the AD8376 in a gain of 20 dB (Max Gain) an SFDR performance of 86 dBc is achieved at 100 MHz (see Figure 8). Figure 14. SFDR Performance of the AD8376 Driving the AD9445 Figure 15. AD8376 Driving the AD9445 |
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