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Применения > > Low Noise, Low Distortion Single-Ended Input Drive Circuit for Differential Input IF Sampling ADCs

Low Noise, Low Distortion Single-Ended Input Drive Circuit for Differential Input IF Sampling ADCs (cn0171)

The circuit shown in Figure 1 uses the ADL5535/ ADL5536 single-ended IF low noise 50 Ω gain block to drive the AD9268 16-bit differential input analog-to-digital converter (ADC). The circuit includes an interstage bandpass filter for noise reduction and anti-aliasing. The use of a single-ended IF gain stage followed by a transformer to perform the single-ended- to-differential conversion is an optimum solution for this application where both low noise and low distortion are required.

The ADL5535/ADL5536 is a high linearity (third order output intercept, OIP3 = +45 dBm at 190 MHz), single-ended, fixed gain amplifier that can be used as a driver for high performance IF sampling of analog-to-digital converters. The ADL5535 has a gain of 16 dB and provides a simple approach to raise the signal from approximately 400 mV p-p to the 2 V p-p full-scale level required by the ADC. The ADL5535 low noise figure (3.2 dB at 190 MHz) and low distortion ensure that the ADC performance is not compromised. The ADL5536 can be used where a gain of 20 dB is required.

Figure 1. Schematic of the ADL5535 Driving the AD9268 16-Bit ADC, (Simplified Schematic: All Connections and Decoupling Not Shown)

Возможности

  • Single ended to differential conversion
  • 50 ohm impedance matched gain block
  • Matched filter provides noise reduction and antialiasing

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